US5562998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Durable thermal barrier coating
Assignee: Honeywell International Inc
•
Filing: 1994-11-18
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Granted: 1996-10-08
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Expires: 2014-11-18
Abstract
Abstract A thermal barrier coating for superalloy turbine engine vanes and blades that are exposed to high temperature gas is disclosed. The coating includes an Aluminide or MCrAlY layer, an alumina layer, and a ceramic top layer. The ceramic layer has a columnar grain microstructure. A bond inhibitor is disposed in the gaps between the columnar grains. This inhibitor is either unstabilized zirconia, unstabilized hafnia, or a mixture thereof.
Inventors
- 👤 Thomas E. Strangman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:23
CPC Classifications
C; C23; C23C; C23C28/00; C23C28/30; C23C28/32; C23C28/321; C23C28/3215; C23C14/00; C23C14/06; C23C14/08; C23C14/083; C23C14/58; C23C28/34; C23C28/345; C23C28/3455; C23C4/00; C23C4/18; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12472; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12549; Y10T428/12583; Y10T428/1259; Y10T428/12611; Y10T428/12618; Y10T428/12771; Y10T428/12861; Y10T428/12931
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
114 words
A superalloy article having a ceramic thermal barrier coating on at least a portion of its surface, comprising: a superalloy substrate; a bond coat overlying the substrate and selected from the group consisting of aluminides and MCrAlY where M is a metal selected from the group consisting of iron, cobalt, nickel, and mixture thereof; a stabilized ceramic coat overlying the bond coat and having an outer surface, the stabilized ceramic coat having a microstructure characterized by a plurality of micron sized gaps extending from the outer surface towards the bond coat; and an unstabilized ceramic bond inhibitor disposed in substantially all of the gaps for inhibiting bonding between the stabilized ceramic across said gaps.
Claim 2
Dependent Claim
114 words
A superalloy article having a ceramic thermal barrier coating on at least a portion of its surface, comprising: a superalloy substrate; a bond coat overlying the substrate and selected from the group consisting of aluminides and MCrAlY where M is a metal selected from the group consisting of iron, cobalt, nickel, and mixture thereof; a stabilized ceramic coat overlying the bond coat and having an outer surface, the stabilized ceramic coat having a microstructure characterized by a plurality of micron sized gaps extending from the outer surface towards the bond coat; and an unstabilized ceramic bond inhibitor disposed in substantially all of the gaps for inhibiting bonding between the stabilized ceramic across said gaps.
Claim 3
Dependent Claim
19 words
The article of claim 1 further comprising a layer of alumina between the bond coat and the ceramic coat.
Claim 4
Dependent Claim
23 words
The article of claim 1 wherein said bond inhibitor is selected from a group consisting of unstabilized zirconia, unstabilized hafnia, and mixtures thereof.
Claim 5
Dependent Claim
13 words
The article of claim 1 wherein said microstructure is a columnar grain microstructure.
Claim 6
Dependent Claim
20 words
The article of claim 1 wherein said aluminide is selected from the group consisting of nickel aluminide and platinum aluminide.
Claim 7
Dependent Claim
102 words
A thermal barrier coating system for a superalloy substrate, comprising: a bond coat overlying the substrate and selected from the group consisting of aluminides and MCrAlY where M is metal selected from the group consisting of iron, cobalt, nickel and mixtures thereof; a stabilized ceramic coat overlying the bond coat and having an outer surface, the stabilized ceramic coat having a microstructure characterized by a plurality of micron sized gaps extending from the outer surface towards the bond coat; and an unstabilized ceramic bond inhibitor disposed in substantially all of the gaps for inhibiting bonding between the stabilized ceramic across said gaps.
Claim 8
Dependent Claim
102 words
A thermal barrier coating system for a superalloy substrate, comprising: a bond coat overlying the substrate and selected from the group consisting of aluminides and MCrAlY where M is metal selected from the group consisting of iron, cobalt, nickel and mixtures thereof; a stabilized ceramic coat overlying the bond coat and having an outer surface, the stabilized ceramic coat having a microstructure characterized by a plurality of micron sized gaps extending from the outer surface towards the bond coat; and an unstabilized ceramic bond inhibitor disposed in substantially all of the gaps for inhibiting bonding between the stabilized ceramic across said gaps.
Claim 9
Dependent Claim
23 words
The article of claim 6 wherein said bond inhibitor is selected from a group consisting of unstabilized zirconia, unstabilized hafnia, and mixtures thereof.
Claim 10
Dependent Claim
24 words
The article of claim 1 wherein said stabilized ceramic coat is selected from a group consisting of stabilized zirconia, stabilized hafnia, and mixtures thereof.
Claim 11
Dependent Claim
24 words
The article of claim 6 wherein said stabilized ceramic coat is selected from a group consisting of stabilized zirconia, stabilized hafnia, and mixtures thereof.
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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) | 1999-10-08 | 2000-04-08 | 2000-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-08 | 2004-04-08 | 2004-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-08 | 2008-04-08 | 2008-10-08 | $7700.00 | Window Closed / Lapsed |