A method for preparing a titanium-based composite material with uniform hardness

Abstract

This invention discloses a method for preparing a titanium-based composite material with uniform hardness. The method includes: 1. ball milling and mixing titanium-based spherical powder and graphite powder to obtain a uniformly mixed graphite-titanium-based powder; 2. subjecting the graphite-titanium-based mixed powder to surface carburizing treatment to obtain surface-carburized titanium-based spherical powder; 3. subjecting the surface-carburized titanium-based spherical powder to spark plasma sintering. This invention combines ball milling and surface carburizing processes, resulting in graphite powder being uniformly distributed on the surface of the titanium-based spherical powder and graphite carbon atoms penetrating into the surface layer of the titanium-based spherical powder. This forms a structure in which the reinforcing TiC phase is distributed at both the grain boundaries and within the grains of the titanium-based composite material, thereby synergistically strengthening the titanium-based composite material and improving its surface hardness and uniformity. Simultaneously, it alleviates the deterioration of the room-temperature plasticity of the titanium-based composite material, achieving optimized strength-plasticity matching. The preparation process is simple, highly operable, and has low production costs, making it suitable for large-scale industrial applications.

Description

Technical Field

[0001] This invention belongs to the field of titanium-based alloy material preparation technology, specifically relating to a method for preparing a titanium-based composite material with uniform hardness. Background Technology

[0002] Titanium and titanium alloys are widely used in industrial and commercial fields, including aerospace, chemical engineering, surgical implants, food processing, and marine applications. Their success in these applications stems from a remarkable combination of high specific strength (strength-to-weight ratio), excellent mechanical properties, superior corrosion resistance, and biocompatibility. However, the lower Young's modulus, wear resistance, and heat resistance of titanium and titanium alloys compared to steel and nickel-based alloys limit their applications. The emergence of titanium-based composites offers a new option to overcome these shortcomings. With the aerospace industry's increasing demands for lightweight and energy-efficient materials, titanium-based composites are considered the preferred structural material to replace titanium alloys. Currently, commonly used methods for preparing titanium-based composites can be categorized into liquid-phase methods, solid-phase methods, and deposition processes. Liquid-phase methods mainly include stirred casting, selective laser melting, and pressure infiltration; solid-phase methods mainly include powder metallurgy, friction stir welding, template methods, and molecular-level mixing; deposition processes mainly include electrochemical deposition, cold spray forming, and in-situ synthesis. Due to the high chemical reactivity of titanium and titanium alloys, traditional casting metallurgy and deposition processes are unsuitable for preparing titanium-based composites. Powder metallurgy, which involves mixing metal powder with reinforcing phases in a mixing device, pressing it into a mold to form the desired shape, and then sintering it, has become one of the simplest and mainstream methods for preparing titanium-based composites. Traditional powder metallurgy methods typically use continuous or discontinuous reinforcing phases such as ceramic particles (SiC, TiC, TiB), carbon nanotubes, and carbon fibers to prepare high-performance titanium-based composites. However, many problems still exist in the preparation of titanium-based composites using powder metallurgy, such as the uniformity of mixing between the reinforcing phase and the matrix powder during the powder mixing process, and the dispersion of the reinforcing phase. Taking the traditional ball milling method as an example, the agglomeration of the reinforcing phase on the powder surface remains a problem that urgently needs to be solved. Furthermore, in the prepared composites, the reinforcing phase is often distributed at the grain boundaries. Although the reinforcing phase at the grain boundaries can improve the strength of the composite by refining the grains and strengthening the grain boundaries, the large difference in the coefficient of thermal expansion between the reinforcing phase and the matrix can cause plasticity deterioration, ultimately resulting in a severe mismatch between strength and plasticity in the prepared composite. In addition, since most of the reinforcing phase is concentrated at the grain boundaries, the overall hardness of the composite exhibits significant inhomogeneity. Summary of the Invention

[0003] The technical problem to be solved by this invention is to provide a method for preparing titanium-based composite materials with uniform hardness, addressing the shortcomings of the prior art. This method combines ball milling and surface carburizing processes in a two-step process to ensure that graphite powder is evenly distributed on the surface of titanium-based spherical powder, and that carbon atoms from the graphite powder penetrate into the surface layer of the titanium-based spherical powder. This forms a structure in which the reinforcing phase TiC phase is distributed at both the grain boundaries and within the grains of the titanium-based composite material, thereby synergistically strengthening the titanium-based composite material and improving the surface hardness and uniformity of the composite material. Simultaneously, it alleviates the deterioration of the room-temperature plasticity of the titanium-based composite material, achieving optimized strength-plasticity matching and solving the problem of uneven distribution of the reinforcing phase affecting the strength, plasticity, and hardness properties of the titanium-based composite material.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for preparing a titanium-based composite material with uniform hardness, characterized in that the method includes the following steps:

[0005] Step 1: Preparation of graphite-titanium-based mixed powder: Titanium-based spherical powder with uniform particle size is ball-milled and mixed with graphite powder, so that the graphite powder continuously coats the surface of the titanium-based spherical powder to obtain a uniformly mixed graphite-titanium-based mixed powder; the titanium-based spherical powder is titanium or titanium alloy powder.

[0006] Step 2: Surface carburizing of titanium-based spherical powder: Add ethanol solution to the graphite-titanium-based mixed powder obtained in Step 1 and stir to form a slurry. Then place it in a vacuum furnace for surface carburizing treatment while removing the ethanol to obtain surface carburized titanium-based spherical powder.

[0007] Step 3, Sintering and Shaping: The surface-carburized titanium-based spherical powder obtained in Step 2 is subjected to spark plasma sintering to obtain a titanium-based composite material with uniform hardness.

[0008] This invention employs a two-step method. The first step involves ball milling titanium-based spherical powder and graphite powder together. The high-speed impact during ball milling causes graphite powder to continuously coat the surface of the titanium-based spherical powder, resulting in a uniformly mixed graphite-titanium-based powder. The second step involves surface carburizing of the graphite-titanium-based powder, which allows carbon atoms from the graphite powder to dissolve into the surface layer of the titanium-based spherical powder. Finally, spark plasma sintering is performed to obtain a titanium-based composite material with high overall uniformity. Compared to traditional methods for preparing titanium-based composite materials, this invention combines ball milling and surface carburizing processes. This two-step method ensures that graphite powder is uniformly distributed on the surface of the titanium-based spherical powder, while carbon atoms dissolve and are uniformly distributed within the titanium matrix. After spark plasma sintering, the graphite powder on the surface of the titanium-based spherical powder and the carbon atoms dissolved within it react with the titanium matrix to form a reinforcing TiC phase. This creates a two-tiered distribution of the TiC phase at both the grain boundaries and within the grains of the titanium-based composite material, synergistically strengthening the composite and improving its strength. Simultaneously, the grain boundary TiC phase and the intragranular TiC phase provide a dual barrier against dislocations, and the discontinuous TiC at the grain boundaries alleviates the deterioration of the composite's plasticity, improving the strength-plasticity matching performance of the titanium-based composite material. This solves the problem of localized enrichment of the carbonaceous reinforcing phase and its uneven distribution on the titanium matrix surface caused by traditional ball milling methods. In addition, the present invention employs a surface carburizing process, in which carbon atoms diffuse onto the surface of the titanium matrix powder and combine with titanium atoms to form a TiC carburized layer of a certain thickness, which effectively improves the surface hardness of the titanium matrix powder. After the powder is sintered, the surface hardness value and overall hardness distribution uniformity of the titanium matrix composite material are improved.

[0009] The preparation method of the above-mentioned titanium-based composite material with uniform hardness is characterized in that the titanium-based spherical powder in step one is TA1 titanium spherical powder, TC4 or TC21 titanium alloy spherical powder.

[0010] The method for preparing a titanium-based composite material with uniform hardness described above is characterized in that the particle size of the titanium-based spherical powder in step one is 100 μm to 150 μm, and the particle size of the graphite powder is 3 μm to 5 μm. This preferred size facilitates better dispersion of the two raw materials after ball milling.

[0011] The method for preparing a titanium-based composite material with uniform hardness described above is characterized in that the ball milling speed in step one is 200 rpm, the ball milling time is 4 h to 8 h, and the ball-to-material ratio is 3:1.

[0012] The method for preparing a titanium-based composite material with uniform hardness described above is characterized in that, in step two, ethanol is added to the graphite-titanium-based mixed powder and stirred until a concrete-like slurry is formed. This invention, by adding ethanol to the graphite-titanium-based mixed powder and stirring until a concrete-like slurry is formed, ensures the stability of the titanium-based spherical powder and the low-density graphite powder during the surface carburizing process, and avoids the powder being sucked into the pipeline and contaminating the vacuum chamber during the vacuuming process of the surface carburizing treatment.

[0013] The method for preparing a titanium-based composite material with uniform hardness described above is characterized in that the surface carburizing treatment in step two is as follows: first, the temperature is raised to 150℃~200℃ and held for 10min~20min, then the temperature is raised to 600℃~700℃ and held for 1h~3h. The surface carburizing treatment of this invention uses a temperature gradient. First, the temperature is raised to 150℃~200℃ and held for 10min~20min to ensure complete evaporation of the ethanol solution in the slurry. Then, the temperature is raised to 600℃~700℃ and held for 1h~3h to ensure that the surface of the titanium-based spherical powder is completely carburized, rather than completely carburized throughout. This also avoids solid-phase sintering between the titanium-based spherical powders, thereby improving the surface carburizing effect.

[0014] The method for preparing a titanium-based composite material with uniform hardness described above is characterized in that, in step two, after surface carburizing treatment, the surface-carburized titanium-based spherical powder is obtained by sieving. This invention removes surface graphite powder by sieving after surface carburizing treatment, thus eliminating poorly bonded graphite powder and preventing performance degradation of the titanium-based composite material due to localized agglomeration of the reinforcing phase after subsequent sintering.

[0015] The method for preparing a titanium-based composite material with uniform hardness described above is characterized in that, in step three, the heating rate of the spark plasma sintering is 100℃ / min, the temperature is 900℃~1000℃, the time is 10min~20min, and the pressure is 40MPa. These preferred sintering process parameters are beneficial for the densification and forming of surface-carburized titanium-based spherical powders.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. Compared to the traditional ball milling method, which involves coating the titanium and titanium alloy powders with carbonaceous reinforcing phases and then sintering to obtain titanium-based composite materials, where the TiC phase is mostly distributed at grain boundaries and rarely distributed within the grains, this invention combines ball milling with surface carburizing. Through a two-step process, graphite powder is evenly distributed on the surface of the titanium-based spherical powder, and carbon atoms from the graphite powder penetrate into the surface layer of the titanium-based spherical powder. This forms a structure in which the reinforcing TiC phase is distributed at both the grain boundaries and within the grains of the titanium-based composite material, thereby synergistically strengthening the titanium-based composite material. Furthermore, the high-hardness TiC phase acts as a pinning agent for dislocation movement, thus improving both the strength and hardness of the titanium-based composite material.

[0018] 2. Compared to the traditional method of carburizing titanium alloy blocks, which results in a gradient distribution of hardness due to the limited depth of the carburized layer, this invention achieves overall uniformity of surface hardness in titanium-based composite materials by performing spark plasma sintering on surface-carburized titanium-based spherical powder. This improves surface hardness and solves the problem of gradient hardness distribution after carburization. At the same time, the TiC phase in the surface layer of the titanium-based spherical powder, i.e., the carburized layer, effectively hinders grain growth and refines the grains, further strengthening the titanium matrix and improving the strength properties of the titanium-based composite material.

[0019] 3. This invention forms a structure in which the reinforcing TiC phase is distributed at both the grain boundaries and within the grains of the titanium-based composite material through ball milling and surface carburizing processes, effectively alleviating the deterioration of the room temperature plasticity of the titanium-based composite material and achieving optimized matching of strength and plasticity.

[0020] 4. The preparation process of the present invention is simple, highly operable, and has low production cost, which is conducive to large-scale industrial application.

[0021] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the hardness distribution in different regions of the TC4 titanium alloy composite material with uniform hardness prepared in Example 1 of the present invention and the TC4 titanium alloy material prepared in Comparative Example 1.

[0023] Figure 2 Tensile curves of the TC4 titanium alloy composite material with uniform hardness prepared in Example 1 of the present invention and the TC4 titanium alloy material prepared in Comparative Example 1 are shown. Detailed Implementation

[0024] Example 1

[0025] This embodiment includes the following steps:

[0026] Step 1: Preparation of graphite-titanium-based mixed powder: 200g of TC4 titanium alloy spherical powder with a uniform particle size of 150μm and 10g of graphite powder with a size of 3μm to 5μm were ball-milled and mixed. The ball milling speed was 200rpm and the ball milling time was 4h. The ball-to-powder ratio was 3:1, so that the graphite powder continuously coated the surface of the TC4 titanium alloy spherical powder to obtain a uniformly mixed graphite-titanium-based mixed powder.

[0027] Step 2: Surface carburizing of titanium-based spherical powder: Add 15 mL of ethanol solution to the graphite-titanium-based mixed powder obtained in Step 1 and stir until it becomes a concrete-like slurry. Then place it in a vacuum tube furnace for surface carburizing treatment. First, heat the furnace to 200°C and hold for 10 min to allow the ethanol solution in the slurry to evaporate completely. Then heat the furnace to 700°C and hold for 2 h. Cool the furnace to room temperature and remove the graphite powder through a sieve to avoid local agglomeration to obtain surface carburized titanium-based spherical powder.

[0028] Step 3: Sintering and forming: The surface carburized titanium-based spherical powder obtained in Step 2 is subjected to spark plasma sintering. The heating rate of spark plasma sintering is 100℃ / min, the temperature is 1000℃, the time is 10min, and the pressure is 40MPa, to obtain a TC4 titanium alloy composite material with uniform hardness.

[0029] Comparative Example 1

[0030] This comparative example includes the following steps:

[0031] Step 1: Preparation of graphite-titanium-based mixed powder: 200g of TC4 titanium alloy spherical powder with a uniform particle size of 150μm and 10g of graphite powder with a size of 3μm to 5μm were ball-milled and mixed. The ball milling speed was 200rpm and the ball milling time was 4h. The ball-to-powder ratio was 3:1, so that the graphite powder continuously coated the surface of the TC4 titanium alloy spherical powder to obtain a uniformly mixed graphite-titanium-based mixed powder.

[0032] Step 2, Sintering and Shaping: The graphite-titanium based mixed powder obtained in Step 2 is subjected to spark plasma sintering. The heating rate of spark plasma sintering is 100℃ / min, the temperature is 1000℃, the time is 10min, and the pressure is 40MPa to obtain TC4 titanium alloy composite material.

[0033] Figure 1 This is a schematic diagram showing the hardness distribution in different regions of the TC4 titanium alloy composite material with uniform hardness prepared in Example 1 of the present invention and the TC4 titanium alloy material prepared in Comparative Example 1. Figure 1 It can be seen that, compared with the TC4 titanium alloy material prepared by conventional mechanical ball milling and powder mixing in Comparative Example 1, the TC4 titanium alloy composite material after carburizing has a uniform hardness distribution and no obvious hardness gradient.

[0034] Figure 2 The tensile curves of the TC4 titanium alloy composite material with uniform hardness prepared in Example 1 and the TC4 titanium alloy material prepared in Comparative Example 1 are shown below. Figure 2 It can be seen that, compared with the titanium-based composite material prepared by conventional mechanical ball milling and powder mixing in Comparative Example 1, the strength of the titanium-based composite material after carburizing is improved, but the plasticity is slightly reduced.

[0035] Example 2

[0036] This embodiment includes the following steps:

[0037] Step 1: Preparation of graphite-titanium based mixed powder: 200g of TC4 titanium alloy spherical powder with a uniform particle size of 100μm and 10g of graphite powder with a size of 3μm to 5μm were ball-milled and mixed. The ball milling speed was 200rpm and the ball milling time was 6h. The ball-to-powder ratio was 3:1, so that the graphite powder continuously coated the surface of the TC4 titanium alloy spherical powder to obtain a uniformly mixed graphite-titanium based mixed powder.

[0038] Step 2: Surface carburizing of titanium-based spherical powder: Add 15 mL of ethanol solution to the graphite-titanium-based mixed powder obtained in Step 1 and stir until it becomes a concrete-like slurry. Then place it in a vacuum tube furnace for surface carburizing treatment. First, heat the furnace to 200°C and hold for 10 min to allow the ethanol solution in the slurry to evaporate completely. Then heat the furnace to 700°C and hold for 2 h. Cool the furnace to room temperature and remove the graphite powder through a sieve to avoid local agglomeration to obtain surface carburized titanium-based spherical powder.

[0039] Step 3: Sintering and shaping: The surface carburized titanium-based spherical powder obtained in Step 2 is subjected to spark plasma sintering. The heating rate of spark plasma sintering is 100℃ / min, the temperature is 900℃, the time is 10min, and the pressure is 40MPa, to obtain a TC4 titanium alloy composite material with uniform hardness.

[0040] Example 3

[0041] This embodiment includes the following steps:

[0042] Step 1: Preparation of graphite-titanium based mixed powder: 200g of TC4 titanium spherical powder with a uniform particle size of 150μm and 10g of graphite powder with a size of 3μm to 5μm were ball-milled and mixed. The ball milling speed was 200rpm and the ball milling time was 6h. The ball-to-powder ratio was 3:1, so that the graphite powder continuously coated the surface of the TC4 titanium spherical powder to obtain a uniformly mixed graphite-titanium based mixed powder.

[0043] Step 2: Surface carburizing of titanium-based spherical powder: Add 15 mL of ethanol solution to the graphite-titanium-based mixed powder obtained in Step 1 and stir until it becomes a concrete-like slurry. Then place it in a vacuum tube furnace for surface carburizing treatment. First, heat the furnace to 150°C and hold for 20 min to allow the ethanol solution in the slurry to evaporate completely. Then heat the furnace to 600°C and hold for 3 h. Cool the furnace to room temperature and remove the graphite powder through a sieve to avoid local agglomeration to obtain surface carburized titanium-based spherical powder.

[0044] Step 3: Sintering and shaping: The surface carburized titanium-based spherical powder obtained in Step 2 is subjected to spark plasma sintering. The heating rate of spark plasma sintering is 100℃ / min, the temperature is 1000℃, the time is 20min, and the pressure is 40MPa, to obtain a TC4 titanium composite material with uniform hardness.

[0045] Example 4

[0046] This embodiment includes the following steps:

[0047] Step 1: Preparation of graphite-titanium-based mixed powder: 200g of TA1 titanium spherical powder with a uniform particle size of 150μm and 10g of graphite powder with a size of 3μm to 5μm were ball-milled and mixed. The ball milling speed was 200rpm and the ball milling time was 6h. The ball-to-powder ratio was 3:1, so that the graphite powder continuously coated the surface of the TA1 titanium spherical powder to obtain a uniformly mixed graphite-titanium-based mixed powder.

[0048] Step 2: Surface carburizing of titanium-based spherical powder: Add 15 mL of ethanol solution to the graphite-titanium-based mixed powder obtained in Step 1 and stir until it becomes a concrete-like slurry. Then place it in a vacuum tube furnace for surface carburizing treatment. First, heat the furnace to 200°C and hold for 10 min to allow the ethanol solution in the slurry to evaporate completely. Then heat the furnace to 700°C and hold for 2 h. Cool the furnace to room temperature and remove the graphite powder through a sieve to avoid local agglomeration to obtain surface carburized titanium-based spherical powder.

[0049] Step 3: Sintering and shaping: The surface carburized titanium-based spherical powder obtained in Step 2 is subjected to spark plasma sintering. The heating rate of spark plasma sintering is 100℃ / min, the temperature is 1000℃, the time is 20min, and the pressure is 40MPa, to obtain a TA1 titanium composite material with uniform hardness.

[0050] Example 5

[0051] This embodiment includes the following steps:

[0052] Step 1: Preparation of graphite-titanium-based mixed powder: 200g of TC21 titanium alloy spherical powder with a uniform particle size of 150μm and 10g of graphite powder with a size of 3μm to 5μm were ball-milled and mixed. The ball milling speed was 200rpm and the ball milling time was 2h. The ball-to-powder ratio was 3:1, so that the graphite powder continuously coated the surface of the TC21 titanium alloy spherical powder to obtain a uniformly mixed graphite-titanium-based mixed powder.

[0053] Step 2: Surface carburizing of titanium-based spherical powder: Add 15 mL of ethanol solution to the graphite-titanium-based mixed powder obtained in Step 1 and stir until it becomes a concrete-like slurry. Then place it in a vacuum tube furnace for surface carburizing treatment. First, heat the furnace to 200°C and hold for 10 min to allow the ethanol solution in the slurry to evaporate completely. Then heat the furnace to 700°C and hold for 2 h. Cool the furnace to room temperature and remove the graphite powder through a sieve to avoid local agglomeration to obtain surface carburized titanium-based spherical powder.

