Titanium alloy surface strengthened wear-resistant layer and preparation method thereof

Abstract

The application relates to a titanium alloy surface reinforced wear-resistant layer and a preparation method thereof, and belongs to the technical field of wear-resistant coatings. The preparation method comprises the following steps: S1, preparing rare earth zirconate slurry and zirconium oxide slurry; S2, coating the zirconium oxide slurry, the rare earth zirconate slurry and the zirconium oxide slurry on the titanium alloy surface in sequence and drying, so as to form a bottom layer of zirconium oxide, a rare earth zirconate layer and a top layer of zirconium oxide on the titanium alloy surface; and S3, using laser scanning to coat the dried titanium alloy surface, so that the bottom layer of zirconium oxide, the rare earth zirconate layer and the top layer of zirconium oxide are fused on the titanium alloy surface, and a metal-based wear-resistant layer with dispersed distribution of rare earth zirconate spherical particles is formed. The application prepares the wear-resistant layer on the titanium alloy surface through laser cladding, and the wear-resistant layer and the titanium alloy do not have the problem of poor interfacial bonding force, and the spherical strengthening phase makes the wear-resistant layer have wear resistance and sufficient toughness.

Description

Technical Field

[0001] This invention relates to the field of wear-resistant coating technology, and in particular to a wear-resistant layer for strengthening the surface of titanium alloys and its preparation method. Background Technology

[0002] Titanium metal and its alloys possess relatively low density, high specific strength, and excellent corrosion resistance, making them widely used in many industrial fields such as aviation, aerospace, and marine. However, a major performance defect of titanium alloys is their insufficient surface wear resistance. In actual working conditions, they are prone to fretting wear and abrasive wear, which not only cause mechanical damage to the titanium alloy surface but also destroy the protective passivation film, leading to an accelerated corrosion rate.

[0003] Applying wear-resistant coatings to titanium alloy surfaces using various methods, such as spraying, laser cladding, and electroplating, is an effective way to improve the friction performance of titanium alloys. Currently, most wear-resistant coatings used are hard ceramic layers, which have high hardness and good wear resistance, but also high brittleness, making them prone to cracking and peeling. Metal-ceramic composite coatings can balance wear resistance and toughness, and are generally prepared using composite electrodeposition methods. However, titanium alloys are difficult to electroplate, and the interfacial bonding between the coating and the substrate prepared by composite electrodeposition processes is difficult to guarantee. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a wear-resistant layer for strengthening the surface of titanium alloy and its preparation method, so as to solve the problems of high brittleness of existing hard ceramic layers and poor interfacial bonding between high-toughness metal-ceramic composite coatings prepared by electrodeposition and titanium alloys.

[0005] On one hand, embodiments of the present invention provide a method for preparing a wear-resistant and reinforced layer on a titanium alloy surface, comprising:

[0006] Step S1: Prepare rare earth zirconate slurry and zirconium oxide slurry;

[0007] Step S2: Zirconia slurry, rare earth zirconate slurry and zirconia slurry are sequentially coated on the surface of the titanium alloy and dried to form a bottom layer of zirconia, a rare earth zirconate layer and a top layer of zirconia on the surface of the titanium alloy.

[0008] Step S3: Use laser scanning to coat the dried titanium alloy surface so that the bottom zirconium oxide layer, rare earth zirconate layer and top zirconium oxide layer are clad on the titanium alloy surface to form a metal-based wear-resistant layer with spherical rare earth zirconate particles dispersedly distributed.

[0009] Further, in step S2, the coating amount of rare earth zirconate is controlled to be 0.2 g / cm³. 2 ~0.3g / cm 2 .

[0010] Furthermore, in step S2, the amount of the underlying zirconium oxide coating is controlled to be 1 / 2 of the amount of rare earth zirconate coating.

[0011] Furthermore, in step S3, when using laser scanning to coat the dried titanium alloy surface, the laser power is controlled at 600W to 800W, and the laser scanning rate is controlled at 1800mm / min to 2000mm / min.

[0012] Furthermore, in step S2, the coating amount of the top-layer zirconium oxide is controlled to be 0.1 g / cm³. 2 ~0.2g / cm 2 .

[0013] Further, in step S1, rare earth zirconate powder is uniformly mixed with solvent to prepare rare earth zirconate slurry; zirconium oxide powder is uniformly mixed with solvent to prepare zirconium oxide slurry.

[0014] Furthermore, the particle size of the rare earth zirconate powder is controlled within 5–10 μm.

[0015] Furthermore, the particle size of the zirconium oxide powder is controlled within the range of 30–50 μm.

[0016] Furthermore, in step S3, the laser is controlled to scan along a serpentine reciprocating scanning path, and the overlap between adjacent scans is 40% to 60%.

[0017] On the other hand, embodiments of the present invention provide a reinforced wear-resistant layer on the surface of a titanium alloy, which is formed by laser cladding using the method described in the above embodiments. The reinforced wear-resistant layer includes: a metal substrate clad on the surface of the titanium alloy and spherical rare earth zirconate particles dispersed in the substrate.

[0018] Compared with the prior art, the present invention can achieve at least the following beneficial effects:

[0019] 1. This invention prepares a wear-resistant layer on the surface of a titanium alloy by laser cladding. The wear-resistant layer and the titanium alloy are completely fused together by metallurgical bonding, and there is no problem of poor interfacial bonding. Furthermore, the metal-based wear-resistant layer reinforced by spherical rare earth zirconate ceramic particles has both the wear resistance of ceramics and the high toughness of metals, thus ensuring the interfacial bonding and wear resistance of the wear-resistant layer while also providing sufficient toughness.

[0020] 2. This invention involves sequentially coating the surface of a titanium alloy with three layers of slurry: a bottom layer of zirconium oxide, a rare earth zirconate, and a top layer of zirconium oxide. During the laser cladding process, the bottom and top layers of zirconium oxide replenish zirconium elements to compensate for the severe burn-off of zirconium elements by rare earth zirconate during laser cladding. The top layer of zirconium oxide protects the zirconium elements in the lower layers, reducing the loss of zirconium elements in the lower layers and ensuring that the final cladding layer is formed with rare earth zirconate rather than rare earth oxide.

[0021] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the details specifically pointed out in the description and drawings. Attached Figure Description

[0022] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0023] Figure 1 This is a microstructure diagram of the cross-section of the wear-resistant layer on the titanium alloy surface in Embodiment 1 of the present invention.

[0024] Figure 2 This is a microstructure diagram of the cross-section of the wear-resistant layer on the surface of the titanium alloy in Comparative Example 1 of the present invention. Detailed Implementation

[0025] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0026] Embodiments of the present invention provide a method for preparing a wear-resistant reinforced layer on the surface of a titanium alloy, comprising:

[0027] Step S1: Prepare rare earth zirconate slurry and zirconium oxide slurry;

[0028] Step S2: Zirconia slurry, rare earth zirconate slurry and zirconia slurry are sequentially coated on the surface of the titanium alloy and dried to form a bottom layer of zirconia, a rare earth zirconate layer and a top layer of zirconia on the surface of the titanium alloy.

[0029] Step S3: Use laser scanning to coat the dried titanium alloy surface so that the bottom zirconium oxide layer, rare earth zirconate layer and top zirconium oxide layer are fused onto the titanium alloy surface to form a rare earth zirconate dispersed metal-based wear-resistant layer.

[0030] This invention prepares a reinforced wear-resistant layer on the surface of titanium alloys via laser cladding. The laser-clad metal-based wear-resistant layer and the titanium alloy are completely fused together in a metallurgical bond, eliminating the problem of poor interfacial adhesion. Furthermore, the wear-resistant layer prepared by laser cladding incorporates spherical rare-earth zirconate ceramic particles, giving the wear-resistant layer both the wear resistance of ceramics and the high toughness of metals. Therefore, the method of this invention for preparing a wear-resistant layer on the surface of titanium alloys ensures both interfacial adhesion and wear resistance while providing sufficient toughness.

