Kayal, Nijhuma and Dey, Atanu and Chakrabarti, Omprakash (2012) Incorporation of mullite as a bond phase into porous SiC by an infiltration technique. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 535. pp. 222-227. ISSN 0921-5093

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Abstract

Porous SIC bodies were fabricated from alpha-SIC powder and petroleum coke powder as the pore former were infiltrated with a liquid precursor of mullite which on subsequent heat treatment at 1300 degrees C produced a mullite bonded porous SiC ceramics. Process parameters which control the rate of infiltration were studied. Results showed that infiltration rate could be estimated by using weight gain measurement. Sintering infiltrated bodies at a low temperature of 1300 degrees C yielded specimens in which silicon carbide, mullite and cristobalite were detected. Depending on the porosity of the starting SiC body, the porosity of the final ceramic could be varied in the range of 36-49 vol.% with a variation of flexural strength from 19 to 33 MPa. The average pore diameter (similar to 8.1 mu m) was found to be almost independent of porosity. (C) 2012 Elsevier B.V. All rights reserved.

Item Type:	Article
Uncontrolled Keywords:	SiC Ceramics; Infiltration; Mullite precursor sol; Porous materials; Mechanical properties
Subjects:	Engineering Materials
Divisions:	Non-Oxide Ceramics & Composites
Depositing User:	Bidhan Chaudhuri
Date Deposited:	01 Jun 2012 06:22
Last Modified:	01 Jun 2012 06:22
URI:	http://cgcri.csircentral.net/id/eprint/1451

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