CN107151777A - The hot-spraying coating manufacturing process that sprayed on material is implemented in combination with bombardment particle phase - Google Patents

Abstract

The invention discloses a thermal spraying coating forming method realized by combining spraying materials and bombardment particles, which includes: spraying materials are heated to a molten or completely melted state by a spraying heat source, accelerated and propelled by a gas jet, and hit the surface of a substrate or deposited At the same time, the bombardment particles with elastic-plastic strain energy bombard the flattened deposited coating under the action of the same gas jet or a separate gas jet, and part or all of the collision with the coating rebounds and dissipates. Wherein: the heating temperature before the bombardment particles bombard the coating is lower than its melting point. The present invention solves the problems of large residual tensile stress and poor coating quality of existing thermal spray coatings through a simple, effective and low-cost method, improves the distribution of residual stress inside the coating, and does not affect the deposition effect of sprayed materials, and further Produce coating performance strengthening effect, improve the intrinsic performance and performance of the coating.

Description

Thermal Spray Coating Forming Method Realized by Combining Spraying Materials and Bombardment Particles

technical field

The invention relates to a thermal spraying coating forming method realized by combining spraying materials and bombardment particles, and belongs to the technical field of thermal spraying.

Background technique

Thermal spraying is a process in which a large number of heated, melted or molten particles fly at high speed and deposit on the surface of the substrate to form a coating. The application of thermal spraying has involved many industrial fields such as aviation, automobile, metallurgy, printing, chemical industry, etc., and has gradually become a key technology in equipment remanufacturing engineering and has been continuously explored.

The current research has found that the quenching stress formed by the instant solidification of the hot sprayed particles flattened and deposited on the surface of the substrate is the main source of residual stress in the coating, and it is unavoidable. It is precisely due to the existence of quenching stress in the coating that the final residual stress of the sprayed coating of most materials generally presents tensile stress, which will have extremely adverse effects on the bonding strength, thermal shock, wear and fatigue properties of the coating. It is easy to induce warping deformation, peeling, and even cracking and other failure behaviors during the spraying process and subsequent use. Therefore, it is an important task in the field of thermal spraying technology to actively explore effective countermeasures against the adverse effects of residual tensile stress in coatings.

In addition to the quenching stress, the residual stress source of the thermal spray coating usually includes thermal mismatch stress, which is formed during the process of cooling to room temperature after the coating is deposited due to the mismatch of the thermal expansion coefficient of the coating and the base material. When the thermal expansion coefficient of the coating material is greater than that of the base material, it is expressed as tensile stress, otherwise it is compressive stress. In addition, few sprayed materials induce phase change compressive stress during deposition. Thermal mismatch compressive stress and phase change compressive stress can offset part of quenching tensile stress, which is good for weakening the adverse effects of overall residual stress. However, they are limited by spraying materials and are not universal.

It is worth noting that high-velocity flame spraying (HVOF or HVAF) can be described as a unique thermal spraying technology. It has only been more than 30 years since its initial invention, but it has become the fastest-growing and most advanced thermal spraying technology. One of the most widely used techniques. On the one hand, this is due to the high particle flying speed of high-speed flame spraying technology, which makes the advantages of preparing metal, ceramic and composite coatings quite obvious. On the other hand, due to the moderate flame temperature of high-speed flame spraying, spraying some ceramics When coating powder or high-melting point metal powder, the powder material is not completely melted, and has a certain elastic-plastic strain energy. When the powder is deposited on the surface to be sprayed at a high speed, it will produce a hammering compressive stress equivalent to the shot peening effect, which is extremely large. Many adverse effects caused by quenching tensile stress are weakened, and the overall quality of the coating is greatly improved.

The cold spraying technology makes full use of the hammering effect produced by the high-speed impact of the sprayed particles on the surface to be sprayed, so that the coating exhibits compressive stress. However, due to the low temperature of the sprayed particles, the flying speed of the particles must be high enough and the material is easy to spray. Plastic deformation is required for reliable deposition of coatings.

It can be seen that it is important to design a technical solution that can improve the residual stress distribution inside the coating during the thermal spraying process without affecting the deposition effect of the sprayed material, thereby producing a performance enhancement effect of the coating and improving the performance of the coating. There is an urgent need to dig deeper.

Contents of the invention

The object of the present invention is to provide a thermal spraying coating forming method realized by combining spraying materials and bombardment particles, which solves the problem of large residual tensile stress and low coating quality of existing thermal spraying coatings through a simple, effective and low-cost method. The problem is that while improving the distribution of residual stress inside the coating, it does not affect the deposition effect of the sprayed material, thereby producing a coating performance strengthening effect and improving the intrinsic performance and performance of the coating.

In order to achieve the above object, the present invention adopts the following technical solutions:

A thermal spraying coating forming method realized by combining spraying materials and bombardment particles, which is characterized in that it includes the steps: the spraying material is heated to a molten or completely molten state by a spraying heat source, accelerated and propelled by a gas jet, and hits the surface of a substrate Or the surface of the deposited coating is flattened and deposited continuously to achieve thickening and forming. At the same time, the bombardment particles with elastic-plastic strain energy bombard the flattened deposited coating under the action of the same gas jet or a separate gas jet. layer, which is partially or totally dissipated after colliding with the coating, wherein: the bombardment particles are heated to a temperature below their melting point before bombarding the coating.

When the spraying material and the bombardment particles use the same gas jet, the spray material and the bombardment particles enter the gas jet at the same point and mix, or enter the gas jet at different points and Blending occurs downstream of the gas jet, after which the spray material flies through the same thermal spray environment as the bombardment particles.

When the spraying material and the bombardment particles use different gas jets, the thermal spraying environment through which the bombardment particles fly and the thermal spraying environment through which the spraying material flies are independent or partially overlapped.

The spraying heat source is a heat source obtained by electric arc, plasma or combustion flame.

When the spraying material is powder, the thermal spraying equipment used for coating formation is powder plasma spraying equipment or powder flame spraying equipment, wherein: the powder flame spraying equipment is ordinary flame spraying equipment or high-speed flame spraying equipment.

When the spraying material is wire, the thermal spraying equipment used for coating formation is arc spraying equipment, wire plasma spraying equipment or wire flame spraying equipment.

The material of the bombardment particles is metal or non-metal. The shape of the bombardment particles is spherical or cylindrical pellets with regular appearance, or sand-like particles with corners.

The advantages of the present invention are:

1. During the thermal spraying process, the present invention utilizes the elastic-plastic strain energy characteristics of the bombardment particles to simultaneously bombard the surface of the deposited coating. While realizing the effective deposition and thickening of the sprayed material, the bombardment particles produce "tamping" effect, which improves the residual stress distribution inside the coating, that is, reduces the residual tensile stress and increases the residual compressive stress within a reasonable range, thus significantly weakening the adverse effects of the quenching stress (tensile stress) induced by coating deposition. The overall quality and performance have been improved and strengthened, and the intrinsic properties and performance of the coating have been greatly improved.

2. The present invention is compared with existing high-speed flame spraying (or claiming supersonic flame spraying), even cold spraying technology, although existing high-speed flame spraying, cold spraying technology have improved residual stress distribution, but to spray material, deposition rate etc. However, the spraying process proposed by the present invention has few restrictions on spraying materials and bombardment particles, and can be flexibly designed, easy to operate, strong in versatility, low in implementation cost, and wide in scope of application According to different thermal spraying processes and spraying materials, bombardment particles and processes can be reasonably selected for implementation.

Description of drawings

Fig. 1 is the implementation flowchart of the present invention.

Fig. 2 is an explanatory diagram of Embodiment 1 of the present invention.

Fig. 3 is a curve diagram of residual stress on the surface of the coating obtained by spraying the mixed powder under different mixing ratios.

Fig. 4A is a cross-sectional topography of the coating obtained by spraying without adding bombardment particles.

Fig. 4B is a cross-sectional topography of the coating obtained by spraying with 30% bombardment particles.

Fig. 5 is a graph showing microhardness curves of coatings obtained by spraying mixed powders at different mixing ratios.

Fig. 6 is an explanatory diagram of Embodiment 2 of the present invention.

Fig. 7 is a random test distribution diagram of the surface residual stress of the coating obtained by spraying under the condition of not adding bombardment particles and adding bombardment particles.

Fig. 8A is a cross-sectional topography of the coating obtained by spraying without adding bombardment particles.

Fig. 8B is a cross-sectional topography diagram of the coating obtained by spraying with bombardment particles.

Fig. 9 is an explanatory diagram of Embodiment 3 of the present invention.

Fig. 10 is a curve diagram of the surface residual stress of the coating obtained by spraying under different carrier gas pressures.

Fig. 11 is an explanatory diagram of Embodiment 4 of the present invention.

detailed description

As shown in Figure 1, the thermal spraying coating shaping method that spraying material of the present invention combines with bombardment particle and realizes comprises the following steps:

The spraying material is heated by the spraying heat source to a molten or completely molten state (that is, close to or exceeding the melting point of the spraying material), accelerated by a high-kinetic gas jet, and hits the surface of the substrate such as the workpiece or the surface of the deposited coating at a high speed. At the same time, the bombardment particles with a certain elastic-plastic strain energy have been bombarded under the action of the same gas jet (that is, the spraying material and the bombardment particles use the same gas jet) or a separate gas jet (that is, the spraying material and the bombardment particles use different gas jets). Flatten the deposited coating, by adjusting the process parameters related to spraying and particle bombardment, some (usually most) or all of the bombarded particles collide with the coating and bounce off and dissipate, wherein: the melting point of the bombarded particles is higher than its The temperature borne during the entire thermal spraying process, that is, the heating temperature, in other words, the bombardment particles are heated when they fly through the thermal spraying environment higher than normal temperature, so that the temperature of the bombardment particles rises, but even when the bombardment particles and the coating When the layer material collides, the heating value of the bombardment particles cannot exceed the melting point of the bombardment particles themselves, so that the bombardment particles must have elastic-plastic strain energy before the collision, so as to achieve the bombardment effect.

Generally, the smaller the temperature rise of bombarded particles and the higher the collision velocity, the more obvious the bombardment effect, that is, the greater the plastic strain and residual compressive stress suffered by the sprayed material. Moreover, the temperature rise and flight speed of the bombarding particles can be adjusted by changing the jet energy that pushes the bombarding particles and the parameters such as the material, size and shape of the bombarding particles.

Usually, most of the bombardment particles will rebound and dissipate under the action of collision, and only a very small part of the bombardment particles will be deposited together with the spraying material, which can reduce the deposition amount of the bombardment particles by adjusting the spraying and bombardment process, and It will not affect the performance of the coating obtained by thermal spraying.

In the present invention, the spraying material will be heated to a molten or completely melted state during the thermal spraying process, but the melting point of the bombardment particles is higher than the temperature rise value of the entire thermal spraying environment that it flies through, so it will not be melted. Furthermore, during the entire thermal spraying process from entering the corresponding thermal spraying equipment to colliding with the coating, the temperature rise of the bombardment particles is very limited, so they can still have a certain elastic-plastic strain energy, so that they can be used to achieve bombardment collision. Flatten the deposited coating.

When the spray material and bombardment particles use the same gas jet, the spray material and bombardment particles enter the gas jet at the same point and mix, or enter the gas jet at different points and mix downstream of the gas jet , after blending, the spraying material and the bombardment particles fly through the same thermal spraying environment. In this case, the melting point of the bombardment particles is usually required to be higher, so that although the temperature rises larger, it can still maintain a high strain energy. It is conducive to the bombardment effect.

When the spraying material and the bombardment particles use different gas jets, the thermal spraying environment that the bombardment particles fly through and the thermal spraying environment that the spraying material flies through are independent or a small part of the path overlaps. In this case, the heat of the bombardment particles can be The temperature is small, and the bombardment particles with high or low melting point can be selected without limitation.

In the present invention, the spraying heat source is a heat source obtained by electric arc, plasma or combustion flame, and has a wide range of applications.

In actual implementation, when the spraying material is powder, the thermal spraying equipment used for coating forming can be powder plasma spraying equipment or powder flame spraying equipment, wherein: powder flame spraying equipment can be ordinary flame spraying equipment or high-speed flame spraying equipment .

For example, when implementing powder thermal spraying, relatively low melting point powder can be mixed with high melting point bombardment particles, such as particles such as sand or ceramic pellets. In this way, although the powder and the mixed bombardment particles will be heated together, due to the The melting point is higher than the heating temperature, so when they reach the surface of the substrate, the powder has been heated to close to or exceed its melting point, while the bombardment particles have a certain heating, but their melting point is much higher than their heating temperature, so they can maintain a high temperature. Bombardment collision energy.

For another example, when implementing powder thermal spraying, the powder is sent into the high temperature zone of the spray gun (or enters the spray gun heating in advance), and the bombardment particles (sand or shot) are sent into the low temperature zone of the spray gun (or enters the spray gun later). Medium heating), which can reduce the heating time of the bombardment particles, so that the heating temperature is much lower than its own melting point, ensuring a relatively low temperature when bombarding the coating and maintaining high bombardment collision energy.

For another example, when powder thermal spraying is carried out, the powder is heated and accelerated by the high-temperature and high-speed gas jet of the spray gun, while the bombardment particles are sprayed to the deposition spots with the acceleration of the low-temperature gas jet through another spray gun device, so as to ensure that the powder spraying jet and the bombardment particle jet On the basis of mutual matching and synchronous operation among them, it is ensured that the bombardment particles maintain an extremely low temperature to bombard the hot deposited coating.

In actual implementation, when the spraying material is wire, the thermal spraying equipment used for coating formation can be arc spraying equipment, wire plasma spraying equipment or wire flame spraying equipment.

For example, when performing wire spraying, the bombardment particles can be injected in the form of a powder into the thermal spray jet of the spray material or sprayed on the deposition spot with a separate low-temperature gas jet, thereby ensuring that the bombardment particles remain at a lower temperature to coat the hot deposition. bombardment.

In a few cases, it can be sprayed in the form of powder core wire, that is, the bombardment particles are used as all or part of the filling powder, and the filling powder is covered with a metal sheath to form a powder core wire. When using this powder core wire material for spraying, in terms of the material design of the bombardment particles, the selection of thermal spraying equipment and other factors, it is necessary to meet the requirements that the bombardment particles will not be overheated, while other components in the wire can be sufficiently heated and deposited reliably .

As shown in Figure 1, before thermal spraying, preferably, the surface of the substrate should be fully pretreated (purification, roughening and activation treatment), that is, the surface of the substrate to be sprayed is degreased, derusted, Sandblasting (or electric brushing) and other pretreatments to ensure reliable bonding between the sprayed material and the surface of the substrate.

During thermal spraying, parameters such as the heating temperature, flight speed and flow rate of the spraying material and bombardment particles are adjusted by adjusting the pressure and temperature of the corresponding gas jet, and at the same time, parameters such as the material, shape, and particle size of the design bombardment particles are selected to meet different requirements. Thermal spraying technology and the requirements for bombardment particles under different spraying material conditions can not only ensure that the bombardment particles can be reliably desorbed after hitting the deposited coating surface, but also facilitate the subsequent spraying materials on the bombarded coating surface. Deposition, and avoid the possibility of peeling off the deposited coating due to excessive bombardment, to achieve high-quality bombardment effect.

Example 1:

As shown in Figure 2, a composite powder mixed with powder and bombarded particles with high melting point is applied by high-velocity flame spraying. Specifically, 50 g of FeBSiNb amorphous powder is selected as the spraying material 50, white corundum sand is selected as the bombardment particles 60, and the mass ratio of the spraying material 50 and the bombardment particles 60 is 9:1 or 8:2 or 7:3 or 6:4 or 5: 5 Mix evenly in equal proportions, wherein: the particle size of the amorphous powder is -325-200 mesh, and the melting point is 1220°C; the particle size of the white corundum sand is -150-100 mesh, and its main components are Al ₂ O ₃ , Al ₂ O ₃ The content of Al 2 O 3 is 95% to 97%, and the melting point of Al ₂ O ₃ is 2054°C. The flame spraying gun 30 is selected as the thermal spraying equipment, and its spraying heat source is the combustion flame generated by the mixture of the igniter 31 igniting the fuel 32 and the supporting gas 33 shown in FIG. 2 . The substrate 10 to be sprayed is 45# steel of 70mm×30mm×8mm.

Before spraying, degrease, derust and sandblast the 45# steel. Then carry out flame spraying with the mixed powder material of proportioning by spraying gun 30, spraying parameter is: C ₂ H ₂ flow rate 1.3m ³ /h, O ₂ flow rate 0.7m ³ /h, powder feeding rate 35g/min, spraying distance 180mm, cooling air pressure 0.4MPa. FIG. 2 schematically shows the deposited coating 20 .

Figure 3 is the residual stress curve of the coating surface obtained by spraying the mixed powder under different mixing ratios. It can be seen from Figure 3 that the residual tensile stress on the coating surface after adding bombardment particles is reduced. When the spraying material 50 and the bombardment particles 60 are mixed in a mass ratio of 8:2, the residual tensile stress decreases the most, up to 43.8%.

Figure 4A and Figure 4B are the cross-sectional morphology of the coating obtained by spraying without bombardment particles, and the coating obtained by spraying with 30% bombardment particles (the spraying material 50 and the bombardment particles 60 are mixed uniformly in a mass ratio of 7:3). cross-sectional morphology. The morphology shown in Figure 4A and Figure 4B is roughly divided into upper and lower three layers, the bottom layer is the substrate, the middle layer is the coating obtained by spraying, and the top layer is the mounting material used in the preparation of metallographic samples. From Figure 4A and Figure 4B, it can be seen that the porosity of the coating obtained by spraying without bombardment particles is relatively large, about 1.2%, while the coating obtained by spraying with bombardment particles is very dense and uniform, and the porosity is small, only Around 0.5%, down 58.3%.

Fig. 5 is the microhardness curve of the coating obtained by spraying the mixed powder under different mixing ratios. It can be seen from Figure 5 that the hardness of the coating is significantly improved after the bombardment particle bombardment, and the hardness can reach 794.7HV, which is 18.1% higher than the hardness of the coating without the bombardment particle spray coating (672.4HV).

Example 2:

As shown in Figure 6, high-velocity flame spraying is used, but the powder is sent into the high-temperature zone of the jet, and the bombardment particles are sent into the low-temperature zone of the jet. Specifically, the spray material 50 is FeCrBSiNb amorphous powder with a particle size of -325-200 mesh and a melting point of 1350°C. The bombardment particles 60 are made of white corundum sand with a particle size of -150 to 80 mesh. The thermal spraying equipment uses kerosene fuel high-speed flame spraying gun 40, and its spraying heat source is the high-temperature high-speed flame jet formed by combustion of the mixture of igniter 41 igniting fuel 42 and supporting gas 43 shown in Fig. 6 . The substrate 10 to be sprayed is 45# steel of 70mm×30mm×8mm.

Before spraying, degrease, derust and sandblast the 45# steel. The spraying parameters of kerosene fuel high-speed flame spraying gun 40 are: O ₂ flow rate 45.0Nm ³ /h, kerosene flow rate 21.0L/h, combustion chamber pressure 6.5bar, spraying distance 250mm, spray gun moving speed 800mm/s, delivery rate of spraying material 50 The powder rate is 35g/min, and the powder feeding rate of the bombardment particle 60 is 15g/min. FIG. 6 schematically shows the deposited coating 20 .

Figure 7 is a random test distribution diagram of the surface residual stress of the coating obtained by spraying without adding bombardment particles and adding bombardment particles. The abscissa in the figure is the test number, indicating the 1st, 2nd, 3rd, ..., 6th test. It can be seen from Figure 7 that the residual stress of the coating surface obtained by spraying after adding bombardment particles was randomly tested for 6 times, and the average value of the residual stress obtained by the 6 tests was -114.5MPa. Six random tests were carried out on the coating surface sprayed without bombardment particles, and the average residual stress obtained from the six tests was -57MPa. Therefore, it can be seen that under the condition of adding bombardment particles, compared with the condition of no addition of bombardment particles, the residual compressive stress is about 1 times higher, and the fluctuation range of residual stress becomes smaller and more stable.

Figure 8A and Figure 8B are respectively the cross-sectional morphology of the coating obtained by spraying without bombardment particles and the cross-sectional morphology of the coating obtained by spraying with bombardment particles. It can be seen from Fig. 8A and Fig. 8B that the overlapping interface of deposited particles in the coating obtained by spraying without bombardment particles is more obvious, while the coating obtained by spraying with bombardment particles is denser and more uniform. It can be seen that the impact of the bombardment particles can effectively increase the plastic deformation of the deposited particles, increase the residual stress, and improve the coating quality.

Example 3:

As shown in Figure 9, the spray material 50 is heated and accelerated by the jet flow of the flame spray gun 70, and is deposited on the surface of the substrate 10 to form a coating 20. The mixture of 73 forms the combustion flame jet. The bombardment particles 60 are accelerated toward the deposition spots by the cryogenic gas jet of another spraying device, the shot gun 80 .

Specifically, the spray material 50 is FeCrBSiNb amorphous powder with a particle size of -325-200 mesh and a melting point of 1350°C. The bombardment particle 60 is made of cut stainless steel pellets with a particle size of 1.2 mm to 2 mm. The base body 10 is made of 45# steel of 70mm×30mm×8mm.

Before spraying, degrease, derust and sandblast the 45# steel. The spraying parameters of the flame spray gun 70 are: C ₂ H ₂ flow rate 1.3m ³ /h, O ₂ flow rate 0.7m ³ /h, powder feeding rate 35g/min, spraying distance 180mm, cooling air pressure 0.4MPa. The bombardment particles 60 cooperate with the flame spraying gun 70 through the pressure-feeding shot peening gun 80, and the shot peening intensity is controlled by adjusting the gas pressure. The gas pressure of the shot peening gun 80 is set at 0.2MPa-0.4MPa. FIG. 9 schematically shows the deposited coating 20 .

Fig. 10 is the residual stress curve of the coating surface prepared under different carrier gas pressures bombarding the particles. It can be seen from Figure 10 that the surface residual stress of the coating obtained without bombardment particle impact spraying (that is, the process corresponding to the carrier gas pressure of 0MPa in the figure) is tensile stress, and the residual stress value is 256MPa. The residual stress on the surface of the coating obtained by impact spraying under the impact is still tensile stress, and the average value of residual stress is 31MPa, while the residual stress on the surface of the coating obtained by bombardment particle 60 impact spraying under 0.4MPa air pressure has become compressive stress, and the average value of residual stress is 31MPa. -115MPa. It can be seen that after the bombardment of the bombardment particles, the residual stress of the coating is continuously reduced from tensile stress to compressive stress, which has been greatly improved.

Example 4:

As shown in Figure 11, the spraying material is a wire material, which is melted by an arc and accelerated atomization by a high-speed atomizing airflow (primary airflow), and another gas jet (secondary airflow) accelerates the injected bombardment particles to form bombardment particles stream, sprayed into the arc area. The bombardment particles are slightly affected by the arc heating, and finally form a mixed flow of wire droplet and bombardment particles, and complete the integrated forming coating of droplet spray deposition and bombardment particle impact.

Specifically, the spraying material 50 is made of FeBSiNb amorphous powder core wire material, and the bombardment particles are made of brown corundum spraying sand with a particle size of -120-80 mesh. The high-speed arc spray gun 90 is used for thermal spraying equipment. The base body 10 is made of 45# steel of 70mm×30mm×8mm.

Before spraying, degrease, derust and sandblast the 45# steel. The spraying parameters of the arc spray gun 90 are: voltage 36V, current 200A, spraying distance 180mm, conveying air pressure of spraying material 0.75MPa, conveying air pressure of bombardment particles 0.75MPa. FIG. 11 schematically shows the deposited coating 20 and the arc 100 formed by the arc torch 90 .

It can be seen from the test results that the internal residual stress of the coating obtained after the impact of the bombardment particles is compressive stress, the bonding strength between the coating and the substrate is greatly improved, and the coating becomes denser. Under the action of particles, various properties of the coating have been significantly improved and improved.

The thermal spraying process of the present invention is not limited to a specific thermal spraying technology, and can be used in other thermal spraying technologies besides the thermal spraying technology described in the embodiment of the present invention. The thermal spray material is also not limited to the amorphous powder or wire described in the examples.

The material selection of the bombardment particles is not limited to a specific material, it can be metal or non _- metallic material, except the materials mentioned in the embodiment, WC, ZrO2 and other materials with higher melting point can also be used as the bombardment particles , In addition, the shape and particle size of the bombardment particles are not limited. Generally speaking, the particle size is applicable within the range of 10 μm to 2mm. The shape can be spherical, cylindrical and other regular pellets, or it can be with sharp edges. sand-like irregular particles.

