Patent US3891452A successfully refreshed from Google Patents.
US3891452A
Expired / Lapsed
US
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Refractory porcelain enamel passive control coating for high temperature alloys
Assignee: National Aeronautics and Space Administration
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Filing: 1973-04-11
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Granted: 1975-06-24
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Expires: 1993-04-11
Abstract
Abstract Porcelain enamel for use as a thermal control coating on hightemperature, nonferrous superalloy substrates is made up of a high-refractory-content boroaluminum silicate glass frit containing zirconium oxide, lithium fluoride, alkali metal and alkaline earth oxide-flux, zinc oxide and a submicron disperse phase of cubic-stabilized zirconium oxide. Enamel coatings embodying the invention exhibit favorable optical properties and a high coefficient of thermal expansion, providing compatibility with substrates of nonferrous superalloys and enabling coated parts of such alloys to withstand severe thermal cycling conditions without cracking.
Inventors
- 👤 George M Administrator Of Low
- 👤 Herman Levin
- 👤 Byron H Auker
- 👤 Michael N Gardos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:23
CPC Classifications
C; C23; C23D; C23D5/00; C23D5/02; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C3/076; C03C3/11; C03C3/112; C03C3/115; C03C3/118; C03C4/00; C03C8/00; C03C8/02; C03C8/06; C03C2204/00; C03C2204/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
39 words
A PROCELAIN ENAMEL COATING COMPOSITION WHICH EXHIBITS A LOWE ADSORPTANCE AND A HIGH EMITTANCE OF SOLAR RADIATION AND A HIGH COEFFICIENT OF THERMAL EXPANSION, AND MAINTAINS ITS PHYSICAL INTEGRITY UPON SUBJECTION TO SEVERE THERMAL CYCLING, COMPRISING: A FRIT COMPRISING:
Claim 2
Dependent Claim
39 words
A PROCELAIN ENAMEL COATING COMPOSITION WHICH EXHIBITS A LOWE ADSORPTANCE AND A HIGH EMITTANCE OF SOLAR RADIATION AND A HIGH COEFFICIENT OF THERMAL EXPANSION, AND MAINTAINS ITS PHYSICAL INTEGRITY UPON SUBJECTION TO SEVERE THERMAL CYCLING, COMPRISING: A FRIT COMPRISING:
Claim 3
Dependent Claim
11 words
The composition of claim 1 wherein said zirconium oxide is yttrium-doped.
Claim 4
Dependent Claim
33 words
The composition of claim 1 wherein said zirconium oxide dispersed phase is provided in an amount sufficient to produce a volume concentration thereof in a fused coating of 18 to 20 per cent.
Claim 5
Dependent Claim
21 words
The composition of claim 3 wherein the average particle size of said zirconium oxide disperse phase is 0.3 to 0.6 micron.
Claim 6
Dependent Claim
26 words
A porcelain enamel composition for use as a thermal control coating on nonferrous alloy substrates having a high coefficient of thermal expansion comprising a frit comprising:
Claim 7
Dependent Claim
26 words
A porcelain enamel composition for use as a thermal control coating on nonferrous alloy substrates having a high coefficient of thermal expansion comprising a frit comprising:
References Cited (Backward Citations)
US2294931A
Cited
US2326348A
Cited
US2324812A
Cited
US2483393A
Cited
US3703390A
Cited
US3709717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |