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TaC-SiC ceramic composite material synthesized by hot pressing at in-situ reaction and synthetic method thereof

A ceramic composite material and in-situ reaction technology, which is applied in the field of in-situ reaction hot-pressing synthesis of TaC-SiC ceramic composite materials and its synthesis field, can solve the problems of unsatisfactory anti-oxidation performance of TaC and easy formation of loose surface oxide layer, etc. Achieve excellent high temperature oxidation resistance, improve high temperature oxidation resistance, and simple process

Inactive Publication Date: 2009-04-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The object of the present invention is to provide an in-situ reactive hot-pressed TaC-SiC ceramic composite material and its synthesis method with easy control of process conditions and low cost and its synthesis method, so as to solve the unsatisfactory oxidation resistance of TaC, which is easy to form in an oxidizing atmosphere. Problems such as loose surface oxide layer

Method used

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  • TaC-SiC ceramic composite material synthesized by hot pressing at in-situ reaction and synthetic method thereof
  • TaC-SiC ceramic composite material synthesized by hot pressing at in-situ reaction and synthetic method thereof
  • TaC-SiC ceramic composite material synthesized by hot pressing at in-situ reaction and synthetic method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1 (TaC-5vol.% SiC, TAS5)

[0021] 90.3g of tantalum powder, 0.80g of silicon powder and 5.71g of graphite powder with a particle size ranging from 200 to 600 mesh were ball-milled in a resin tank for 40 hours, passed through a 200-mesh sieve, and then put into a graphite mold for cold press molding. The applied pressure was 10MPa, put it into a hot-press furnace for hot-press sintering. The heating rate is 15°C / min, heated to 1950°C and kept for 2 hours, and the applied pressure is 30MPa. The entire sintering process is carried out under the protection of argon, and the obtained reaction product is analyzed as TaC by X-ray diffraction, and no diffraction peak appears due to the small content of SiC. The density measured by the Archimedes method is 12.58g / cm 3 , which is 90.4% of the theoretical density. The Vickers hardness is 6.3GPa, the bending strength is 309MPa, and the fracture toughness is 2.9MPa m 1 / 2 , the modulus of elasticity is 353GPa.

Embodiment 2

[0022] Example 2 (TaC-10vol.% SiC, TAS10)

[0023] 91.67g of tantalum powder, 1.71g of silicon powder and 6.12g of graphite powder with a particle size ranging from 200 to 600 mesh were ball-milled in a resin tank for 10 hours, passed through a 200-mesh sieve, and then put into a graphite mold for cold press molding. The applied pressure was 20MPa, put it into a hot-press furnace for hot-press sintering. The heating rate is 15°C / min, heated to 2050°C and kept for 1 hour, and the applied pressure is 40MPa. The whole sintering process is carried out under the protection of argon, and the obtained reaction products are analyzed as TaC and β-SiC by X-ray diffraction. The density measured by the Archimedes method is 12.69g / cm 3 , 95.0% of the theoretical density. The Vickers hardness is 8.9GPa, the bending strength is 341MPa, and the fracture toughness is 2.6MPa m 1 / 2 , the modulus of elasticity is 410GPa.

Embodiment 3

[0024] Embodiment 3 (TaC-20vol.% SiC, TAS20)

[0025] 90.55g of tantalum powder, 3.75g of silicon powder and 6.85g of graphite powder with a particle size ranging from 200 to 600 mesh were ball-milled in a resin tank for 20 hours, passed through a 200-mesh sieve, and then put into a graphite mold for cold-press molding. The applied pressure was 5MPa, put it into a hot-press furnace for hot-press sintering. The heating rate is 10°C / min, heated to 1950°C and kept for 1 hour, and the applied pressure is 40MPa. The whole sintering process is carried out under the protection of argon, and the obtained reaction products are analyzed as TaC and β-SiC by X-ray diffraction. The density measured by the Archimedes method is 11.70g / cm 3 , 95.7% of the theoretical density. The Vickers hardness is 8.4GPa, the bending strength is 309MPa, and the fracture toughness is 3.9MPa m 1 / 2 , the modulus of elasticity is 398GPa.

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Abstract

The invention relates to a ceramic matrix composite material and a synthetic method thereof, which are concretely an in-situ reactive synthesized TaC-SiC ceramic composite material by hot pressing and a synthetic method thereof. The method aims at solving the problems that the oxidation resistance of TaC is not ideal and loose surface oxide layers are easy to form in an oxidizing atmosphere, and the like. Two composition phases of TaC and SiC are in-situ formed and the percentage content of SiC is 0 to 50vol. percent. The concrete synthetic method is as follows: tantalum powders, silicon powders and graphite powders are used as materials which are ball milled for 10 to 40 hours under dry condition in a resin tank, after sieving the materials are put in a graphite die for cold molding (5 to 20 MPa), and then the materials are sintered in vacuum or a hot pressing furnace introduced with argon, with the sintering temperature of 1950 to 2150 DEG C, heat preserving sintering time of 1 to 2 hours and sintering pressure of 30 to 40 MPa. The synthetic method can synthesize the TaC-SiC ceramic composite materials by in-situ reaction, the prepared TaC-SiC ceramic composite materials are mainly used for structural components of ablation resistance under high temperature and anti-oxidation and the materials are applied to the aerospace field.

Description

technical field [0001] The invention relates to a ceramic matrix composite material and a synthesis method, in particular to a TaC-SiC ceramic composite material synthesized by in-situ reaction hot pressing and a synthesis method thereof. Background technique [0002] The transition metal carbide TaC has a NaCl-type crystal structure, and it has a high elastic modulus (560GPa), high hardness (15GPa) and a very high melting point (3985°C) due to the existence of covalent bonds. Utilizing its high melting point, TaC can be used as a high-temperature anti-ablation material, for example, it is used as a throat lining material for nozzles of aviation and aerospace engines. Lockheed Martin (USA) has developed a TaC ceramic throat liner (95% dense) that is almost non-ablative and purely molded. Compared with traditional carbon-carbon materials, the production cycle is greatly shortened (Aviation Weapons, 2(2004) 48). However, it cannot be ignored that the oxidation resistance of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/565C04B35/626
Inventor 周延春胡春峰何灵峰包亦望
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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