[0031] The chemical formula of rare earth zirconates is RE₂Zr₂O₇, where RE represents any one or at least two rare earth elements, such as lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium, and yttrium. Examples include La₂Zr₂O₇, Ce₂Zr₂O₇, Sm₂Zr₂O₇, Lu₂Zr₂O₇, and (Y₂Zr₂O₇). 0.5 La 0.5 )2Zr2O7、(Y 0.3 La 0.3 Nd 0.2 Sm 0.2 )2Zr2O7, etc.

[0032] Because zirconium is easily lost in the form of zirconium vapor during laser cladding, resulting in severe burn-off, this invention addresses this issue by setting a top layer of zirconium oxide and a bottom layer of zirconium oxide above and below the rare earth zirconate layer, respectively. The zirconium oxide is used to supplement the zirconium element, which can compensate for the severe burn-off of zirconium in the rare earth zirconate during laser cladding. At the same time, the top layer of zirconium oxide protects the zirconium element in the lower layer, reducing the loss of the lower layer of zirconium element and ensuring that the final cladding layer is formed as a rare earth zirconate rather than a rare earth oxide.

[0033] In some embodiments, in step S1, rare earth zirconate powder is uniformly mixed with a solvent to prepare a rare earth zirconate slurry; and zirconia powder is uniformly mixed with a solvent to prepare a zirconia slurry.

[0034] In some embodiments, the solvent used may be acetone. The mass ratio of rare earth zirconate powder to acetone can be controlled within the range of 1:1 to 1.5:1, and the mass ratio of zirconium oxide powder to acetone can also be controlled within the range of 1:1 to 1.5:1.

[0035] In some embodiments, in step S1, the particle size of the rare earth zirconate powder is controlled to be 5-10 μm. If the particle size of the rare earth zirconate powder is too small, the specific surface area of ​​the powder will be too high, which will aggravate the burn-off of zirconium elements during the cladding process; if the particle size of the rare earth zirconate powder is too large, it will cause the surface to be too rough after cladding.

[0036] In some embodiments, the particle size of the zirconia powder used in step S1 is controlled to be 30–50 μm. Using a relatively large particle size of the zirconia powder is to make the top zirconia coating layer more dense, thereby strengthening the protection of the underlying zirconium element and reducing the burn-off of the underlying zirconium element.

[0037] In some embodiments, the coating amount of rare earth zirconate can be controlled to be 0.2 g / cm³ in step S2. 2 ~0.3g / cm 2 For example, 0.2 g / cm 2 0.21g / cm 2 0.22g / cm 2 0.23g / cm 2 0.24g / cm 2 0.25g / cm 2 0.26g / cm 2 0.27g / cm 2 0.28g / cm 2 0.29g / cm 2 0.3g / cm 2 This invention enhances the wear resistance of the wear-resistant layer by controlling the amount of rare earth zirconate coating, ensuring that the formed wear-resistant layer contains dispersed rare earth zirconate particles. This avoids excessive or insufficient rare earth zirconate coating, which would lead to a decrease in wear resistance.

[0038] In some embodiments, in step S2, the coating amount of the underlying zirconium oxide can be determined based on the coating amount of rare earth zirconate. Specifically, the coating amount of the underlying zirconium oxide can be controlled to be 1 / 2 of the coating amount of rare earth zirconate. During the laser cladding process, both the underlying zirconium oxide and rare earth zirconate layers will be largely melted into the titanium alloy substrate to form a titanium-zirconium metal-based cladding layer, while some rare earth zirconate particles are dispersed in the metal-based cladding layer.

[0039] The relative content between the bottom zirconium oxide layer and the rare earth zirconate layer affects the composition and structure of the cladding layer. If the bottom zirconium oxide coating is too low, the zirconium element loss in the rare earth zirconate cannot be fully replenished during the laser cladding process, which may result in a large amount of rare earth oxides rather than complete rare earth zirconate in the wear-resistant layer. If the bottom zirconium oxide coating is too high, it may result in a large amount of zirconium oxide rather than complete rare earth zirconate in the wear-resistant layer, thereby affecting the wear resistance of the wear-resistant layer.

[0040] In step S2, after each layer of slurry is applied, it should be allowed to air dry naturally for a period of time, such as 5 to 8 minutes, to ensure that a three-layer coating of top and bottom zirconium oxide, rare earth zirconate layer and top zirconium oxide is finally formed.

[0041] In some embodiments, in step S3, when using a laser to scan and coat the dried titanium alloy surface, the laser power is controlled at 600–800 W, for example, 600 W, 650 W, 700 W, 750 W, or 800 W; and the laser scanning rate is controlled at 1800–2000 mm / min, for example, 1800 mm / min, 1850 mm / min, 1900 mm / min, 1950 mm / min, or 2000 mm / min. During laser cladding, the laser power and scanning rate determine the amount of heat input. If the laser power is too high or the scanning rate is too low, the heat input will be too high, resulting in excessive mixing between the coating layer and the titanium alloy, and excessive melting depth of the titanium alloy. This leads to a low content of rare earth zirconate particles in the wear-resistant layer, failing to achieve an effective strengthening effect. Conversely, if the heat input is too low, the coating layer cannot fuse with the titanium alloy, and a wear-resistant layer with a uniform microstructure cannot be formed.

[0042] In some embodiments, the coating amount of the top-layer zirconium oxide can be controlled to be 0.1 g / cm³ in step S2. 2 ~0.2g / cm 2 For example, 0.1 g / cm³ 2 0.11 g / cm 2 0.12g / cm 2 0.13g / cm 2 0.14 g / cm 2 0.15g / cm 2 0.16 g / cm 2 0.17g / cm 2 0.18g / cm 2 0.19g / cm 2 0.2g / cm 2 If the coating amount is too large, zirconium oxide residue will remain on the surface of the cladding layer; if the coating amount is too small, it will not provide adequate protection for the underlying layer, resulting in a significant amount of zirconium being burned off under laser irradiation. This invention, by controlling the coating amount of zirconium oxide on the top layer, can ensure good protection for the underlying layer while avoiding zirconium oxide residue in the formed wear-resistant layer.

[0043] It should be noted that the main function of the top-layer zirconia is to minimize the loss of zirconium elements in the two layers below it; therefore, its coating amount is unrelated to the coating amounts of the two layers below it. This invention controls the coating amount of the top-layer zirconia primarily to ensure that there is no significant residue during laser cladding, while also protecting the zirconium elements in the lower layers from severe burn-off.

[0044] Therefore, the coating amount of the top zirconia layer is mainly related to the heat input of the laser used; that is, the specific coating amount of the top zirconia layer can be determined according to the laser power and scanning rate. When the laser power is low or the scanning rate is high, a smaller coating amount of top zirconia should be used; when the laser power is high or the scanning rate is low, a larger coating amount of top zirconia should be used. When the laser power required in the laser cladding process is 600–800W and the laser scanning rate is 1800–2000 mm / min, the coating amount of the top zirconia layer can be controlled to be 0.1 g / cm³. 2 ~0.2g / cm 2 .

[0045] In some embodiments, during the laser cladding process in step S3, a serpentine reciprocating scanning path is used to control the laser scanning, and the overlap between adjacent passes is 40% to 60%, preferably 50%.

[0046] In some embodiments, after step S3 is completed, the method further includes cleaning the residual powder on the titanium alloy surface to remove impurities and contaminants generated during the laser cladding process, thereby ensuring the quality and performance of the wear-resistant layer.

[0047] Embodiments of the present invention also provide a reinforced wear-resistant layer for a titanium alloy surface. The reinforced wear-resistant layer comprises: a metal substrate clad onto the titanium alloy surface and spherical rare-earth zirconate particles dispersed within the substrate. The wear-resistant layer can be formed by laser cladding using the method described in the above embodiments.

[0048] The wear-resistant layer of this invention is a metal matrix reinforced with spherical rare earth zirconate particles. Compared with hard ceramics, the wear-resistant layer with metal as the matrix has higher toughness. A large number of spherical rare earth zirconate particles are dispersed in the metal matrix, which can enhance the wear resistance of the metal matrix, so that the wear-resistant layer of this invention has both high toughness and wear resistance.

[0049] The following examples further illustrate the titanium alloy surface strengthening and wear-resistant layer of the present invention and its preparation method.

[0050] Example 1

[0051] The method for preparing the wear-resistant and reinforced titanium alloy surface layer in this embodiment includes the following steps.

[0052] (1) Cut a Ti60 titanium alloy plate with a size of 30mm×30mm×3mm, and clean and degrease the surface.

[0053] (2) Prepare lanthanum zirconate and zirconium oxide pastes respectively according to the mass ratio of acetone to powder of 1:1. The average particle size of the selected lanthanum zirconate is 5 μm and the average particle size of zirconium oxide is 30 μm.

[0054] (3) Coating the surface of Ti60 plates with 0.1 g / cm³ of coating material sequentially. 2 The bottom zirconium oxide layer, 0.2 g / cm 2 Lanthanum zirconate layer and 0.1 g / cm 2 The top layer is a zirconium oxide layer. Specifically, 0.9g of zirconium oxide is coated on one side and allowed to air dry for 8 minutes; then 1.8g of lanthanum zirconate is coated and allowed to air dry for 8 minutes; finally, 0.9g of zirconium oxide is coated and allowed to air dry for another 8 minutes.

[0055] (4) Set the laser power to 600W, the scanning rate to 2000mm / min, the scanning path to be a serpentine motion along the edge of the Ti60 titanium alloy plate, the overlap of adjacent passes to 50%, and perform one laser cladding.

[0056] (5) Clean the surface of residual powder.

[0057] The microstructure of the final wear-resistant layer cross-section was observed, such as... Figure 1 As shown, the wear-resistant layer (i.e., the cladding layer) is approximately 510 μm deep, containing a large number of fine spherical particles. EDS analysis revealed that the dispersed spherical particles in the wear-resistant layer consist of 70.5 at.% O, 14.8 at.% Zr, 12.6 at.% La, and 2.1 at.% Ti, indicating that the spherical particles are primarily composed of lanthanum zirconate.

[0058] Wear resistance tests were conducted on the titanium alloy sheet with the wear-resistant layer described above. Under the conditions of 10N pressure and 10min reciprocating friction test, the wear amount of the sample in this embodiment was approximately 9.8mg.

[0059] Example 2

[0060] The method for preparing the wear-resistant and reinforced titanium alloy surface layer in this embodiment includes the following steps.

[0061] (1) Cut a Ti60 titanium alloy plate with a size of 30mm×30mm×3mm, and clean and degrease the surface.

[0062] (2) Prepare yttrium zirconate and zirconium oxide pastes respectively according to the mass ratio of acetone to powder of 1:1.5. The average particle size of the selected yttrium zirconate is 8 μm and the average particle size of zirconium oxide is 50 μm.

[0063] (3) Coating the surface of Ti60 plates with 0.1 g / cm³ of coating material sequentially. 2 The bottom zirconium oxide layer, 0.2 g / cm 2 The yttrium zirconate layer and 0.1 g / cm 2The top layer of zirconia. That is, 0.9g of zirconia is coated on one side of the Ti60 plate and allowed to air dry for 5 minutes; then 1.8g of yttrium zirconate is coated and allowed to air dry for 5 minutes; finally, 0.9g of zirconia is coated and allowed to air dry for another 5 minutes.

[0064] (4) Set the laser power to 800W, the scanning rate to 1800mm / min, the scanning path to be a serpentine motion along the edge of the Ti60 titanium alloy plate, the overlap of adjacent passes to 50%, and perform one laser cladding.

[0065] (5) Clean the surface of residual powder.

[0066] Wear resistance tests were conducted on the titanium alloy sheet with the wear-resistant layer described above. Under the conditions of 10N pressure and 10min reciprocating friction test, the wear amount of the sample in this embodiment was approximately 11.7mg.

[0067] Example 3

[0068] The method for preparing the wear-resistant and reinforced titanium alloy surface layer in this embodiment includes the following steps.

[0069] (1) Cut a Ti60 titanium alloy plate with a size of 30mm×30mm×3mm, and clean and degrease the surface.

[0070] (2) Prepare samarium zirconate and zirconium oxide pastes respectively according to the mass ratio of acetone to powder of 1:1.2. The average particle size of lanthanum zirconate and zirconium oxide is 10 μm and 40 μm respectively.

[0071] (3) Coating the surface of Ti60 plates with 0.1 g / cm³ of coating material sequentially. 2 The bottom zirconium oxide layer, 0.2 g / cm 2 The samarium zirconate layer and 0.1 g / cm 2 The top layer of zirconium oxide. That is, 0.9g of zirconium oxide is coated on one side and allowed to air dry for 7 minutes; then 1.8g of samarium zirconate is coated and allowed to air dry for 7 minutes; finally, 0.9g of zirconium oxide is coated and allowed to air dry for another 7 minutes.

[0072] (4) Set the laser power to 700W, the scanning rate to 1900mm / min, the scanning path to be a serpentine motion along the edge of the Ti60 titanium alloy plate, the overlap of adjacent passes to 50%, and perform one laser cladding.

[0073] (5) Clean the surface of residual powder.

[0074] Wear resistance tests were conducted on the titanium alloy sheet with the wear-resistant layer described above. Under the conditions of 10N pressure and 10min reciprocating friction test, the wear amount of the sample in this embodiment was approximately 10.5mg.

[0075] Example 4

[0076] The difference between this embodiment and Embodiment 1 is that in this embodiment, the rare earth zirconate coating on the titanium alloy plate surface uses a combination of two rare earth elements. Specifically, the rare earth zirconate is replaced with (Y 0.5 La 0.5 )2Zr2O7, and the other conditions are the same as in Example 1.

[0077] Under the conditions of 10N pressure and 10min reciprocating friction test, the wear amount of the sample in this embodiment is about 9.1mg.

[0078] Example 5

[0079] To investigate the effect of different coating amounts on wear resistance, nine identical Ti60 titanium alloy plates with dimensions of 30mm×30mm×3mm were prepared and designated as samples 1 to 9. Zirconia slurry, lanthanum zirconate slurry, and zirconium oxide slurry were coated sequentially on the surface of each sample. The coating amount of each slurry is shown in Table 1.

[0080] The remaining conditions are the same as in Example 1, and will not be repeated here.

[0081] Wear resistance tests were conducted on each sample. Under the conditions of 10N pressure and 10min reciprocating friction test, the wear amount of each sample is shown in Table 1.

[0082] Table 1. Coating amount of different coating layers and corresponding wear resistance performance of the wear-resistant layer.

[0083]

[0084] According to the wear resistance test results of samples 1-5 in Table 1, when the coating amount of lanthanum zirconate and the coating amount of the underlying zirconium oxide are within a suitable range, the wear amount of the sample is low, below 13.6 mg, and the wear resistance is significantly improved. However, when the coating amount of lanthanum zirconate is too small or too large, as shown in samples 1 and 5, the wear amount of the sample increases significantly, indicating that its wear resistance deteriorates.

[0085] Based on the abrasion resistance test results of samples 2, 6-9 in Table 1, it can be seen that when the coating amount of the top layer of zirconium oxide is within a suitable range (0.1-0.2 g / cm³), the abrasion resistance is significantly improved. 2 When the amount of zirconia coating on the top layer is too small or too large (see samples 6 and 9), the wear amount of the samples increases significantly, indicating that their wear resistance deteriorates.

[0086] Comparative Example 1

[0087] The difference between this comparative example and Example 1 is that this comparative example only coats the surface of the titanium alloy sheet with a layer of 0.2 g / cm³.2 Lanthanum zirconate, i.e., 1.8g of lanthanum zirconate coated on one side and air-dried for 8 minutes.

[0088] The microstructure of the formed wear-resistant layer cross-section was observed, such as... Figure 2 As shown, the depth of the wear-resistant layer (i.e., the cladding layer) is approximately 680 μm. Compared to Example 1, the titanium alloy sheet in this comparative example experienced a greater degree of thermal impact and melting; it also contained a large number of fine spherical particles. However, EDS analysis revealed that the spherical particles dispersed in the wear-resistant layer consisted of 66.3 at.% O, 1.8 at.% Zr, 30.2 at.% La, and 1.7 at.% Ti, indicating that the spherical particles were mainly composed of lanthanum oxide. This suggests that without the zirconium oxide coating, the zirconium element in the lanthanum zirconate layer underwent severe burn-off.

[0089] Wear resistance tests were conducted on the titanium alloy plates with wear-resistant layers described above. Under the conditions of 10N pressure and 10min reciprocating friction test, the wear amount of the sample in this comparative example was approximately 15.5mg.

[0090] As can be seen from the comparison between Example 1 and this comparative example, by setting a top layer of zirconium oxide and a bottom layer of zirconium oxide above and below the rare earth lanthanum zirconate respectively, the burn-off of zirconium elements during laser cladding can be compensated, ensuring that rare earth zirconate particles are formed in the wear-resistant layer instead of rare earth oxides, thus significantly improving the wear resistance of the wear-resistant layer.

[0091] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a wear-resistant and reinforced surface layer on a titanium alloy, characterized in that, include: Step S1: Prepare rare earth zirconate slurry and zirconium oxide slurry; Step S2: The zirconium oxide slurry, the rare earth zirconate slurry, and the zirconium oxide slurry are sequentially coated on the surface of the titanium alloy and dried to form a bottom zirconium oxide layer, a rare earth zirconate layer, and a top zirconium oxide layer on the surface of the titanium alloy. Step S3: Use laser scanning to coat the dried titanium alloy surface so that the bottom zirconium oxide layer, rare earth zirconate layer and top zirconium oxide layer are fused onto the titanium alloy surface to form a metal-based wear-resistant layer with spherical rare earth zirconate particles dispersedly. In step S2, the coating amount of the rare earth zirconate is controlled to be 0.2 g / cm³. 2 ~0.3g / cm 2 The coating amount of the bottom zirconium oxide is controlled to be 1 / 2 of the coating amount of the rare earth zirconate, and the coating amount of the top zirconium oxide is controlled to be 0.1 g / cm³. 2 ~0.2 g / cm 2 ; In step S3, the laser power is controlled at 600~800W and the laser scanning rate is controlled at 1800~2000mm / min.

2. The preparation method according to claim 1, characterized in that, In step S2, the coating amount of the rare earth zirconate is controlled to be 0.22 g / cm³. 2 ~0.28 g / cm 2 .

3. The preparation method according to claim 1, characterized in that, In step S3, when using laser scanning to coat the dried titanium alloy surface, the laser power is controlled at 650~750W and the laser scanning rate is controlled at 1850~1950mm / min.

4. The preparation method according to claim 3, characterized in that, In step S2, the coating amount of the top-layer zirconium oxide is controlled to be 0.13 g / cm³. 2 ~0.18 g / cm 2 .

5. The preparation method according to any one of claims 1-4, characterized in that, In step S1, rare earth zirconate powder is uniformly mixed with a solvent to prepare the rare earth zirconate slurry; zirconium oxide powder is uniformly mixed with a solvent to prepare the zirconium oxide slurry.

6. The preparation method according to claim 5, characterized in that, The particle size of the rare earth zirconate powder is controlled at 5~10μm.

7. The preparation method according to claim 5, characterized in that, The particle size of the zirconium oxide powder is controlled at 30~50μm.

8. The preparation method according to claim 1, characterized in that, In step S3, the laser is controlled to scan along a serpentine reciprocating scanning path, and the overlap between adjacent scans is 40% to 60%.

9. A reinforced wear-resistant layer on the surface of a titanium alloy, characterized in that, The reinforced wear-resistant layer is formed by laser cladding according to any one of claims 1-8, wherein the layer comprises: a metal substrate clad on the surface of the titanium alloy and spherical rare earth zirconate particles dispersed in the substrate.

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