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Porous silicon nitride-silicon carbide composite ceramic material and preparation method thereof
The invention relates to a porous silicon nitride-silicon carbide composite ceramic material and a preparation method thereof. According to the technical scheme, raw materials comprising, by weight, 25%-75% of silica powder, 12%-69% of silicon carbide powder, 3%-8% of sintering aid and 3%-5% of binding agents are evenly mixed, Fs60 and composite foaming agents are added to the mixture and evenly stirred, and then ceramic foam slurry is prepared, wherein FS60 accounts for 0.1%-2% of the weight of the raw materials, and the composite foaming agents account for 5%-30% of the weight of the raw materials; forming and drying are conducted, and then biscuits are prepared; temperature is raised to 1320-1380 DEG C under a nitrogen atmosphere at the speed of 1-15 DEG C per minute, and the temperature is kept for 0.8-1.2 h; finally, the temperature is raised to 1450-1600 DEG C at the speed of 1-15 DEG C per minute, the temperature is kept for 3-8 h, and then the porous silicon nitride-silicon carbide composite ceramic material is prepared. The granularity of the silica powder is 0.1-150 microns. The granularity of the silicon carbide powder is 0.1-150 microns. According to the porous silicon nitride-silicon carbide composite ceramic material and the preparation method thereof, the technology is simple, and the cost is low. The prepared porous silicon nitride-silicon carbide composite ceramic material has the advantages of being of a hierarchical pore structure and being high in porosity, excellent in high temperature resistance, high in strength, good in thermal shock resistance and excellent in creep resistance.
Porous silicon nitride-silicon carbide composite ceramic material and preparation method thereof
The invention relates to a porous silicon nitride-silicon carbide composite ceramic material and a preparation method thereof. According to the technical scheme, raw materials comprising, by weight, 25%-75% of silica powder, 12%-69% of silicon carbide powder, 3%-8% of sintering aid and 3%-5% of binding agents are evenly mixed, Fs60 and composite foaming agents are added to the mixture and evenly stirred, and then ceramic foam slurry is prepared, wherein FS60 accounts for 0.1%-2% of the weight of the raw materials, and the composite foaming agents account for 5%-30% of the weight of the raw materials; forming and drying are conducted, and then biscuits are prepared; temperature is raised to 1320-1380 DEG C under a nitrogen atmosphere at the speed of 1-15 DEG C per minute, and the temperature is kept for 0.8-1.2 h; finally, the temperature is raised to 1450-1600 DEG C at the speed of 1-15 DEG C per minute, the temperature is kept for 3-8 h, and then the porous silicon nitride-silicon carbide composite ceramic material is prepared. The granularity of the silica powder is 0.1-150 microns. The granularity of the silicon carbide powder is 0.1-150 microns. According to the porous silicon nitride-silicon carbide composite ceramic material and the preparation method thereof, the technology is simple, and the cost is low. The prepared porous silicon nitride-silicon carbide composite ceramic material has the advantages of being of a hierarchical pore structure and being high in porosity, excellent in high temperature resistance, high in strength, good in thermal shock resistance and excellent in creep resistance.
Porous silicon nitride-silicon carbide composite ceramic material and preparation method thereof
LI JUN (Autor:in) / DENG CHENGJI (Autor:in) / CHEN SHAOYI (Autor:in) / ZHU QINGYOU (Autor:in) / YUAN WENJIE (Autor:in) / ZHU HONGXI (Autor:in)
23.09.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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