CN118996319A - Multi-high energy beam preparation method of particle reinforced molybdenum-based composite coating - Google Patents
Multi-high energy beam preparation method of particle reinforced molybdenum-based composite coating Download PDFInfo
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- 238000000576 coating method Methods 0.000 title claims abstract description 117
- 239000011248 coating agent Substances 0.000 title claims abstract description 111
- 239000002245 particle Substances 0.000 title claims abstract description 67
- 239000002131 composite material Substances 0.000 title claims abstract description 63
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000011733 molybdenum Substances 0.000 title claims abstract description 54
- 229910052750 molybdenum Inorganic materials 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims description 45
- 239000000463 material Substances 0.000 claims description 41
- 238000005507 spraying Methods 0.000 claims description 25
- 238000007750 plasma spraying Methods 0.000 claims description 20
- 239000007921 spray Substances 0.000 claims description 20
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- YXTPWUNVHCYOSP-UHFFFAOYSA-N bis($l^{2}-silanylidene)molybdenum Chemical compound [Si]=[Mo]=[Si] YXTPWUNVHCYOSP-UHFFFAOYSA-N 0.000 claims description 10
- 229910021343 molybdenum disilicide Inorganic materials 0.000 claims description 10
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 9
- 238000005488 sandblasting Methods 0.000 claims description 8
- 238000005485 electric heating Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 claims description 2
- 229910039444 MoC Inorganic materials 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims 6
- 239000003082 abrasive agent Substances 0.000 claims 1
- 239000003721 gunpowder Substances 0.000 claims 1
- 238000005137 deposition process Methods 0.000 abstract description 3
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 2
- 239000010962 carbon steel Substances 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 description 13
- 239000000758 substrate Substances 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 12
- 239000011159 matrix material Substances 0.000 description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 11
- 238000000151 deposition Methods 0.000 description 9
- 230000008021 deposition Effects 0.000 description 7
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- 238000002844 melting Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 229910016006 MoSi Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000012779 reinforcing material Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
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- 230000002195 synergetic effect Effects 0.000 description 2
- 241000132521 Erigeron Species 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
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- 230000008878 coupling Effects 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000001755 magnetron sputter deposition Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/142—Thermal or thermo-mechanical treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a multi-high energy beam preparation method of a particle reinforced molybdenum-based composite coating, which is characterized in that high energy laser beams are synchronously introduced in the high energy plasma flame flow particle deposition process, and the energy inside the coating is reasonably distributed in the particle deposition process by adjusting the positions of the high energy laser beams and high energy plasma jet flow; the coating prepared by the composite process has higher hardness, excellent wear resistance and good interface bonding state, and can be applied to a mechanical component protection layer, so that the service life of parts can be prolonged, and the application field of carbon steel mechanical parts can be widened.
Description
Technical Field
The invention belongs to the technical field of preparation of surface coatings, and relates to a multi-high energy beam preparation method of a particle reinforced molybdenum-based composite coating. Compared with the traditional method, the introduction mode of the reinforcing material in the composite coating prepared by the method has obvious advantages in the aspects of enhancing the dispersibility of the particle material and the coating performance.
Background
The refractory metal molybdenum has the characteristics of low thermal expansion coefficient, good electric conductivity and thermal conductivity, good corrosion resistance and good high-temperature creep property. Molybdenum is considered an excellent coating material suitable for applications requiring high strength and rigidity at high temperatures up to 1500 ℃. Molybdenum coatings have low friction and excellent wear resistance under sliding contact conditions, 2-18 times better wear resistance than uncoated hardened steel, molybdenum and molybdenum alloy powders have been investigated as coating materials for automotive parts, such as synchronizer rings, cylinder bores and piston rings. For decades, techniques for preparing molybdenum or molybdenum-based alloy coatings have been filling cementation, chemical vapor deposition, magnetron sputtering, supersonic flame spraying, and the like. These techniques all have certain advantages, but the performance requirements of the current molybdenum coating under the complex service environment are gradually not met. Plasma spraying is considered to be a versatile technique for processing a variety of coating materials including refractory materials, wear resistant materials, corrosion resistant materials, and the like. The preparation process is simpler, more convenient and more efficient, and compared with most other coating deposition technologies, the operation cost is lower, and the preparation method is an economic and efficient preparation method for the protective coating, so that the plasma spraying technology becomes one of the most common technologies in the preparation of the molybdenum coating.
The plasma spraying technology has the characteristics of simple and convenient operation, high efficiency and low cost, but the bonding force and compactness of the coating are poor due to the layered overlapping deposition mode of the coating, and the coating is easy to fail and fall after being used for a period of time. In addition, plasma sprayed Mo coatings have insufficient wear resistance to meet current machine part use requirements, and so researchers have been working to develop methods for improving the performance of molybdenum coatings, including: optimizing the spraying process parameters to improve the microstructure and performance of the coating; introducing reinforcing materials to improve the texture of the coating, thereby increasing its hardness and abrasion resistance; and various post-treatment techniques, such as laser remelting, etc., are employed to further enhance the bond strength and corrosion resistance of the coating.
Currently, a multi-energy field/multi-process composite preparation method is an effective way for improving the performance of products. By realizing the regulation and control of the coupling effect between the energy fields and the coupling parameters thereof, the improvement of the comprehensive effect is promoted, and the linear superposition of the single process effect is surpassed, namely, the synergistic effect of 1+1>2 is realized. The effect breaks the limitation of the traditional single preparation process on the processing limit, simplifies the complexity of post-treatment processing, and remarkably improves the efficiency, quality and performance of the material processing process.
The invention provides an innovative multi-high energy beam deposition molybdenum-based composite coating technology, which prepares a high-quality molybdenum-based composite coating by a novel reinforcing material introduction mode. The technology realizes the coating deposition on the surface of the carbon steel matrix through the synchronous action of the high-energy laser beam and the high-energy plasma jet. The process adopts a composite powder feeding mechanism of a laser and a plasma spray gun, realizes the full melting and mixing of reinforced particle materials with different melting points and Mo-based powder, ensures the uniform distribution of the reinforced particles in the coating, and obviously improves the comprehensive performance of the coating. In addition, the synergistic effect of multiple high energy beams not only optimizes the interface combination of the powder and the matrix and enhances the bonding strength between the coating and the matrix, but also improves the microstructure of the coating and improves the wear resistance, corrosion resistance and other key performance indexes of the coating. The innovative application of the technology effectively overcomes the limitation of the molybdenum-based coating in the aspects of wear resistance and bonding strength with a matrix in the traditional spraying technology, and meets the urgent requirements of the mechanical engineering field on the high-performance surface coating.
Disclosure of Invention
The invention aims to develop an innovative technology for depositing particle-reinforced molybdenum-based composite coating by multiple high energy beams. The technology realizes uniform melting and mixing of the coating by a novel introduction mode of the reinforcing material, optimizes the microstructure and interface bonding characteristic of the coating, and thereby remarkably improves the mechanical property and the wear resistance of the coating.
The invention creatively provides a preparation method of the mechanical component protective layer with the composite function, which can prolong the service life of parts and provides a new research direction and application potential for the development of surface coating technology.
The technical scheme of the invention is as follows:
a method for preparing a multi-high energy beam of a particle-reinforced molybdenum-based composite coating, comprising:
(a) Drying Mo powder and particle reinforced material powder for later use;
the particle reinforced material is selected from any one of titanium nitride, aluminum oxide, molybdenum disilicide, molybdenum carbide and the like;
Specifically, mo powder and particle reinforced material powder can be placed in an electric heating furnace at 100 ℃ for 2 hours to be subjected to drying and dehumidification, so that the powder fluidity is enhanced;
(b) Cleaning a workpiece to be sprayed, and performing sand blasting roughening treatment for later use;
specifically, the surface of the workpiece can be sandblasted and roughened by adopting an alumina abrasive, so that the roughness of the sprayed surface reaches Ra 8-10, and then the subsequent spraying is carried out;
(c) Setting up a laser composite plasma flame flow multi-energy beam spraying device by combining plasma spraying equipment and a laser manufacturing system, compositing a plasma spray gun with a laser by-pass, enabling the action center of the plasma spray gun and the action point of a light spot of the laser on the surface of a workpiece to be sprayed to coincide, enabling the plasma spray gun to mainly send Mo powder and the laser to assist in sending particle reinforced material powder, and synchronously utilizing a high-energy laser beam to realize injection of reinforced particle materials in the process of realizing Mo spraying by high-energy plasma jet so as to fully mix reinforced particles with a molybdenum-based coating and obtain a particle reinforced molybdenum-based composite coating;
in specific operation, the plasma spray gun is vertical to the surface of a workpiece, the composite angle (inclined included angle) between the laser and the plasma spray gun is 30-60 degrees (see figure 5), and the laser beam flow and the plasma flame flow synchronously act at the same action point of the workpiece to be sprayed;
The process parameters for the preparation of the coating are as follows: plasma spraying power is 15-30 kW, spraying distance is 50-200 mm, scanning speed is 50-200 mm/s, powder feeding amount of a plasma spray gun is 5-60 g/min, laser power is 1000-3000W, laser coaxial powder feeding amount is 5-40 g/min, main gas argon flow is 20-70L/min, and secondary gas hydrogen flow is 1-6L/min;
In the process, the powder feeding mode during laser composite plasma flame flow multi-energy beam deposition is a composite powder feeding mode, and the particle reinforced material is introduced through the composite powder feeding mode. Wherein, the plasma spraying spray gun sends pure molybdenum powder, and the laser coaxially sends particle reinforced material powder; when the composite coating is deposited by the laser composite plasma flame flow and high energy beams, the powder feeding quantity ratio of the laser to the plasma spray gun, namely the powder feeding speed ratio, is strictly controlled; when the composite coating is deposited by the laser composite plasma flame flow multi-energy beam, the content of the particle reinforced material in the molybdenum-based composite coating can be controlled by controlling the powder feeding amount ratio of the pure molybdenum material and the particle reinforced material in the spraying process.
Compared with the prior art, the invention has the beneficial effects that:
In the invention, the high-energy laser beam and the high-energy plasma jet flow synchronously act on the processing mode of the spraying material and the matrix, so that the reinforced particle materials with different melting points and the Mo powder are melted and mixed more fully in the deposition process, and the surface of the substrate can be melted to form a micro-melting pool, and the reinforced particle materials can be uniformly distributed in the molybdenum-based coating, thereby strengthening the performance of the coating. The Mo-based coating is also sufficiently melted and brought into contact with the substrate surface to form a near liquid-liquid interface, resulting in a tighter bond between the coating and the substrate, forming a micro-metallurgical bond, and significantly improving the bond strength.
Under the combined action of high-energy laser beams and high-energy plasma jet, most of spray particles are completely melted, under the acceleration and atomization of plasma spray airflow and the impact of high-energy laser beams, molten particles are diffused and fused with the surface of a micro-melting matrix, a spray material is gradually deposited to obtain a particle reinforced molybdenum-based composite coating, reinforced particle materials are uniformly distributed in the coating, few semi-molten or unmelted particles exist, the coating is very compact in structure, few in pores and cracks, and the microhardness is greatly improved.
The plasma spraying Mo coating has the main abrasion mechanisms of plastic deformation and adhesive abrasion, the surface hardness of the Mo coating is not high, splashing delamination, pits, local plastic deformation and cracks are easy to occur on the surface of the coating during abrasion, the reinforced particle material added in the particle reinforced Mo-based composite coating prepared by the invention improves the surface hardness of the coating, the coating tissue structure is more compact, the adhesive abrasion is reduced, and the friction coefficient and the abrasion rate of the Mo-based coating are effectively reduced by adding the reinforced particle material. The wear resistance of the particle reinforced molybdenum-based composite coating prepared by the method is far higher than that of a molybdenum coating prepared by plasma spraying, so that powerful support is provided for protecting mechanical components in a severe service environment, the service life of mechanical equipment is prolonged, and the application range of the mechanical equipment is widened.
Drawings
Fig. 1: the cross-sectional shape of the plasma sprayed molybdenum coating.
Fig. 2: the multi-high energy beam deposited alumina particles enhance the cross-sectional morphology of the molybdenum-based composite coating.
