Patent US3858742A successfully refreshed from Google Patents.
Patent US3900626A successfully refreshed from Google Patents.
US3900626A
Expired / Lapsed
US
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Tantalum wire reinforced silicon nitride articles and method for making the same
Assignee: RTX Corp
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Filing: 1973-09-04
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Granted: 1975-08-19
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Expires: 1993-09-04
Abstract
Abstract A reinforced ceramic article comprises a matrix material of Si3N4 with reinforcing filaments of tantalum. The article has excellent impact strength over a wide range of temperatures. A method for making the article is also disclosed.
Inventors
- 👤 John J Brennan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:32
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/74; C04B35/76; C04B35/515; C04B35/58; C04B35/584; C04B35/593; F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; F01D5/284; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/12; Y10T428/12326; Y10T428/1234; Y10T428/12486; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T428/24132; Y10T428/249921; Y10T428/249924; Y10T428/249928; Y10T428/249929
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
90 words
AN IMPACT RESISTANT FIBER-REINFORCED COMPOSITE ARTICLE SUITABLE FOR USE IN A GAS TURBINE ENGINE ENVIRONMENT COMPRISING A PLURALITY OF CONTINUOUS TANTALUM WIRES PREFERENTIALLY ORIENTED AND COMPLETELY EMBEDDED IN A HOT-PRESSED, SI3N4 MATRIX WHICH APPROACHES FULL DENSIFICATION, EACH OF SAID WIRES HAVING A LAYER OF TANTALUM SILICIDE THEREON, SAID TANTALUM SILICIDE LAYER BEING CHEMICALLY BONDED TO SAID WIRES AND SAID MATRIX, SAID COMPOSITE ARTICLE EXHIBITING, AS A MODE OF BREAKAGE AS A RESULT OF CHARPY IMPACT TESTS, EITHER A COMBINATION OF DUCTILE FIBER ELONGATION PLUS INTERFACIAL SPLITTING OR DUCTILE FIBER FRACTURE.
Claim 2
Dependent Claim
90 words
AN IMPACT RESISTANT FIBER-REINFORCED COMPOSITE ARTICLE SUITABLE FOR USE IN A GAS TURBINE ENGINE ENVIRONMENT COMPRISING A PLURALITY OF CONTINUOUS TANTALUM WIRES PREFERENTIALLY ORIENTED AND COMPLETELY EMBEDDED IN A HOT-PRESSED, SI3N4 MATRIX WHICH APPROACHES FULL DENSIFICATION, EACH OF SAID WIRES HAVING A LAYER OF TANTALUM SILICIDE THEREON, SAID TANTALUM SILICIDE LAYER BEING CHEMICALLY BONDED TO SAID WIRES AND SAID MATRIX, SAID COMPOSITE ARTICLE EXHIBITING, AS A MODE OF BREAKAGE AS A RESULT OF CHARPY IMPACT TESTS, EITHER A COMBINATION OF DUCTILE FIBER ELONGATION PLUS INTERFACIAL SPLITTING OR DUCTILE FIBER FRACTURE.
Claim 3
Dependent Claim
17 words
The fiber-reinforced composite article according to claim 1 wherein said matrix includes MgO as a densification agent.
References Cited (Backward Citations)
US3427185A
Cited
US3766000A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |