In Situ Reaction Synthesis of Porous Silica-Matrix Ceramics

Shu Qiang Ding; Dong Liang Jiang; Su Min Zhu

doi:10.4028/www.scientific.net/KEM.280-283.1143

Paper Titles

Wear of the Al₂O₃-Based Multi-Ceramic Coatings Produced by SHS Flame Spraying
p.1123

Influence of Loading Conditions on Cyclic Compressive Fatigue Behavior of an Al₂O₃ Matrix Composite
p.1127

Manufacture and Properties of AlON-TiN Particulate Composites
p.1133

Study of the AlON-VN Composite Ceramic
p.1139

In Situ Reaction Synthesis of Porous Silica-Matrix Ceramics
p.1143

Polycrystalline Silicon Thin Films on SiC Substrates for Solar Cells
p.1147

Fabrication of Silica Colloidal Crystal Multilayer with Controlled Thicknesses by Vertical Deposition
p.1149

Preparation and Formation Mechanisms of Monodispersed Mesoporous SiO₂ Microspheres by the PICA Method
p.1153

Mullite Composite Phase Nanocrystalline from High-Silica Kaolin under Normal Pressure and Temperature: An Experimental Study
p.1157

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In Situ Reaction Synthesis of Porous Silica-Matrix Ceramics

Abstract:

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).