CN108642488B - Preparation method of high-hardness wear-resistant coating on surface of titanium alloy substrate - Google Patents

Preparation method of high-hardness wear-resistant coating on surface of titanium alloy substrate Download PDF

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CN108642488B
CN108642488B CN201810463275.7A CN201810463275A CN108642488B CN 108642488 B CN108642488 B CN 108642488B CN 201810463275 A CN201810463275 A CN 201810463275A CN 108642488 B CN108642488 B CN 108642488B
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titanium alloy
coating
powder
alloy substrate
hardness wear
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CN108642488A (en
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李玉新
苏科强
张宏建
白培康
刘斌
赵占勇
张鹏飞
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North University of China
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    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C24/00Coating starting from inorganic powder
    • C23C24/02Coating starting from inorganic powder by application of pressure only
    • C23C24/04Impact or kinetic deposition of particles
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C24/00Coating starting from inorganic powder
    • C23C24/08Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C23C24/103Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides

Abstract

The invention discloses a preparation method of a high-hardness wear-resistant coating on the surface of a titanium alloy substrate, which comprises the steps of firstly spraying spherical H13 powder on the titanium alloy substrate subjected to surface roughening treatment and preheating by adopting a cold air power spraying technology to form an H13 coating with the thickness of 50-105 mu m, and then cladding cobalt alloy powder on the surface of the H13 coating by adopting a laser cladding technology to obtain a cobalt alloy cladding coating. The invention combines the cold air power spraying technology with the laser cladding technology, prepares the high-hardness wear-resistant metal composite coating on the surface of the titanium alloy matrix, has simple preparation process, no crack and no hole defects of the metal composite coating, compact and consistent cladding layer thickness, low surface roughness and good performance, and has high bonding strength between the coating and the surface of the matrix, which can reach 45-55 MPa.

Description

Preparation method of high-hardness wear-resistant coating on surface of titanium alloy substrate
Technical Field
The invention belongs to the technical field of surface treatment of metal materials, and relates to a surface modification treatment method for a titanium alloy material, in particular to a method for preparing a metal composite coating on the surface of a titanium alloy.
Background
The titanium alloy material has low density, high specific strength, excellent high temperature mechanical performance and excellent corrosion resistance, and is widely applied to various industries such as aviation, aerospace, chemical industry, petroleum and the like.
However, the titanium alloy material also has the defects of high friction coefficient, poor wear resistance, high-temperature and high-speed friction, flammability and the like, and the application of the titanium alloy material is severely limited today when the requirements on manufacturing technology and material performance are increasingly improved. Therefore, domestic and foreign material research workers have conducted extensive research on the application of surface modification technologies such as ion implantation, vapor deposition and micro-arc oxidation to titanium alloy substrates, and hopefully, a coating with excellent performance can be prepared on the surface of the titanium alloy so as to improve the surface performance of the titanium alloy material.
In recent years, laser technology has been rapidly developed and has become an effective means for material welding, cutting, molding and surface modification. Laser cladding is one of surface modification technologies, and a layer of enhanced phase material is welded on the surface of a base material by taking a laser beam as a heat source, so that the base material and the enhanced phase material are metallurgically combined together, and the service life of the material is greatly prolonged. The laser cladding technology has the advantages of high instantaneous heating temperature, high cooling speed, small heat influence on a workpiece, high bonding strength of a cladding layer and a substrate and the like.
However, under the influence of factors such as compatibility between the coating material and the matrix and thermophysical differences, direct laser cladding of the coating on the titanium alloy matrix can result in reduced bonding strength between the coating and the matrix, poor tissue compactness of the clad coating and increased surface roughness of the coating.
Disclosure of Invention
The invention aims to overcome the problems of high friction coefficient and poor wear resistance of a titanium alloy material and provides a preparation method of a high-hardness wear-resistant coating on the surface of a titanium alloy substrate, which is simple in process.
The preparation method of the high-hardness wear-resistant coating on the surface of the titanium alloy substrate is to combine a cold air dynamic spraying technology with a laser cladding technology to prepare the high-hardness wear-resistant coating on the surface of the titanium alloy substrate, and the specific preparation process is as follows.
1) And cleaning and roughening the surface of the titanium alloy substrate, and preheating to 100-300 ℃.
The cleaning treatment adopts a method of sanding and then cleaning with a solvent, and aims to remove all dirt on the surface of the titanium alloy matrix, such as oxide skin, oil stain, paint and other dirt, and the key is to remove the surface of the matrix and the grease infiltrated into the surface of the matrix. Preferably, the solvent used may be acetone, ethanol or trichloroethylene.
The coarsening treatment is carried out by adopting a sand blasting technology, and aims to increase the contact surface between the substrate and the coating, increase the mechanical biting force between the coating and the substrate and enable the surface of the cleaned substrate to be more activated. Meanwhile, the coarsening treatment of the surface of the matrix can change the distribution of residual stress in the coating and is beneficial to improving the bonding strength of the coating.
Specifically, the coarsening treatment uses sand grains with the granularity of 16-40#The sand blasting pressure of the coarse sand is 0.3-0.7 Mpa.
Preferably, the surface of the titanium alloy substrate is roughened to a roughness of 5 to 10 Ra.
The titanium alloy matrix after treatment is put into a vacuum heating furnace for preheating treatment. The purpose of preheating is to eliminate moisture and humidity on the surface of the substrate, increase the interface temperature when the sprayed particles are in contact with the surface of the substrate, improve the bonding strength of the coating and the substrate, and reduce the cracking of the coating caused by stress due to the difference in thermal expansion between the substrate and the coating material.
2) And carrying out atomization granulation treatment on the H13 die steel powder to prepare spherical H13 powder.
The H13 die steel powder is atomized and granulated by a pressure sprayer to prepare powder particles into uniform spherical shapes.
Specifically, the H13 die steel powder is prepared into slurry, the slurry is sent into a rotating chamber of a pressure type sprayer, the rotating chamber atomizer rotates at high speed to atomize to form fog drops, the fog drops enter a spray drying chamber, and hot air is used for drying to prepare spherical H13 powder.
More specifically, the H13 die steel powder slurry is fed into a rotating chamber at a feeding rate of 20-30 mL/min.
More specifically, the rotating speed of the rotating disc atomizer is 180-200 r/s.
More specifically, the formed fog drops are contacted with hot air which uniformly enters a spray drying chamber in a spiral shape in a parallel flow manner to carry out mass and heat transfer, and the fog drops are dried. Preferably, the drying temperature is set to be 200-210 ℃.
By the method, the spherical H13 powder with the granularity of 10-30 mu m can be prepared.
More preferably, the invention uses a 200 mesh H13 die steel powder to make the round spherical H13 powder.
3) And spraying the spherical H13 powder on the surface of the titanium alloy substrate by adopting a cold air dynamic spraying technology to form an H13 coating with the thickness of 50-105 mu m.
The cold air dynamic spraying technology of the invention takes compressed nitrogen as carrier gas and pushing gas, wherein the carrier gas introduces the spherical H13 powder into a supersonic speed spray gun, the pushing gas enters the supersonic speed spray gun after being heated to form gas-solid dual-phase flow with the spherical H13 powder, supersonic speed spraying is obtained from a narrow throat part to an expansion section of a nozzle of the supersonic speed spray gun, and the H13 coating is formed by impacting on the surface of the titanium alloy substrate at high speed.
Specifically, in the method, the powder supply amount of the spherical H13 powder is 5-15 kg/H.
Furthermore, the propelling gas enters the supersonic speed spray gun at the temperature of 250-350 ℃ and the pressure of 3-4 MPa, and the flow speed of the gas entering the supersonic speed spray gun is controlled to be 1-2 m3/min。
In the invention, the distance between the nozzle outlet of the supersonic speed spray gun and the surface of the titanium alloy substrate is 10-20 mm.
The H13 coating formed by the method is in a semi-metallurgical bonding state with the titanium alloy substrate, and the bonding strength can reach 45-55 MPa.
4) And cladding the cobalt alloy powder on the surface of the H13 coating by adopting a laser cladding technology to obtain the cobalt alloy cladding coating.
The laser cladding process is carried out in an Ar protective gas environment, preferably, the laser power is set to be 800-1200W, the diameter of a light spot is 1.5-17 mm, and the cobalt alloy powder is subjected to laser cladding at a laser scanning speed of 3-7 mm/s.
More preferably, in the laser cladding process, the flow of the Ar protective gas is 5-15L/min.
In the laser cladding process, the scanning lap joint rate of laser scanning is preferably 30-50%.
In the invention, the fineness of the cobalt alloy powder is 80-150 meshes, and the cobalt alloy powder is used after being dried in vacuum for 1-2 hours at 100-300 ℃.
Cold gas dynamic spray techniques differ from hot gas spray methods in that they can produce a metal coating on a work surface using unmelted metal particles. The characteristic ensures that the prepared coating has low porosity, small heat load between the matrix material and the coating, less material oxidation and elimination of the phenomenon of nonuniform crystallization in the coating. Therefore, cold gas dynamic spray coating technology has been rapidly developed in various fields in recent years.
According to the invention, a cold air power spraying technology and a laser cladding technology are combined, and the high-hardness wear-resistant metal composite coating is prepared on the surface of the titanium alloy substrate, so that the preparation process is simple, and the porosity of the cladding layer is low and is only 0.49-0.75%.
The high-hardness wear-resistant metal composite coating prepared by the method has no crack and no hole defect, the cladding layer is compact and consistent in thickness, the surface roughness is low, the performance is good, and the bonding strength between the coating and the surface of the matrix is high and can reach 45-55 MPa.
Drawings
FIG. 1 is a scanning electron microscope image of the cross section of the metal composite coating on the surface of the titanium alloy substrate in example 1.
FIG. 2 is a scanning electron microscope image of the cross section of the titanium alloy substrate surface directly clad with the coating in the comparative example.
Detailed Description
The following examples are only preferred embodiments of the present invention and are not intended to limit the present invention in any way. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Example 1.
Sequentially using sand paper and acetone to remove rust and oil stains on the surface of the TC4 titanium alloy plate substrate, and adopting 25#Sand blasting and coarsening the surface of the plate substrate under the sand blasting pressure of 0.3MPa, and then putting the treated plate into a vacuum heating furnace to preheat to 250 ℃.
Preparing 200-mesh H13 die steel powder into slurry, enabling the slurry to enter a rotating chamber at a high speed from a tangential channel of a rotary disc atomizer at a feeding rate of 30mL/min under the action of a high-pressure pump, forming tiny fog drops under the action of the rotary disc atomizer at a high speed of 200r/s, enabling the fog drops to enter a spray drying chamber at 210 ℃ under the pressure of the high-pressure pump, enabling the fog drops to be in parallel-flow contact with hot air which uniformly enters the spray drying chamber in a spiral shape, generating mass and heat transfer, and drying the fog drops in a very short time to prepare spherical H13 die steel powder with the granularity of 10 mu m.
The spherical H13 die steel powder is loaded into a powder feeder by adopting a cold gas dynamic spraying technology, compressed nitrogen is used as carrier gas, the carrier gas is introduced into a supersonic speed spray gun with the powder supply of 13kg/H, and compressed nitrogen with the pressure of 4.0MPa is used as pushing gas, and the pressure of the carrier gas is 2m3And the gas flow rate of/min enters a supersonic speed spray gun to form gas-solid dual-phase flow with the die steel powder, the compressed nitrogen is heated to 300 ℃ to improve the gas flow rate, the gas is sprayed out after supersonic speed is obtained from a narrow throat part to an expansion section of the spray nozzle, and the gas impacts the surface of a TC4 matrix 20mm away from the spray nozzle at high speed to form an H13 spraying layer with the thickness of 100 mu m. The sprayed layer and the matrix are in a semi-metallurgical bonding state, and the bonding strength can reach 55 MPa.
And mechanically screening out cobalt alloy powder of 80-150 meshes, carrying out vacuum drying for 2H at 100 ℃, naturally cooling, and then putting into a coaxial carrier gas powder feeding device, and carrying out laser cladding on the surface of the TC4 plate substrate sprayed with the H13 coating.
The laser power of the semiconductor laser is 1200W, the diameter of a light spot is 4mm, and the flow of protective Ar gas is 15L/min. A laser head of a semiconductor laser is aligned to a region to be clad on the surface of an H13 coating on a TC4 plate substrate, a coaxial carrier gas powder feeding device is used for uniformly feeding cladding material cobalt alloy powder to the aligned surface of the laser head, and a laser beam emitted by the laser irradiates the cobalt alloy powder to be melted to form a molten drop. And continuously scanning the region to be clad on the surface of the H13 coating by the semiconductor laser at a scanning speed of 5mm/s according to a set track, wherein the scanning overlap ratio is 50%, and thus obtaining the TC4 plate sample for laser cladding of the cobalt alloy coating on the surface of the H13 coating.
FIG. 1 shows the cross section of the coating of a sample observed under a metallographic microscope, and the thickness of the coating was 3.5mm as determined by using a measuring tool provided with the microscope.
Using a PD-3 portable Vickers hardness tester to measure the hardness of the coating at different points on the cobalt alloy coating of the TC4 plate for multiple times, and measuring the hardness of the coating to be 1200.42HV0.2Left and right.
The friction and wear test of the test specimens was carried out on a MG-2000 model testing machine. In the test, YG6 hard alloy with the hardness of 63-64 HRC is selected as a grinding wheel, the rotating speed is 200r/min, the abrasion time is 10min, and the test load is 200N. The abrasion loss of the sample is obtained through the test, and the abrasion rate (abrasion loss/abrasion time) is calculated, so that the friction coefficient is 0.12.
Measuring the volume of the sampleV 1 The sample is placed in a beaker filled with water, and the amount of water discharged is recorded and calculated as the sample volumeV 2 . Calculating a formula according to the porosity:P=(V 1 V 2 V 1 -1x 100%, the porosity of the sample was calculated to be 0.50%.
Comparative example 1.
The TC4 plate sample with the cobalt alloy coating directly laser-clad on the surface of the matrix is obtained by the same processing method as the example 1 except that spherical H13 die steel powder is not sprayed on the surface of the TC4 titanium alloy plate matrix.
The friction coefficient, the hardness and the porosity of the cladding layer were measured according to the test methods of example 1. The detection result shows that the hardness of the cladding layer is only 650.35HV0.2The coefficient of friction was 0.47 and the porosity was 0.85%. It can be seen that the friction coefficient of the cladding layer of example 1 is significantly lower than that of comparative example 1, the hardness is significantly higher than that of comparative example 1, and the coating compactness is significantly higher than that of example 1.
Fig. 1 and 2 show metallographic structure diagrams of cross sections of cladding coatings of example 1 and comparative example 1, respectively. It is apparent from the cross-sectional view of example 1 that the joint of the cobalt alloy layer, the H13 steel layer and the TC4 substrate layer had a dense structure, and no cracks and air-hole defects occurred in the cobalt alloy layer. While the cross section of comparative example 1 had only a two-layer structure and void defects occurred in the cobalt alloy layer.
Example 2.
Sequentially using sand paper and acetone to remove rust and oil stains on the surface of the TC4 titanium alloy plate substrate by adopting 30#Sand blasting and coarsening the surface of the plate substrate under the sand blasting pressure of 0.3MPa, and then putting the treated plate into a vacuum heating furnace to preheat to 200 ℃.
Preparing 200-mesh H13 die steel powder into slurry, enabling the slurry to enter a rotating chamber at a high speed from a tangential channel of a rotating disc atomizer at a feeding rate of 25mL/min under the action of a high-pressure pump, forming tiny fog drops under the action of the rotating disc atomizer at a high speed of 190r/s, enabling the fog drops to enter a spray drying chamber at 205 ℃ under the pressure of the high-pressure pump, enabling the fog drops to be in parallel-flow contact with hot air which uniformly enters the spray drying chamber in a spiral shape, generating mass and heat transfer, and drying the fog drops in a very short time to prepare spherical H13 die steel powder with the granularity of 25 mu m.
The spherical H13 die steel powder is loaded into a powder feeder by adopting a cold gas dynamic spraying technology, compressed nitrogen is used as carrier gas, the powder is introduced into a supersonic speed spray gun with the powder supply of 10kg/H, and compressed nitrogen with the pressure of 3.5MPa is used as pushing gas, and the pressure of the powder is 1.5m3And the gas flow rate of/min enters a supersonic speed spray gun to form gas-solid dual-phase flow with the die steel powder, the compressed nitrogen is heated to 250 ℃ to improve the gas flow rate, the gas is sprayed out after supersonic speed is obtained from a narrow throat part to an expansion section of the nozzle, and the gas impacts the surface of a TC4 matrix 15mm away from the nozzle at high speed to form an H13 spraying layer with the thickness of 80 mu m. The sprayed layer and the matrix are in a semi-metallurgical bonding state, and the bonding strength can reach 50 MPa.
And mechanically screening out cobalt alloy powder of 200-400 meshes, drying in vacuum for 1.5H at 100 ℃, naturally cooling, then loading into a coaxial carrier gas powder feeding device, and carrying out laser cladding on the surface of the TC4 plate substrate sprayed with the H13 coating.
The laser power of the semiconductor laser is 1000W, the spot diameter is 4mm, and the Ar gas flow is 10L/min. A laser head of a semiconductor laser is aligned to a region to be clad on the surface of an H13 coating on a TC4 plate substrate, a coaxial carrier gas powder feeding device is used for uniformly feeding cladding material cobalt alloy powder to the aligned surface of the laser head, and a laser beam emitted by the laser irradiates the cobalt alloy powder to be melted to form a molten drop. And continuously scanning the region to be clad on the surface of the H13 coating by the semiconductor laser at a scanning speed of 5mm/s according to a set track, wherein the scanning overlap ratio is 40%, and thus obtaining the TC4 plate sample for laser cladding of the cobalt alloy coating on the surface of the H13 coating.
According to the method of example 1The detection method shows that the thickness of the coating is 4.1mm, and the hardness of the coating is 1117.21HV0.2About, the porosity was 0.61%, and the friction coefficient was 0.18.
Comparative example 2.
The same processing method as example 2 was carried out except that spherical H13 die steel powder was not sprayed on the surface of the TC4 titanium alloy substrate, and a TC4 plate sample with a cobalt alloy coating directly laser-clad on the surface of the substrate was obtained.
The friction coefficient, the hardness and the porosity of the cladding layer were measured according to the test methods of example 1. The detection result shows that the hardness of the cladding layer is only 524.15HV0.2The coefficient of friction was 0.35 and the porosity was 0.93. It can be seen that the friction coefficient of the cladding layer of example 2 is significantly lower than that of comparative example 2, the hardness is significantly higher than that of comparative example 2, and the coating compactness is significantly higher than that of example 2.
Example 3.
Sequentially using sand paper and acetone to remove rust and oil stains on the surface of the TC4 titanium alloy plate substrate, and adopting 35#Sand blasting and coarsening the surface of the plate substrate under the sand blasting pressure of 0.3MPa, and then putting the treated plate into a vacuum heating furnace to preheat to 150 ℃.
Preparing 200-mesh H13 die steel powder into slurry, enabling the slurry to enter a rotating chamber at a high speed from a tangential channel of a rotating disc atomizer at a feeding rate of 20mL/min under the action of a high-pressure pump, forming tiny fog drops under the action of the rotating disc atomizer at a high speed of 180r/s, enabling the fog drops to enter a spray drying chamber at 200 ℃ under the pressure of the high-pressure pump, enabling the fog drops to be in parallel-flow contact with hot air which uniformly enters the spray drying chamber in a spiral shape, generating mass and heat transfer, and drying the fog drops in a very short time to prepare spherical H13 die steel powder with the granularity of 30 mu m.
The spherical H13 die steel powder is loaded into a powder feeder by adopting a cold air dynamic spraying technology, compressed nitrogen is used as carrier gas, the carrier gas is introduced into a supersonic speed spray gun with the powder supply of 5kg/H, and compressed nitrogen with the pressure of 3.0MPa is used as pushing gas, and the pressure of the carrier gas is 1m3The gas flow rate of/min is fed into supersonic spray gun to form gas-solid dual-phase flow with die steel powder, and the compressed nitrogen is heated to 200 deg.C to increase its gas flow rate, and then passes through narrow throat of nozzle to reach the final productAnd the expansion section is sprayed out after obtaining supersonic speed, and the spray is impacted on the surface of a TC4 matrix which is 10mm away from the nozzle at high speed to form an H13 spray coating with the thickness of 60 mu m. The sprayed layer and the matrix are in a semi-metallurgical bonding state, and the bonding strength can reach 45 MPa.
And mechanically screening out cobalt alloy powder of 200-400 meshes, drying in vacuum for 1H at 100 ℃, naturally cooling, then loading into a coaxial carrier gas powder feeding device, and carrying out laser cladding on the surface of the TC4 plate substrate sprayed with the H13 coating.
The laser power of the semiconductor laser is 800W, the spot diameter is 4mm, and the Ar gas flow is 5L/min. A laser head of a semiconductor laser is aligned to a region to be clad on the surface of an H13 coating on a TC4 plate substrate, a coaxial carrier gas powder feeding device is used for uniformly feeding cladding material cobalt alloy powder to the aligned surface of the laser head, and a laser beam emitted by the laser irradiates the cobalt alloy powder to be melted to form a molten drop. And continuously scanning the region to be clad on the surface of the H13 coating by the semiconductor laser at a scanning speed of 3mm/s according to a set track, wherein the scanning overlap ratio is 30%, and thus obtaining the TC4 plate sample for laser cladding of the cobalt alloy coating on the surface of the H13 coating.
The coating thickness was 3.5mm and the coating hardness was 875.22HV, measured according to the method of example 10.2About, the porosity was 0.72%, and the friction coefficient was 0.21.
Comparative example 3.
The same processing method as example 3 was carried out except that spherical H13 die steel powder was not sprayed on the surface of the TC4 titanium alloy substrate, and a TC4 plate sample with a cobalt alloy coating directly laser-clad on the surface of the substrate was obtained.
The friction coefficient, the hardness and the porosity of the cladding layer were measured according to the test methods of example 1. The detection result shows that the hardness of the cladding layer is only 394.42HV0.2The coefficient of friction was 0.31 and the porosity was 1.02%. It can be seen that the friction coefficient of the cladding layer of example 3 is significantly lower than that of comparative example 3, the hardness is significantly higher than that of comparative example 3, and the coating compactness is significantly higher than that of example 3.

Claims (10)

1. A preparation method of a high-hardness wear-resistant coating on the surface of a titanium alloy substrate comprises the following steps:
1) cleaning and roughening the surface of the titanium alloy substrate, and preheating to 100-300 ℃;
2) carrying out atomization granulation treatment on H13 die steel powder to prepare spherical H13 powder;
3) spraying the spherical H13 powder on the surface of the titanium alloy substrate by adopting a cold air dynamic spraying technology to form an H13 coating with the thickness of 50-105 mu m;
4) and cladding the cobalt alloy powder on the surface of the H13 coating by adopting a laser cladding technology to obtain the cobalt alloy cladding coating.
2. The method for preparing the high-hardness wear-resistant coating on the surface of the titanium alloy substrate according to claim 1, wherein compressed nitrogen is used as carrier gas and pushing gas in the cold gas dynamic spraying technology, the carrier gas is used for introducing the spherical H13 powder into the supersonic speed spray gun, the pushing gas is heated and then enters the supersonic speed spray gun to form gas-solid two-phase flow with the spherical H13 powder, supersonic speed spraying is obtained from a narrow throat part to an expansion section of a supersonic speed spray gun nozzle, and the H13 coating is formed by impacting the titanium alloy substrate surface at high speed.
3. The method for preparing the high-hardness wear-resistant coating on the surface of the titanium alloy substrate according to claim 1 or 2, wherein the granularity of the spherical H13 powder is 10-30 μm.
4. The method for producing a high-hardness wear-resistant coating on a surface of a titanium alloy substrate according to claim 2, wherein the amount of the spherical H13 powder supplied is 5 to 15 kg/hr.
5. The method for preparing the high-hardness wear-resistant coating on the surface of the titanium alloy substrate according to claim 2, wherein the temperature of the propelling gas is controlled to be 250-350 ℃, the pressure is controlled to be 3-4 MPa, and the pressure is controlled to be 1-2 m3The gas flow rate of/min enters the supersonic speed spray gun.
6. The method for preparing the high-hardness wear-resistant coating on the surface of the titanium alloy substrate according to claim 2, wherein the distance between the outlet of the nozzle of the supersonic spray gun and the surface of the titanium alloy substrate is 10-20 mm.
7. The method for preparing the high-hardness wear-resistant coating on the surface of the titanium alloy substrate according to claim 1, wherein the laser cladding process is carried out in an Ar protective gas environment, the laser power is set to be 800-1200W, the diameter of a light spot is set to be 1.5-17 mm, and the cobalt alloy powder is subjected to laser cladding at a laser scanning speed of 3-7 mm/s.
8. The method for preparing a high-hardness wear-resistant coating on the surface of a titanium alloy substrate according to claim 7, wherein the scanning overlap ratio of laser scanning is 30-50%.
9. The method for preparing a high-hardness wear-resistant coating on the surface of a titanium alloy substrate according to claim 1 or 7, wherein the fineness of the cobalt alloy powder is 80-150 meshes.
10. The method for producing a high-hardness wear-resistant coating on a surface of a titanium alloy substrate according to claim 1, wherein the roughening treatment is carried out using a particle size of 16 to 40%#The coarse sand is subjected to sand blasting treatment under the pressure of 0.3-0.7 Mpa.
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