Titanium-based composite material powder, titanium-based composite material product and preparation method thereof

Abstract

The present invention provides a titanium-based composite material powder, a titanium-based composite material product and a preparation method thereof. The preparation method of the titanium-based composite material powder is based on the PCS method. In the preparation steps, the matrix powder and the reinforcement phase particles are first planetarily ball-milled to obtain a mixed powder; then the mixed powder is placed in a PCS device and operated for a certain period of time under a protective atmosphere; thereafter, the obtained mixed powder is sieved to obtain the desired titanium-based composite material powder. The titanium-based composite material powder has good sphericity, low cost, and good fluidity. Moreover, a metallurgical bond can be formed between the matrix powder and the reinforcement phase particles, and can be well adapted to the needs of additive manufacturing.

Description

Technical Field

[0001] The present invention relates to the technical field of metal materials and preparation thereof, and in particular to titanium-based composite material powder, titanium-based composite material parts and preparation methods thereof. Background Art

[0002] Titanium or titanium alloys have the characteristics of light weight, high strength, good biocompatibility, and low elastic modulus, and have attracted widespread attention from researchers at home and abroad. At this stage, they have been widely used in the fields of automobiles, ships, aerospace, medical devices, etc. However, with the rapid development of modern industry and technology in recent years, more stringent requirements have been put forward for high-performance materials in terms of wear resistance, corrosion resistance, high strength and toughness, etc. The introduction of ceramic reinforcement particles with excellent strength, hardness, and wear resistance into the titanium or titanium alloy matrix with good plasticity and toughness to produce titanium-based composites can meet the above requirements. Titanium-based composites have become one of the most promising structural materials in the fields of aerospace and other fields.

[0003] Compared to traditional manufacturing processes, additive manufacturing technology, based on the principle of layered manufacturing and layer-by-layer stacking, boasts high precision, speed, flexibility, small-batch customization, and ease of preparing complex shapes. Selective Laser Melting (SLM), a type of additive manufacturing technology, is considered one of the most promising metal material processing and preparation technologies, and it also opens up a new approach for the preparation of high-performance titanium-based composites. Currently, the main factors restricting the development of additive manufacturing titanium-based composites are the preparation technology of raw material powders and their cost control. To this end, a large amount of low-cost technology development and research has been carried out both domestically and internationally, such as plasma spheroidization and mechanical shaping. However, these technologies also have many limitations. For example, the plasma spheroidization method has complex equipment, is expensive, and has low efficiency; mechanical ball milling powder composites have unsatisfactory results and low powder yield.

[0004] Therefore, it is urgent to develop new titanium-based composite powder preparation technology. Summary of the Invention

[0005] The main purpose of the present invention is to provide a titanium-based composite material powder, a titanium-based composite material product and a preparation method thereof. The preparation method of the titanium-based composite material powder is based on the PCS method. The prepared titanium-based composite material powder has good sphericity, low cost, and good fluidity. Moreover, a metallurgical bond can be formed between the matrix powder and the reinforcement phase particles, which can be well adapted to the needs of additive manufacturing.

[0006] In order to achieve the above objectives, according to a first aspect of the present invention, a method for preparing titanium-based composite material powder using a PCS method is provided.

[0007] The method for preparing titanium-based composite material powder by using the PCS method comprises the following steps:

[0008] Planetary ball milling is performed on the matrix powder and the reinforcement phase particles to obtain a mixed powder; wherein the matrix powder is titanium or titanium alloy powder;

[0009] The mixed powder is placed in a PCS device and processed at a speed of 2000 to 7000 r / min for 1 to 240 min under a protective atmosphere;

[0010] The treated mixed powder is sieved to obtain the desired titanium-based composite material powder.

[0011] Furthermore, the planetary ball milling comprises the following steps:

[0012] Weigh the matrix powder, reinforcement phase particles and grinding balls and place them into a planetary ball mill;

[0013] Under protective atmosphere, the planetary ball mill is operated at 20-200 r / min, and the ball milling time is 0.2-60 h;

[0014] After the operation is completed, coarse screening is performed to remove the grinding balls to obtain the mixed powder;

[0015] Preferably, the mass of the reinforcement phase particles is within 20% of the total mass of the matrix powder and the reinforcement phase particles;

[0016] Preferably, the planetary ball mill is operated at 40 to 100 r / min, and the ball milling time is 4 to 12 hours.

[0017] Furthermore, the grinding balls are weighed according to a ball-to-material ratio of x:y, where the mass of the grinding balls is: the total mass of the matrix powder and the reinforcement phase particles; wherein x and y are both arbitrary natural numbers;

[0018] Preferably, the grinding balls include but are not limited to zirconium oxide, stainless steel, and aluminum oxide grinding balls;

[0019] Preferably, the particle size of the grinding balls is ≤30 mm; preferably, grinding balls of different diameters are selected for mixing;

[0020] Preferably, grinding balls with a diameter of 5 mm and grinding balls with a diameter of 10 mm are mixed in a ratio of 1:1;

[0021] Preferably, the diameter of the grinding balls is 10 mm.

[0022] Furthermore, the PCS equipment has a rotation speed of 3000-4000 r / min and a processing time of 5-20 min;

[0023] Preferably, the protective gas in the PCS equipment includes but is not limited to argon and nitrogen; preferably argon.

[0024] Preferably, the protective gas during the planetary ball milling process includes but is not limited to argon, nitrogen, and hydrogen.

[0025] Furthermore, the titanium powder includes but is not limited to hydrogenated dehydrogenated titanium powder and atomized titanium powder; the titanium alloy powder includes but is not limited to Ti-6Al-4V alloy powder, TA15 alloy powder and TC11 alloy powder;

[0026] Preferably, the particle size of the matrix powder is 1 to 100 μm;

[0027] Preferably, the particle size of the matrix powder is 15 to 60 μm.

[0028] Furthermore, the reinforcing phase particles include but are not limited to TiB2, TiB, TiC, CaBx, SiC, and carbon nanotubes; wherein CaBx includes CaB 1.5 , CaB2, CaB6;

[0029] Preferably, the particle size of the reinforcement phase particles is smaller than that of the matrix powder, and the particle size of the reinforcement phase particles is 0.2 to 30 μm;

[0030] Preferably, the particle size of the reinforcement phase particles is 0.2 to 15 μm.

[0031] In order to achieve the above object, according to a second aspect of the present invention, a titanium-based composite material powder is provided.

[0032] The titanium-based composite material powder prepared by the preparation method as described above comprises a matrix powder and reinforcement phase particles wrapped on the surface thereof; wherein the matrix powder is titanium or titanium alloy powder; the reinforcement phase particles include but are not limited to TiB2, TiB, TiC, CaBx, SiC, carbon nanotubes; wherein CaBx includes CaB 1.5 , CaB2, CaB6;

[0033] Preferably, the titanium-based composite material powder includes but is not limited to Ti / TiBx, Ti / TiC, and Ti / CaBx composite material powder; wherein Ti / TiBx includes Ti / TiB, Ti / TiB2; Ti / CaBx includes Ti / CaB 1.5 , Ti / CaB2, Ti / CaB6.

[0034] In order to achieve the above-mentioned object, according to a third aspect of the present invention, a method for preparing a titanium-based composite material part is provided.

[0035] The preparation method of the titanium-based composite material product comprises the following steps:

[0036] The titanium-based composite material powder is prepared by the above-mentioned preparation method;

[0037] The titanium-based composite material powder is placed in a selective laser melting device and printed to obtain a titanium-based composite material part; wherein the laser power is 75 to 350 W, the scanning speed is 200 to 1500 mm / s, the scanning interval is 0.05 to 0.15 mm, and the protective gas includes but is not limited to argon and nitrogen;

[0038] The titanium-based composite material product is subjected to vacuum heat treatment, wherein the temperature is 200-1300° C. and the time is 0.2-60 hours.

[0039] Furthermore, the laser power is 125-225W, the scanning speed is 900-mm / s, the scanning spacing is 0.10-0.14mm, and the volume energy density is 60-80J / mm 3 , the protective gas is argon;

[0040] Preferably, the heat treatment temperature is 500-850° C., and the time is 1.5-6 hours.

[0041] In order to achieve the above-mentioned objective, according to a fourth aspect of the present invention, a titanium-based composite material part is provided.

[0042] The titanium-based composite material parts prepared by the preparation method as described above include but are not limited to Ti / TiBx, Ti / TiC, and Ti / CaBx composite material parts; wherein Ti / TiBx includes Ti / TiB, Ti / TiB2; Ti / CaBx includes Ti / CaB 1.5 , Ti / CaB2, Ti / CaB6.

[0043] Beneficial effects of the present invention:

[0044] The titanium-based composite powder produced by the preparation method provided herein exhibits excellent flowability and a metallurgical bond between the reinforcement particles and the matrix powder, making it well suited for additive manufacturing of titanium-based composite materials. Furthermore, the titanium-based composite powder can be prepared from a wide range of raw materials, allowing the use of a variety of titanium alloy powders as the matrix powder and a wide range of reinforcement particles in varying amounts.

[0045] 2. The raw materials used in the titanium-based composite material powder preparation method provided by the present invention can be selected from hydrogenated dehydrogenated titanium powder, and the raw material powder and the reinforcing phase particles are mixed in a selected manner. Compared with the traditional atomization method for preparing titanium-based composite material powder, the cost can be reduced by more than 50%. In addition, the preparation method of the present invention has a high production efficiency and can reach an annual output of 72 tons. The annual output of a single device of the traditional atomization powder making solution is only 25 tons.

[0046] 3. The titanium-based composite powder provided by the present invention achieves a metallurgical bond between the reinforcement phase particles and the matrix powder, thus avoiding cracking during additive manufacturing due to a weak bond between the two. Furthermore, the present invention has designed an additive manufacturing process tailored to the titanium-based composite powder produced. The resulting additively manufactured parts exhibit excellent mechanical properties and can achieve a density exceeding 99%. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0048] Figure 1 This is a morphology diagram of the Ti / TiB2 composite material powder in Example 1 provided by the present invention;

[0049] Figure 2 The XRD pattern of the Ti / TiB2 composite SLM product in Example 1 provided by the present invention;

[0050] Figure 3 This is the room temperature tensile stress-strain curve of the Ti / TiB2 composite SLM part in Example 1 provided by the present invention;

[0051] Figure 4 This is the fracture morphology of the Ti / TiB2 composite material SLM product after tensile fracture in Example 1 provided by the present invention;

[0052] Figure 5 The average friction coefficient and volume wear rate of the Ti / TiB2 composite SLM parts provided in Example 1 of the present invention;

[0053] Figure 6 This is a three-dimensional white light analysis diagram of the wear scar of the SLM pure titanium part in Example 1 provided by the present invention;

[0054] Figure 7 This is a three-dimensional white light analysis diagram of the wear scar of the SLM Ti / TiB2 workpiece in Example 1 provided by the present invention;

[0055] Figure 8 This is a three-dimensional white light analysis diagram of the wear scar of the forged Ti-6Al-4V workpiece in Example 1 provided by the present invention;

[0056] Figure 9 This is an aerospace turbine sample made from the Ti / TiB2 composite material powder in Example 1 provided by the present invention. DETAILED DESCRIPTION

[0057] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0058] To overcome the deficiencies in the prior art, according to a specific embodiment of the present invention, a method for preparing titanium-based composite material powder using a particle composite and shaping system (PCS) method is provided to achieve the preparation of high-performance, low-cost titanium-based composite material powder suitable for additive manufacturing.

[0059] The method for preparing titanium-based composite material powder using the PCS method in the present invention specifically comprises the following steps:

[0060] S1, planetary ball milling the matrix powder and the reinforcement phase particles to obtain a mixed powder; specifically comprising the following steps:

[0061] S1-1, weighing matrix powder and reinforcement phase particles, and placing them together in a planetary ball mill; wherein the matrix powder can be titanium powder or titanium alloy powder;

[0062] S1-2, weighing grinding balls according to a ball-to-material ratio of x:y (mass of grinding balls: total mass of matrix powder and reinforcement phase particles); wherein x and y are arbitrary natural numbers; the grinding balls include but are not limited to zirconia, stainless steel, and alumina grinding balls; and the particle size of the grinding balls is ≤30 mm;

[0063] S1-3, injecting protective gas into the planetary ball mill; wherein the protective gas includes but is not limited to argon, nitrogen, and hydrogen;

[0064] S1-4, the planetary ball mill runs at 20-200 r / min, and the ball milling time is 0.2-60 h;

[0065] S1-5, after the operation is completed, open the can in the glove box, take out the powder, and sieve out the grinding balls, such as using a 60-mesh coarse sieve, to obtain a mixed powder.

[0066] In an embodiment of the present invention, the matrix powder can be mixed with the reinforcement phase particles in any mass ratio. To achieve better results, as a specific embodiment of the present invention, the mass of the reinforcement phase particles is within 20% of the total mass of the matrix powder and the reinforcement phase particles.

[0067] In certain embodiments of the present invention, the planetary ball mill is operated at 40 to 100 r / min and the ball milling time is 4 to 12 h, which can achieve better results.

[0068] In the embodiment of the present invention, in order to achieve better results, grinding balls of different diameters can be selected for mixing.

[0069] As a specific embodiment of the present invention, grinding balls with a diameter of 5 mm and grinding balls with a diameter of 10 mm can be selected and mixed in a ratio of 1:1.

[0070] As a specific embodiment of the present invention, grinding balls with a diameter of 10 mm can also be directly selected.

[0071] In the embodiments of the present invention, titanium powder includes but is not limited to hydrogenated dehydrogenated titanium powder and atomized titanium powder;

[0072] Titanium alloy powder includes but is not limited to Ti-6Al-4V alloy powder, TA15 alloy powder, and TC11 alloy powder.

[0073] In an embodiment of the present invention, the particle size of the matrix powder may be 1 to 100 μm.

[0074] As a specific embodiment of the present invention, the particle size of the matrix powder is 15 to 60 μm to obtain better effects.

[0075] In the embodiment of the present invention, the reinforcement phase particles include but are not limited to TiB2, TiB, TiC, CaBx, SiC, carbon nanotubes; wherein CaBx includes CaB 1.5 , CaB2, CaB6;

[0076] The particle size of the reinforcement phase particles is smaller than that of the matrix powder, and the particle size of the reinforcement phase particles may be 0.2 to 30 μm.

[0077] As a specific embodiment of the present invention, the particle size of the reinforcement phase particles is 0.2 to 15 μm.

[0078] S2, placing the obtained mixed powder into a PCS device, and treating it at a speed of 2000 to 7000 r / min for 1 to 240 min under a protective atmosphere; wherein the protective gas includes but is not limited to argon and nitrogen.

[0079] As a specific implementation, the protective gas is argon, which is more conducive to the control of interstitial impurity elements.

[0080] In an embodiment of the present invention, the rotation speed of the PCS equipment is 3000-4000 r / min, and the processing time is 5-20 min.

[0081] S3, sieving the treated mixed powder to obtain the desired titanium-based composite material powder.

[0082] According to a specific embodiment of the present invention, a titanium-based composite material powder is further provided. The titanium-based composite material powder is prepared based on the above-mentioned preparation method.

[0083] The titanium-based composite material powder includes a matrix powder and reinforcement phase particles wrapped on the surface of the matrix powder; wherein the matrix powder is titanium or titanium alloy powder; the reinforcement phase particles include but are not limited to TiB2, TiB, TiC, CaBx, SiC, carbon nanotubes; wherein CaBx includes CaB 1.5 , CaB2, CaB6.

[0084] In the embodiment of the present invention, titanium-based composite material powders include but are not limited to Ti / TiBx, Ti / TiC, and Ti / CaBx composite material powders; wherein Ti / TiBx includes Ti / TiB, Ti / TiB2; Ti / CaBx includes Ti / CaB 1.5 、Ti / CaB2、Ti / CaB6。 。

[0085] According to a specific embodiment of the present invention, a method for preparing a titanium-based composite material part is also provided.

[0086] The preparation method of the titanium-based composite material product specifically comprises the following steps:

[0087] Step 1, preparing titanium-based composite material powder using the above-mentioned preparation method;

[0088] Step 2, placing the titanium-based composite material powder into a selective laser melting device for printing to obtain a titanium-based composite material part; specifically comprising the following steps:

[0089] Step 2-1: Design the shape of the titanium-based composite material part to be prepared, slice it using Magics software, input the parameters required for printing, such as scanning power, scanning spacing, and scanning rate, and obtain the printing shape slice file; wherein, the laser power is 75-350W, the scanning speed is 200-1500mm / s, and the scanning spacing is 0.05-0.15mm;

[0090] Step 2-2, placing titanium-based composite material powder into a powder bin;

[0091] Step 2-3, the selective laser melting equipment is vacuumed or atmosphere treated; wherein the protective gas includes but is not limited to argon and nitrogen;

[0092] Steps 2-4: Start printing, and then cool naturally after completion, maintaining a protective atmosphere;

[0093] Step 2-5: cutting the printed part along the base of the substrate to obtain a titanium-based composite material part;

[0094] Step 3: performing vacuum heat treatment on the titanium-based composite material product in a vacuum heat treatment device; wherein the temperature is 200 to 1300° C. and the time is 0.2 to 60 hours.

[0095] In the embodiment of the present invention, in order to obtain better printing effect, the laser power is 125~225W, the scanning speed is 900~mm / s, the scanning spacing is 0.10~0.14mm, and the volume energy density is 60~80J / mm 3 , the protective gas is argon.

[0096] In an embodiment of the present invention, in order to obtain a better heat treatment effect, the heat treatment temperature may be 500-850° C., and the time may be 1.5-6 hours.

[0097] According to a specific embodiment of the present invention, a titanium-based composite material part is also provided.

[0098] Titanium-based composite materials are prepared by the above-mentioned preparation method, and the titanium-based composite materials include but are not limited to Ti / TiBx, Ti / TiC, and Ti / CaBx composite materials; wherein Ti / TiBx includes Ti / TiB, Ti / TiB2; Ti / CaBx includes Ti / CaB 1.5 、Ti / CaB2、Ti / CaB6。 。

[0099] The titanium-based composite material parts prepared in the present invention have high tensile strength and excellent toughness, and can meet the demand for customized high-strength and high-toughness titanium-based composite materials in aerospace, national defense and military industry, and biomedical materials.

[0100] The titanium-based composite material powder, titanium-based composite material product and preparation method thereof in the present invention will be further described below with reference to specific embodiments.

[0101] Example 1

[0102] Step 1: Weigh the particle size range D 10 =15.4μm, D 50 =34.1μm, D 90 =57.8μm hydrogenated dehydrogenated titanium powder 4750g, weigh the particle size range D 10 =3.2μm, D 50 =6.7μm, D 90 = 250g of 9.2μm TiB2 reinforcement particles;

[0103] Step 2: Weigh 1000 g of 4 mm zirconia grinding balls, mix them with the powder, and place them into a planetary ball mill in an argon atmosphere in a glove box. The sealed ball mill is taken out of the glove box and placed on a planetary ball mill. Select 60 r / min and the ball milling time is 12 h. After completion, open the jar in the glove box and use a 60-mesh primary sieve to remove the zirconia grinding balls to obtain a mixed powder.

[0104] Step 3: Place the obtained mixed powder into the PCS equipment and process the powder at 3000 r / min for 10 min, using argon atmosphere protection.

[0105] Step 4: The obtained powder is sieved through a -270 mesh + 800 mesh sieve to obtain a Ti / TiB2 composite material powder suitable for additive manufacturing.

[0106] The test shows that the powder flowability of the Ti / TiB2 composite material prepared by the present invention reaches 43.5s / 50g, and the particle size range is D 10 =19.2μm, D 50 =32.0μm, D 90 =50.1μm, TiB2 particles are tightly combined with Ti, and the powder morphology of the prepared Ti / TiB2 composite material is shown in the figure. Figure 1 shown.

[0107] Step 5: The obtained Ti / TiB2 composite material powder is placed in a selective laser melting device and printed at a laser power of 125 W, a scanning speed of 900 mm / s, and a scanning pitch of 0.12 mm to obtain an SLM-Ti / TiB2 part.

[0108] Step 6: Cut the SLM-Ti / TiB2 part from the substrate, place it in a vacuum heat treatment furnace, and heat it to 650°C at a rate of 5°C / min. Hold the temperature for 2 hours and allow it to cool in the furnace. This yields the final part.

[0109] After testing, the density of SLM-Ti / TiB2 parts reached 99.8±0.4%.

[0110] After testing, the XRD test results are as follows Figure 2 As shown, no TiB2 or TiB diffraction peak was observed in the diffraction peak. This is mainly due to the low TiB2 content (<5%), which is difficult to detect accurately by XRD.

[0111] After testing, the room temperature tensile strength of SLM-Ti / TiB2 parts after heat treatment is as high as 995MPa, and the elongation is 8.2%, reaching the highest level reported in domestic and foreign literature, such as Figure 3 As shown, the fracture morphology is Figure 4 shown.

[0112] The friction coefficient and volume wear rate of SLM-Ti / TiB2 parts were 0.73 and 0.44×10 -12 m 3 / Nm, compared with SLM CP-Ti, its friction coefficient and volume wear rate are reduced by 22.3% and 30.2%, respectively. Compared with forged Ti-6Al-4V alloy, the friction coefficient is similar, and the volume wear rate is reduced by 10.2%. Figure 5 、 Figure 6 shown.

[0113] Based on the Ti / TiB2 composite material powder prepared by the present invention, aerospace turbine parts are prepared, such as Figure 7 shown.

[0114] The present invention also conducts a comparative analysis between the titanium-based composite material powder prepared in Example 1 and the titanium-based composite material powder obtained in the prior art to further illustrate the titanium-based composite material powder of the present invention and its preparation method.

[0115] Traditional titanium-based composite material powders need to be prepared through a smelting-atomization powder making method. The entire process is relatively long. In addition, since titanium is a highly active metal during the smelting process, the reinforcing phase particles are prone to react with titanium during the smelting process. When added in large quantities, it is easy to cause component segregation, affecting the uniformity of the final powder. In the solution provided by the present invention, the matrix powder and the reinforcing phase particles are evenly mixed, and the interstitial element content is controllable. In comparison, the cost is reduced by more than 50%, and the range of raw materials is wider. The interstitial element content of the powder can be controlled, and the production efficiency reaches 72 tons / year, which is a significant improvement compared to the 25 tons / year production efficiency of traditional atomized powder.

[0116] Compared to a mixture of titanium alloy powder and reinforcement particles, the solution provided by the present invention has a uniform composition and a tight bond between the reinforcement particles and the matrix, meeting the requirements of laser additive manufacturing and avoiding cracking caused by loose bonding between the two during the preparation process. Mixed powders of titanium alloy powder and reinforcement particles, on the other hand, are prone to uneven mixing and cracking during printing.

