US4599270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zirconium oxide powder containing cerium oxide and yttrium oxide
Assignee: Oerlikon Metco US Inc
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Filing: 1984-05-02
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Granted: 1986-07-08
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Expires: 2004-05-02
Abstract
Abstract A flame spray material for producing a low thermal conductivity ceramic coating is comprised of a homogeneous ceramic composition formed of zirconium oxide, cerium oxide and yttrium oxide. The composition is preferably in the form of composite particles each of which contains a plurality of subparticles of each of the oxide constituents bonded with an organic binder.
Inventors
- 👤 Subramaniam Rangaswamy
- 👤 John H. Harrington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:01
CPC Classifications
C; C23; C23C; C23C4/00; C23C4/04; C23C4/10; C23C4/11; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
109 words
A flame spray material characterized by ability to produce coatings having low thermal conductivity, comprising a homogeneous ceramic composition consisting of: zirconium oxide optionally containing up to about 10 percent of hafnium oxide based on the total weight of the zirconium oxide and hafnium oxide; cerium oxide; and yttrium oxide; the cerium oxide being present in an amount between about 23 and 29 percent based on the total weight of the zirconium oxide, hafnium oxide and cerium oxide; and the yttrium oxide being present in an amount between about 1 and 4 percent based on the total weight of the zirconium oxide, hafnium oxide, cerium oxide and yttrium oxide.
Claim 2
Dependent Claim
109 words
A flame spray material characterized by ability to produce coatings having low thermal conductivity, comprising a homogeneous ceramic composition consisting of: zirconium oxide optionally containing up to about 10 percent of hafnium oxide based on the total weight of the zirconium oxide and hafnium oxide; cerium oxide; and yttrium oxide; the cerium oxide being present in an amount between about 23 and 29 percent based on the total weight of the zirconium oxide, hafnium oxide and cerium oxide; and the yttrium oxide being present in an amount between about 1 and 4 percent based on the total weight of the zirconium oxide, hafnium oxide, cerium oxide and yttrium oxide.
Claim 3
Dependent Claim
29 words
Flame spray material according to claim 1 in which the homogeneous ceramic composition is in the form of powder having a size between about -100 mesh and +5 microns.
Claim 4
Dependent Claim
44 words
Flame spray material according to claim 2 in which the powder is in the form of composite particles each of which comprises a plurality of subparticles of zirconium oxide, cerium oxide and yttrium oxide, the subparticles having a size less than about 25 microns.
Claim 5
Dependent Claim
19 words
Flame spray powder according to claim 3 in which the subparticles have a size less than about 10 microns.
Claim 6
Dependent Claim
30 words
Flame spray material according to claim 3 in which the subparticles are bonded with organic binder in an amount between about 0.2 and 10 percent by weight of the composition.
Claim 7
Dependent Claim
14 words
Flame spray material according to claim 3 in which the composite particles are sintered.
Claim 8
Dependent Claim
18 words
Flame spray material according to claim 2 in which the powder is in the form of fused particles.
Claim 9
Dependent Claim
138 words
A flame spray powder having particles of size between about -200 mesh and +25 microns comprising: subparticles of unstabilized zirconium oxide containing up to about 10 percent by weight of hafnium oxide based on the total weight of the zirconium oxide and hafnium oxide; subparticles of cerium oxide; and subparticles of yttrium oxide; organic binder in an amount between about 0.2 percent and 10 percent by weight of the ceramic composition; the subparticles having a size less than about 10 microns; the cerium oxide being present in an amount of about 26 percent by weight of the total of the zirconium oxide, hafnium oxide and cerium oxide; and the yttrium oxide being present in an amount between about 2 and 3 percent by weight of the total of the zirconium oxide, hafnium oxide, cerium oxide and yttrium oxide.
Claim 10
Dependent Claim
138 words
A flame spray powder having particles of size between about -200 mesh and +25 microns comprising: subparticles of unstabilized zirconium oxide containing up to about 10 percent by weight of hafnium oxide based on the total weight of the zirconium oxide and hafnium oxide; subparticles of cerium oxide; and subparticles of yttrium oxide; organic binder in an amount between about 0.2 percent and 10 percent by weight of the ceramic composition; the subparticles having a size less than about 10 microns; the cerium oxide being present in an amount of about 26 percent by weight of the total of the zirconium oxide, hafnium oxide and cerium oxide; and the yttrium oxide being present in an amount between about 2 and 3 percent by weight of the total of the zirconium oxide, hafnium oxide, cerium oxide and yttrium oxide.
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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) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |