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Composite material of aluminum titanium carbide / titanium diboride, and preparation method

A technology of titanium diboride and aluminum titanium carbide is applied in the field of in-situ synthesis of a titanium diboride particle reinforced aluminum titanium carbide-based composite material and its preparation field, which can solve the problems of low strength and hardness, and achieve high hardness, The effect of reducing sintering cost and simple process

Inactive Publication Date: 2009-01-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Since pure Ti 3 AlC 2 Low strength and hardness limit its application as a structural material

Method used

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  • Composite material of aluminum titanium carbide / titanium diboride, and preparation method
  • Composite material of aluminum titanium carbide / titanium diboride, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1.11 grams of boron carbide powder with a particle size of 3 microns, 19.37 grams of titanium powder with a particle size of 300 mesh, 3.68 grams of aluminum powder with a particle size of 200 mesh, and 2.44 grams of graphite powder with a particle size of 400 mesh were ball milled in a ball mill for 15 hours, and then filled with graphite It is formed by cold pressing in a mold, and the applied pressure is 5MPa, and then put into a hot pressing furnace for hot pressing and sintering. The heating rate is 10°C / min, heated to 1500°C and kept for 1 hour, while the pressure is gradually increased to 25MPa. The whole sintering process is carried out under the protection of argon. The obtained reaction product was analyzed by X-ray diffraction as Ti 3 AlC 2 and Ti 2 B two-phase, such as figure 1 (a) shown. Quantitative phase analysis by the Rietveld method indicated that TiB 2 The volume content is about 10%, and the measured density is 97% of the theoretical density. ...

Embodiment 2

[0019] 11.05 grams of boron carbide powder with a particle size of 3 microns, 96.6 grams of titanium powder with a particle size of 300 mesh, 16.5 grams of aluminum powder with a particle size of 300 mesh, and 9.6 grams of graphite powder with a particle size of 400 mesh were ball-milled in a ball mill for 20 hours, and then loaded with graphite The mold is punched and cold-pressed, and the applied pressure is 10 MPa, and put into a hot-press furnace for hot-press sintering. The heating rate is 13°C / min, heated to 1500°C and kept for 1 hour, while the pressure is gradually increased to 35MPa. The whole sintering process is carried out under the protection of argon. The obtained reaction product was analyzed by X-ray diffraction as Ti 3 AlC 2 and TiB 2 two phases, such as figure 1 (b) shown. Quantitative phase analysis by the Rietveld method indicated that TiB 2 The volume content is about 19.3%, and the measured density is 99% of the theoretical density.

Embodiment 3

[0021] 11.05 grams of boron carbide powder with a particle size of 3 microns, 64.28 grams of titanium powder with a particle size of 300 mesh, 9.69 grams of aluminum powder with a particle size of 300 mesh, and 4.68 grams of graphite powder with a particle size of 400 mesh were ball milled in a ball mill for 20 hours, and then filled with graphite It is formed by cold pressing in a mould, and the applied pressure is 10MPa, and put into a hot pressing furnace for hot pressing and sintering. The heating rate is 15°C / min, heated to 1550°C and kept for 0.5 hours, while the pressure is gradually increased to 30MPa. The whole sintering process is carried out under the protection of argon. The obtained reaction product was analyzed by X-ray diffraction as Ti 3 AlC 2 and TiB 2 two phases, such as figure 1 (c) shown. Quantitative phase analysis by the Rietveld method indicated that TiB 2 The volume content is about 28.7%, and the measured density is 99% of the theoretical density...

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Abstract

This invention relates to a method for preparing TiB2 particles reinforced Ti3AlC2-based composite material by in situ synthesis. The composite material is composed of Ti3AlC2 matrix 70-90 vol. %, and TiB2 particles reinforcing phase 10-30 vol. %. The composite material is prepared from B4C powder, Ti powder, Al powder and graphite powder at a mol. ratio of 2:(40.4-13.4):(13.6-3.6):(20.4-3.9). The method comprises: mechanically mixing the above raw materials for 10-18 h, loading into a graphite mold, molding by cold-pressing under 5-10 MPa, and sintering in a hot pressing furnace in inert atmosphere at 1400-1600 deg.C (heating rate = 10-30 deg.C / min) and 20-40 MPa for 0.5-2 h. The method can prepare high-strength compact Ti3AlC2 / TiB2 composite material at relative low temperature.

Description

technical field [0001] The invention relates to a ceramic matrix composite material and a preparation method thereof, specifically in-situ synthesis of a titanium diboride (TiB 2 ) particle reinforced aluminum titanium carbide (Ti 3 AlC 2 ) matrix composite material and its preparation method. Background technique [0002] Ti 3 AlC 2 It is a new type of ternary layered ceramic material. It combines many advantages of ceramics and metals, and has the characteristics of low density, high modulus, thermal shock resistance and excellent high temperature oxidation resistance, so it is widely used in high-tech fields such as aviation, aerospace, nuclear industry, fuel cells and electronic information. It has potential wide application prospects. [0003] Since pure Ti 3 AlC 2 The low strength and hardness limit its application as a structural material. Introducing hard ceramic particles is one of the effective methods to improve the strength of ternary layered ceramics. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C04B35/515C04B35/56C04B35/622
Inventor 李超李美栓周延春
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI