US4376710A
Expired / Lapsed
US
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High load carrying polyimide lubricative composites
Assignee: Raytheon Co
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Filing: 1981-03-30
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Granted: 1983-03-15
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Expires: 2001-03-30
Abstract
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.
Inventors
- 👤 Michael N. Gardos
- 👤 Arturo A. Castillo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:18
CPC Classifications
C; C10; C10M; C10M111/00; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/20; F16C33/201; C10M2201/00; C10M2201/04; C10M2201/041; C10M2201/042; C10M2201/05; C10M2201/06; C10M2201/061; C10M2201/062; C10M2201/065; C10M2201/066; C10M2201/085; C10M2201/10; C10M2201/105; C10M2201/16; C10M2201/18; C10M2217/00; C10M2217/04; C10M2217/044; C10M2217/045; C10N; C10N2040/00; C10N2040/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
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° 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.
Claim 2
Dependent Claim
93 words
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° 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.
Claim 3
Dependent Claim
45 words
A composite in accordance with claim 1 wherein said preform is a loosely woven preform having a fiber volume not to exceed 40%, and said pigments are selected from oxidatively stable lamellar solids having a unit cell a/c ratio equal to or greater than 1.95.
Claim 4
Dependent Claim
14 words
A lubricative composite of claim 2 wherein said preform is a carbon fiber preform.
Claim 5
Dependent Claim
26 words
A composite in accordance with claim 1 wherein said lubricative pigment is a pulverized compact having a particle size distribution of from 5 to 10 micrometers.
Claim 6
Dependent Claim
95 words
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° 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.
Claim 7
Dependent Claim
95 words
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° 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.
Claim 8
Dependent Claim
19 words
A composite of claim 5 wherein said compact is Ga/In/WSe 2 and said preform is a carbon fiber preform.
Claim 9
Dependent Claim
18 words
The composite of claim 1 in which said adjuvant is present in an amount less than about 2%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |