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Aluminum oxide granule reinforced aluminum titanium carbide base composite material and its preparation method

A technology of aluminum oxide particles and aluminum titanium carbide, applied in the field of ceramic matrix composite materials and preparation, can solve the problems of complex process, generation of titanium carbide impurities, affecting the high temperature oxidation resistance of materials, etc., and achieves simple process, enhanced enhancement effect, and denser The effect of easy process

Inactive Publication Date: 2006-05-10
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

On the other hand, the above Ti 3 SiC 2 / Al 2 o 3 Composite materials are prepared by first synthesizing silicon-titanium carbide (Ti 3 SiC 2 ) powder, and then mixed with alumina for sintering, the process is more complicated, and titanium carbide impurities will inevitably be produced in the subsequent sintering process, which will affect the high temperature oxidation resistance of the material

Method used

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  • Aluminum oxide granule reinforced aluminum titanium carbide base composite material and its preparation method
  • Aluminum oxide granule reinforced aluminum titanium carbide base composite material and its preparation method
  • Aluminum oxide granule reinforced aluminum titanium carbide base composite material and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 140.5 g of titanium powder, 28.01 g of aluminum powder, 21.28 g of graphite, and 9.48 g of alumina powder (5vol.%, particle diameter of 2-5 microns) in the particle size range of 200-400 mesh were ball milled in an alcohol medium for 8 hours, and then loaded It is cold-pressed into a graphite mold, and the applied pressure is 10MPa, and then it is put into a hot-pressing furnace for hot-pressing and sintering. The heating rate is 10°C / min, and the temperature is heated to 1500°C for 1 hour while the pressure is gradually increased to 25MPa. The entire sintering process is carried out under the protection of argon, and the obtained reaction product is analyzed as Ti by X-ray diffraction 3 AlC 2 And Al 2 O 3 . The density measured by Archimedes method is 4.18g / cm 3 , Which is 99.2% of the theoretical density. Ti 3 AlC 2 / 5vol.%Al 2 O 3 The Vickers hardness of the composite material is 3.93GPa; the compressive strength is 781MPa; the bending strength is 386MPa, and the fractur...

Embodiment 2

[0018] 135.4 g of titanium powder, 23.52 g of aluminum powder, 22.08 g of graphite and 19 g of alumina powder (10 vol.%, particle diameter of 5-10 microns) in the particle size range of 200-400 mesh were ball milled in an alcohol medium for 16 hours, and then loaded It is cold-pressed into a graphite mold, and the applied pressure is 15MPa, and then it is put into a hot-pressing furnace for hot-pressing and sintering. The heating rate is 20°C / min, and the temperature is heated to 1550°C for 1 hour while the pressure is gradually increased to 30MPa. The entire sintering process is carried out under the protection of argon, and the obtained reaction product is analyzed as Ti by X-ray diffraction 3 AlC 2 And Al 2 O 3 . The density measured by Archimedes method is 4.17g / cm 3 , Is 99.5% of theoretical density. Ti 3 AlC 2 / 10vol.%Al 2 O 3 The Vickers hardness of the composite material is 4.46GPa; the compressive strength is 879MPa; the bending strength is 423MPa, and the fracture toughn...

Embodiment 3

[0020] 119.24g of titanium powder, 24.48g of aluminum powder, 19.86g of graphite and 38.22g of alumina powder (20vol.%, particle diameter of 0.1-2 microns) with a particle size ranging from 200 to 400 mesh were ball milled in an alcohol medium for 24 hours, and then loaded It is cold pressed into a graphite mold, and the applied pressure is 20 MPa, and it is put into a hot pressing furnace for hot isostatic pressing and sintering. The heating rate is 50°C / min, and the temperature is heated to 1600°C for 1 hour while the pressure is gradually increased to 40MPa. The entire sintering process is carried out under the protection of argon, and the obtained reaction product is analyzed as Ti by X-ray diffraction 3 AlC2 Alone 2 O 3 . The density measured by the Aqui Mid method is 4.15g / cm 3 It is 99.6% of theoretical density. Ti 3 ALC 2 / 20vol.% 2 O 3 The Vickers hardness of the composite is 5.47 GPa; the compression strength is 1138 MPa; the anti-bending strength is 500 MPa, the fract...

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Abstract

The invention relates to a method for preparation of Ti2Al2 / Al2O3 composite by an in-situ hot pressing / solid- liquid phase reaction. The pottery can be prepared by using Al2O3 particles strengthening Ti3AlC2 ternary layer, alumina particle strengthening phase being 5-30% by volume ratio; and the specific method for preparation is as following: using titanium powder, aluminum powder, graphite powder, and alumina powder as the raw material with the molar ration of Ti: Al: C being 3: (0.9-1.1): (1.8-2.0), adding the alumina powder by predetermined volume ratio; mixing the material powders for 8-24 hours by physics machine means, adding into graphite die for cold press with pressure of 10-20MPa, and sintering in a hot-pressing stove in a protective atmosphere, with the heating-up speed of 5-50Deg. C / min, sintering temperature of 1400-1600Deg. C, sintering time of 0.5-2 hours, and sintering pressure of 20-40MPa. In the invention, aluminum-titanium carbide composite reinforced by alumina particle with high purity, high strength and thermostability can be prepared in lower temperature, shorter time.

Description

Technical field [0001] The invention relates to a ceramic matrix composite material and a preparation method, in particular to an in-situ hot pressing / solid-liquid reaction preparation of alumina (Al 2 O 3 )Particle-reinforced aluminum titanium carbide (Ti 3 AlC 2 )-Based composite material and its preparation method. Background technique [0002] Ti 3 AlC 2 It is a new type of ternary layered ceramic material. Literature 1: Research in Acta Materialia50, 3141 (2002) shows that it combines many advantages of ceramics and metals, with high modulus, low hardness, high electrical and thermal conductivity, and easy processing. with broadly application foreground. But as a structural material, its strength and hardness are low, which limits its wide application. The introduction of hard ceramic particles is one of the effective ways to improve the strength of ternary layered ceramics. There is no Ti 3 AlC 2 Strengthen reports. Existing work only focuses on the other kind of Ti 3 AlC 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/64
Inventor 周延春陈继新
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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