ALUMINA BASE COATINGS FOR PROTECTION OF SIC CERAMICS

被引:65
作者
FEDERER, JI
机构
[1] ORNL, Oak Ridge, 37831, TN
关键词
D O I
10.1007/BF02834067
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Several alumina base materials containing about 50 to 90 wt% A12O3 (equivalent oxide content) have been investigated as coatings on silicon carbide (SiC). Coatings were applied as aqueous slurries, which were then dried and abraded to a thickness of about 0.6 mm. Coated specimens were heated to 1200° C or higher to promote bonding within the coating and to the SiC, then were thermally cycled to 1200° C as a test of integrity and adherence of the coatings. Coatings containing mullite as a major phase performed best in thermal cycle tests. Subsequently, a single-layer coating and two duplex coatings were subjected to corrosion testing at 1200° C under conditions that are very corrosive to SiC. Although cracked and porous, one of the duplex coatings provided significant protection to the SiC. © 1990 Springer-Verlag New York Inc.
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收藏
页码:141 / 149
页数:9
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