[0117] The foregoing description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed herein are intended to be encompassed within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for preparing titanium-based composite material powder using the PCS method, characterized in that: The titanium-based composite material powder is Ti / TiB2, Ti / CaB 1.5 Or Ti / CaB2 composite material powder; the titanium-based composite material powder includes a matrix powder and reinforcement phase particles wrapped on its surface by metallurgical bonding; wherein the matrix powder is hydrogenated dehydrogenated titanium powder, and the reinforcement phase particles are TiB2, CaB 1.5 or CaB2; The method for preparing the titanium-based composite material powder comprises the following steps: Planetarily ball milling the matrix powder and the reinforcement phase particles to obtain a mixed powder; wherein the mass of the reinforcement phase particles is within 20% of the total mass of the matrix powder and the reinforcement phase particles; The mixed powder is placed in a PCS device, which is a particle compounding and shaping system, and processed at a speed of 2000-7000 rpm for 1-240 min under a protective atmosphere; The treated mixed powder is sieved to obtain the desired titanium-based composite material powder.

2. The method according to claim 1, wherein The planetary ball milling comprises the following steps: Weigh the matrix powder, reinforcement phase particles and grinding balls and place them into a planetary ball mill; Under protective atmosphere, the planetary ball mill is operated at 20~200r / min, and the ball milling time is 0.2~60h; After the operation is completed, coarse screening is performed to remove the grinding balls to obtain the mixed powder.

3. The method according to claim 2, wherein The planetary ball mill runs at 40~100r / min, and the ball milling time is 4~12h.

4. The method according to claim 2, wherein The grinding balls are weighed according to a ball-to-material ratio of x:y, which is the mass of the grinding balls: the total mass of the matrix powder and the reinforcement phase particles; wherein x and y are both arbitrary natural numbers.

5. The method according to claim 2, wherein The grinding balls include zirconium oxide grinding balls, stainless steel grinding balls or aluminum oxide grinding balls.

6. The method according to claim 2, wherein The diameter of the grinding balls is ≤30 mm.

7. The method according to claim 2, wherein Grinding balls of different diameters were selected for mixing.

8. The method according to claim 7, wherein Select grinding balls with a diameter of 5 mm and grinding balls with a diameter of 10 mm and mix them in a ratio of 1:

1.

9. The method according to claim 6, wherein The diameter of the grinding balls is 10 mm.

10. The method according to claim 1 or 2, wherein: The speed of PCS equipment is 3000~4000r / min, and the processing time is 5~20min.

11. The method according to claim 1 or 2, wherein: The protective gas in PCS equipment includes argon or nitrogen.

12. The method according to claim 11, wherein The protective gas in PCS equipment is argon.

13. The method according to claim 2, wherein The protective gas during planetary ball milling includes argon, nitrogen or hydrogen.

14. The method according to claim 1, wherein The particle size of the matrix powder is 1-100 μm.

15. The method according to claim 14, wherein The particle size of the matrix powder is 15-60 μm.

16. The method according to claim 1, wherein The particle size of the reinforcement phase particles is smaller than that of the matrix powder, and the particle size of the reinforcement phase particles is 0.2-30 μm.

17. The method according to claim 16, wherein The particle size of the reinforcement phase particles is 0.2-15 μm.

18. A method for preparing a titanium-based composite material part, characterized in that: The following steps are involved: The titanium-based composite material powder is prepared by the method according to any one of claims 1 to 17; The titanium-based composite material powder is placed in a selective laser melting device for printing to obtain a titanium-based composite material part; wherein the laser power is 75-350W, the scanning speed is 200-1500mm / s, the scanning pitch is 0.05-0.15mm, and the shielding gas includes argon or nitrogen; The titanium-based composite material product is subjected to vacuum heat treatment, wherein the temperature is 200-1300° C. and the time is 0.2-60 hours.

19. The preparation method according to claim 18, characterized in that Laser power is 125~225W, scanning speed is 900~1500mm / s, scanning spacing is 0.10~0.14mm, and volume energy density is 60~80J / mm 3 , the protective gas is argon.

20. The preparation method according to claim 18, wherein the heat treatment temperature is 500-850°C and the time is 1.5-6 hours.

21. The titanium-based composite material product obtained by the preparation method according to any one of claims 18 to 20, characterized in that: The titanium-based composite material parts include Ti / TiB2, Ti / CaB 1.5 Or Ti / CaB2 composite parts.

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