US4450184A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow sphere ceramic particles for abradable coatings
Assignee: Applied Biosystems Inc
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Filing: 1982-02-16
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Granted: 1984-05-22
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Expires: 2002-02-16
Abstract
Abstract A hollow sphere ceramic flame spray powder is disclosed. The desired constituents are first formed into agglomerated particles in a spray drier. Then the agglomerated particles are introduced into a plasma flame which is adjusted so that the particles collected are substantially hollow. The hollow sphere ceramic particles are suitable for flame spraying a porous and abradable coating. The hollow particles may be selected from the group consisting of zirconium oxide and magnesium zirconate.
Inventors
- 👤 Frank N. Longo
- 👤 Nicholas F. Bader, III
- 👤 Mitchell R. Dorfman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:24
CPC Classifications
F; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/122; C; C23; C23C; C23C4/00; C23C4/04; C23C4/10; C23C4/11; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
48 words
A process for producing an abradable porous coating comprising flame spraying hollow spheres made of a refractory metal oxide selected from the group consisting of zirconium oxide and magnesium zirconate where each hollow sphere has a size between about -100 mesh, U.S. standard screen size, and +5 microns.
Claim 2
Dependent Claim
48 words
A process for producing an abradable porous coating comprising flame spraying hollow spheres made of a refractory metal oxide selected from the group consisting of zirconium oxide and magnesium zirconate where each hollow sphere has a size between about -100 mesh, U.S. standard screen size, and +5 microns.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein said refractory oxide may additionally include magnesium oxide, halfnium oxide, cerium oxide, yttrium oxide and combinations thereof.
Claim 4
Dependent Claim
26 words
A process according to claim 1 in which said hollow spheres have a size preferably between about -120 mesh and +325 mesh U.S. standard screen sizes.
Claim 5
Dependent Claim
23 words
A process according to claim 1 in which said hollow spheres have an apparent density of approximately 15% to 50% of theoretical density.
Claim 6
Dependent Claim
19 words
A process according to claim 1 in which said flame spraying is effected with a plasma flame spray gun.
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) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |