In situ reaction heat synthesized TaC-TaSi2 ceramic composite material and preparation thereof

A technology of ceramic composite material and in-situ reaction, which is applied in the field of in-situ reaction hot-press synthesis of TaC-TaSi2 ceramic composite material and its preparation, achieving the effects of low cost, simple process flow and simple process

Inactive Publication Date: 2008-12-24
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, there is no report on adding TaSi 2 The way to improve the sintering performance of TaC; on the other hand, TaC has a high elastic modulus (560GPa) and high hardness (15GPa), which can be used to strengthen TaSi 2 Feasible

Method used

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  • In situ reaction heat synthesized TaC-TaSi2 ceramic composite material and preparation thereof
  • In situ reaction heat synthesized TaC-TaSi2 ceramic composite material and preparation thereof
  • In situ reaction heat synthesized TaC-TaSi2 ceramic composite material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 (TaC-5vol.%TaSi 2 , TTS5)

[0021] 115.99g of tantalum powder, 0.98g of silicon powder and 7.49g of graphite powder with a particle size ranging from 200 to 400 mesh were ball-milled in a resin tank for 48 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 1700°C and kept for 2 hours, and the applied pressure is 30MPa. The whole sintering process is carried out under the protection of argon, and the obtained reaction product is analyzed as TaC by X-ray diffraction, because TaSi 2 The content is less and no diffraction peaks appear. The density measured by the Archimedes method is 12.97g / cm 3 , which is 91.3% of the theoretical density. The Vickers hardness is 7.7GPa, the bending strength is 338MPa, and the fracture toughness is 3.3MPa m 1 / 2 , the modulus of elasticity is 408GPa.

Embodiment 2

[0022] Example 2 (TaC-10vol.%TaSi 2 , TTS10)

[0023] 113.12g of tantalum powder, 1.89g of silicon powder, and 7.07g of graphite powder with a particle size ranging from 200 to 400 mesh were ball milled in a resin tank for 12 hours, passed through a 200 mesh sieve, and then put into a graphite mold for cold pressing. 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 1700°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 product is analyzed as TaC by X-ray diffraction, because TaSi 2 The content is less and no diffraction peaks appear. The density measured by the Archimedes method is 13.75g / cm 3 , 98.6% of the theoretical density. The Vickers hardness is 11.4GPa, the bending strength is 376MPa, and the fracture toughness is 3.3MPa m 1 / 2 , the modulus of elasticity is 496GPa.

Embodiment 3

[0024] Embodiment 3 (TaC-20vol.%TaSi 2 , TTS20)

[0025] 107.31g of tantalum powder, 3.78g of silicon powder and 6.3g of graphite powder with a particle size ranging from 200 to 400 mesh were ball-milled in a resin tank for 24 hours, passed through a 200-mesh sieve, and then cold-pressed into a graphite mold for 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 1700°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 by X-ray diffraction as TaC and TaSi 2 . The density measured by the Archimedes method is 13.23g / cm 3 , 98.7% of the theoretical density. The Vickers hardness is 12.2GPa, the bending strength is 315MPa, and the fracture toughness is 3.6MPa m 1 / 2 , the modulus of elasticity is 465GPa.

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Abstract

The invention relates to a ceramic matrix composite material and a method for preparing the same, in particular to a TaC-TaSi2 ceramic composite material synthesized by hot pressing reaction in situ and a method for preparing the same. The two components TaC and TaSi2 are reacted in situ with a volume percentage of 0<Tasi2<100%. The preparation method comprises firstly milling the raw materials of tantalum powder, silicon powder and graphite powder for 12-48 hours in a resin tank under a dry condition, cold press forming(5-20MPa) in a graphite mould after sieving, sintering the moulded product in a vacuum or argon atmosphere hot pressing furnace with a heating rate of 10-15 DEG C / min, a sintering temperature of 1600-1700 DEG C, an insulation sintering time of 1-2 hours and a sintering pressure of 30-40MPa. The TaC-TaSi2 ceramic composite material with high density and good mechanical property can be rapidly prepared at a lower temperature using the preparation method of the invention.

Description

technical field [0001] The invention relates to a ceramic matrix composite material and a preparation method thereof, in particular to an in-situ reaction hot pressing synthesis of TaC-TaSi 2 Ceramic composite material and method for its preparation. 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 sintering p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/645C04B35/56C04B35/58
Inventor 周延春胡春峰包亦望
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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