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High temperature resistant cermet and ceramic compositionsHigh temperature oxidation resistance, high hardness and high abrasion and wear resistance are properties of cermet compositions particularly to provide high temperature resistant refractory coatings on metal substrates, for use as electrical insulation seals for thermionic converters. The compositions comprise a sintered body of particles of a high temperature resistant metal or metal alloy, preferably molybdenum or tungsten particles, dispersed in and bonded to a solid solution formed of aluminum oxide and silicon nitride, and particularly a ternary solid solution formed of a mixture of aluminum oxide, silicon nitride and aluminum nitride. Ceramic compositions comprising a sintered solid solution of aluminum oxide, silicon nitride and aluminum nitride are also described.
Document ID
19780011359
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Phillips, W. M. (JPL)
Date Acquired
September 3, 2013
Publication Date
February 7, 1978
Subject Category
Nonmetallic Materials
Accession Number
78N19302
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
US-PATENT-4,072,532|NASA-CASE-NPO-13690-1
Patent Application
US-PATENT-APPL-SN-633876

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