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Reaction synthesis of mullite–silicon carbide–yttria-stabilized zirconia composites

Published online by Cambridge University Press:  31 January 2011

Yung-Jen Lin  and
Lee-Jen Chen
Yung-Jen Lin
Affiliation:
Department of Materials Engineering, Tatung University, Taipei, Taiwan, Republic of China
Lee-Jen Chen
Affiliation:
Department of Materials Engineering, Tatung University, Taipei, Taiwan, Republic of China
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Abstract

SiC/mullite/zirconia composites were fabricated by controlling the oxidation of powder compacts of SiC, alumina, and 3 mol% yttria-stabilized zirconia. The powder compacts were first oxidized in air at 1100 °C for various times to obtain proper amounts of amorphous silica. Subsequent reaction sintering at 1500 °C for 2 h combined the amorphous silica with alumina to form mullite with planned amounts. The incorporation of 3 mol% yttria-stabilized zirconia promoted mullite formation and enhanced the densification of the samples. With ≥10 vol% of 3 mol% yttria-stabilized zirconia in the samples, the temperature of mullite formation was lowered from 1400 to 1300 °C, and mullitization was near completion after sintering at 1500 °C for 2 h. The densification of the samples depended on the contents of SiC and 3 mol% yttria-stabilized zirconia. Samples with 20 vol% SiC and 10–20 vol% 3 mol% yttria-stabilized zirconia could be sintered to reach approximately 97% of theoretical density after sintering at 1500 °C for 2 h.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 10 , October 1999 , pp. 3949 - 3956
Copyright
Copyright © Materials Research Society 1999

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