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TiC particle reinforced Ti-Mo-Hf composite material and preparation method

A technology of ti-mo-hf and composite materials, which is applied in the field of particle-reinforced titanium-based composite materials and their preparation, TiC particle-reinforced Ti-Mo-Hf composite materials and their preparation fields, and can solve the problem of high preparation cost and high melting point of Mo and Hf. , poor interface performance, etc., to achieve the effects of good biocompatibility, guaranteed holding time, and moderate elastic modulus

Inactive Publication Date: 2014-01-22
CENT SOUTH UNIV
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Ti powder, Mo powder, Hf powder and other element powders and TiC particles are fully mixed and then pressed and sintered, but the melting point of Mo and Hf is high, and sintering is very difficult; if Ti-Mo-Hf pre-alloyed powder and TiC particles are fully mixed and then pressed Sintering, on the one hand, the preparation cost of Ti-Mo-Hf pre-alloyed powder is high, on the other hand, because TiC particles are added by external method, the surface of TiC particles is easily polluted, resulting in poor interface performance and affecting the composite material. Comprehensive performance
[0006] Chinese patent 200910311943 "A particle-reinforced titanium-based composite material and its preparation method" aims to improve the mechanical properties of titanium alloys. Using its preparation method, TiC particle-reinforced titanium-based composite materials can be obtained, but due to the limitations of its preparation process, As a result, the obtained TiC particle size is relatively large, which is unfavorable to the wear resistance of particle-reinforced titanium matrix composites.
Therefore, directly adopting the method disclosed in Chinese patent 200910311943 to prepare biomedical TiC particle reinforced Ti-7Mo-7Hf composite materials cannot overcome the defect of poor wear resistance of Ti-7Mo-7Hf
[0007] The above analysis shows that the existing process methods have unfavorable factors for the preparation of TiC particle reinforced Ti-7Mo-7Hf matrix composites

Method used

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  • TiC particle reinforced Ti-Mo-Hf composite material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Prepare 10Kg of TiC reinforced Ti-Mo-Hf composite material, wherein TiC particles account for 4.5% of the volume of Ti-Mo-Hf; use XRD to detect its composition, such as figure 1 As shown, the particle size of TiC particles can be seen to be 3-5 μm by scanning electron microscope observation, such as figure 2 shown;

[0033]Weigh 0.71Kg of Mo2C powder with a particle size of 8 microns, 0.71Kg of HfC powder with a particle size of 8 microns, and 8.58Kg of hydrogenated dehydrogenated titanium powder with a particle size of -100 mesh, mix the powders well, and perform cold isostatic pressing of the mixed powders , the molding pressure is 150MPa; the compact body is first heated to 600°C at a rate of 90°C / h for vacuum sintering for 2 hours, then heated to 1200°C at a rate of 190°C / h for vacuum sintering for 1 hour, and then cooled with the furnace. Obtain TiC particle reinforced Ti-Mo-Hf composite material; during vacuum sintering, control the vacuum degree in the furnace ...

Embodiment 2

[0035] Prepare 10Kg of TiC reinforced Ti-Mo-Hf composite material, wherein TiC particles account for 3% of the total volume of the composite material;

[0036] Weigh 0.5Kg of Mo2C powder with a particle size of 9 microns, 0.5Kg of HfC powder with a particle size of 9 microns, and 9Kg of hydrogenated dehydrogenated titanium powder with a particle size of -100 mesh, fully mix the powders, and carry out cold isostatic pressing of the mixed powders. ;Heat up the pressed green body at a speed of 100°C / h to 650°C for 3 hours in vacuum sintering, then heat up to 1300°C at a speed of 200°C / h for 1.5 hours in vacuum sintering, and cool with the furnace to obtain TiC particle reinforcement Ti-Mo-Hf composite material. During vacuum sintering, control the vacuum degree in the furnace to 5.0×10 -3 Pa. After the obtained composite material was forged, its mechanical properties and wear resistance were tested. The specific test values ​​are shown in Table 1. During forging, the forging te...

Embodiment 3

[0038] Prepare 10Kg of TiC reinforced Ti-Mo-Hf composite material, wherein TiC particles account for 6% of the total volume of the composite material;

[0039] Weigh 0.9Kg of Mo2C powder with a particle size of 10 microns, 0.9Kg of HfC powder with a particle size of 10 microns, and 8.2Kg of hydrogenated dehydrogenated titanium powder with a particle size of -100 mesh, mix the powders well, and perform cold isostatic pressing of the mixed powders ,; the pressed green body was first heated to 800°C at a rate of 110°C / h for 4 hours of vacuum sintering, and then heated to 1400°C at a rate of 210°C / h for vacuum sintering for 2 hours, and then cooled with the furnace to obtain TiC particles Reinforced Ti-Mo-Hf composites. During vacuum sintering, control the vacuum degree in the furnace to 1.0×10 -2 Pa. After the obtained composite material was forged, its mechanical properties and wear resistance were tested. The specific test values ​​are shown in Table 1. During forging, the fo...

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Abstract

The invention relates to a TiC particle reinforced Ti-Mo-Hf composite material and a preparation method, belonging to the technical field of preparation of titanium-based composite materials. The composite material consists of TiC particles and Ti-Mo-Hf matrix alloy, wherein the TiC particles account for 3-6 percent of the volume of the matrix alloy; the granularity of the TiC particles is 3-5 mu m. The preparation method comprises the following steps: mixing Mo2C powder, HfC powder and hydrogenation-dehydrogenization titanium powder according to the designed proportion of the composition of the composite material; mechanically and uniformly dispersing; performing compression molding; heating to 600-800 DEG C at the speed of 90-110 DEG C / h and performing vacuum sintering for 2-4 hours; then heating to 1200-1400 DEG C at the speed of 190-210 DEG C / h and performing vacuum sintering for 1-2 hours; cooling with the furnace to obtain the TiC particle reinforced Ti-Mo-Hf composite material. The preparation process has the advantages of short flow, less equipment investment and low manufacturing cost; the prepared composite material has the advantages of superior wear resistance performance, reasonable elastic modulus and superior formability and is suitable for industrial application.

Description

technical field [0001] The invention relates to a particle-reinforced titanium-based composite material and a preparation method thereof, in particular to a TiC particle-reinforced Ti-Mo-Hf composite material and a preparation method thereof, belonging to the technical field of titanium-based composite material preparation. Background technique [0002] Due to its high strength, toughness and good process formability, titanium alloys are widely used in medical materials such as artificial bones, artificial joints, and artificial spines, and have a wide range of clinical needs. U.S. Patent No. 5954724 "Titanium Molybdenum Hafnium Alloys For Medical Implants And Devices" developed Ti-7Mo-7Hf biomedical titanium alloys for implants such as artificial bones, artificial joints, and artificial spines, but experiments have shown that although Ti-7Mo-7Hf has The elastic modulus is similar to that of artificial bone, and the biocompatibility is good, but its wear resistance is poor, ...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/05C22C32/00
Inventor 刘延斌刘咏赵中伟
Owner CENT SOUTH UNIV
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