[0054] Step 3: Sintering and forming: The surface carburized titanium-based spherical powder obtained in Step 2 is subjected to spark plasma sintering. The heating rate of spark plasma sintering is 100℃ / min, the temperature is 1000℃, the time is 10min, and the pressure is 40MPa, to obtain a TC21 titanium alloy composite material with uniform hardness.

[0055] Example 6

[0056] This embodiment includes the following steps:

[0057] Step 1: Preparation of graphite-titanium-based mixed powder: 200g of TA15 titanium alloy spherical powder with a uniform particle size of 150μm and 10g of graphite powder with a size of 3μm to 5μm were ball-milled and mixed. The ball milling speed was 200rpm and the ball milling time was 2h. The ball-to-powder ratio was 3:1, so that the graphite powder continuously coated the surface of the TA15 titanium alloy spherical powder to obtain a uniformly mixed graphite-titanium-based mixed powder.

[0058] Step 2: Surface carburizing of titanium-based spherical powder: Add 15 mL of ethanol solution to the graphite-titanium-based mixed powder obtained in Step 1 and stir until it becomes a concrete-like slurry. Then place it in a vacuum tube furnace for surface carburizing treatment. First, heat the furnace to 200°C and hold for 10 min to allow the ethanol solution in the slurry to evaporate completely. Then heat the furnace to 700°C and hold for 2 h. Cool the furnace to room temperature and remove the graphite powder through a sieve to avoid local agglomeration to obtain surface carburized titanium-based spherical powder.

[0059] Step 3: Sintering and forming: The surface carburized titanium-based spherical powder obtained in Step 2 is subjected to spark plasma sintering. The heating rate of spark plasma sintering is 100℃ / min, the temperature is 1000℃, the time is 10min, and the pressure is 40MPa, to obtain a TA15 titanium alloy composite material with uniform hardness.

[0060] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the inventive essence shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing a titanium-based composite material with uniform hardness, characterized in that, The method includes the following steps: Step 1: Preparation of graphite-titanium-based mixed powder: Titanium-based spherical powder with uniform particle size is ball-milled and mixed with graphite powder, so that the graphite powder continuously coats the surface of the titanium-based spherical powder to obtain a uniformly mixed graphite-titanium-based mixed powder; the titanium-based spherical powder is titanium or titanium alloy powder. Step 2: Surface carburizing of titanium-based spherical powder: Add ethanol solution to the graphite-titanium-based mixed powder obtained in Step 1 and stir to form a slurry. Then place it in a vacuum furnace for surface carburizing treatment while removing the ethanol to obtain surface carburized titanium-based spherical powder. The surface carburizing treatment process is as follows: first, heat to 150℃~200℃ and hold for 10min~20min, then heat to 600℃~700℃ and hold for 1h~3h. Step 3, Sintering and Shaping: The surface-carburized titanium-based spherical powder obtained in Step 2 is subjected to spark plasma sintering to obtain a titanium-based composite material with uniform hardness.

2. The method for preparing a titanium-based composite material with uniform hardness according to claim 1, characterized in that, The titanium-based spherical powder mentioned in step one is TA1 titanium spherical powder, TC4 or TC21 titanium alloy spherical powder.

3. The method for preparing a titanium-based composite material with uniform hardness according to claim 1, characterized in that, The titanium-based spherical powder in step one has a particle size of 100μm~150μm, and the graphite powder has a particle size of 3μm~5μm.

4. The method for preparing a titanium-based composite material with uniform hardness according to claim 1, characterized in that, In step one, the ball milling speed for mixing is 200 rpm, the ball milling time is 4 to 8 hours, and the ball-to-material ratio is 3:

1.

5. The method for preparing a titanium-based composite material with uniform hardness according to claim 1, characterized in that, In step two, ethanol is added to the graphite-titanium-based mixed powder and stirred until a concrete-like slurry is formed.

6. The method for preparing a titanium-based composite material with uniform hardness according to claim 1, characterized in that, In step two, after surface carburizing treatment, the titanium-based spherical powder with surface carburization is obtained by sieving.

7. The method for preparing a titanium-based composite material with uniform hardness according to claim 1, characterized in that, The heating rate of the discharge plasma sintering in step three is 100℃ / min, the temperature is 900℃~1000℃, the time is 10min~20min, and the pressure is 40MPa.

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