Fig. 3: SEM pictures of the wear surface of the plasma sprayed molybdenum coating.
Fig. 4: SEM pictures of wear surfaces of multi-high energy beam deposited alumina particle reinforced molybdenum-based composite coatings.
Fig. 5: schematic process diagram of multi-high energy beam deposition particle reinforced molybdenum-based composite coating.
Detailed Description
The present invention is further described below by way of specific examples, but the scope of the present invention is not limited thereto.
In the following examples, the base material was 316L stainless steel, supplied by Shanghai mountain Seisakusho Special Steel Co., ltd, and the sample size for the experiment was 20 mm. Times.20 mm. Times.6 mm.
The main material of the experimental spraying is molybdenum (Mo) powder, the purity of which is more than or equal to 99.9 percent, the granularity range is 15-45 mu m, and the main material is provided by Changsha Zhongxing stock Co-Ltd; the particle reinforced materials are respectively: alumina particles (Al 2O3): the purity is more than or equal to 99.3 percent, the granularity is 53-75 mu m, and the product is produced by Tianjin chemical reagent Co., ltd; titanium nitride particles (TiN): the purity is more than or equal to 99.3 percent, the granularity is 53-75 mu m, and the product is produced by Hunan Guangyuan hard materials limited company; molybdenum disilicide particles (MoSi 2): the purity is more than or equal to 99.5%, the granularity is 53-75 μm, and the product is produced by Zhengzhou fleabane electric heating element Co.
Example 1
(1) Before spraying, mo powder and alumina particles are placed in an electric heating furnace at 100 ℃ for 2 hours, so that the Mo powder and the alumina particles are dried and dehumidified, and the powder fluidity is enhanced.
(2) Dipping the surface of the substrate with absolute ethyl alcohol or acetone by using a steel wire brush, removing stains, rust spots and oxide scales on the surface of the substrate, and cleaning the surface of the substrate; and (3) carrying out sand blasting coarsening on the surface of the matrix to ensure that the roughness of the surface of the base material after sand blasting reaches Ra 8-10.
(3) Selecting technological parameters: laser power 1.6kW, plasma spraying gun output voltage 70V, output current 500A, spraying power 30kW, argon flow 50L/min, hydrogen flow 6.5L/min, mo powder feeding speed 56g/min, alumina particle feeding speed 24g/min, scanning speed 50mm/s and spraying distance 120mm. Setting selected technological parameters, fixing a workpiece to be sprayed, and carrying out multi-high energy beam synchronous action deposition on the surface of the workpiece to be sprayed to obtain the Al 2O3 particle reinforced Mo-based composite coating.
The microstructure morphology of the cross section of the alumina particle reinforced molybdenum-based composite coating is shown in figure 2, the structure of the molybdenum-based composite coating is denser than that of a plasma spraying molybdenum coating, the boundary between the coating and a matrix is no longer obvious, and the coating material and the surface material of the matrix are mutually combined to form a micro-metallurgical bonding mode; it can be observed that the porosity and unmelted particles in the coating are reduced and that the unmelted reinforcing particulate material is distributed more uniformly. The microhardness of the molybdenum-based composite coating is significantly improved due to the compact tissue structure of the coating and the characteristics of the particle reinforced material. Wear tests were performed under 30N load, and the morphology changes of the wear surfaces of the Mo coating and the alumina particle reinforced molybdenum-based composite coating are shown in fig. 3 and 4, and the wear surfaces of the Mo coating exhibit typical flaking, brittle fracture and local plastic deformation, while the wear surfaces of the Al 2O3 -Mo composite coating are slightly different. Under the same abrasion test condition, the width and depth of the abrasion trace of the Al 2O3 -Mo composite coating are smaller than those of the abrasion surface of the Mo coating, which shows that the abrasion resistance and abrasion resistance of the alumina particle reinforced molybdenum-based composite coating are better than those of the traditional plasma spraying Mo coating. Under the load of 30N, the wear rate of the Al 2O3 -Mo composite coating is reduced by 17 percent relative to that of the plasma spraying Mo coating, and the steady-state friction coefficient of the composite coating is reduced by 20 percent. When the abrasion test temperature is increased, the abrasion resistance of the alumina particle reinforced molybdenum-based composite coating is further improved relative to that of a plasma spraying Mo coating, which shows that the composite coating still has good performance under the high-temperature condition.
Example 2
(1) Before spraying, mo powder and titanium nitride particles are placed in an electric heating furnace at 100 ℃ for 2 hours, so that the Mo powder and the titanium nitride particles are dried and dehumidified, and the powder spraying fluidity is enhanced.
(2) Dipping the surface of the substrate with absolute ethyl alcohol or acetone by using a steel wire brush, removing stains, rust spots and oxide scales on the surface of the substrate, and cleaning the surface of the substrate; and (3) carrying out sand blasting coarsening on the surface of the matrix to ensure that the roughness of the surface of the base material after sand blasting reaches Ra 8-10.
(3) Selecting technological parameters: the laser power is 2.5kW, the output voltage of the plasma spraying gun is 70V, the output current is 500A, the spraying power is 30kW, the argon flow is 50L/min, the hydrogen flow is 5L/min, the Mo powder feeding speed is 40g/min, the titanium nitride powder particle speed is 10g/min, the scanning speed is 50mm/s, and the spraying distance is 120mm. Setting selected technological parameters, fixing a workpiece to be sprayed, and depositing the surface of the workpiece to be sprayed to prepare the TiN particle reinforced Mo-based composite coating.
The method for preparing the titanium nitride particle reinforced molybdenum-based composite coating in the example is the same as that in the example 1, the bonding mode of the coating and the matrix is metallurgical bonding, and the structure is compact, wherein the difference is that: the TiN content of the prepared TiN-Mo composite coating is 20% by adopting a laser with different powder feeding speed ratio corresponding to a plasma spray gun. Friction and wear experiments prove that the friction and wear resistance of the titanium nitride particle reinforced molybdenum-based composite coating is better than that of the traditional plasma spraying pure molybdenum coating. Under the load of 30N, the wear rate of the TiN-Mo composite coating is reduced by 37 percent relative to that of a plasma spraying Mo coating, and the steady-state friction coefficient of the titanium nitride particle reinforced molybdenum-based composite coating is reduced by 30 percent.
Example 3
(1) Before spraying, mo powder and molybdenum disilicide particles are placed in an electric heating furnace at 100 ℃ for 2 hours, so that the Mo powder and the molybdenum disilicide particles are dried and dehumidified, and the powder spraying fluidity is enhanced.
(2) Dipping the surface of the substrate with absolute ethyl alcohol or acetone by using a steel wire brush, removing stains, rust spots and oxide scales on the surface of the substrate, and cleaning the surface of the substrate; and (3) carrying out sand blasting coarsening on the surface of the matrix to ensure that the roughness of the surface of the base material after sand blasting reaches Ra 8-10.
(3) Selecting technological parameters: laser power 1.5kW, plasma spraying gun output voltage 70V, output current 500A, spraying power 30kW, argon flow 50L/min, hydrogen flow 5L/min, mo powder feeding speed 35g/min, molybdenum disilicide particle speed 15g/min, scanning speed 50mm/s and spraying distance 120mm. And setting selected technological parameters, fixing the workpiece to be sprayed, and spraying the surface of the workpiece to be sprayed to obtain the MoSi 2 particle reinforced Mo-based composite coating.
The molybdenum disilicide particle reinforced molybdenum-based composite coating prepared in this example 3 is the same as the method in example 1, the coating and the substrate are metallurgically bonded, and the structure is dense, wherein the difference is that: the proportion of the powder feeding speed corresponding to the laser and the plasma spray gun is higher, and the molybdenum disilicide content of the MoSi 2 -Mo composite coating is 30%. The friction and wear experiments prove that the friction and wear resistance of the molybdenum disilicide particle reinforced molybdenum-based composite coating is higher than that of the traditional plasma thermal spraying molybdenum coating, the wear rate of the MoSi 2 -Mo composite coating is reduced by 37% relative to that of the plasma spraying Mo coating under the load of 30N, and the steady-state friction coefficient of the molybdenum disilicide particle reinforced molybdenum-based composite coating is reduced by 31%.
The invention is not a matter of the known technology. The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
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