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Oxidation of Silicon Carbide‐Reinforced Oxide‐Matrix Composites at 1375° to 1575°C
Author(s) -
Luthra Krishan L.,
Park Hee Dong
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb05150.x
Subject(s) - mullite , silicon carbide , materials science , aluminosilicate , oxide , composite material , ceramic matrix composite , oxygen , carbide , hot pressing , matrix (chemical analysis) , ceramic , catalysis , metallurgy , chemistry , biochemistry , organic chemistry
Oxidation studies were conducted on Al 2 O 3 ‐SiC and mullite‐SiC composites at 1375° to 1575°C in O 2 and in Ar‐1% O 2 . The composites were prepared by hot‐pressing mixtures of Al 2 O 3 or mullite and SiC powders. The reaction products contained alumina, mullite, an aluminosilicate liquid, and gas bubbles. The parabolic rate constants were about 3 orders of magnitude higher than those expected for the oxidation of SiC. Higher rates are caused by higher oxygen permeabilities through the reaction products than through pure silica. Our results suggest that oxygen permeabilities are comparable in the three condensed phases observed in the reaction products.