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Ti3AlC2/Ti5Si3 compound material and its preparation method

An aluminum titanium carbide and composite material technology, which is applied in the field of in-situ synthesis of a titanium silicide particle reinforced aluminum titanium carbide-based composite material and its preparation field, can solve the problems of unsatisfactory reinforcement effect, low bending strength and the like, and achieve excellent high temperature The effect of oxidation resistance, low cost and simple process

Inactive Publication Date: 2006-06-21
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

The related literature focuses on another kind of Ti 3 AlC 2 A ternary layered ceramic material with similar structure and properties, namely silicon carbide (Ti 3 SiC 2 ) on the in situ preparation of composite materials, such as literature 2: Radhakrishnan et al. reported in situ prepared Ti 3 SiC 2 / SiC composite material, its hardness and fracture toughness are improved; Document 3: In the Journal of Alloys and Compounds (Journal of Alloys and Compounds 350, 303 (2003)), Ho-Duc et al. 3 SiC 2 , and containing 30% by volume of TiC or SiC composites, the results show that the flexural strength of the two composites is higher than that of the unreinforced Ti 3 SiC 2 The matrix is ​​low, indicating that the enhancement effect is not ideal

Method used

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  • Ti3AlC2/Ti5Si3 compound material and its preparation method
  • Ti3AlC2/Ti5Si3 compound material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 73.63 grams of titanium powder, 13.13 grams of aluminum powder, 2.16 grams of silicon powder and 11.08 grams of graphite with a particle size range of 200 to 400 meshes were ball milled in a ball mill tank for 8 hours, and then put into a graphite mold for cold press molding, and the applied pressure was 10 MPa. Put it into a hot-press furnace for hot-pressing sintering. The heating rate is 10°C / min, heated to 1400°C and kept for 2 hours, 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 5 Si 3 two phases, such as figure 1 (a) shown. Quantitative phase analysis indicated that Ti 5 Si 3 The volume content is about 12%. The Vickers hardness of the composite material is 3.49GPa (load is 10N), the compressive strength is 819MPa, and the fracture toughness is 7.87MPa m 1 / 2 .

Embodiment 2

[0019] 73.59 grams of titanium powder, 11.74 grams of aluminum powder, 3.6 grams of silicon powder, and 11.07 grams of graphite in the particle size range of 200 to 400 meshes were ball milled in a ball mill jar for 16 hours, and then put into a graphite mold for cold pressing, and the applied pressure was 15 MPa. Put it into a hot-press furnace for hot-pressing sintering. The heating rate is 20°C / min, heated to 1500°C and kept for 1 hour, 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 Ti 5 Si 3 two phases, such as figure 1 (b) shown. Quantitative phase analysis indicated that Ti 5 Si 3 The volume content is about 20%. The Vickers hardness of the composite material is 3.79GPa, the compressive strength is 919MPa, and the fracture toughness is 7.09MPa m 1 / 2 .

Embodiment 3

[0021] 73.55 grams of titanium powder, 10.36 grams of aluminum powder, 5.03 grams of silicon powder and 11.15 grams of graphite with a particle size ranging from 200 to 400 meshes were ball milled in an alcohol medium, and then put into a graphite mold for cold press molding. The applied pressure was 20 MPa. Sintering by hot isostatic pressing in a hot-press furnace. The heating rate is 50°C / min, heated to 1600°C and kept for 0.5 hours, while the pressure is gradually increased to 20MPa. The whole sintering process is carried out under the protection of argon. The obtained reaction product was analyzed as Ti by X-ray diffraction analysis. 3 AlC 2 and Ti 5 Si 3 two phases, such as figure 1 (c) shown. Quantitative phase analysis indicated that Ti 5 Si 3 The volume content is about 30%. The Vickers hardness of the composite material is 4.37GPa, the compressive strength is 966MPa, and the fracture toughness is 7.96MPa m 1 / 2 .

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Abstract

The invention relates to a method for synthesizing titanium silicide (Ti5Si3) granule in original position to intensify the composite material based on titanium carbide aluminum (Ti3AlC2). Adding a certain amount of silicon, to prepare the Ti3AlC2 / Ti5Si3 composite material of different volume ratio, the volume percentage of the titanium silicide granule is 10-40%. The specific preparing method comprises: employing titanium powder, aluminium powder, silicon powder and graphite powder as raw material, the mole ratio of Tií†Alí†Sií†C is 3: (1.1-x): (1.8~2.0), and x is 0.1-0.5, mixing the raw material powder with physical-mechanical means for 8-24 hours, loading into the graphite mould, the forced pressure is 10-20 Mpa, calcinating in the heating furnace under protective atmosphere, the heating-up speed is 10-50 Deg C / min, the calcining temperature is 1400-1600 Deg C and lasting for 0.5-2 hours, the calcinating pressure is 20-40 Mpa. The titanium carbide aluminium / titanium silicide of high purity and high intensity can be produced under lower temperature and in shorter time by applying this invention.

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 silicide (Ti 5 Si 3 ) 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. Document 1: Wang et al.'s research in ActaMaterialia50, 3141 (2002) shows that 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. Therefore, it has potential wide application prospects in high-tech fields such as aviation, aerospace, nuclear industry, fuel cells and electronic information. [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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/78
Inventor 周延春陈继新
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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