CN113088957B - Method for preparing wear-resistant and high-temperature-resistant coating on surface of titanium alloy through laser cladding - Google Patents
Method for preparing wear-resistant and high-temperature-resistant coating on surface of titanium alloy through laser cladding Download PDFInfo
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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
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- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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Abstract
The invention discloses a method for preparing a wear-resistant and high-temperature-resistant coating on the surface of a titanium alloy by laser cladding, which comprises the following steps: dispersing the carboxylated carbon nano tube in absolute ethyl alcohol, introducing a zirconium source, regulating the pH value of the dispersion liquid, and performing high-pressure hydrothermal reaction in a kettle by utilizing the adsorption effect of the carbon nano tube with functional groups and later-stage roasting decomposition to obtain ZrO 2 Coated on the surface of the CNTs. Prepared ZrO 2 @ CNTs powder and ZrO 2 Powder, CNTs powder, CeO 2 The powder, the titanium powder and the adhesive are mixed according to a certain proportion to form mixed powder in an adhesive state. And uniformly spreading the mixed powder on the surface of the titanium alloy substrate by a preset coating method, drying, and carrying out laser cladding under a certain range of process parameters to obtain a cladding layer for reinforcing the surface of the titanium alloy. The method has simple and safe operation, low cost and high efficiency, and the prepared ZrO 2 The @ CNTs coating enhances the wear resistance and high temperature resistance of the titanium alloy.
Description
Technical Field
The invention belongs to the technical field of material preparation and laser cladding, and particularly relates to a method for laser cladding of a wear-resistant and high-temperature-resistant coating on the surface of a titanium alloy.
Background
The laser cladding technology is a novel material surface modification technology. The high power density of the laser beam is utilized, materials with specific components are added, a cladding layer is formed on the surface of the base material, and the surface performance of the base material is obviously improved. The laser cladding technology has the advantages of small dilution rate, compact structure, metallurgical bonding of the coating and the base material and the like, and is widely applied to the surface modification of the titanium alloy. The titanium alloy has small specific gravity, high strength, low surface hardness and poor wear resistance, and the ceramic particle reinforced composite material coating prepared on the surface of the titanium alloy by laser cladding can improve the performances of wear resistance, corrosion resistance, high temperature resistance, oxidation resistance and the like.
The selection of cladding materials is crucial. The carbon nano tube has light weight, high strength, small size and large specific surface area, and is very suitable for being used as a laser cladding material to enhance the properties of the titanium alloy, such as strength, hardness, wear resistance, thermal stability and the like. However, the structure of the carbon nanotubes is very easily destroyed by the high-energy laser beam. Therefore, the surface of the carbon nano tube is coated with a layer of protective film, so that the structure of the carbon nano tube can be effectively kept stable in laser cladding and is not damaged. Zirconia has the properties of high strength, high melting point, high resistivity, high wear resistance, low thermal expansion coefficient and the like, and is widely applied as a ceramic material.
In the published patent No. CN1673182A entitled "crystal phase controllable zirconium dioxide/carbon nanotube composite powder and preparation method", a hydrothermal in-situ synthesis of zirconium dioxide/carbon nanotube composite powder at a certain temperature by using zirconium oxychloride as a zirconium source is studied. In publication No. CN1724473A entitled "composite toughening material of carbon nanotube/nano zirconia and method for preparing the same", it was studied that different sources of zirconium are added to a CNTs aqueous suspension subjected to surface treatment, a mixture colloid is prepared in a strong alkaline environment, and thereafter zirconia is deposited on the surface of carbon nanotube by high-temperature heating. However, in the above two methods, the carbon nanotubes are dispersed in the aqueous solution, and the dispersibility of the carbon nanotubes in water is poor, which is easily caused by agglomeration, resulting in non-uniform coating of the carbon nanotubes and having certain limitations.
In application publication No. CN105951094A entitled "a method for preparing carbon nanotube reinforced coating by laser cladding", the method for coating carbon nanotubes is too broad to be described, which relates to electroplating, chemical plating, Chemical Vapor Deposition (CVD) and Physical Vapor Deposition (PVD), however, the preparation process, efficiency and result of these methods are not clear, and in addition, the process parameters of laser cladding are very limited and have no guiding significance.
In order to solve the problems, it is necessary to find a method for preparing a reinforced coating by carbon nanotube coating and laser cladding, which is simple to operate, economical and effective.
Disclosure of Invention
The invention aims toProvides a method for preparing a wear-resistant and high-temperature-resistant coating on the surface of a titanium alloy by laser cladding. Adding ZrO on the surface of titanium alloy matrix 2 The @ CNTs powder is radiated by laser beams with specific process parameters to be simultaneously melted with the surface layer of the matrix, and is rapidly solidified to form a cladding layer which is metallurgically bonded with the titanium alloy matrix and enhances the wear resistance and high temperature resistance of the titanium alloy matrix. The method has the advantages that: chemical coating ZrO of CNTs by alcohol thermochemical reaction method 2 The structural stability of the CNTs powder is protected; the laser cladding precision is high, efficient, the controllability is good, and the customization nature of the cladding layer of preparation is strong, with low costs, efficient.
The invention is realized by the following technical scheme:
a method for preparing a wear-resistant and high-temperature-resistant coating on the surface of a titanium alloy by laser cladding comprises the following steps:
1) preparation of surface-coated tetragonal-phase ZrO by alcohol thermochemical reaction 2 Carbon nanotube (ZrO) 2 @CNTs)；
2) Using step 1) to coat tetragonal phase ZrO 2 Preparing raw material powder of a cladding layer by using the carbon nano tube, and adding a powder adhesive to obtain mixed powder in an adhesive state;
3) spreading the mixed powder in the adhesive state obtained in the step 2) on the surface of the titanium alloy substrate, drying, and preparing the wear-resistant and high-temperature-resistant coating on the surface of the titanium alloy by laser cladding.
Further, the alcohol thermochemical reaction of step 1) comprises the following steps:
firstly, ZrOCl 2 ·8H 2 Dissolving O powder in absolute ethyl alcohol, and performing ultrasonic dispersion at room temperature to obtain ZrOCl 2 Ethanol solution;
dispersing the carboxylated carbon nanotubes in absolute ethyl alcohol at 40-60 deg.c;
thirdly, ZrOCl obtained in the step I is added into the carbon nano tube ethanol dispersion liquid obtained in the step II 2 Ethanol solution and magnetic stirring;
adding glycerol into the mixed solution after stirring in the step (III), magnetically stirring, and adjusting the pH to 9-12 by using a pH regulator after stirring;
fifthly, leading the mixed solution after the pH is adjusted in the step IV into a hydrothermal reaction kettle with a PPL material as a lining, and placing the hydrothermal reaction kettle in a temperature field of 180 ℃ and 280 ℃ for heat preservation for 12-24 hours;
sixthly, after the temperature is preserved, the mixture is filtered for 1 to 3 times in vacuum, the solid mixture is taken out, dried in vacuum and roasted to obtain the ZrO with the surface coated with the tetragonal phase 2 The carbon nanotube of (2).
Further, step (i) is to form ZrOCl 2 ·8H 2 The volume ratio of the O powder to the absolute ethyl alcohol is 1: (15-30), g/mL.
Further, the volume ratio of the mass of the carboxylated carbon nanotube to the absolute ethyl alcohol is 1: (140-200), g/mL.
Step III of ZrOCl 2 The addition amount of ethanol solution is based on ZrO 2 Takes up surface to coat tetragonal phase ZrO 2 The specific gravity of the carbon nano tube is 10 wt.% to 30 wt.%.
Furthermore, the addition amount of the glycerol in the step (iv) is determined according to the glycerol and the ZrOCl 2 The concentration ratio of (6-10): 1, measuring; the pH regulator is 1mol/L NaOH/ethanol solution.
And further, the mixed solution is led into a hydrothermal reaction kettle with a PPL material as a lining, and the mixed solution accounts for 50-80% of the volume of the hydrothermal reaction kettle.
Further, the vacuum drying temperature is 60-80 ℃ and the time is 12-24 h; the roasting temperature is 350-450 ℃, and the time is 2-3 h.
Further, the raw material powder of the cladding layer in the step 2) comprises the following components in percentage by mass: zirconia 5-10%, surface coated tetragonal phase ZrO 2 6 to 12 percent of carbon nano tube, 0.5 to 1.5 percent of carbon nano tube powder, 0.5 to 1.5 percent of cerium oxide and the balance of titanium powder.
Further, the powder adhesive in the step 2) is a mixture of 3% polyvinyl alcohol aqueous solution and glycerol according to the weight ratio of 1: (1-2) preparing.
Further, the adding amount of the powder binder in the step 2) accounts for 3% -7% of the total volume of the mixture of the raw material powder and the powder binder.
Further, the mixed powder in the adhesive state in the step 3) is spread on the titanium alloy substrate to be 0.4-1.0mm in thickness.
Further, before the titanium alloy matrix in the step 3) is spread, sequentially polishing with 800#, 1500# and 2000# abrasive paper, and after the titanium alloy matrix is spread with the adhesive mixed powder, drying in vacuum for 4-8h at 40-60 ℃.
Further, the laser cladding process parameters in the step 3) are as follows: the laser power is 0.8-1.2kW, the scanning speed is 4-8mm/s, the spot diameter is 3-7mm, the lap-joint rate is 40-50%, the protective gas is argon, and the gas flow is 15-25L/min.
Compared with the prior art, the invention has the beneficial effects that:
(1) chemical ZrO coating of CNTs by alcohol thermochemical reaction method 2 The structural stability of the CNTs powder is protected; (2) the ultrasonic treatment is carried out on the mixed powder, so that the nonuniformity caused by the mixed powder is reduced, and the generation of pores of a cladding layer is favorably reduced; (3) the experimental method is simple to operate, low in risk coefficient, strong in repeatability, environment-friendly and pollution-free; (4) the cladding layer and the titanium alloy matrix have good metallurgical bonding, the cladding layer has uniform tissue, and the wear resistance and high temperature resistance of the titanium alloy in use are greatly improved.
Detailed Description
The present invention will be further described with reference to specific examples, but the present invention is not limited to the following examples. The process is conventional unless otherwise specified, and the starting materials are commercially available from the open literature.
Example 1
(1) 3.22g of ZrOCl 2 ·8H 2 Dissolving O powder in 50mL of absolute ethyl alcohol, and ultrasonically dispersing for 30min at room temperature to prepare ZrOCl 2 The ethanol solution is used as a precursor of zirconium.
(2) 0.5g of carboxylated Carbon Nanotube (CNTs) powder is added into 70mL of absolute ethyl alcohol, and is subjected to ultrasonic pre-dispersion for 60min at the temperature of 60 ℃, and no water vapor is controlled in the dispersion process.
(3) Taking a proper amount of ZrOCl prepared in the step (1) 2 Adding the ethanol solution into the CNTs ethanol dispersion liquid pre-dispersed in the step (2), and continuously performing magnetic stirring during adding，ZrOCl 2 The addition amount of the ethanol solution is based on ZrO 2 Occupied of ZrO 2 The specific gravity of the @ CNTs is 30 wt.% measured; after the addition, the magnetic stirring was continued for 30 min.
(4) Adding a proper amount of glycerol into the mixed solution stirred in the step (3), and continuously performing magnetic stirring during adding, wherein the adding amount of the glycerol is determined according to the glycerol and the ZrOCl 2 The concentration ratio of (A) to (B) is 10: 1; after the addition, the magnetic stirring was continued for 30 min.
(5) And (3) adding a proper amount of 1mol/L NaOH/ethanol solution into the mixed solution obtained in the step (4), adjusting the pH value of the mixed solution to 12, and continuously performing magnetic stirring during addition.
(6) And (3) introducing the mixed solution obtained in the step (5) into a hydrothermal reaction kettle with a PPL material as a lining, wherein the volume of the mixed solution accounts for 80% of that of the hydrothermal reaction kettle, and placing the hydrothermal reaction kettle in a 280 ℃ temperature field for heat preservation for 24 hours.
(7) And (4) carrying out vacuum filtration on the mixed solution subjected to heat preservation in the step (6) for 3 times under an organic microporous filter membrane, and taking out a solid mixture.
(8) And (4) putting the solid mixture obtained in the step (7) into a vacuum drying oven for drying treatment, wherein the drying temperature is 80 ℃, and the drying time is 24 hours.
(9) Placing the solid mixture dried in the step (8) in a vacuum heat treatment furnace for high-temperature roasting at 450 ℃ for 3 hours to obtain the ZrO with the surface coated with the tetragonal phase 2 Carbon nanotube (ZrO) 2 @ CNTs) powder.
(10) Preparing raw material powder of the cladding layer according to the following mixture ratio: 10 wt.% zirconia powder (particle size 40-100nm), 12 wt.% ZrO 2 @ CNTs powder, 1.5 wt.% cerium oxide powder (particle size of 20-40nm), and the balance titanium powder (particle size of 15-45 μm), and mechanically mixing the powders uniformly. 3 wt.% aqueous PVA solution and glycerol were mixed as 1: 2, adding the adhesive into the mixed powder, wherein the adhesive accounts for 7 percent of the total volume, and then carrying out ultrasonic dispersion treatment on the mixture for 1.5 hours to obtain the mixed powder in an adhesive state.
(11) Sequentially polishing the titanium alloy matrix by using 800#, 1500# and 2000# sandpaper respectively, cleaning by using absolute ethyl alcohol and drying for later use. And (3) uniformly spreading the sticky powder prepared in the step (10) on the surface of the titanium alloy substrate, controlling the thickness of the prefabricated powder layer to be 1.0mm, and then putting the titanium alloy substrate into a vacuum drying oven for drying treatment at the drying temperature of 60 ℃ for 8 hours.
(12) Preparing a plurality of wear-resistant and high-temperature-resistant coatings on the surface of the titanium alloy by using a laser cladding technology, wherein the technological parameter range is as follows: the laser power is 1.2kW, the scanning speed is 8mm/s, the spot diameter is 7mm, the lap-joint rate is 50%, the protective gas is argon, and the gas flow is 25L/min.
Under the condition of the embodiment, the titanium alloy prepared by laser cladding has the advantages of compact structure of the wear-resistant and high-temperature-resistant coating on the surface, no obvious crack and the like. The abrasion tests are carried out on the substrate and the cladding layer, the load is 300N, the rotating speed is 500r/min, the abrasion time is 40min, the abrasion temperatures are room temperature and 800 ℃, respectively, and the experimental results show that the friction coefficient of the cladding layer is respectively reduced by 24.9 percent and 32.1 percent compared with that of the substrate.
Example 2
(1) 1.61g of ZrOCl 2 ·8H 2 Dissolving O powder in 50mL of absolute ethyl alcohol, and ultrasonically dispersing for 15min at room temperature to prepare ZrOCl 2 The ethanol solution is used as a precursor of zirconium.
(2) 0.25g of carboxylated Carbon Nanotube (CNTs) powder is added into 50mL of absolute ethyl alcohol, and is subjected to ultrasonic pre-dispersion for 30min at 40 ℃, and no water vapor is controlled in the dispersion process.
(3) Taking a proper amount of ZrOCl prepared in the step (1) 2 Adding ethanol solution into the CNTs ethanol dispersion liquid pre-dispersed in the step (2), and continuously performing magnetic stirring during adding, wherein ZrOCl 2 The addition amount of the ethanol solution is based on ZrO 2 Is ZrO 2 Specific gravity of the @ CNTs is 10 wt.% measured; after the addition, the magnetic stirring was continued for another 15 min.
(4) Adding a proper amount of glycerol into the mixed solution stirred in the step (3), and continuously performing magnetic stirring during adding, wherein the adding amount of the glycerol is determined according to the glycerol and ZrOCl 2 The concentration ratio of (A) to (B) is 6: 1; after the addition, magnetic stirring was continued for 15 min.
(5) And (3) adding a proper amount of 1mol/L NaOH/ethanol solution into the mixed solution obtained in the step (4), adjusting the pH value of the mixed solution to 9, and continuously performing magnetic stirring during addition.
(6) And (3) introducing the mixed solution obtained in the step (5) into a hydrothermal reaction kettle with a PPL material as a lining, wherein the volume of the mixed solution accounts for 50% of the volume of the hydrothermal reaction kettle, and placing the hydrothermal reaction kettle in a temperature field of 180 ℃ for heat preservation for 12 hours.
(7) And (4) carrying out vacuum filtration on the mixed solution subjected to heat preservation in the step (6) for 1 time under an organic microporous filter membrane, and taking out a solid mixture.
(8) And (5) placing the solid mixture obtained in the step (7) in a vacuum drying oven for drying treatment, wherein the drying temperature is 60 ℃, and the drying time is 12 hours.
(9) Placing the solid mixture dried in the step (8) in a vacuum heat treatment furnace for high-temperature roasting at 350 ℃ for 2 hours to obtain the surface-coated tetragonal-phase ZrO 2 Carbon nanotube (ZrO) 2 @ CNTs) powder.
(10) Preparing raw material powder of the cladding layer according to the following mixture ratio: 5 wt.% zirconia powder (particle size 40-100nm), 6 wt.% ZrO 2 @ CNTs powder, 0.5 wt.% cerium oxide powder (particle size of 20-40nm), and the balance titanium powder (particle size of 15-45 μm), and mechanically mixing the powders uniformly. 3 wt.% aqueous PVA solution and glycerol were mixed as 1: 1, adding the adhesive into the mixed powder, wherein the adhesive accounts for 3% of the total volume, and then carrying out ultrasonic dispersion treatment on the mixture for 0.5h to obtain the mixed powder in an adhesive state.
(11) Sequentially polishing the titanium alloy matrix by using 800#, 1500# and 2000# sandpaper respectively, cleaning by using absolute ethyl alcohol and drying for later use. And (5) uniformly spreading the sticky powder prepared in the step (10) on the surface of the titanium alloy substrate, controlling the thickness of the prefabricated powder layer to be 0.4mm, and then putting the titanium alloy substrate into a vacuum drying oven for drying treatment, wherein the drying temperature is 40 ℃ and the drying time is 4 hours.
(12) Preparing a plurality of wear-resistant and high-temperature-resistant coatings on the surface of the titanium alloy by using a laser cladding technology, wherein the technological parameter range is as follows: the laser power is 0.8kW, the scanning speed is 4mm/s, the spot diameter is 3mm, the lap-joint rate is 40%, the protective gas is argon, and the gas flow is 15L/min.
Under the condition of the embodiment, the titanium alloy surface wear-resistant and high-temperature-resistant coating prepared by laser cladding has compact structure and no obvious defects such as cracks and the like. The abrasion tests are carried out on the substrate and the cladding layer, the load is 300N, the rotating speed is 500r/min, the abrasion time is 40min, the abrasion temperatures are room temperature and 800 ℃, respectively, and the experimental results show that the friction coefficient of the cladding layer is respectively reduced by 23.6 percent and 30.8 percent compared with that of the substrate.
Example 3
(1) 2.415g of ZrOCl 2 ·8H 2 Dissolving O powder in 50mL of absolute ethyl alcohol, and ultrasonically dispersing for 20min at room temperature to prepare ZrOCl 2 The ethanol solution is used as a precursor of zirconium.
(2) 0.375g of carboxylated Carbon Nanotube (CNTs) powder is added into 60mL of absolute ethyl alcohol, and is subjected to ultrasonic pre-dispersion for 45min at 50 ℃, and the water vapor is controlled in the dispersion process.
(3) Taking a proper amount of ZrOCl prepared in the step (1) 2 Adding ethanol solution into the CNTs ethanol dispersion liquid pre-dispersed in the step (2), and continuously performing magnetic stirring during adding, wherein ZrOCl 2 The addition amount of the ethanol solution is based on ZrO 2 Is ZrO 2 The specific gravity of the @ CNTs is measured in 20 wt.%; after the addition, the magnetic stirring was continued for another 20 min.
(4) Adding a proper amount of glycerol into the mixed solution stirred in the step (3), and continuously performing magnetic stirring during adding, wherein the adding amount of the glycerol is determined according to the glycerol and ZrOCl 2 The concentration ratio of (A) to (B) is 8: 1; after the addition, the magnetic stirring was continued for another 20 min.
(5) And (5) adding a proper amount of 1mol/L NaOH/ethanol solution into the mixed solution obtained in the step (4), adjusting the pH value of the mixed solution to 10, and continuously performing magnetic stirring during addition.
(6) And (3) introducing the mixed solution obtained in the step (5) into a hydrothermal reaction kettle with a PPL material as a lining, wherein the volume of the mixed solution accounts for 65% of that of the hydrothermal reaction kettle, and placing the hydrothermal reaction kettle in a 230 ℃ temperature field for heat preservation for 18 h.
(7) And (4) carrying out vacuum filtration on the mixed solution subjected to heat preservation in the step (6) for 2 times under an organic microporous filter membrane, and taking out a solid mixture.
(8) And (4) putting the solid mixture obtained in the step (7) into a vacuum drying oven for drying treatment, wherein the drying temperature is 70 ℃, and the drying time is 18 hours.
(9) Placing the solid mixture dried in the step (8) in a vacuum heat treatment furnace for high-temperature roasting at 400 ℃ for 2.5 hours to obtain the surface-coated tetragonal-phase ZrO 2 Carbon nanotube (ZrO) 2 @ CNTs) powder.
(10) Preparing raw material powder of the cladding layer according to the following mixture ratio: 7.5 wt.% zirconia powder (particle size 40-100nm), 8 wt.% ZrO 2 @ CNTs powder, 1 wt.% cerium oxide powder (particle size of 20-40nm), and the balance titanium powder (particle size of 15-45 μm), and mechanically mixing the powders uniformly. 3 wt.% aqueous PVA solution and glycerol were mixed as 1: 1.5, adding the adhesive into the mixed powder, wherein the adhesive accounts for 5 percent of the total volume, and then carrying out ultrasonic dispersion treatment on the mixture for 1.0 hour to obtain the mixed powder in an adhesive state.
(11) Sequentially polishing the titanium alloy matrix by using 800#, 1500# and 2000# sandpaper respectively, cleaning by using absolute ethyl alcohol and drying for later use. And (3) uniformly spreading the sticky powder prepared in the step (10) on the surface of the titanium alloy substrate, controlling the thickness of the prefabricated powder layer to be 0.7mm, and then putting the titanium alloy substrate into a vacuum drying oven for drying treatment at the drying temperature of 50 ℃ for 6 hours.
(12) Preparing a plurality of wear-resistant and high-temperature-resistant coatings on the surface of the titanium alloy by using a laser cladding technology, wherein the technological parameter range is as follows: the laser power is 1.0kW, the scanning speed is 6mm/s, the spot diameter is 5mm, the lap joint rate is 45%, the protective gas is argon, and the gas flow is 20L/min.
Under the condition of the embodiment, the titanium alloy surface wear-resistant and high-temperature-resistant coating prepared by laser cladding has compact structure and no obvious defects such as cracks and the like. The abrasion tests are carried out on the substrate and the cladding layer, the load is 300N, the rotating speed is 500r/min, the abrasion time is 40min, the abrasion temperatures are room temperature and 800 ℃, respectively, and the experimental results show that the friction coefficient of the cladding layer is respectively reduced by 24.7 percent and 31.5 percent compared with that of the substrate.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the principle of the present invention, and these modifications and variations should also be considered as included in the protection scope of the present invention.
Claims (9)
1. A method for preparing a wear-resistant and high-temperature-resistant coating on the surface of a titanium alloy by laser cladding is characterized by comprising the following steps:
1) preparation of surface-coated tetragonal-phase ZrO by alcohol thermochemical reaction 2 The carbon nanotube of (2);
2) using step 1) to coat tetragonal phase ZrO 2 Preparing raw material powder of a cladding layer by using the carbon nano tube, and adding a powder adhesive to obtain mixed powder in an adhesive state;
wherein the raw material powder of the cladding layer comprises the following components in percentage by mass: zirconia 5-10%, surface coated tetragonal phase ZrO 2 6 to 12 percent of carbon nano tube, 0.5 to 1.5 percent of carbon nano tube powder, 0.5 to 1.5 percent of cerium oxide and the balance of titanium powder;
3) spreading the mixed powder in the adhesive state obtained in the step 2) on the surface of the titanium alloy substrate, drying, and preparing the wear-resistant and high-temperature-resistant coating on the surface of the titanium alloy by laser cladding.
2. The method for preparing the wear-resistant and high-temperature-resistant coating on the surface of the titanium alloy by laser cladding according to claim 1, wherein the alcohol thermochemical reaction in the step 1) comprises the following steps:
firstly, ZrOCl 2 ·8H 2 Dissolving O powder in absolute ethyl alcohol, and performing ultrasonic dispersion at room temperature to obtain ZrOCl 2 Ethanol solution;
dispersing the carboxylated carbon nanotubes in absolute ethyl alcohol at 40-60 deg.c;
thirdly, adding ZrOCl obtained in the step I into the carbon nano tube ethanol dispersion liquid obtained in the step II 2 Ethanol solution and magnetic stirring;
fourthly, adding glycerol into the mixed solution after stirring in the third step, magnetically stirring, and adjusting the pH to 9-12 by adopting a pH regulator after stirring;
fifthly, leading the mixed solution after the pH is adjusted in the step IV into a hydrothermal reaction kettle with a PPL material as a lining, and placing the hydrothermal reaction kettle in a temperature field of 180 ℃ and 280 ℃ for heat preservation for 12-24 hours;
sixthly, after the temperature is preserved, the mixture is filtered for 1 to 3 times in vacuum, the solid mixture is taken out, dried in vacuum and roasted to obtain the ZrO with the surface coated with the tetragonal phase 2 The carbon nanotube of (2).
3. The method for preparing the wear-resistant and high-temperature-resistant coating on the surface of the titanium alloy by laser cladding according to claim 2, wherein the ZrOCl is prepared in step three 2 The addition amount of the ethanol solution is based on ZrO 2 Occupying surface coated tetragonal phase ZrO 2 The specific gravity of the carbon nano tube is 10 wt.% to 30 wt.%.
4. The method for preparing the wear-resistant and high-temperature-resistant coating on the surface of the titanium alloy by laser cladding as claimed in claim 2, wherein the addition amount of the glycerol in the step (iv) is determined according to the glycerol and the ZrOCl 2 The concentration ratio of (6-10): measuring 1 amount.
5. The method for preparing the wear-resistant and high-temperature-resistant coating on the surface of the titanium alloy by laser cladding as claimed in claim 2, wherein the roasting temperature is 350-450 ℃ and the roasting time is 2-3 h.
6. The method for preparing the wear-resistant and high-temperature-resistant coating on the surface of the titanium alloy by laser cladding according to claim 1, wherein the powder binder in the step 2) is a 3% polyvinyl alcohol aqueous solution and glycerol, and the weight ratio of the polyvinyl alcohol aqueous solution to the glycerol is 1: (1-2) preparing.
7. The method for preparing the wear-resistant and high-temperature-resistant coating on the surface of the titanium alloy by laser cladding according to claim 1, wherein the addition amount of the powder binder in the step 2) is 3-7% of the total volume of the mixture of the raw material powder and the powder binder.
8. The method for preparing the wear-resistant and high-temperature-resistant coating on the surface of the titanium alloy by laser cladding according to claim 1, wherein the mixed powder in the adhesive state in the step 3) is spread on the titanium alloy substrate to a thickness of 0.4-1.0 mm.
9. The method for preparing the wear-resistant and high-temperature-resistant coating on the surface of the titanium alloy by laser cladding according to claim 1, wherein the laser cladding process parameters in the step 3) are as follows: the laser power is 0.8-1.2kW, the scanning speed is 4-8mm/s, the spot diameter is 3-7mm, the lap joint rate is 40-50%, the protective gas is argon, and the gas flow is 15-25L/min.
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