The bombardment particles can be made of hard or non-hard material. The hardness of the bombarded particles does not have to be higher than that of the coating material, because the sprayed material maintains a higher temperature during deposition and solidification, so it has better plastic deformation ability, as long as the hardness of the bombarded particles is convenient for the bombarded particles to hit the coating It will not stick to the coating due to its excessive plastic deformation and make it inconvenient to detach.

The advantages of the present invention are:

During the thermal spraying process, the present invention utilizes the elastic-plastic strain energy characteristics of the bombardment particles to simultaneously bombard the surface of the deposited coating, while realizing the effective deposition and thickening of the sprayed material, the bombardment particles produce a "tamping" effect, The residual stress distribution inside the coating is improved, that is, the residual tensile stress is reduced, and the residual compressive stress is increased within a reasonable range, thereby significantly weakening the adverse effects of the coating deposition-induced quenching stress (tensile stress), and the overall quality of the coating The performance and performance have been improved and strengthened, and the intrinsic properties and performance of the coating have been greatly improved. Moreover, the spraying process proposed by the present invention has few restrictions on spraying materials and bombardment particles, can be designed flexibly, is convenient to operate, has strong versatility, low implementation cost, and has a wide range of applications. It can be used for different thermal spraying processes and spraying Materials are properly selected to bombard particles for implementation.

The above are the preferred embodiments of the present invention and the technical principles used therein. For those skilled in the art, without departing from the spirit and scope of the present invention, any technical solution based on the present invention, etc. Obvious changes such as effective conversion and simple replacement all fall within the protection scope of the present invention.

Claims (7)

1. the hot-spraying coating manufacturing process that a kind of sprayed on material is implemented in combination with bombardment particle phase, it is characterised in that it includes Step：

Sprayed on material is heated to melting or being completely melt state by spraying thermal source, and accelerates promotion by gas jet, hits Occur flattening deposition to matrix surface or the coating surface deposited and be constantly superimposed and realize and thicken shaping, at the same time, Bombardment particulate with elastic and plastic strain energy bombards flattening in the presence of same gas jet or independent gas jet The coating of deposition, partly or entirely occurs to rebound and dissipates with coating collision rift, wherein：Bombard heated before microparticle bombardment coating Temperature is less than its fusing point.

2. the hot-spraying coating manufacturing process that sprayed on material as claimed in claim 1 is implemented in combination with bombardment particle phase, it is special Levy and be：

When the sprayed on material uses same gas jet with the bombardment particulate, the sprayed on material and the bombardment particulate Enter in gas jet and blend at same position point, or enter at diverse location point in gas jet and in gas The downstream of jet is blended, and the sprayed on material passes through identical thermal spraying environment with the bombardment particulate flight after blending；

When the sprayed on material uses different gas jets respectively from the bombardment particulate, the bombardment particulate flight is passed through Thermal spraying environment and the sprayed on material fly that each independence or part path are overlapping for the thermal spraying environment that passes through.

3. the hot-spraying coating manufacturing process that sprayed on material as claimed in claim 1 is implemented in combination with bombardment particle phase, it is special Levy and be：

The spraying thermal source is the thermal source obtained by electric arc, plasma or combustion flame.

4. the hot-spraying coating manufacturing process that sprayed on material as claimed in claim 1 is implemented in combination with bombardment particle phase, it is special Levy and be：

When the sprayed on material is powder, the thermal spraying apparatus for coating formation is powder plasma spraying equipment or powder Flame spray device, wherein：Flame spray powder coating equipment is common flame spraying equipment or HVOF equipment.

5. the hot-spraying coating manufacturing process that sprayed on material as claimed in claim 1 is implemented in combination with bombardment particle phase, it is special Levy and be：

When the sprayed on material is silk material, the thermal spraying apparatus for coating formation is electric arc spraying equipment, silk material plasma Spraying equipment or silk material flame spray device.

6. the hot-spraying coating that sprayed on material as any one of claim 1 to 5 is implemented in combination with bombardment particle phase into Shape method, it is characterised in that：

The material of the bombardment particulate is metal or non-metallic material.

7. the hot-spraying coating that sprayed on material as any one of claim 1 to 5 is implemented in combination with bombardment particle phase into Shape method, it is characterised in that：

The spherical or cylindrical pellets for being shaped as profile rule of the bombardment particulate, or the grain-like particles with corner angle.