Patent US4234630A successfully refreshed from Google Patents.
US4234630A
Expired / Lapsed
US
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Process for the protection of carbon bodies
Assignee: Consortium fuer Elektrochemische Industrie GmbH
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Filing: 1979-08-13
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Granted: 1980-11-18
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Expires: 1999-08-13
Abstract
Abstract A process for protecting carbon bodies against attack by molten silicon by applying a separating protective layer is provided which is characterized in that a separating layer is applied to the surface of the carbon body to be protected in such a manner as to wet it. The separating layer consists of alkaline earth metal fluorides in admixture with 0 to 90 mole % of alkaline earth metal silicates having a melting point lower than that of silicon.
Inventors
- 👤 Josef Dietl
- 👤 Michael Wohlschlager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:48
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/02; C30B29/06; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5018; C04B41/5022; C04B41/80; C04B41/81; C04B41/85; C04B41/86; C30B11/00; C30B15/00; C30B15/10; C30B35/00; C30B35/002; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
In a process for protecting carbon bodies against attack by molten silicon comprising the step of: applying to the surface of the carbon body to be protected a separating protective layer comprising alkaline earth metal fluorides in admixture with 0 to 90 mole % of alkaline earth metal silicates have a melting point lower than that of silicon, said layer being applied in a manner which results in the wetting of the surface of said carbon body.
Claim 2
Dependent Claim
77 words
In a process for protecting carbon bodies against attack by molten silicon comprising the step of: applying to the surface of the carbon body to be protected a separating protective layer comprising alkaline earth metal fluorides in admixture with 0 to 90 mole % of alkaline earth metal silicates have a melting point lower than that of silicon, said layer being applied in a manner which results in the wetting of the surface of said carbon body.
Claim 3
Dependent Claim
21 words
The process according to claim 1, wherein a mixture of calcium fluoride and calcium silicate is applied as the separating layer.
Claim 4
Dependent Claim
23 words
The process according to claim 1, wherein a mixture of calcium fluoride with 40 to 70 mole % of calcium silicate is applied.
Claim 5
Dependent Claim
29 words
The process according to claim 1, wherein 2 to 5% by weight of silicon is added to the mixture used as the separating layer in order to improve wetting.
Claim 6
Dependent Claim
33 words
The process according to claim 1, wherein said separating protective layer is applied by briefly immersing the carbon body in the molten mixture of alkaline earth metal fluorides and alkaline earth metal silicates.
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) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |