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OwnerJames C. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Fletcher, Wayne M. Phillipsinventors
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Cermet compositions having high temperature oxidation resistance, high hardness and high abrasion and wear resistance, and particularly adapted for production of high temperature resistant cermet insulator bodies, comprising 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. Also disclosed are novel ceramic compositions comprising a sintered solid solution of aluminum oxide, silicon nitride and aluminum nitride. The cermet compositions are designed particularly to provide high temperature resistant refractory coatings on metal substrates, preferably molybdenum or tungsten substrates.
A high temperature oxidation resistant cermet composition having high strength and abrasion resistance and resistance to thermal shock, comprising a sintered body consisting essentially of high temperature resistant metal particles selected from the group consisting of molybdenum, tungsten, tantalum and niobium particles, dispersed in a solid solution of silicon nitride, aluminum nitride and an oxide selected from the group consisting of aluminum oxide, yttrium oxide and chromium oxide, and mixtures thereof, said cermet composition having good adhesion to substrates of a metal as defined above.
A cermet composition having high temperature oxidation resistance, and high abrasion and erosion resistance, high strength and resistance to thermal shock, comprising a sintered body consisting essentially of metal particles selected from the group consisting of molybdenum, tungsten, tantalum and niobium particles, coated with and dispersed in a solid solution of silicon nitride, aluminum nitride and an oxide selected from the group consisting of aluminum oxide, yttrium oxide and chromium oxide, and mixtures thereof, in molar proportions defined by the area bounded by points A, B, C and D on the ternary diagram in the accompanying drawing, said cermet composition having good adhesion to substrates of a metal as defined above.
Dependencies are inferred from the claim text.