A method for preparing a diamond mechanically coated titanium powder composite coating

Abstract

This invention discloses a method for preparing a diamond mechanically coated titanium powder composite coating. This method solves the current problems of feed powder preparation for titanium-based composite coatings and the uneven distribution of hard phase diamond in the composite feed powder. It also provides a method for designing the diamond-titanium mixing ratio and preparing the mixed powder, as well as a method for preparing the diamond mechanically coated titanium powder composite coating. By controlling the mass ratio of the mixed powder, diamond is uniformly coated on the titanium powder and deposited as a dense coating, resulting in a coating with better hardness and excellent corrosion resistance.

Description

Technical Field

[0001] This invention belongs to the field of cold spray composite coating technology, specifically relating to a method for preparing a diamond mechanically coated titanium powder composite coating. Background Technology

[0002] Titanium, due to its excellent mechanical properties and corrosion resistance, has been widely used in aerospace, power, chemical, and marine environments in recent years. Its lightweight nature makes it suitable for lightweight components. However, in marine environments, prolonged exposure to corrosion can lead to galvanic corrosion due to potential differences, and seawater erosion further damages the material, causing it to lose its properties. Currently, the main method for protecting the material surface is to prepare coatings to protect the substrate and improve its usability. These methods include plasma spraying, supersonic spraying, cold spraying, and laser surface treatment. Cold spraying, as an emerging spraying method, utilizes powder with a temperature below its melting point, resulting in relatively low heat transfer upon impact with the substrate. The spraying gases are primarily nitrogen and helium to minimize contact with air, significantly reducing the harmful effects of powder oxidation and phase transitions.

[0003] Cold spraying is a fully solid-state method where the sprayed particles do not melt during the spraying process. Only when the particle velocity exceeds the critical velocity does adiabatic shear instability occur under extreme strain, causing the particles to collide with the matrix and undergo plastic deformation, forming a good mechanical and metallurgical bond. Generally, easily deformable particles are easier to deposit, but as particle hardness increases, the degree of deformation decreases, hindering deposition. However, the presence of hard particles in the coating can increase the coating hardness. Currently, there are few successful cases of preparing diamond-titanium composite feedstock powders. At present, successful diamond composite powders are mainly obtained by pre-coating diamond with chemical vapor deposition (CVD) or electroplating (application publication numbers CN114875260A, CN113441680, CN108505022A, CN109023250A), coating the diamond surface with metallic materials, but this method has significant drawbacks. For example, the diamond cannot be uniformly coated onto the surface of the metal material during the preparation process, and the coating success rate is low. In addition, the preparation process consumes energy and chemicals, causing environmental pollution and making it impossible to produce on a large scale in industry.

[0004] Currently, the main approach to cold spray deposition of hard phases in coatings is to modify spraying parameters, such as the carrier gas preheating powder initial temperature, spraying carrier gas pressure, and spraying gas. Patent publication number CN101285187B describes a high-energy ball milling method for preparing metal-based composite powders, successfully depositing hard particles in the coating using argon and helium spraying gases. Using argon and helium allows for greater powder velocity during preheating and spraying, achieving a mechanical bond between the hard and metallic phases to improve coating density. However, this patent's method and preparation time are cumbersome, time-consuming, and costly, and it does not improve the spraying effect from the material itself. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a method for preparing a diamond mechanically coated titanium powder composite coating. This method solves the problems of uneven preparation of feed powder for titanium-based composite coatings and the uneven distribution of hard phase diamond in the composite feed powder. It also provides a method for designing the mixing ratio of diamond and titanium, preparing the mixed powder, and a method for preparing a diamond mechanically coated titanium powder composite coating. By controlling the mass ratio of the mixed powder, diamond is uniformly coated on the titanium powder and deposited as a dense coating, resulting in a coating with better wear resistance, higher hardness, and good corrosion resistance (3.5 wt.% NaCl). This invention is a method that improves the uniform composite of diamond and spherical titanium powder, enhances the bonding force between the composite powders, improves the performance of the prepared composite coating, and is simple, easy to operate, easy to process, and suitable for industrial production.

[0006] This invention is achieved through the following technical solution:

[0007] A method for preparing a diamond mechanically coated titanium powder composite coating includes the following steps:

[0008] Step 1, powder premixing: titanium powder and diamond powder are mixed to obtain a first mixture, and the first mixture is mechanically stirred for 0.1 to 1 hour to obtain a stirred first mixture;

[0009] Stearic acid granules are added to the first mixture after stirring, and mechanical stirring is continued for 0.1 to 1 hour to obtain a premixed powder.

