Patent US4900640A successfully refreshed from Google Patents.
US4900640A
Expired / Lapsed
US
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Low coefficient of expansion alloys having a thermal barrier
Assignee: Vale Canada Ltd
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Filing: 1988-04-19
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Granted: 1990-02-13
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Expires: 2008-04-19
Abstract
Abstract A low coefficient of expansion alloy is coated with a thermal barrier coating having a low coefficient of expansion compatible with the alloy. The alloy, preferably a 900 series iron-base alloy, includes an oxidation resistant intermediate bond coating and a zirconia containing thermal barrier. An article of manufacture made from this material could be utilized in heat engines where close tolerances are mandated.
Inventors
- 👤 James A. E. Bell
- 👤 John J. deBarbadillo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:49
CPC Classifications
C; C23; C23C; C23C28/00; C23C28/30; C23C28/32; C23C28/321; C23C28/3215; C23C28/34; C23C28/345; C23C28/3455; C23C4/00; C23C4/02; F; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12618; Y10T428/12771; Y10T428/12861; Y10T428/12931; Y10T428/12951; Y10T428/12972; Y10T428/12979
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
81 words
An improved coated article of manufacture having a thermal barrier coating system including a substrate, an intermediate bond coating registered with the substrate, and a thermal barrier coating over the intermediate bond coating, the improvement comprising the substrate made from an iron-nickel containing alloy having a low linear coefficient of expansion of about 10 μm/m/° C. at about 649° C., the linear coefficient of expansion of the iron-nickel containing alloy approximating the linear coefficient of expansion of the thermal barrier coating.
Claim 2
Dependent Claim
81 words
An improved coated article of manufacture having a thermal barrier coating system including a substrate, an intermediate bond coating registered with the substrate, and a thermal barrier coating over the intermediate bond coating, the improvement comprising the substrate made from an iron-nickel containing alloy having a low linear coefficient of expansion of about 10 μm/m/° C. at about 649° C., the linear coefficient of expansion of the iron-nickel containing alloy approximating the linear coefficient of expansion of the thermal barrier coating.
Claim 3
Dependent Claim
22 words
The improved article according to claim 1 wherein the substrate is selected from the 900 series of low coefficient of expansion alloys.
Claim 4
Dependent Claim
26 words
The improved article according to claim 2 wherein the substrate includes about 38% nickel, about 13% cobalt, about 4.7 niobium, 1.5% titanium and about 42% iron.
Claim 5
Dependent Claim
30 words
The improved article according to claim 1 wherein the thermal barrier coating includes sintered 8% Y 2 O 3 -ZrO 2 having a microstructure consisting of a stable tetragonal phase.
Claim 6
Dependent Claim
31 words
The improved article according to claim 1 wherein the intermediate bond coating includes ZA1 wherein Z is selected from the group consisting of Ni, Fe, Co, Cr, Y, and mixtures thereof.
Claim 7
Dependent Claim
19 words
The improved article according to claim 1 including an air passage formed within the article for cooling the article.
Claim 8
Dependent Claim
30 words
The improved article according to claim 1 wherein the intermediate coating has a thickness of about 0.1 mm, and the thermal barrier coating has a thickness of about 0.5 mm.
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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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |