Oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy and preparation method thereof
By using laser cladding of h-BN@TiO2 and a mixture of TiO2 and CuO powders on the surface of titanium alloys, a wear-resistant and self-lubricating coating is formed, which solves the problems of low hardness and poor oxygen wettability of titanium alloys. The microhardness and wear resistance are greatly improved, and high-efficiency wear resistance is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
- Filing Date
- 2023-04-10
- Publication Date
- 2026-05-12
AI Technical Summary
Titanium alloys have low hardness and poor wear resistance, which limits their application in military equipment and other fields. In addition, the poor wettability of oxygen element and the presence of many pore defects during laser cladding affect the wear resistance of the coating.
Laser cladding was performed using h-BN@TiO2 and a mixture of TiO2 and CuO powders. Oxygen was introduced as a hard phase to form a wear-resistant and self-lubricating coating. The core-shell structure of h-BN@TiO2 reduced decomposition, and CuO was combined to reduce cladding power and avoid porosity cracks.
With a microhardness of 1700HV0.2, the coefficient of friction is reduced, the coating is metallurgically bonded to the substrate, and the wear resistance is significantly improved, reducing wear by 90.3%-93.1%.
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Figure CN116497350B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of laser cladding technology, specifically relating to an oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy and its preparation method. Background Technology
[0002] Titanium alloys are widely used in aerospace, marine engineering, and biomedicine due to their high specific strength, good corrosion resistance, and good biocompatibility. However, titanium alloys suffer from low hardness and poor wear resistance, which limits their application, especially in the field of lightweight military equipment. Large-scale use of titanium alloys would significantly improve the combat capabilities of military equipment.
[0003] Laser cladding technology refers to a coating preparation technique that uses high-temperature laser light to fuse cladding materials onto the surface of a substrate, forming a metallurgically bonded cladding layer. Therefore, laser cladding technology has been widely used in the repair and remanufacturing of worn and corroded parts of various mechanical equipment. However, with the increase of the hard phase content in the cladding powder, the coefficient of friction of the coating increases, leading to more cracks and porosity defects, which limits further improvement in the wear resistance of laser cladding coatings. Furthermore, due to the poor wettability of oxygen and its tendency to generate porosity during laser cladding, various oxygen-containing substances are difficult to use as cladding powders. Summary of the Invention
[0004] To address the aforementioned problems, this invention provides an oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy and its preparation method, which can improve the wear resistance of titanium alloys and expand their application range.
[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:
[0006] A method for preparing an oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy includes mixing raw materials h-BN@TiO2, TiO2 and CuO to obtain a mixed powder, then spreading the mixed powder on the surface of the titanium alloy, and using a laser cladding device in air to laser clad the titanium alloy with the mixed powder to obtain the alloy.
[0007] The mass percentages of each component in the raw material are as follows: TiO2: 92-98 wt%, h-BN@TiO2: 1-10 wt%, CuO: 1-2 wt%.
[0008] Furthermore, the thickness of the powder coating is 1 to 1.5 mm.
[0009] Furthermore, the mass percentages of the components of the raw material are as follows: TiO2: 94wt%, h-BN@TiO2: 5wt%, CuO: 1wt%.
[0010] Furthermore, the preparation method of h-BN@TiO2 includes adding h-BN with tetrabutyl titanate and polyvinylpyrrolidone to an ethanol solution for ultrasonic mixing, then adding ammonia to the ultrasonically treated mixture and carrying out a hydrothermal reaction, then centrifuging, washing and drying the resulting solution to obtain a powder, and finally placing the obtained powder in a tube furnace and keeping it at a constant temperature in an argon atmosphere to obtain h-BN@TiO2.
[0011] Furthermore, the weight percentages of the raw materials for preparing h-BN@TiO2 are as follows: 80-83 wt% ethanol solution, 2-4 wt% h-BN, 4-6 wt% tetrabutyl titanate, 2-5 wt% polyvinylpyrrolidone, and 2-12 wt% ammonia.
[0012] Furthermore, the mixing process includes placing TiO2, h-BN@TiO2 and CuO in a ball mill and ball milling at a speed of 200-250 r / min, a ball-to-material ratio of 4:1, a ball milling time of 30-60 min, and drying at a temperature of 70℃ for 2-3 h.
[0013] Furthermore, the laser cladding equipment is a semiconductor fiber-coupled laser with a wavelength of 1080nm, a rectangular laser spot of 15mm×2mm, a laser cladding power of 1500~2000W, and a scanning speed of 1~2mm / s.
[0014] Furthermore, this includes the following steps:
[0015] Step 1: Preparation of h-BN@TiO2
[0016] h-BN was added to an ethanol solution and ultrasonically mixed with tetrabutyl titanate and polyvinylpyrrolidone. Then, ammonia was added to the ultrasonically treated mixture and a hydrothermal reaction was carried out. The resulting solution was then centrifuged, washed, and dried to obtain a powder. Finally, the powder was placed in a tube furnace and kept at a temperature in an argon atmosphere to obtain h-BN@TiO2.
[0017] Step 2: Mixing and drying powder
[0018] TiO2, h-BN@TiO2 and CuO were placed in a ball mill and ball milled at a speed of 200 r / min, a ball-to-material ratio of 4:1 and a ball milling time of 60 min. Then, they were dried at a temperature of 70℃ for 2 h.
[0019] Step 3, Spread powder
[0020] The dried powder mixture from step 2 is pressed onto the surface of the titanium alloy to obtain a pre-coating with a thickness of 1 mm.
[0021] Step 4: Perform laser cladding
[0022] The titanium alloy containing the pre-coated layer in step 3 is obtained by performing a single-pass laser cladding in air using a laser cladding equipment.
[0023] The laser cladding equipment is a semiconductor fiber-coupled laser with a wavelength of 1080nm and a rectangular laser spot of 15mm×2mm. The laser process parameters are a laser cladding power of 1500W and a scanning speed of 1.5mm / s.
[0024] Furthermore, the weight percentages of the raw materials used to prepare h-BN@TiO2 in step 1 are as follows: 80-83 wt% ethanol solution, 2-4 wt% h-BN, 4-6 wt% tetrabutyl titanate, 2-5 wt% polyvinylpyrrolidone, and 2-12 wt% ammonia.
[0025] In step 2, the mass percentages of each component in the raw material are: TiO2: 94wt%, h-BN@TiO2: 5wt%, CuO: 1wt%.
[0026] This invention also discloses an oxygen-consuming laser-clad wear-resistant self-lubricating titanium alloy, prepared using any of the preparation methods for oxygen-consuming laser-clad wear-resistant self-lubricating titanium alloys described in this invention. The microhardness of the titanium alloy is 1500–1700 HV. 0.2 .
[0027] Compared with the prior art, the present invention has the following technical advantages:
[0028] 1. This invention creatively introduces oxygen into laser cladding powder, making oxygen a hard phase component, thus avoiding defects such as pores and cracks caused by poor wettability of oxygen. This eliminates the need for inert gas protection during the laser cladding process and broadens the selection range of laser cladding materials.
[0029] 2. The wear-resistant self-lubricating coating prepared on the surface of titanium alloy by this invention enables the microhardness of the titanium alloy to exceed 1700 HV. 0.2 Meanwhile, TiO2 with a core-shell coating structure is introduced into the cladding powder to coat h-BN powder, which reduces the amount of self-lubricating phase h-BN decomposition during the cladding process. The hard phase and the self-lubricating phase work together to form a lubricating film on the titanium alloy matrix, reduce the friction coefficient, inhibit the peeling of hard phase particles, and further improve the wear resistance of the coating. Attached Figure Description
[0030] Figure 1 The macroscopic morphology of the titanium alloys prepared in Examples 1, 2 and Comparative Examples 1, 2, 3;
[0031] Figure 2 The graphs show the changes in microhardness in Examples 1 and 2.
[0032] Figure 3Scanning electron microscope images of Examples 1 and 2;
[0033] Figure 4 XRD patterns of Examples 1 and 2;
[0034] Figure 5 The friction coefficient diagrams for Examples 1 and 2 are shown.
[0035] Figure 6 The wear diagrams are for Examples 1 and 2. Detailed Implementation
[0036] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0037] The preparation method of oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy of the present invention includes mixing raw materials h-BN@TiO2, TiO2 and CuO to obtain mixed powder, then spreading the mixed powder on the surface of titanium alloy, and laser cladding the titanium alloy with mixed powder in air using a laser cladding device to obtain the alloy.
[0038] The mass percentages of each component in the raw material are: TiO2: 92–98 wt%, h-BN@TiO2: 1–10 wt%, CuO: 1–2 wt%. The powder coating thickness is 1–1.5 mm.
[0039] Preferably, the mass percentages of the components of the raw material are: TiO2: 94wt%, h-BN@TiO2: 5wt%, CuO: 1wt%.
[0040] The titanium alloy used in this invention is TC4 titanium alloy, with the following chemical composition (by mass percentage): Al 5.5~6.8V; 3.5~4.5; Fe≤0.30; O≤0.20; C≤0.08; N≤0.05; H≤0.015; balance is Ti.
[0041] The preparation method of h-BN@TiO2 of the present invention includes adding h-BN with tetrabutyl titanate and polyvinylpyrrolidone into an ethanol solution for ultrasonic mixing, then adding ammonia water to the ultrasonically treated mixed solution and carrying out a hydrothermal reaction, then centrifuging, washing and drying the resulting solution to obtain a powder, and finally placing the obtained powder in a tube furnace and keeping it at a temperature in an argon atmosphere to obtain h-BN@TiO2.
[0042] Example 1:
[0043] This embodiment discloses a method for preparing an oxygen-consuming titanium alloy surface oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy, including the following steps:
[0044] Step 1: Preparation of h-BN@TiO2
[0045] h-BN was added to an ethanol solution and ultrasonically mixed with tetrabutyl titanate and polyvinylpyrrolidone. Then, ammonia was added to the ultrasonically treated mixture and a hydrothermal reaction was carried out. The resulting solution was then centrifuged, washed, and dried to obtain a powder. Finally, the powder was placed in a tube furnace and kept at a temperature in an argon atmosphere to obtain h-BN@TiO2.
[0046] Specifically, h-BN powder was placed in an ethanol solution and sonicated for 10 min. Then, tetrabutyl titanate and polyvinylpyrrolidone were added to the ethanol solution, and the mixture was sonicated for another 10 min. A suitable amount of ammonia was slowly added to the sonicated mixture, and the mixture was sonicated for 15 min. The mixture was then placed in a reaction vessel and kept at 135℃ in a muffle furnace for 14 h. The resulting solution was then centrifuged (2500 rpm; time: 25 min) to obtain a precipitate, which was washed with an ethanol solution. The washed precipitate was then dried in a drying oven at 75℃ for 4 h to obtain a powder. Finally, the obtained powder was placed in a tube furnace and kept at 425℃ in an argon atmosphere for 2.5 h to obtain h-BN@TiO2.
[0047] The raw materials for preparing h-BN@TiO2 are as follows by weight percentage: 80-83 wt% ethanol solution, 2-4 wt% h-BN, 4-6 wt% tetrabutyl titanate, 2-5 wt% polyvinylpyrrolidone, and 2-12 wt% ammonia.
[0048] Step 2: Mixing and drying powder
[0049] TiO2, h-BN@TiO2, and CuO were ball-milled at 200 r / min with a ball-to-material ratio of 4:1 for 60 min, followed by drying at 70℃ for 2 h. The mass percentages of the raw materials were: TiO2: 98 wt%, h-BN@TiO2: 1 wt%, and CuO: 1 wt%. The powder dimensions were: TiO2 ≤ 50 nm and CuO ≤ 50 nm.
[0050] Step 3, Spread powder
[0051] The dried powder mixture from step 2 is pressed onto the surface of the titanium alloy to obtain a pre-coating with a thickness of 1 mm.
[0052] Step 4: Perform laser cladding
[0053] The titanium alloy containing the pre-coated material from step 3 is obtained by single-pass laser cladding in air using a laser cladding device; the TC4 titanium alloy is cut using a wire cutting machine, and the size of the cut TC4 titanium alloy is 100mm×40mm×6mm.
[0054] The laser cladding equipment is a semiconductor fiber-coupled laser with a wavelength of 1080nm and a rectangular laser spot of 15mm×2mm. The laser process parameters are a laser cladding power of 1500W and a scanning speed of 1.5mm / s.
[0055] The addition of CuO in this embodiment lowers the melting point of the cladding powder system, allowing for the use of a lower laser power (1500W). The resulting coating exhibits a smoother macroscopic morphology without cracks. Figure 1 As shown. The microhardness change of the coating was tested using a microhardness tester, as shown. Figure 2 As shown, the coating in Example 1 has a microhardness of up to 1700 HV. 0.2 Scanning electron microscopy revealed a tight bond between the coating and the substrate, with no pores or cracks present. Figure 3 As shown. Meanwhile, based on XRD phase analysis, as... Figure 4 As shown, the coating mainly consists of TiO, TiO2 and TiO2. X N Y The presence of a hard phase further indicates that oxygen can be used as a coating component without the need for oxygen isolation. However, the h-BN@TiO2 content is too low, and coupled with the high-temperature decomposition effect of laser, BN cannot be observed in the XRD pattern.
