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Preparation method of Al2O3 fiber-toughened MAX-phase ceramic matrix composite
The invention relates to a preparation method of an Al2O3 fiber-toughened MAX-phase ceramic matrix composite. The preparation method comprises the following steps: preparing a slurry by deionized water, sodium carboxymethyl cellulose, TiC and TiO2, performing vacuum infiltration combined with pressure infiltration to a porous Al2O3/SiC precast, tiling industrial aluminum powder or aluminum-silicon alloy powder on surface of the precast, and then reacting and sintering in a vacuum furnace to make the powder melted and penetrated into the precast. By using a slurry infiltration method, pores formed between fasciculus of the Al2O3/SiC precast and between matrixes are filled by TiC and TiO2 particles; and then Al or Al-Si alloy powder is then utilized to perform melt infiltration to obtain products such as Ti3AlC2 or Ti3Si(Al)C2 MAX-phase ceramics by reaction under high temperature, so as to prepare the Al2O3 fiber-toughened MAX-phase ceramic matrix composite. Compared with Al2O3 fiber-toughened SiC ceramic matrix composite, the material prepared according to the preparation method has both greatly improved strength and fracture toughness, wherein the bending strength of the material is up to 350-500MPa and the fracture toughness is up to 13-18MPa.m<1/2>.
Preparation method of Al2O3 fiber-toughened MAX-phase ceramic matrix composite
The invention relates to a preparation method of an Al2O3 fiber-toughened MAX-phase ceramic matrix composite. The preparation method comprises the following steps: preparing a slurry by deionized water, sodium carboxymethyl cellulose, TiC and TiO2, performing vacuum infiltration combined with pressure infiltration to a porous Al2O3/SiC precast, tiling industrial aluminum powder or aluminum-silicon alloy powder on surface of the precast, and then reacting and sintering in a vacuum furnace to make the powder melted and penetrated into the precast. By using a slurry infiltration method, pores formed between fasciculus of the Al2O3/SiC precast and between matrixes are filled by TiC and TiO2 particles; and then Al or Al-Si alloy powder is then utilized to perform melt infiltration to obtain products such as Ti3AlC2 or Ti3Si(Al)C2 MAX-phase ceramics by reaction under high temperature, so as to prepare the Al2O3 fiber-toughened MAX-phase ceramic matrix composite. Compared with Al2O3 fiber-toughened SiC ceramic matrix composite, the material prepared according to the preparation method has both greatly improved strength and fracture toughness, wherein the bending strength of the material is up to 350-500MPa and the fracture toughness is up to 13-18MPa.m<1/2>.
Preparation method of Al2O3 fiber-toughened MAX-phase ceramic matrix composite
YIN XIAOWEI (Autor:in) / CHEN LINGQI (Autor:in) / FAN XIAOMENG (Autor:in) / MA XIAOKANG (Autor:in) / ZHANG LITONG (Autor:in) / CHENG LAIFEI (Autor:in)
20.05.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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