In Situ Reaction Synthesis of Porous Silica-Matrix Ceramics
A novel technique was developed to synthesize porous silica–matrix ceramics from silicon carbide and alumina with an Y2O3 addition, using pine sawdust as a pore former. The porous ceramics were fabricated at temperatures of 1300–1500 oC in air by a reaction–bonding process based on two reactions: (1)SiC+2O2→SiO2+CO2 (Oxidation) and (2)2SiO2+3Al2O3→3Al2O3·2SiO2 (Mullitization). Reaction–bonding behavior, mechanical property and open porosity were investigated as a function of Y2O3 content as well as sintering temperature and holding time. Moreover, phase composition and microstructure of the porous silica–matrix ceramics were studied by X–ray diffraction (XRD) and scanning electron microscopy (SEM).
Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li
S. Q. Ding et al., "In Situ Reaction Synthesis of Porous Silica-Matrix Ceramics", Key Engineering Materials, Vols. 280-283, pp. 1143-1146, 2005