US4007049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal shock resistant ceramic composite
Assignee: United States Department of the Air Force
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Filing: 1968-08-06
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Granted: 1977-02-08
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Expires: 1988-08-06
Abstract
Abstract A ceramic material characterized by a high degree of resistance to failure by thermal fracture which comprises a composite of a refractory oxide and flaked boron nitride. The boron nitride flakes are incorporated into a refractory oxide matrix as an inert, nonreactive, uniform dispersed phase in proportions sufficient to provide the oxide composite with an increased resistance to thermal shock.
Inventors
- 👤 Ronald C. Rossi
- 👤 Robert D. Carnahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:56
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03; C04B35/04; C04B35/053; C04B35/08; C04B35/10; C04B35/111; C04B35/51; C04B35/622; C04B35/64; C04B35/645
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
44 words
A hot-pressed ceramic oxide composite possessing a high degree of resistance to failure from thermal fracture, said composite consisting essentially of a blend composed of about 5 to 30 percent by volume of boron nitride flakes uniformly dispersed in a powdered refractory oxide matrix.
Claim 2
Dependent Claim
44 words
A hot-pressed ceramic oxide composite possessing a high degree of resistance to failure from thermal fracture, said composite consisting essentially of a blend composed of about 5 to 30 percent by volume of boron nitride flakes uniformly dispersed in a powdered refractory oxide matrix.
Claim 3
Dependent Claim
28 words
A hot-pressed ceramic oxide composite in accordance with claim 1 wherein said refractory oxide is selected from the group of oxides consisting of aluminum, beryllium, magnesium and thorium.
Claim 4
Dependent Claim
69 words
A hot-pressed ceramic oxide composite possessing a high degree of resistance to failure from thermal fracture, said composite consisting essentially of a blend composed of about 5 to 30 percent by volume of flaked pyrolitic boron nitride having a flake size of about 0.003 to 0.015 inches in diameter with a diameter to thickness ratio of about 10:1 uniformly dispersed in a refractory oxide matrix of powdered beryllium oxide.
Claim 5
Dependent Claim
69 words
A hot-pressed ceramic oxide composite possessing a high degree of resistance to failure from thermal fracture, said composite consisting essentially of a blend composed of about 5 to 30 percent by volume of flaked pyrolitic boron nitride having a flake size of about 0.003 to 0.015 inches in diameter with a diameter to thickness ratio of about 10:1 uniformly dispersed in a refractory oxide matrix of powdered beryllium oxide.
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) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |