CN110566290A - Application of metal wire metallurgical bonding porous material in manufacturing high-temperature-resistant mechanical parts - Google Patents

Abstract

The invention discloses the application of metallurgically bonded porous materials of metal wires in the manufacture of high-temperature resistant mechanical parts. Metal wire materials are gathered together, pressed to make the metal wires contact each other, and realize metallurgical bonding between the wires. Obtain a metal wire porous material with connected pores; process the metal wire porous material into a porous high temperature resistant mechanical part, and assemble it to the corresponding position in the mechanical structure; let the fluid enter the high temperature resistant mechanical part through the fluid channel, so that The fluid passes from the inner surface side of the porous high temperature mechanical parts to the outer surface of the porous high temperature mechanical parts through the pores of the porous high temperature mechanical parts, cools the high temperature mechanical parts, and forms a fluid on the outer surface of the high temperature mechanical parts The film prevents the heat flow from directly contacting the high-temperature-resistant mechanical parts, so that the high-temperature-resistant mechanical parts work at a lower temperature. The invention can improve the service life of the high-temperature-resistant mechanical parts in the high-temperature working environment.

Description

Application of wire metallurgy combined with porous materials in the manufacture of high temperature resistant mechanical parts

technical field

The invention relates to the technical field of metal porous materials applied to high-temperature-resistant mechanical parts, in particular to the application of a metallurgy-bonded porous material in the manufacture of high-temperature-resistant mechanical parts.

Background technique

The application number is CN201820308098, and the invention name is "working blade edge plate cooling structure". The Chinese utility model patent application of China Aviation Development Commercial Aviation Engine Co., Ltd. provides a working blade edge plate cooling structure, and the working blade includes the edge plate. An air film hole is provided on the top surface of the edge plate, a cooling channel is provided inside the edge plate, and one end of the cooling channel communicates with the side of the edge plate; a process plug is provided on the side of the edge plate, One end of the cooling channel communicates with the process plug, the process plug is blocked, and the cooling channel is a serpentine channel. The cooling structure of the edge plate of the working blade solves the problem of local overheating of the edge plate. The casting core is used to construct the cooling channel of the edge plate, and the cooling channel can be designed more freely. At the same time, the core removal problem of the internal cooling structure of the blade is improved through the process plug, and the air-filled film cooling of the serpentine edge plate cooling structure improves the cooling efficiency, and solves the local overheating problem of the blade edge plate under the condition of very little cooling air. The size of the cooling holes manufactured by the casting core method is millimeter-level, and the size is relatively large. The spacing between the holes should not be too small, otherwise the structural strength of the part will be weakened. The application number is CN201510362150, and the name of the invention is "a composite cooling structure for the wall surface of the flame tube of the aero-engine combustion chamber". , consisting of the base plate wall and the cover plate wall, 6 parallel fine-scale channel grooves are cut along the flow direction of the flame tube inside the base plate wall, and 6 small air outlet through holes are made on the center line of each cut micro-scale channel groove, and the cover plate wall Corresponding to each cutting micro-scale channel groove, there is a large air intake hole; the wall of the bottom plate and the wall of the cover plate are welded into one body, and after welding, bending treatment is carried out along the circumference of the flame tube, and thermal barrier coating is sprayed on the side wall of the bottom plate The combination of "micro-channel cooling" and "divergent hole film cooling" is adopted to make full use of the micro-scale structure to enhance heat transfer, so that the cooling capacity of the cooling airflow can be brought into play. The application number is CN201210297968, and the invention name is "the processing method of the flame tube, the wall plate and its cooling hole, and the combustion chamber of the gas turbine". The processing method of the cooling hole, the wall plate of the flame tube is provided with a plurality of cooling holes uniformly distributed along the direction of the flow line of the high-temperature gas flow and passing through the wall plate of the flame tube, so as to form an efficient and uniform cooling gas film on the wall of the flame tube and ensure The purpose of the gas film is not torn by high temperature gas. However, due to the use of impact mechanical processing methods to manufacture small holes, the size and spacing of small holes are limited. In fact, it is difficult to ensure the formation of a continuous and stable gas film layer, and it is also impossible to ensure that the gas film will not be torn by high-temperature gas, and the manufacturing cost is relatively high. High, large gas consumption.

The application number is CN201811371729, and the name of the invention is "a laser processing method for air film holes in high-pressure turbine guide vanes". In the field of aero-engine manufacturing, through automatic programming combined with manual jog teaching programming method, the theoretical coordinates are used to mark the surface of the part, and then the teaching and recording of the processing program is completed by manual jogging, which reduces the difference in the turbine blade casting surface and The influence of the movement error of the rotary axis of the machine tool on the position of the air film hole ensures the position accuracy of the air film hole in the hollow blade of the high-pressure turbine. The application number is CN201710846287, and the invention name is "a cooling hole, engine combustion chamber and cooling hole processing method". The Chinese invention patent application of China Aviation Development Commercial Aviation Engine Co., Ltd. provides a cooling hole, including the inner wall and the The inlet section, the expansion transition section, the expansion section and the cylindrical-like section between the outer walls, wherein the cylindrical-like section enlarges the outlet area of the cooling channel on the diverging wall, thereby improving the cooling effect of the cooling hole. In addition, the expansion transition section, expansion section and cylinder-like section are formed by translation of the circular cross section in the direction of the centerline of the inlet section (that is, the direction of the hole axis), so that when the cooling hole is processed by laser, the incident angle of the laser can remain unchanged. Therefore, the processing efficiency of laser processing can be significantly improved. The cooling holes produced by these two laser drilling methods are generally sub-millimeter in size, smaller in size and denser, but the number of holes is still limited, and the spacing between holes should not be too small, otherwise the structural strength of the part will be weakened. And the cost is high; the internal surface area of the pores is smaller than that of porous materials, and the heat dissipation and cooling effect is also small.

The application number is CN201410314322, and the title of the invention is "an advanced turbine cooling method based on porous media and supercritical state fluid circulation". The Chinese invention patent application of Beihang University provides a method based on porous media and supercritical state fluid circulation. The advanced turbine blade cooling method increases the effective heat exchange area by filling the cooling channel in the turbine blade with porous media material, and its effective heat exchange area depends on the shape, size and arrangement direction of the microscopic pore structure; The supercritical state fluid with strong heat exchange capacity is the heat exchange medium, which makes the actual heat exchange capacity of the turbine larger than the conventional heat exchange method; the number of cooling channels in the blisk and the ribs in the blade can be designed according to the actual heat exchange requirements The number of plates; the size, shape and arrangement direction of the pores of the porous medium can be designed according to the actual heat transfer requirements; the blades can be processed as a whole by laser rapid prototyping technology or other high-energy beam rapid prototyping technology. Its shortcoming is that the dense wall surface layer still adopts the conventional manufacturing method, and small holes are processed on the surface for the dense wall surface layer, and then filled with porous media material inside. The surface is not a porous material, and it is difficult to form a stable and continuous surface on the outer surface of the blade when it is working. air film layer.

The application number is CN200710177472, and the title of the invention is "heated wall cooling structure and gas turbine blade using the cooling structure". The Chinese invention patent application of Tsinghua University provides a heating wall cooling structure and a gas turbine blade using the cooling structure. It has a dense wall surface layer, and the dense wall surface layer has a plurality of discrete through holes for the coolant to pass through; the heated side of the dense wall surface layer is covered with a porous medium layer, so that the porous medium layer and the dense wall surface with multiple discrete through holes are The layers form a double-layer stacked structure, and the outlets of the discrete through-holes communicate with the porous medium layer. The disadvantage is that the dense wall layer is still made by conventional manufacturing methods, and then the porous medium layer is covered on the dense wall layer. The blade is in the shape of a curved surface, and the two materials must be firmly laminated together. The process is complicated, and the safety and reliability of the parts are reduced.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and proposes an application of a metallurgical bonded porous material of metal wire in the manufacture of high temperature resistant mechanical parts, directly processing the metallurgical bonded porous material of metal wire (also called metal fiber) Manufactured into high temperature resistant structural parts, the fluid passes through the porous material of the mechanical parts to cool the parts.

In order to achieve the above purpose, the technical solution provided by the present invention is: the application of metallurgical metallurgy combined with porous materials in the manufacture of high temperature resistant mechanical parts, first gather the metal wire materials together, press to make the metal wires contact each other, and Metallurgical bonding is achieved between the wires, and a porous metal wire material with interconnected pores is prepared; then the porous metal wire material is processed into a porous high-temperature-resistant mechanical part, and the porous high-temperature-resistant mechanical part is assembled into a corresponding mechanical structure. The position is fixed; then the fluid enters the interior of the high temperature resistant mechanical parts through the fluid channel, so that the fluid reaches the outer surface of the porous high temperature resistant mechanical parts from the inner surface side of the porous high temperature resistant mechanical parts through the pores of the porous high temperature resistant mechanical parts , cooling the high temperature mechanical parts, and forming a fluid film on the outer surface of the high temperature mechanical parts, preventing the direct contact of the heat flow to the high temperature mechanical parts, making the high temperature mechanical parts work at a lower temperature, and improving the high temperature mechanical parts. Service life under high temperature working environment.

Further, the method for achieving metallurgical bonding between the metal wires includes sintering or discharge welding.

Further, the porosity of the metal wire porous material ranges from 5% to 50%.

Further, the metal wire materials are gathered together, pressed to make the metal wires contact with each other, and the metallurgical bonding is realized between the wires, and the metal wire porous material with connected pores is prepared. The steps are: first, the metal long The wire is chopped into short metal fibers, and then the short metal fibers are placed in the mold to be evenly distributed, and then the short metal fibers in the mold are pressed, and the short metal fibers in the mold are pressed tightly so that the short metal fibers are in contact with each other to obtain Short metal wire fiber compacts are unloaded from the mold and then sintered to prepare porous metal wire materials.

Further, the metal wire materials are gathered together, pressed to make the metal wires contact with each other, and the metallurgical bonding is realized between the wires, so as to prepare a metal wire porous material with interconnected pores, the steps are: first, Weaving long metal wires into blocks, rods, plates or cylinders, and then pressing the long metal wire braids through plastic pressure processing, so that the metal wires are in close contact with each other to obtain metal filament fiber compacts, and then sintered and pressed The billet is prepared to obtain a block, rod or plate metal wire porous material.

Further, the metal wire materials are gathered together, pressed to make the metal wires contact with each other, and the metallurgical bonding is realized between the wires, and the metal wire porous material with interconnected pores is prepared. The steps are as follows: first, the long The metal wire is woven into a metal mesh, and then the metal filament mesh is stacked together, and then the metal filament mesh is pressed through plastic processing to make the metal filaments closely contact with each other to obtain a metal filament fiber compact, and then The sintered metal filament mesh is laminated with a green body to manufacture a metal filament porous material.

Further, the metal wire materials are gathered together, pressed to make the metal wires contact with each other, and the metallurgical bonding between the wires is achieved to prepare a metal wire porous material with interconnected pores. The steps are: first, the metal The wire is woven into a metal mesh tape material, and then the metal mesh cloth tape material is tightly rolled to form a layer-by-layer rolled blank body in which the outer layer material tightly wraps the inner layer material, and then the rolled blank is pressed through plastic processing body, and then sinter the coiled green body to produce a wire porous material.

Further, after uniformly distributing metal powder, ceramic powder or mixed powder between the wires and on the surface, the pore size of the material is adjusted by pressing and sintering.

Further, the metal wire is a high temperature resistant alloy wire.

Further, the high-temperature-resistant mechanical parts are engine blades, turbine disks, and inner walls of combustion chambers.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. The pore size of metal wire metallurgy combined with porous materials can reach micron level, small, dense and uniform, and it is very convenient to control the pore size during material preparation; the inner surface area of multi-microporous materials is large, and when gas passes through porous materials , the process is long, the heat exchange is sufficient, and the heat exchange efficiency is high, which can uniformly and effectively cool the parts working under high temperature conditions; at the same time, a stable gas film is formed on the surface of the parts, which prevents the combustion flame from touching the surface of the parts and reduces the risk of working under high temperature conditions. The surface temperature of the parts, thus significantly improving the service life of the parts.

2. The metal fiber porous material with metal fiber as raw material has many advantages: the large-scale production of fiber has mature technology, and most metals including heat-resistant alloys such as tungsten and zirconium can be made into wire/ Fiber, the matrix material with high strength and few defects can be easily obtained from wire, such as stainless steel wire, carbon steel wire, aluminum alloy wire, copper fiber wire, iron-chromium-aluminum fiber and titanium fiber wire, nickel alloy wire, etc. Alloy wire, the easy-to-obtain metal wire not only reduces the production cost of metal fiber wire porous materials, but also can be easily controlled to form various shapes required for the preparation of metal fiber wire porous materials. After being made into wire porous materials, it can be processed as quickly as ordinary metal Conveniently manufactured to fluid cool parts that operate under high temperature conditions.

3. Metal wire bundles can be used for weaving, with high efficiency and low cost; the method of integrating material preparation and forming can be used to form the shape of the part while preparing the metallurgical bonded porous material of the metal wire.

4. After sintering, the metal wire can be pressed again, and the pressing and sintering can be carried out many times; and it can be heat treated like ordinary metal. Nitriding and carburizing can penetrate and connect the pores to the inside of the material, and the corrosion resistance and mechanical properties of the material are greatly improved. , the comprehensive mechanical properties of the material.

5. Gas and liquid can be easily introduced through the fluid channel, gas cooling and liquid cooling are adopted, and the consumption of cooling medium is low.

6. It is convenient to manufacture large-sized wire metallurgically bonded porous materials, so it is possible to manufacture large-sized high-temperature resistant parts, such as turbine disks, combustion chamber walls, etc.

7. The pore size of the metal wire porous material can be changed in a wide range, the pore size can be from nanometer to millimeter, the material microstructure is uniform and repeatable, and the porosity size and distribution are easy to control when manufacturing porous materials. Fluid permeability is stable.

8. Porous high-temperature-resistant mechanical parts can be used in combustion chambers, guide chambers, turbine blades and turbine disks in modern aero-engines, and can also be used for components such as casings, rings, and tail nozzles; porous high-temperature-resistant materials are used in glass manufacturing Gas turbines, civil aero engines, etc. can also use porous high-temperature resistant materials to manufacture important parts.

9. It can be machined and wire-cut EDM and other electric processing like ordinary metal materials, and it is convenient to manufacture parts of various shapes and sizes required; EDM and electrolytic polishing can be used to unclog the surface pores caused by mechanical processing; Can be welded for easy installation.

10. The material of the parts can be evenly ventilated everywhere, which can achieve the purpose of uniform cooling and cooling.

11. The present invention has short manufacturing process, low cost of raw materials and total manufacturing, high efficiency, stable process, guaranteed performance and quality of materials, and easy realization of stable mass production.

Detailed ways

The present invention will be further described below in conjunction with specific examples.

Example 1

The application of the metallurgy-bonded porous material provided by this embodiment in the manufacture of high-temperature-resistant mechanical parts is as follows: firstly, the metal wire materials are gathered together, pressed to make the metal wires contact each other, and realize the Metallurgical combination to prepare porous metal wire materials with connected pores; then process the porous metal wire materials into porous high-temperature resistant mechanical parts, and assemble the porous high-temperature resistant mechanical parts to the corresponding positions in the mechanical structure to fix them; then Let the fluid enter the high temperature resistant mechanical parts through the fluid channel, make the fluid pass from the inner surface side of the porous high temperature resistant mechanical parts to the outer surface of the porous high temperature resistant mechanical parts through the pores of the porous high temperature resistant mechanical parts, and cool the high temperature resistant mechanical parts Parts, and form a fluid film on the outer surface of high-temperature-resistant mechanical parts to prevent heat flow from directly contacting high-temperature-resistant mechanical parts, so that high-temperature-resistant mechanical parts work at lower temperatures, and improve the performance of high-temperature-resistant mechanical parts in high-temperature working environments service life.

Among them, the metal wire materials are gathered together, pressed to make the metal wires contact each other, and the metallurgical bonding between the wires is achieved, and the metal wire porous material with connected pores is prepared. The process is as follows: first, the metal The filaments are chopped into short metal fibers, and then the short metal fibers are placed in the mold to distribute evenly, and then the short metal fibers in the mold are pressed, and the short metal fibers in the mold are pressed tightly so that the short metal fibers are in contact with each other Obtaining short metal wire fiber compacts, unloading the compacts from the mold and sintering the compacts to prepare a metal wire porous material.

In this embodiment, the application of the above-mentioned wire metallurgy combined with porous materials in the manufacture of high-temperature resistant mechanical parts, the specific cases are as follows:

Firstly, multiple high-temperature alloy long fiber wires with a wire diameter of 30 microns are made into a rope with a diameter of 0.8 mm through a rope making machine to cause plastic bending and distortion of the long metal fibers, and then through continuous wire feeding and multi-knife rotary chopping devices, The 304 (0Cr18Ni9) superalloy wire rope with a rope diameter of 0.8mm is chopped at a speed of 500r/min. After cutting, the combined chopped rope will automatically disperse and form short fibers with bending plastic deformation, and the length is between 10 and 15mm. The twisted fiber wire with a wire diameter of 30 μm is used as the raw material, and then the superalloy short fiber is placed in the mold to distribute evenly, and then the stainless steel short fiber in the mold is pressed, and the superalloy short fiber in the mold is pressed tightly to make the superalloy short. The fibers are contacted with each other to obtain short fiber compacts of high-temperature alloy wires. The compacts in the mold are unloaded, and then vacuum sintered at 1550°C for 2 hours, followed by nitriding and carburizing heat treatment. Nitrogen and carbon penetrate into the interior of the connected pore material. The anti-corrosion and mechanical properties of the material have been greatly improved, and a porous material of superalloy wire with a porosity of 35% has been prepared, and the tensile strength of the material is 380MPa.

Then, the prepared metal wire porous material is processed into aircraft engine blade parts by mechanical processing, electric discharge and other mechanical processing methods, and after electrolytic polishing is used to dredge the pores blocked by machining on the surface, it is installed on the aircraft engine turbine disc structure.

When working, the main shaft of the engine and the turbine disk rotate at high speed, and the compressed air enters the inner cavity of the blade from the air inlet through the air inlet, and then passes through the micropores of the metal wire porous material of the blade to reach the surface of the blade, and forms air on the surface of the blade. The air film can prevent the high-temperature heat flow in the engine from directly washing the surface of the blade, and play a role of heat insulation. When the gas passes through the micropores of the metal wire porous material of the blade, it fully contacts with the inner surface of the micropore of the metal wire porous material of the blade to perform heat exchange, and has a significant cooling effect on the blade.

Compared with the prior art, this embodiment has the following advantages and beneficial effects: After the long fibers are made into ropes by the rope making machine, they are cut into curved and twisted fiber filaments, which have the characteristics of bending and twisting composite deformation, and continue the high mechanical strength of the fiber filaments Characteristics, in the state of natural accumulation, they collude with each other, and the compact has high connection strength. After sintering, there are multiple metallurgical bonding points between the fiber filaments, and the metallurgical bonding is more reliable; after the short metal fibers are plastically bent and twisted, they are piled together. When the porosity is very large, it is possible to manufacture lightweight metal porous materials with a porosity of more than 95%. After pressing, the porosity and pore size become smaller, and the pore size can be controlled in the millimeter to nanometer size range; the pores of metal wire porous materials The porosity ranges from 5% to 90%, and the porosity of metal wire porous materials with connected pores used in high-temperature mechanical parts ranges from 5% to 50%; the pores of porous materials made of short fibers are also small and uniform, which can avoid gas vibration , to ensure a stable flow of gas.

Example 2

The difference from Example 1 is that in this example, 100 H13 steel wires with a diameter of 55 microns are used as a bundle, and the multi-bundle wires are braided into a thick rope with a diameter of 300 mm by a rope braiding machine, and then the braided A good thick rope with a diameter of 300 mm is sintered in a vacuum heating furnace, heated to 1250 degrees Celsius for two hours, so that metallurgical bonding between the wires is achieved, and H13 steel rods with long fibers and porosity are manufactured. Then carry out cold forging at room temperature to reduce the diameter of the material by 10%, increase the density of the material, reduce the size of the pores, and manufacture a porous metal wire material with a maximum characteristic size of pores of 50 microns and a porosity of 35%. Then the prepared wire porous material is machined into aircraft engine blade parts.

Compared with the prior art, this embodiment has the following advantages and beneficial effects: Since the material is obtained by weaving fibers, the fibers are mutually restrained and mutually restricted; the long-fiber porous metal material produced has continuous long fibers and has a high Excellent mechanical properties, high fatigue strength and impact resistance, as well as the stiffness of conventional volume materials, can be processed into aircraft engine blade parts like ordinary metal materials; when the diameter of the wire used is the same, the pores of the material formed after braiding and sintering are uniform ; The material attached to the surface of the wire through surface treatment is evenly distributed into the prepared material along with the wire, which can improve the mechanical properties of the material; it is easy to control the final size of the pores and the distribution of the pore size; the prepared pores are along the The weaving direction of the fiber is distributed, and it is made into a metal wire porous material aircraft engine blade, which has small gas penetration resistance and fast air permeability.

Example 3

The difference from Example 2 is that in this example, the thick rope with a diameter of 300 mm obtained in Example 2 is cut into a cylinder with a length of 500 mm, heated to 1250 degrees Celsius, and then the hot cylinder is placed in the extrusion cylinder , the diameter of the core rod is 50 mm, the diameter of the outlet is 290 mm, and it is extruded in a pipe extrusion die to manufacture a pipe with an outer diameter of 290 mm, a hole diameter of 50 mm, and a wall thickness of 120 mm. Due to the small extrusion deformation , the pores in the material will not be completely eliminated, the obtained tube material contains tiny pores, and then the prepared metal wire multi-porous tube material is machined into a turbine disk part with an annular inner cavity of an aircraft engine, and the metal wire is multi- The turbine disk of porous material is installed and fixed on the rotating shaft of the aircraft engine, and then the metal wire porous material blade is installed and fixed on the turbine disk; when the engine is working, compressed air is input into the annular cavity of the turbine disk through the pipeline, and the gas will flow from the annular cavity of the turbine disk The cavity passes through the metal wire porous material of the turbine disk to cool the turbine disk and form an air film on the surface of the turbine disk. The air film can prevent the high-temperature heat flow in the engine from directly scouring the surface of the turbine disk and play a role of heat insulation; at the same time, a part The gas will enter the inner cavity of the blade through the annular cavity of the turbine disk, and then pass through the metal wire porous material of the blade to cool the blade and form an air film on the surface of the blade. The air film can prevent the high-temperature heat flow in the engine from directly washing the surface of the blade.

It is also possible to weave long metal wires into blocks, rods, and plates, press, and sinter to prepare block, rod, and plate metal filament porous materials, and then prepare the obtained metal wire porous materials Machined into aircraft engine blades and turbine disc parts.

Example 4

In this embodiment, long superalloy wires are first woven into metal mesh, and then the metal filament mesh is stacked together, and then the metal filament mesh is pressed through plastic processing to make the metal wires closely contact each other to obtain a metal mesh. The filament fiber is compacted, and then the metal filament mesh is sintered to laminate the green body, and the metal filament porous material is manufactured, and the metal filament porous material is processed into a bearing. The specific steps are: first use 20 steel wires with a diameter of 80 microns to tightly weave a mesh belt cloth with a width of 500 mm, then cut the mesh cloth into sheets with a width of 150 mm and a width of 100 mm, and then place 600 pieces of such materials The length and width are aligned and pressed together so that the metal wires are in close contact with each other to obtain a metal filament fiber plate compact, and then the metal filament mesh cloth block blank is sintered to manufacture a metal filament porous material plate, and then pressed again to make it The metal filament porous material plate is further densified, secondary sintered, reheated, and finally the metal wire porous material plate is machined into aircraft engine blades and turbine disk parts.

Example 5

The difference between this embodiment and Embodiment 4 is: firstly, the metal wire is woven into a metal mesh tape, and then the metal mesh tape is tightly rolled to form a layer-by-layer wrapping of the outer layer material tightly covering the inner layer material. Then the rolled body is sintered to achieve metallurgical bonding between the materials; and then plastic processing (forging, extrusion, drawing or rolling, etc.) is used to reduce the voids in the material of the rolled body, After the required porosity is finally reached, the required porous metal structure material (which can be rod, pipe, profile, plate or block material) can be manufactured, and then manufactured into aircraft engine blades and turbines by machining Disc parts parts.

