US4668262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective coating for refractory metal substrates
Assignee: Owens Corning Fiberglas Technology Inc
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Filing: 1985-12-30
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Granted: 1987-05-26
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Expires: 2005-12-30
Abstract
Abstract A refractory metal substrate suitable for use in contact with molten glass is coated with a chromium oxide outer coating and a molybdenum disilicide buffer coating to protect the substrate from oxidation at elevated temperatures, particularly during start up of an electric furnace.
Inventors
- 👤 Subhash S. Kithany
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:31
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/08; C03B37/095; C03B5/00; C03B5/16; C03B5/167; C03B5/1672; C03B5/42; C03B5/43; Y; Y10; Y10S; Y10S65/00; Y10S65/04; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12833
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
46 words
A refractory metal substrate suitable for use in contact with oxygen at 2300° F. where said substrate has a fused outer coating of Cr x O y , where x≧1 and Y≧1, and a buffer coating of MoSi 2 intermediate said substrate and said outer coating.
Claim 2
Dependent Claim
46 words
A refractory metal substrate suitable for use in contact with oxygen at 2300° F. where said substrate has a fused outer coating of Cr x O y , where x≧1 and Y≧1, and a buffer coating of MoSi 2 intermediate said substrate and said outer coating.
Claim 3
Dependent Claim
14 words
The refractory metal substrate of claim 1 in which said refractory metal is molybdenum.
Claim 4
Dependent Claim
14 words
The refractory metal substrate of claim 1 in which said refractory metal is tungsten.
Claim 5
Dependent Claim
44 words
The substrate of claim 2 in which said buffer coating has a thickness within the range of from about 0.5 mil. to about 1.5 mil., and said outer coating has a thickness within the range of from about 0.5 mil. to about 25 mil.
Claim 6
Dependent Claim
30 words
The substrate of claim 2 in which the ratio of thicknesses of said outer coating to said buffer coating is within the range of from about 10:1 to about 50:1.
Claim 7
Dependent Claim
40 words
A refractory metal substrate suitable for use in contact with oxygen at 2300° F. where the substrate has a fused outer coating of ZrO 2 , and a buffer coating of MoSi 2 intermediate said substrate and said outer coating.
Claim 8
Dependent Claim
40 words
A refractory metal substrate suitable for use in contact with oxygen at 2300° F. where the substrate has a fused outer coating of ZrO 2 , and a buffer coating of MoSi 2 intermediate said substrate and said outer coating.
Claim 9
Dependent Claim
54 words
An electrode for a glass melting furnace, the electrode being suitable for use in contact with oxygen at 2300° F., and comprising a molybdenum substrate, a fused outer coating of Cr x O y , where x≧1 and y≧1 and a buffer coating of MoSi 2 intermediate said molybdenum substrate and said outer coating.
Claim 10
Dependent Claim
54 words
An electrode for a glass melting furnace, the electrode being suitable for use in contact with oxygen at 2300° F., and comprising a molybdenum substrate, a fused outer coating of Cr x O y , where x≧1 and y≧1 and a buffer coating of MoSi 2 intermediate said molybdenum substrate and said outer coating.
Claim 11
Dependent Claim
54 words
A liner in a glass melting furnace, the liner being suitable for use in contact with oxygen at 2300° F., and comprising a molybdenum substrate, a fused outer coating of Cr x O y , where x≧1 and y≧1, and a buffer coating of MoSi 2 intermediate said molybdenum substrate and said outer coating.
Claim 12
Dependent Claim
54 words
A liner in a glass melting furnace, the liner being suitable for use in contact with oxygen at 2300° F., and comprising a molybdenum substrate, a fused outer coating of Cr x O y , where x≧1 and y≧1, and a buffer coating of MoSi 2 intermediate said molybdenum substrate and said outer coating.
Claim 13
Dependent Claim
54 words
A textile bushing for making glass fibers, the bushing being suitable for use in contact with oxygen at 2300° F., and comprising a molybdenum substrate, a fused outer coating of Cr x O y , where x≧1 and y≧1, and a buffer coating of MoSi 2 intermediate said molybdenum substrate and said outer coating.
Claim 14
Dependent Claim
54 words
A textile bushing for making glass fibers, the bushing being suitable for use in contact with oxygen at 2300° F., and comprising a molybdenum substrate, a fused outer coating of Cr x O y , where x≧1 and y≧1, and a buffer coating of MoSi 2 intermediate said molybdenum substrate and said outer coating.
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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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |