Oxidation bonding of porous silicon carbide ceramics with synergistic performance

• Published in: Journal of the European Ceramic Society Vol. 24; no. 2; pp. 331 - 334
• Main Authors: She, J.H, Ohji, T, Kanzaki, S
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 2004; Elsevier
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Mechanical properties; Miscellaneous; Oxidation bonding; Porosity; Porous materials; SiC; Technical ceramics; Mechanical properties; Porosity; SiC; Oxidation bonding; Scanning electron microscopy; Silicon Carbides; Technical ceramics; Oxidation; Manufacturing; Experimental study; Microstructure; Bonding; Porous material; Synergism; Non oxide ceramics
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/S0955-2219(03)00225-5

Porous silicon carbide (SiC) ceramics were fabricated by an oxidation-bonding process, in which the powder compacts are heated in air so that SiC particles are bonded to each other by oxidation-derived SiO 2 glass. It has been shown that a high porosity can be obtained by adding a large amount of graphite into the SiC powder compacts and that the pore diameter can be controlled by the size of graphite particles and/or SiC powders. When a 0.3-μm SiC powder was used, a high strength up to 133 MPa was achieved at a porosity of 31.5%. Moreover, oxidation-bonded SiC (OBSC) ceramics were observed to exhibit an excellent resistance to oxidation and thermal shock.