Example 6

The difference between this embodiment and Embodiment 4 is that: a high-temperature alloy wire material with a diameter of 35 microns is used to tightly weave a stainless steel metal mesh belt with a width of 1 meter through a braiding machine, and then one end of the stainless steel mesh belt is fixed on a wire with a diameter of 1 meter. On the 500mm mold steel round roll, the motor drive mechanism rotates the roll, and the stainless steel mesh belt is tightly wound and stacked on the roll, and the ends are kept aligned to form a layer-by-layer coated stainless steel in which the outer layer material tightly wraps the inner layer material The mesh belt cylinder is rolled and stacked; after the wall thickness of the cylinder blank reaches the required thickness of 10 mm, the stainless steel mesh belt is cut short and rolled against another roll to make the stainless steel mesh belt cylinder roll and stack the blank between layers. Close contact, then unload the stainless steel mesh belt coiled body from the roll, put it into a vacuum sintering furnace and heat it to 1350 degrees Celsius, keep it warm for two hours, sinter the stainless steel mesh belt coiled body, so that the mesh belt material layer and layer The metallurgical bonding between the space and the wire is realized; after sintering, the sintered stainless steel mesh belt coiled cylindrical green body is placed on the roll again, and the sintered cylindrical green body material is rolled again to make the green body material dense reduce the voids in the rolled green body material, and roll it multiple times until the porosity of 25% is finally obtained to obtain the required multi-microporous metal structural material cylindrical piece. In the preparation of the multi-microporous metal structural material At the same time, a cylindrical part is formed. The cylindrical inner wall of the aircraft engine combustion chamber is made into a double-layer structure. The inner layer uses a cylindrical piece of metal structural material with many micropores to form the surface of the inner wall of the combustion chamber. The outer layer is an ordinary dense non-porous metal cylindrical piece. The inner layer and the outer layer Concentrically nested, the inner diameter of the outer layer is 2 mm larger than the outer diameter of the inner layer of the microporous metal structural material cylinder, both ends are closed, and there is a gas-tight cavity with a thickness of 1 mm between the two layers, and compressed air passes through the pipe Input into the gas cavity between the two layers, the gas will pass through the metal wire porous material in the inner layer from the gas cavity between the two layers, cool the inner wall of the combustion chamber, and form a gas film on the surface of the inner wall of the combustion chamber. It can prevent the high-temperature heat flow in the engine from directly scouring the surface of the inner wall of the combustion chamber and play a role of heat insulation.

Example 7

The difference between this embodiment and Embodiment 1 is: after the short metal fiber wire material is placed in the mold, the short metal fiber wire is pressed between two electrodes, and the two electrodes are discharged at the same time, so that the materials in the mold are welded into a whole.

Example 8

The difference between this embodiment and Example 5 is that after the multi-microporous sheet is manufactured, the multi-microporous sheet is formed into a blade shell with an inner cavity by a mold, and the overlapping edges are welded. The obtained material is multi-microporous Porous, air-permeable leaves over their entire surface.

Example 9

The difference between this embodiment and the embodiment 1 is that the high-temperature alloy wire short fibers are uniformly mixed with the high-temperature alloy powder, pressed and sintered to obtain a multi-microporous air-permeable high-temperature alloy material, and then the aircraft engine blade and turbine disk parts are obtained by machining; When the engine is working, the gas enters the inner cavity of the blades and turbine disks, and then passes through the materials of the blades and turbine disks, cools the blades and turbine disks, and forms an air film on their surfaces, preventing the high-temperature heat flow in the engine from directly washing the blades and turbine disks. On the surface, the air film plays the role of heat insulation.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all changes made according to the shape and principles of the present invention should be covered within the protection scope of the present invention.

