US4252856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemically bonded aluminum coated carbon via monocarbides
Assignee: Graftech International Holdings Inc
•
Filing: 1978-02-01
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Granted: 1981-02-24
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Expires: 1998-02-01
Abstract
Abstract An aluminum coated carbon article or composite, and process therefor having aluminum chemically bonded to carbon via an interface of a metal monocarbide formed in situ when an intermetallic phase comprising aluminum and a metal capable of reacting with carbon to form a metal carbide is reduced by carbon to aluminum and a metal carbide, the metal selected from the group consisting of tantalum, titanium and hafnium.
Inventors
- 👤 Raymond V. Sara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:26
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B23; B23K; B23K35/00; B23K35/02; B23K35/0205; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; C23; C23C; C23C28/00; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
A carbon article having at least a portion of its surface chemically bonded to aluminum via a metal carbide interfacial bond, said metal being selected from the group consisting of tantalum, titanium and hafnium, said metal carbide having been formed in situ in the presence of said aluminum and with the formation of aluminum carbide substantially prevented.
Claim 2
Dependent Claim
57 words
A carbon article having at least a portion of its surface chemically bonded to aluminum via a metal carbide interfacial bond, said metal being selected from the group consisting of tantalum, titanium and hafnium, said metal carbide having been formed in situ in the presence of said aluminum and with the formation of aluminum carbide substantially prevented.
Claim 3
Dependent Claim
28 words
The carbon article of claim 1 being a graphite electrode and having an interfacial bond thickness of about 0.0001 inch and an aluminum thickness of about 0.02 inch.
Claim 4
Dependent Claim
33 words
The carbon article of claim 1 wherein said metal is tantalum; and wherein nickel is present in the aluminum in an amount between about 1% and 15% of the weight of the aluminum.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |