High load carrying polyimide lubricative composites
AssigneeHughes Aircraft Company
InventorsMichael N. Gardos, Arturo A. Castillo
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Abstract
Solid self-lubricating composites comprising carbon or graphite fiber preforms reinforced with high temperature resins and self-lubricating pigments are disclosed which withstand very high loads at very high temperatures.
Claims7
High load capacity, high temperature lubricative composites comprising a multidimensional weave preform, prepared from carbon fibers, graphite fibers or a combination thereof, modified by the addition of an adjuvant consisting essentially of diammonium hydrogen phosphate, and impregnated with a thermally stable high temperature polyimide resin containing lubricative pigments that are oxidatively stable in air up to 1,000.degree. F. wherein said polyimide resin is derived from an acetylene terminated polyimide oligomer whose general structure is ##STR1## where R" is phenylene --CO-- phenylene, R' is phenylene, R is phenylene oxyphenylene oxyphenylene and n is 1.
High temperature, high load capacity lubricative composites comprising multi-directional weave preforms selected from carbon fibers, graphite fibers or a combination thereof, modified by the addition of an adjuvant consisting essentially of diammonium hydrogen phosphate, and impregnated with a thermally stable high temperature polyimide resin containing lubricative pigments of pulverized compacts which are oxidatively stable in air up to 1,000.degree. F. wherein said polyimide resin is derived from an acetylene terminated polyimide oligomer whose general structure is ##STR2## where R" is phenylene --CO-- phenylene, R' is phenylene, R is phenylene oxyphenylene oxyphenylene and n is 1.
Dependencies are inferred from the claim text.