Claims (10)

1. The application of metallic wire metallurgy combined with porous materials in the manufacture of high-temperature-resistant mechanical parts, characterized in that: first, the metal wire materials are gathered together, pressed to make the metal wires contact each other, and the metallurgical bonding between the wires is realized , to prepare a metal wire porous material with connected pores; then process the metal wire porous material into a porous high temperature resistant mechanical part, and assemble the porous high temperature resistant mechanical part to the corresponding position in the mechanical structure; then make the fluid Through the fluid channel, it enters the interior of the high-temperature-resistant mechanical parts, so that the fluid passes from the inner surface side of the porous high-temperature-resistant mechanical parts to the outer surface of the porous high-temperature-resistant mechanical parts through the pores of the porous high-temperature-resistant mechanical parts, cooling the high-temperature resistant mechanical parts, And form a fluid film on the outer surface of high-temperature-resistant mechanical parts to prevent heat flow from directly contacting high-temperature-resistant mechanical parts, make high-temperature-resistant mechanical parts work at low temperatures, and improve the service life of high-temperature-resistant mechanical parts in high-temperature working environments. 2. The application of the metallurgically bonded porous material of metal wire in the manufacture of high temperature resistant mechanical parts according to claim 1, characterized in that: the metallurgical bond between the metal wire materials includes sintering or discharge welding. 3. The application of the metallurgically bonded porous material of metal wire in the manufacture of high temperature resistant mechanical parts according to claim 1, characterized in that: the porosity of the porous metal wire material ranges from 5% to 50%. 4. The application of the metallurgy-bonded porous material of metal wire according to claim 1 in the manufacture of high temperature resistant mechanical parts, characterized in that: the metal wire materials are gathered together, pressed to make the metal wires contact each other, and make the wires Metallurgical bonding is achieved between them, and the metal wire porous material with interconnected pores is prepared. The steps are: first, the metal filaments are chopped into short metal fibers, and then the short metal fibers are placed in the mold to distribute them evenly, and then pressed into the mold The short metal fibers in the mold are compacted so that the short metal fibers are in contact with each other to obtain a short metal fiber compact, and the compact is unloaded from the mold and then sintered to prepare a multi- porous material. 5. The application of metal wire metallurgy combined with porous materials in the manufacture of high temperature resistant mechanical parts according to claim 1, characterized in that: the metal wire materials are gathered together, pressed to make the metal wires contact each other, and make the wires Metallurgical bonding is achieved between them, and the metal wire porous material with interconnected pores is prepared. The steps are: first, weave the long metal wire into a block, rod, plate or cylinder, and then pass the long metal wire braid through Plastic pressure processing and pressing, so that the metal wires are in close contact with each other to obtain a metal filament fiber compact, and then sintering the compact to prepare a block, rod or plate metal wire porous material. 6. The application of the metallurgy-bonded porous material of metal wire in the manufacture of high-temperature-resistant mechanical parts according to claim 1, characterized in that: the metal wire materials are gathered together, pressed to make the metal wires contact each other, and make the wires Metallurgical bonding is achieved between them, and a metal wire porous material with interconnected pores is prepared. The steps are: first, weave the long metal wire into a metal mesh cloth, then stack the metal filament mesh cloth together, and then press it through plastic processing The metal filament mesh is laminated on the green body, so that the metal wires are in close contact with each other to obtain a metal filament fiber compact, and then the metal filament mesh is stacked on the green body to manufacture a metal filament porous material. 7. The application of the metallurgy-bonded porous material of metal wire in the manufacture of high temperature resistant mechanical parts according to claim 1, characterized in that: the metal wire materials are gathered together, pressed to make the metal wires contact each other, and make the wires The metallurgical combination is achieved between them, and the metal wire porous material with interconnected pores is prepared. The steps are as follows: first, the metal wire is woven into a metal mesh tape, and then the metal wire mesh tape is tightly rolled to form an outer layer The layer-by-layer wrapping green body of the inner layer material is tightly covered by the material, and then the rolled green body is pressed by plastic processing, and then the rolled green body is sintered to manufacture a porous metal wire material. 8. The application of the metallurgically bonded porous material of wire according to claim 1 in the manufacture of high-temperature-resistant mechanical parts, characterized in that: metal powder, ceramic powder or mixed powder is evenly distributed between the wires and on the surface, and then pressed and sintered to adjust The size of the material pore size. 9. The application of the metallurgically bonded porous material of metal wire in the manufacture of high temperature resistant mechanical parts according to any one of claims 1 to 8, characterized in that: the metal wire is a high temperature resistant alloy wire. 10. The application of the wire metallurgy bonded porous material in the manufacture of high temperature resistant mechanical parts according to claim 1, characterized in that: the high temperature resistant mechanical parts are engine blades, turbine disks or inner walls of combustion chambers.