Abstract
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.
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Research sponsored by the Waste Energy Recovery Program, Office of Industrial Programs, U.S. Department of Energy, under contract DE-ACo5-840R21400 with Martin Marietta Energy Systems, Inc.
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Federer, J.I. Alumina base coatings for protection of SiC ceramics. J. Materials Engineering 12, 141–149 (1990). https://doi.org/10.1007/BF02834067
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DOI: https://doi.org/10.1007/BF02834067