Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 464, Issue 1-2, Pages 129-134Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2007.03.076
Keywords
porous ceramics; silicon carbide; microstructure; strength; carbothermal reduction
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Funding
- Korea Institute of Industrial Technology(KITECH) [PM005-7-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Porous silicon carbide (SiC) ceramics were prepared from a carbon-filled polysiloxane by carbothermal reduction and subsequent sintering process. Their microstructure, pore size distribution, compressive strength, and flexural strength were evaluated as a function of sintering temperature. The grain morphology was transformed from small, equiaxed grains to large, platelet grains with increasing sintering temperature. The porosity decreased with increasing sintering temperature from 55% for the 1800 degrees C-sintered specimen to 40% for the 1950 degrees C-sintered specimen, while the pore size distribution ranged from 0.003 to 30 mu m. The volume fractions of both submicron- and micron-size pores decreased significantly with increasing sintering temperature. Both compressive and flexural strengths were increased with increasing sintering temperature, due to both the decreased porosity by densification and the strut strengthening by necking at higher temperatures. (c) 2007 Elsevier B.V. All rights reserved.
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