期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 29, 期 13, 页码 2867-2872出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2009.03.027
关键词
SiC; Porosity; Strength; Porosity control; Polysiloxane
资金
- Ministry of Knowledge Economy (MKE), Republic of Korea
Porous SiC ceramics were fabricated by the carbothermal reduction of polysiloxane-derived SiOC containing polymer microbeads followed by sintering. The effect of the SiC powder: polysiloxane-derived SiC (SiC:PDSiC) ratio on the porosity and flexural strength of the porous SiC ceramics were investigated. The porosity generally increased with decreasing SiC:PDSiC ratio when sintered at the same temperature. It was possible to control the porosity of porous SiC ceramics within a range of 32-64% by adjusting the sintering temperature and SiC:PDSiC ratio while keeping the sacrificial template content to 50 vol%. The flexural strengths generally decreased with increasing porosity at the same SiC:PDSiC ratio. However, a SiC:PDSiC ratio of 9:1 and a sintering temperature of 1750 degrees C resulted in excellent strength of 57 MPa at 50% porosity. Judicious selection of the sintering temperature and SiC:PDSiC ratio is an efficient way of controlling the porosity and strength of porous SiC ceramics. (C) 2009 Elsevier Ltd. All rights reserved.
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