[0056] A ball-and-disc friction test was conducted using a room-temperature tribometer. The load was 10 N, the rotation radius was 3 mm, the rotation speed was 150 r / min, the friction pair consisted of 6 mm Si3N4 ceramic balls, and the friction time was 30 min. Changes in wear mass before and after the experiment were recorded using an electronic balance. The coefficient of friction of the coating and the wear mass of the coating are shown below. Figure 5 As shown, the results indicate that during dry friction, the coefficient of friction of the coating increases rapidly with increasing friction time, eventually stabilizing at 0.51. However, by comparing the changes in sample mass before and after friction, it was found that after 30 minutes of friction, the coefficient of friction decreased significantly. Figure 6 As shown, the wear amount of Example 1 was 0.34 mg, which was 90.3% less than that of the TC4 matrix (3.5 mg). Therefore, Example 1 has excellent anti-wear properties.
[0057] In summary, the laser cladding coating with the following raw material composition by mass percentage: TiO2: 98wt%, 1wt% h-BN@TiO2, CuO: 1wt% exhibits no defects such as cracks or pores, and forms a metallurgical bond with the substrate; it also possesses extremely high microhardness and good wear resistance.
[0058] Example 2
[0059] Step 1: Preparation of h-BN@TiO2
[0060] h-BN was added to an ethanol solution and ultrasonically mixed with tetrabutyl titanate and polyvinylpyrrolidone. Then, ammonia was added to the ultrasonically treated mixture and a hydrothermal reaction was carried out. The resulting solution was then centrifuged, washed, and dried to obtain a powder. Finally, the powder was placed in a tube furnace and kept at a temperature in an argon atmosphere to obtain h-BN@TiO2.
[0061] Specifically, h-BN powder was placed in an ethanol solution and sonicated for 10 min. Then, tetrabutyl titanate and polyvinylpyrrolidone were added to the ethanol solution, and the mixture was sonicated for another 10 min. A suitable amount of ammonia was slowly added to the sonicated mixture, and the mixture was sonicated for 15 min. The mixture was then placed in a reaction vessel and kept at 135℃ in a muffle furnace for 14 h. The resulting solution was then centrifuged (2500 rpm; time: 25 min) to obtain a precipitate, which was washed with an ethanol solution. The washed precipitate was then dried in a drying oven at 75℃ for 4 h to obtain a powder. Finally, the obtained powder was placed in a tube furnace and kept at 425℃ in an argon atmosphere for 2.5 h to obtain h-BN@TiO2.
[0062] Step 2: Mixing and drying powder
[0063] TiO2, h-BN@TiO2, and CuO were ball-milled at 200 r / min with a ball-to-material ratio of 4:1 for 60 min, followed by drying at 70℃ for 2 h. The mass percentages of the raw materials were: TiO2: 94 wt%, h-BN@TiO2: 5 wt%, and CuO: 1 wt%. The powder dimensions were: TiO2 ≤ 50 nm and CuO ≤ 50 nm.
[0064] Step 3, Spread powder
[0065] The dried powder mixture from step 2 is pressed onto the surface of the titanium alloy to obtain a pre-coating with a thickness of 1 mm.
[0066] Step 4: Perform laser cladding
[0067] The titanium alloy containing the pre-coated material from step 3 is obtained by single-pass laser cladding in air using a laser cladding device; the TC4 titanium alloy is cut using a wire cutting machine, and the size of the cut TC4 titanium alloy is 100mm×40mm×6mm.
[0068] The laser cladding equipment is a semiconductor fiber-coupled laser with a wavelength of 1080nm and a rectangular laser spot of 15mm×2mm. The laser process parameters are a laser cladding power of 1500W and a scanning speed of 1.5mm / s.
[0069] Compared to Example 1, the content of the h-BN@TiO2 cladding powder in Example 2 was increased to 5 wt%. The macroscopic morphology of the coating was smoother and free of cracks. Figure 1 (As can be seen). The microhardness change of the coating was tested using a microhardness tester, such as... Figure 2 As shown, the coating in Example 2 has a microhardness of up to 1500 HV. 0.2 According to XRD phase ( Figure 4 Analysis showed that, compared to Example 1, the coating contained additional BN, which was the undecomposed h-BN remaining in the cladding powder. This indicates that the TiO2 outer layer of the h-BN@TiO2 powder can protect h-BN during laser cladding, significantly reducing its decomposition. h-BN has a graphite-like layered structure, which can spread and form a lubricating film during friction, reducing the coefficient of friction.
[0070] Depend on Figure 5 It can be seen that, compared to the friction coefficient of 0.51 in the stable friction stage of Example 1, the friction coefficient of Example 2 is 0.39, a reduction of 23.5%. Figure 6 In Example 2, the wear amount was further reduced to 0.24 mg, a 93.1% reduction compared to the TC4 substrate wear amount (3.5 mg); and a 30% reduction compared to Example 1. The above data shows that during laser cladding, the core-shell coating structure reduced the decomposition of the self-lubricating phase h-BN. During the dry friction experiment, the hard phase and the self-lubricating phase worked synergistically to form a lubricating film on the titanium alloy substrate, reducing the friction coefficient, inhibiting the spalling of hard phase particles, and further improving the coating's wear resistance. Therefore, the wear resistance of Example 2 was further improved.
[0071] Example 3
[0072] The difference between this embodiment and Example 1 is that the mass percentage of each component in the raw materials is: TiO2: 96wt%, h-BN@TiO2: 3wt%, CuO: 1wt%.
[0073] Example 4
[0074] The difference between this embodiment and Example 1 is that the mass percentage of each component in the raw materials is: TiO2: 92wt%, h-BN@TiO2: 6wt%, CuO: 2wt%.
[0075] Comparative Example 1
[0076] The difference between this comparative example and Example 2 is that the raw material only contains TiO2 powder, without CuO and h-BN@TiO2. The resulting coating has a concave morphology, making it difficult to use in practice. CuO can lower the melting point of the cladding powder, allowing laser cladding to be performed at a lower laser power. In the cladding powder system without CuO, only a higher laser power can be used, which greatly increases the coating dilution rate, resulting in a concave coating morphology. Figure 1 It can be known that...
[0077] Comparative Example 2
[0078] The difference between this comparative example and the original example is that the raw materials are TiO2: 98wt% and CuO: 2wt%.
[0079] Compared to Example 1, when the CuO content was increased to 2 wt%, more obvious crack defects appeared after the coating was simply sanded with sandpaper, such as... Figure 1 As shown, CuO and titanium alloy substrates, as well as TiO2 powder, have significant differences in physical properties, and an increase in their content can easily lead to cracking defects in the coating.
[0080] Comparative Example 3
[0081] The difference between this comparative example and the original example is that the raw materials are: TiO2: 89wt%, h-BN@TiO2: 10wt%, and CuO: 1wt%.
[0082] Compared to Example 2, the cladding powder in Comparative Example 3 contains h-BN@TiO 2， When the content increased to 10 wt%, the macroscopic morphology of the coating was relatively smooth, but after simple polishing, a large number of crack defects appeared. Figure 1 As can be seen, the h-BN@TiO2 content is too high, resulting in significant differences in properties compared to the TC4 substrate and the generation of numerous porosity defects.
[0083] As can be seen from the above examples and comparative examples, laser cladding coatings with TiO2 as the main cladding powder exhibit excellent wear resistance on titanium alloy surfaces (microhardness can reach up to 1700 HV). 0.2 During laser cladding, h-BN@TiO2 can directly introduce oxygen from the air into the coating as a component (without needing inert gases like argon to isolate oxygen). h-BN@TiO2 significantly reduces the decomposition of h-BN during laser cladding, lowers the coating's friction coefficient, and improves wear resistance. CuO, on the other hand, reduces laser cladding power, preventing increased coating dilution and porosity / crack defects. However, h-BN@TiO2 and CuO have significantly different physical properties from other coating components and the titanium alloy matrix; therefore, their content cannot be too high (CuO below 2% wt, h-BN@TiO2 below 10% wt).
[0084] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent variations made to the content described in the claims of the present invention should be included within the scope of the claims of the present invention.