[0010] In the first mixture, the mass ratio of titanium powder to diamond powder is 100:(1-20);

[0011] The mass ratio of the added stearic acid particles to the first mixture after stirring is (1-10):100;

[0012] Step 2, ball milling: The premixed powder is ball milled using a low-energy planetary ball mill with a ball-to-material ratio of 3 to 10:1, a rotation speed of 100 to 400 rpm / min, and a milling time of 1 to 6 hours. The ball-milled powder is then sieved and used as a raw material for cold spraying titanium-based composite powder.

[0013] Step 3, cold spraying: cold spraying is performed using the titanium-based composite powder cold spraying material. The spraying temperature is 700℃~900℃, the spraying pressure is 3~5MPa, and the powder feeding gas and main spraying gas are high-purity nitrogen to ensure that the deposition efficiency is greater than 40%, thereby obtaining the diamond mechanically coated titanium powder composite coating.

[0014] In the above technical solution, the particle size of the titanium powder is 5-30 μm, and the particle size of the diamond powder is 0.1-5 μm.

[0015] In the above technical solution, the titanium powder is spherical or near-spherical; the diamond powder is irregular in shape.

[0016] In the above technical solution, the ball milling process is an intermittent ball milling process, with each run lasting 0.1 to 0.5 hours and an interval of 0.1 to 0.3 hours.

[0017] In the above technical solution, the nitrogen volume content of the high-purity nitrogen gas is above 99.99%.

[0018] In the above technical solution, the particle size of the titanium-based composite powder cold spraying raw material is 5-30 μm.

[0019] In the above technical solution, the cold spraying process uses titanium metal as the substrate, preferably titanium alloy metal plate TC4.

[0020] In the above technical solution, the hardness of the diamond mechanically coated titanium powder composite coating is 180-210 MPa.

[0021] The advantages and beneficial effects of this invention are as follows:

[0022] This invention is scientifically and rationally designed. By controlling the mass ratio of titanium powder to diamond powder in the composite powder, diamond is uniformly coated on the surface of spherical titanium powder. The powder preparation method is simple, and the coating deposition efficiency is high. The reason why the final diamond mechanically coated titanium powder composite coating has a good effect is that the diamond is uniformly coated on the titanium powder. During the spraying process, the composite powder (diamond-coated titanium) titanium spheres carry the diamond and are deposited on the substrate. The titanium-to-titanium junction is diamond. During the cold spraying process, the diamond itself is a hard phase and is not easily deformed. Therefore, during the deposition process, the diamond can be embedded between two titanium spheres, allowing the two different particles to bond better.

[0023] The titanium-based composite powder cold spraying raw material prepared by this invention can achieve excellent uniform coating of diamond powder on the exterior of titanium sphere powder using a simple method. The desired coating effect can only be achieved by using the two powders in this invention with specified particle size and mass ratio. If the diamond particle size is too small, it will cause agglomeration and be difficult to coat; if the diamond is too large, it cannot be coated at all. In the prior art, the diamond used is also relatively small. If the amount is too small, coating can be achieved, but not uniformly. If the amount of diamond is too large, the coating will be less wear-resistant. If the titanium powder size is too large, the diamond can only coat locally; if it is too small, the diamond cannot be coated at all, and the particles are too small to be easily sprayed.

[0024] Regarding existing techniques (Heer, F, C, et al. Synthesis of nanodiamond-reinforced aluminum metal matrix composites using cold-spray deposition[J]. Carbon: An International Journal Sponsored by the American Carbon Society, 2015.), the method used in this article is as follows: ND-Al powder is produced using a SPEX 8000m high-energy ball mill, employing a 65ml hardened steel cylinder and 5mm hardened steel grinding balls. The grinding jar is sealed in a glove box filled with Ar to remove oxygen and moisture before grinding. In all experiments, 3.0wt% stearic acid is added to the powder mixture as a process control agent (PCA) to prevent agglomeration. The ND content in the Al matrix is ​​set to 10wt%. The grinding conditions are a ball-to-powder mass ratio of 10:1, with grinding times of 0.5 and 3 h, respectively. After grinding, the powder is annealed in argon at 420℃ for 24 h. In this article, it is shown that as the ball milling time increases, the effect of cold deposition decreases due to the breakage and deformation of Al particles (the deposition effect is better when the cold spray powder is spherical). Furthermore, a diamond-to-graphite transformation occurs after spraying, as indicated by the Raman spectroscopy results. Additionally, the fact that the particle size increases several times after ball milling, as observed in the composite particles, suggests that nanodiamonds aggregate on the surface.

[0025] The technical solution in this application does not involve excessive gas protection conditions for powder processing, nor does it involve the addition of organic matter or an annealing process to remove organic matter. Finally, no phase structure transformation occurs in the material before and after spraying; no graphite phase appears, and no new phases emerge.

[0026] Other existing technologies, such as CVD technology, which deposits metal onto diamond, cannot guarantee the titanium content and introduces new metals into the coating, making the preparation process difficult and unable to guarantee the reproducibility.

[0027] In summary, this application utilizes mechanical ball milling to control material composition and the ball milling process, enabling diamond to coat titanium powder. The process is simple and allows for large-scale production of composite powders. Furthermore, the coating deposition efficiency is high, and the final coating exhibits significantly improved wear resistance and corrosion resistance. The microhardness of the resulting composite coating is 20% higher than that of the pure titanium coating, and its corrosion resistance is significantly enhanced. Attached Figure Description

[0028] Figure 1 These are scanning electron microscope (SEM) images of the morphology of the titanium-based composite powder cold spraying raw material prepared in Example 1 of this invention;

[0029] Figure 2 This is a particle size distribution diagram of the titanium-based composite powder cold spraying raw material prepared in Example 1 of the present invention;

[0030] Figure 3 These are scanning electron microscope images of the surface microstructure of the diamond mechanically coated titanium powder composite coating prepared in Example 1 of this invention;

[0031] Figure 4 This is a cross-sectional scanning electron microscope image of the diamond mechanically coated titanium powder composite coating prepared in Example 1 of this invention;

[0032] Figure 5 These are the results of microhardness testing of the diamond mechanically coated titanium powder composite coatings prepared in Examples 1-3 and the coating prepared in Example 4 of this invention;

[0033] Figure 6 The graph shows the results of friction and wear tests on the diamond mechanically coated titanium powder composite coatings prepared in Examples 1-3 and the coating prepared in Example 4; where a is the average friction coefficient of the coating and b is the wear rate of the coating.

[0034] Figure 7 The images show the EIS test results of the diamond mechanically coated titanium powder composite coatings prepared in Examples 1-3 of this invention and the coating prepared in Example 4.

[0035] For those skilled in the art, other related figures can be obtained from the above figures without any creative effort. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below with reference to specific embodiments.

[0037] The titanium powder used in the following examples is ≥99.9wt%, and the impurities are Fe<0.002%, Ni<0.001%, Si<0.016%, Mn<0.008%, Mg<0.01%, and the diamond powder is micron-sized.

[0038] Example 1

[0039] A method for preparing a diamond mechanically coated titanium powder composite coating includes the following steps:

[0040] Step 1, powder premixing: Mix 500g of titanium powder and 55g of diamond powder to obtain a first mixture. Mechanically stir the first mixture for 0.1h to obtain a stirred first mixture. Add 5.5g of stearic acid particles to the stirred first mixture and continue mechanical stirring for 0.1h to obtain a premixed powder.

[0041] The titanium powder is spherical or near-spherical with a particle size of 5–25 μm; the diamond powder is irregularly shaped with a particle size of 0.1–5 μm.

[0042] Step 2, ball milling: The premixed powder is ball milled using a low-energy planetary ball mill at a ball-to-powder ratio of 3:1, a rotation speed of 200 rpm / min, and a milling time of 2 hours. The milled powder is then sieved and used as a raw material for titanium-based composite powder cold spraying. The particle size of the titanium-based composite powder cold spraying raw material is 5–30 μm. The ball milling process is intermittent, with each run lasting 0.2 hours followed by a 0.1-hour interval.

[0043] Step 3, cold spraying: Cold spraying is performed using the aforementioned titanium-based composite powder as the raw material. The spraying temperature is 800℃, the spraying pressure is 5MPa, and the powder feeding gas and main spraying gas are high-purity nitrogen, ensuring a deposition efficiency greater than 40%, to obtain the diamond mechanically coated titanium powder composite coating. The cold spraying process uses a titanium alloy metal plate as the substrate; the high-purity nitrogen gas has a nitrogen volume content of 99.99%.

[0044] The diamond mechanically coated titanium powder composite coating obtained in step 3 was subjected to microhardness testing. The test load was 300g and the holding time was 10s.

[0045] The diamond mechanically coated titanium powder composite coating obtained in step 3 was subjected to electrochemical corrosion impedance spectroscopy (EIS) testing in a 3.5 wt.% sodium chloride solution using a three-electrode method. The working electrode was the sample, the reference electrode was a saturated calomel electrode, and the auxiliary electrode was a platinum sheet electrode. Open-circuit potential tests were performed within a ±2.5 mV range. Polarization and impedance tests were both conducted at open-circuit potentials at a test frequency of 10 Hz. -2 ~10 5 Hz, amplitude is 5mV.

[0046] The diamond mechanically coated titanium powder composite coating obtained in step 3 was tested using a friction and wear testing machine with a load of 10N, a test time of 15min, a test length of 8mm, a friction distance of 40m, and φ6mm GCr15 steel balls as the friction pair.

[0047] Figure 1 These are scanning electron microscope (SEM) images of the morphology of the titanium-based composite powder cold spraying raw material prepared in Example 1 of this invention. Figure 1 It can be seen that the titanium-based composite powder cold spraying raw material is spherical, with diamond uniformly coated on the surface of the titanium powder, irregular shapes are diamond particles, and the carrier is spherical titanium powder;

[0048] Figure 2 This is a particle size distribution diagram of the titanium-based composite powder cold spraying raw material prepared in Example 1 of the present invention; from Figure 2 It can be seen that the particle size distribution of the titanium-based composite powder cold spraying raw material is 5-30μm. The particle size of the composite powder after diamond is coated on the surface of titanium powder is shown in the small peak on the left, which indicates that after coating with a layer of diamond, the remaining diamond is mixed in the titanium powder.

[0049] Figure 3 These are scanning electron microscope (SEM) images of the surface microstructure of the diamond mechanically coated titanium powder composite coating prepared in Example 1 of this invention; from Figure 3 It can be seen that in the diamond mechanically coated titanium powder composite coating after spraying, the diamond is distributed between the titanium particles;

[0050] Figure 4 These are cross-sectional scanning electron microscope images of the diamond mechanically coated titanium powder composite coating prepared in Example 1 of this invention; from Figure 4 It can be seen that the porosity of the diamond mechanically coated titanium powder composite coating is low; the white dots are diamond particles, which are evenly dispersed at the titanium-titanium interface.

[0051] Example 2

[0052] A method for preparing a diamond mechanically coated titanium powder composite coating includes the following steps:

[0053] Step 1, powder premixing: Mix 500g of titanium powder and 26g of diamond powder to obtain a first mixture. Mechanically stir the first mixture for 0.1h to obtain a stirred first mixture. Add 5.5g of stearic acid particles to the stirred first mixture and continue mechanical stirring for 0.1h to obtain a premixed powder.

[0054] The mass ratio of the added stearic acid particles to the first mixture after stirring is 1:95.6;

[0055] The titanium powder is spherical or near-spherical with a particle size of 5–25 μm; the diamond powder is irregularly shaped with a particle size of 0.1–5 μm.

[0056] Step 2, ball milling: The premixed powder is ball milled using a low-energy planetary ball mill at a ball-to-powder ratio of 3:1, a rotation speed of 200 rpm / min, and a milling time of 2 hours. The milled powder is then sieved and used as a raw material for titanium-based composite powder cold spraying. The particle size of the titanium-based composite powder cold spraying raw material is 5–30 μm. The ball milling process is intermittent, with each run lasting 0.2 hours followed by a 0.1-hour interval.

[0057] Step 3, cold spraying: Cold spraying is performed using the aforementioned titanium-based composite powder as the raw material. The spraying temperature is 800℃, the spraying pressure is 5MPa, and the powder feeding gas and main spraying gas are high-purity nitrogen, ensuring a deposition efficiency greater than 40%, to obtain the diamond mechanically coated titanium powder composite coating. The cold spraying process uses a titanium alloy metal plate as the substrate; the high-purity nitrogen gas has a nitrogen volume content of 99.99%.

[0058] The diamond mechanically coated titanium powder composite coating obtained in step 3 was subjected to microhardness testing. The test load was 300g and the holding time was 10s.

[0059] The diamond mechanically coated titanium powder composite coating obtained in step 3 was subjected to electrochemical corrosion impedance spectroscopy (EIS) testing in a 3.5 wt.% sodium chloride solution using a three-electrode method. The working electrode was the sample, the reference electrode was a saturated calomel electrode, and the auxiliary electrode was a platinum sheet electrode. Open-circuit potential tests were performed within a ±2.5 mV range. Polarization and impedance tests were both conducted at open-circuit potentials at a test frequency of 10 Hz. -2 ~10 5 Hz, amplitude is 5mV.

[0060] The diamond mechanically coated titanium powder composite coating obtained in step 3 was tested using a friction and wear testing machine with a load of 10N, a test time of 15min, a test length of 8mm, a friction distance of 40m, and φ6mm GCr15 steel balls as the friction pair.

[0061] Example 3

[0062] A method for preparing a diamond mechanically coated titanium powder composite coating includes the following steps:

[0063] Step 1, powder premixing: Mix 500g of titanium powder and 88g of diamond powder to obtain a first mixture. Mechanically stir the first mixture for 0.1h to obtain a stirred first mixture. Add 5.8g of stearic acid particles to the stirred first mixture and continue mechanical stirring for 0.1h to obtain a premixed powder.

[0064] The titanium powder is spherical or near-spherical with a particle size of 5–25 μm; the diamond powder is irregularly shaped with a particle size of 0.1–5 μm.

[0065] Step 2, ball milling: The premixed powder is ball milled using a low-energy planetary ball mill at a ball-to-powder ratio of 3:1, a rotation speed of 200 rpm / min, and a milling time of 2 hours. The milled powder is then sieved and used as a raw material for titanium-based composite powder cold spraying. The particle size of the titanium-based composite powder cold spraying raw material is 5–30 μm. The ball milling process is intermittent, with each run lasting 0.2 hours followed by a 0.1-hour interval.

[0066] Step 3, cold spraying: Cold spraying is performed using the titanium-based composite powder as the raw material. The spraying temperature is 800℃, the spraying pressure is 5MPa, and the powder feeding gas and main spraying gas are high-purity nitrogen to ensure a deposition efficiency greater than 40%, thereby obtaining the diamond mechanically coated titanium powder composite coating. The cold spraying process uses titanium metal as the substrate; the nitrogen volume content of the high-purity nitrogen gas is 99.99%.

[0067] The diamond mechanically coated titanium powder composite coating obtained in step 3 was subjected to microhardness testing. The test load was 300g and the holding time was 10s.

[0068] The diamond mechanically coated titanium powder composite coating obtained in step 3 was subjected to electrochemical corrosion impedance spectroscopy (EIS) testing in a 3.5 wt.% sodium chloride solution using a three-electrode method. The working electrode was the sample, the reference electrode was a saturated calomel electrode, and the auxiliary electrode was a platinum sheet electrode. Open-circuit potential tests were performed within a ±2.5 mV range. Polarization and impedance tests were both conducted at open-circuit potentials at a test frequency of 10 Hz. -2 ~10 5 Hz, amplitude is 5mV.

[0069] The diamond mechanically coated titanium powder composite coating obtained in step 3 was tested using a friction and wear testing machine with a load of 10N, a test time of 15min, a test length of 8mm, a friction distance of 40m, and φ6mm GCr15 steel balls as the friction pair.

[0070] Example 4 (Comparative Example)

[0071] A method for preparing a titanium powder coating includes the following steps:

[0072] Cold spraying is performed using the aforementioned titanium-based composite powder cold spraying material. The spraying temperature is 800℃, the spraying pressure is 5MPa, and the powder feeding gas and main spraying gas are high-purity nitrogen, ensuring a deposition efficiency greater than 40% to obtain a titanium powder coating. The cold spraying process uses titanium alloy metal as the substrate; the nitrogen volume content of the high-purity nitrogen gas is 99.99%. The titanium powder is spherical or near-spherical with a particle size of 5–25 μm.

[0073] The obtained titanium powder coating was subjected to microhardness testing with a test load of 300g and a holding time of 10s.

[0074] The obtained titanium powder coating was subjected to electrochemical corrosion impedance spectroscopy (EIS) testing in a 3.5 wt.% sodium chloride solution using a three-electrode method. The working electrode was the sample, the reference electrode was a saturated calomel electrode, and the auxiliary electrode was a platinum sheet electrode. Open-circuit potential tests were performed within a ±2.5 mV range. Polarization and impedance tests were both conducted at open-circuit potentials at a frequency of 10 Hz. -2 ~10 5 Hz, amplitude is 5mV.

[0075] The obtained titanium powder coating was tested using a friction and wear testing machine with a load of 10N, a test time of 15min, a test length of 8mm, a friction distance of 40m, and φ6mm GCr15 steel balls as the friction pair.

[0076] For ease of explanation, relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0077] Figure 5 These are microhardness results from Examples 1-3 and the comparative example of the present invention. Figure 5 It can be seen that the addition of diamond to the composite coating increases the microhardness value of the coating, and the microhardness value of the coating increases with the increase of diamond content.

[0078] Figure 6 These are friction and wear results from Examples 1-3 and the comparative example of the present invention. Figure 6 It can be seen that as the diamond content in the coating increases, the average friction coefficient and wear rate of the coating first decrease and then increase. Furthermore, Example 1 represents the optimal diamond content for the coating.

[0079] Figure 7 The images show the EIS test results of the diamond mechanically coated titanium powder composite coatings prepared in Examples 1-3 and the coating prepared in Example 4. It can be seen that the corrosion resistance of the coating is improved with the addition of diamond.

[0080] The present invention has been described above by way of example. It should be noted that any simple modifications, alterations or other equivalent substitutions that can be made by those skilled in the art without creative effort without departing from the core of the present invention fall within the protection scope of the present invention.

Claims

1. A method for preparing a diamond mechanically coated titanium powder composite coating, characterized in that, Includes the following steps: Step 1, powder premixing: titanium powder and diamond powder are mixed to obtain a first mixture, and the first mixture is mechanically stirred for 0.1 to 1 hour to obtain a stirred first mixture; The titanium powder is spherical or nearly spherical; the diamond powder is irregularly shaped. Stearic acid granules are added to the first mixture after stirring, and mechanical stirring is continued for 0.1 to 1 hour to obtain a premixed powder. In the first mixture, the mass ratio of titanium powder to diamond powder is 100:(1-20); The mass ratio of the added stearic acid particles to the first mixture after stirring is (1-10):100; Step 2, ball milling: The premixed powder is ball milled using a low-energy planetary ball mill with a ball-to-material ratio of 3 to 10:1, a rotation speed of 100 to 400 rpm, and a milling time of 1 to 6 hours. The ball-milled powder is then sieved and used as a raw material for cold spraying titanium-based composite powder. The ball milling process is an intermittent ball milling process, with each run lasting 0.1 to 0.5 hours and an interval of 0.1 to 0.3 hours. Step 3, cold spraying: cold spraying is performed using the titanium-based composite powder cold spraying material. The spraying temperature is 700℃~900℃, the spraying pressure is 3~5MPa, and the powder feeding gas and the main spraying gas are high-purity nitrogen to ensure that the deposition efficiency is greater than 40% to obtain the diamond mechanically coated titanium powder composite coating. The hardness of the diamond mechanically coated titanium powder composite coating is 180-210 MPa.

2. The method for preparing a diamond mechanically coated titanium powder composite coating according to claim 1, characterized in that, The titanium powder has a particle size of 5-30 μm, and the diamond powder has a particle size of 0.1-5 μm.

3. The method for preparing a diamond mechanically coated titanium powder composite coating according to claim 1, characterized in that, The high-purity nitrogen gas has a nitrogen volume content of 99.99% or higher.

4. The method for preparing a diamond mechanically coated titanium powder composite coating according to claim 1, characterized in that, The particle size of the titanium-based composite powder cold spraying raw material is 5–30 μm.

5. The method for preparing a diamond mechanically coated titanium powder composite coating according to claim 1, characterized in that, The cold spraying process uses titanium metal as the substrate.

6. The method for preparing a diamond mechanically coated titanium powder composite coating according to claim 5, characterized in that, The substrate is a titanium alloy metal plate TC4.

7. A diamond mechanically coated titanium powder composite coating prepared by a method according to any one of claims 1 to 6.

8. The application of the diamond mechanically coated titanium powder composite coating according to claim 7 in the preparation of corrosion-resistant and wear-resistant materials.

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