Fabrication of Mullite-Alumina-SiC Composites by In-Situ Reaction during Carbothermal Reduction of Inorganic Materials

Journal of Advanced Materials in Engineering

S.S. Ghasemi¹  M. Kalantar¹  P. Seifollahzadeh¹  A. Mashreghi¹ 

[1] Department of Materials Science and Engineering, Faculty of Mining and Materials Engineering,;

关键词: carbothermal reduction;    andalusite;    kaolinite;    alumina;    mullite;    sic;   

DOI  :  

来源: DOAJ

【 摘 要 】

Mullite and alumina are common in high-temperature applications because of their low thermal expansion coefficient and good thermal shock resistance. Evolution of SiC in the matrix and using it as reinforcing phase can improve thermo-mechanical properties of these materials. Also, in-situ formation of the reinforcing phases by using inorganic materials is an economical process. In this work, crystallization of SiC as reinforcing phase in the matrix of mullite-alumina by carbothermal reaction processes of inorganic materials (andalusite and kaolinite) was studied. According to the ratio of C/SiO2 and process conditions, some properties of the composite such as phase transformation, microstructure and physical and mechanical properties were investigated. The results showed that optimal ratio of C/SiO2 and firing temperature of densification to form SiC crystals were 3.5 and 1600°C for andalusite and 5.5 and 1500°C for kaolinite.

【 授权许可】

Unknown