Claims
1. A method for preparing an oxygen-consuming laser-clad wear-resistant self-lubricating titanium alloy, characterized in that, The process involves mixing raw materials h-BN@TiO2, TiO2 and CuO to obtain a mixed powder, then spreading the mixed powder on the surface of a titanium alloy, and finally using a laser cladding device to laser clad the titanium alloy with the mixed powder in air. The mass percentages of each component in the raw material are as follows: TiO2: 92~98wt%, h-BN@TiO2: 1~6wt%, CuO: 1~2wt%.
2. The method for preparing oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy according to claim 1, characterized in that, The thickness of the mixed powder is 1~1.5mm.
3. The method for preparing oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy according to claim 2, characterized in that, The mass percentages of each component in the raw material are as follows: TiO2: 94 wt%, h-BN@TiO2: 5 wt%, CuO: 1 wt%.
4. The method for preparing oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy according to claim 1, characterized in that, The preparation method of h-BN@TiO2 includes adding h-BN with tetrabutyl titanate and polyvinylpyrrolidone to an ethanol solution for ultrasonic mixing, then adding ammonia to the ultrasonically treated mixture and carrying out a hydrothermal reaction, then centrifuging, washing and drying the resulting solution to obtain a powder, and finally placing the obtained powder in a tube furnace and keeping it at a constant temperature in an argon atmosphere to obtain h-BN@TiO2.
5. The method for preparing oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy according to claim 4, characterized in that, The raw materials for preparing h-BN@TiO2 have the following weight percentages: 80-83 wt% ethanol solution, 2-4 wt% h-BN, 4-6 wt% tetrabutyl titanate, 2-5 wt% polyvinylpyrrolidone, and 2-12 wt% ammonia.
6. The method for preparing oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy according to claim 1, characterized in that, The mixing process involves placing TiO2, h-BN@TiO2, and CuO in a ball mill and ball milling them at a speed of 200-250 r / min, a ball-to-material ratio of 4:1, a ball milling time of 30-60 min, and drying them at a temperature of 70℃ for 2-3 h.
7. The method for preparing oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy according to claim 1, characterized in that, The laser cladding equipment is a semiconductor fiber-coupled laser with a wavelength of 1080nm, a rectangular laser spot of 15mm×2mm, a laser cladding power of 1500~2000W, and a scanning speed of 1~2mm / s.
8. The method for preparing oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy according to claim 7, characterized in that, Includes the following steps: Step 1: Preparation of h-BN@TiO2 h-BN was added to an ethanol solution and ultrasonically mixed with tetrabutyl titanate and polyvinylpyrrolidone. Then, ammonia was added to the ultrasonically treated mixture and a hydrothermal reaction was carried out. The resulting solution was then centrifuged, washed, and dried to obtain a powder. Finally, the powder was placed in a tube furnace and kept at a temperature in an argon atmosphere to obtain h-BN@TiO2. Step 2: Mixing and drying powder TiO2, h-BN@TiO2 and CuO were placed in a ball mill and ball milled at a speed of 200 r / min, a ball-to-material ratio of 4:1 and a ball milling time of 60 min. Then, they were dried at a temperature of 70℃ for 2 h. Step 3, Spread powder The dried powder mixture from step 2 is pressed onto the surface of the titanium alloy to obtain a pre-coating with a thickness of 1 mm. Step 4: Perform laser cladding The titanium alloy containing the pre-coated layer in step 3 is obtained by performing a single-pass laser cladding in air using a laser cladding equipment. The laser cladding equipment is a semiconductor fiber-coupled laser with a wavelength of 1080nm and a rectangular laser spot of 15mm×2mm. The laser process parameters are a laser cladding power of 1500W and a scanning speed of 1.5mm / s.
9. The method for preparing oxygen-consuming laser cladding wear-resistant self-lubricating titanium alloy according to claim 8, characterized in that, The weight percentages of the raw materials used in step 1 to prepare h-BN@TiO2 are as follows: 80-83 wt% ethanol solution, 2-4 wt% h-BN, 4-6 wt% tetrabutyl titanate, 2-5 wt% polyvinylpyrrolidone, and 2-12 wt% ammonia. The mass percentages of each component in the raw materials in step 2 are: TiO2: 94 wt%, h-BN@TiO2: 5 wt%, CuO: 1 wt%.
10. A laser-clad wear-resistant self-lubricating titanium alloy, characterized in that, The wear-resistant self-lubricating titanium alloy is prepared by any of the laser cladding methods described in claims 1 to 9, wherein the microhardness of the titanium alloy is 1500-1700 HV. 0.2 .