Patent US4248440A successfully refreshed from Google Patents.
US4248440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titania-alumina-yttria piston ring facing
Assignee: Sanford Acquisition Co
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Filing: 1979-09-12
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Granted: 1981-02-03
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Expires: 1999-09-12
Abstract
Abstract Disclosed is a coating for bearing faces of piston rings and a powder composition for plasma spray application of such coating. The plasma spray powder comprises 94%-98% by weight of aluminum oxide and titanium oxide and 2%-6% by weight of yttrium oxide. The inclusion of yttrium oxide in the aluminum oxide-titanium oxide coating composition reduces the tendency of the coating to blistering and spalling which resulting in coating loss during use of the ring. Intra-coating delamination is substantially reduced or eliminated.
Inventors
- 👤 Harold E. McCormick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:01
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/46; C04B35/462; C04B35/478; C23; C23C; C23C4/00; C23C4/04; C23C4/10; C23C4/11; F; F16; F16J; F16J9/00; F16J9/26; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3224; C04B2235/3225; C04B2235/3231; C04B2235/3232
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
29 words
A powder composition for application to a bearing surface by plasma spray technique, said composition consisting about 60%-90% by weight of alumina, about 8%-35% titania and about 2%-6% yttria.
Claim 2
Dependent Claim
29 words
A powder composition for application to a bearing surface by plasma spray technique, said composition consisting about 60%-90% by weight of alumina, about 8%-35% titania and about 2%-6% yttria.
Claim 3
Dependent Claim
17 words
The powder composition as described in claim 1 consisting of 83% alumina, 14% titania, and 3% yttria.
Claim 4
Dependent Claim
24 words
The powder composition as described in claim 2 wherein said powder has a particle size in the range of -270 mesh to +10 microns.
Claim 5
Dependent Claim
17 words
The powder composition as described in claim 1 in which alumina is 60% and titania is 35%.
Claim 6
Dependent Claim
21 words
The powder composition as described in claim 4 wherein the powder has a particle size of -325 mesh to +5 microns.
Claim 7
Dependent Claim
53 words
A piston ring having a bearing face coating applied thereto by a plasma spray technique, the plasma sprayed powder of refractory metal oxide consisting of from 60%-90% alumina by weight of said coating, from 8%-35% titania and from 2%-6% yttria, the resultant coating being resistant to spalling and blistering delamination within the coating.
Claim 8
Dependent Claim
53 words
A piston ring having a bearing face coating applied thereto by a plasma spray technique, the plasma sprayed powder of refractory metal oxide consisting of from 60%-90% alumina by weight of said coating, from 8%-35% titania and from 2%-6% yttria, the resultant coating being resistant to spalling and blistering delamination within the coating.
Claim 9
Dependent Claim
39 words
The piston ring as described in claim 6 wherein said yttria is present in an amount of 3%, said alumina is present in an amount of 83% and said titania is present in an amount of 14% by weight.
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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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |