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Sol—Gel Processing of SiC‐Whisker‐Reinforced Silica‐Based Ceramic Composites
Author(s) -
Lee Burtrand I.,
Park SeungYong
Publication year - 1989
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.1151-2916.1989.tb06096.x
Subject(s) - chromia , mullite , materials science , whiskers , sintering , whisker , ceramic , composite material , chromium , hydroxide , ceramic matrix composite , chemical engineering , metallurgy , engineering
SiC whiskers were added to reinforce a gel‐derived SiO 2 –Al 2 O 3 –Cr 2 O 3 matrix. Alumina and chromia were added to induce reaction sintering of the composites. A maximum of ∼90% of theoretical density was achieved after firing in argon for 2 h at 1400°C. The optimum amounts of alumina, chromia, and SiC were 26.5, 1.6, and 4.1 vol%, respectively. It was shown that the chromium acetate hydroxide, used as a precursor for chromia, acted as a gelling agent and as a sintering additive. The effect of producing gaseous products such as SiO, CO and/or CrO 3 became significant above 1400°C where mullite formation also occurred. However, the measured mechanical properties were remarkable, considering the experimental conditions applied.