Patent US4548832A successfully refreshed from Google Patents.
US4548832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Materials
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1983-03-18
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Granted: 1985-10-22
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Expires: 2003-03-18
Abstract
Abstract The present invention relates to materials and more particularly to particulate materials suitable for use as thermal spraying powders. There is disclosed a process for the preparation of a particulate material suitable for use as a thermal spraying powder which includes treating a mixture comprising an inorganic substance as a major component (as defined in the Specification) and a sol to gel the sol thereby to form an intermediate material comprising inorganic substance and gel and heating the intermediate material. One example of thermal spraying is plasma spraying.
Inventors
- 👤 James L. Woodhead
- 👤 Keith T. Scott
- 👤 Alan Wilcockson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:33
CPC Classifications
C; C09; C09D; C09D1/00; B; B01; B01J; B01J2/00; B01J2/02; B01J2/06; B01J2/08; C23; C23C; C23C4/00; C23C4/04; C23C4/10; C23C4/11; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
66 words
A process for the preparation of a particulate material suitable for use as a thermal spraying powder which includes treating a mixture comprising chromia as a major component and a zirconia sol to gel the sol thereby to form a particulate intermediate material comprising chromia and zirconia gel and heating the intermediate material to produce a particulate material suitable for use as a thermal spraying powder.
Claim 2
Dependent Claim
66 words
A process for the preparation of a particulate material suitable for use as a thermal spraying powder which includes treating a mixture comprising chromia as a major component and a zirconia sol to gel the sol thereby to form a particulate intermediate material comprising chromia and zirconia gel and heating the intermediate material to produce a particulate material suitable for use as a thermal spraying powder.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1 wherein the mixture is spray dried to gel the sol.
Claim 4
Dependent Claim
29 words
A process as claimed in claim 1 wherein the mixture is dispersed in an immiscible liquid and subjected to the influence of a gelling agent to gel the sol.
Claim 5
Dependent Claim
30 words
A process as claimed in claim 3 wherein the gelling reagent comprises ammonia or a base capable of extracting anions from the sol in the mixture to effect gelling thereof.
Claim 6
Dependent Claim
18 words
A process as claimed in claim 1 wherein the chromia is in the form of an aqueous solution.
Claim 7
Dependent Claim
17 words
A process as claimed in claim 1 wherein the chromia is in the form of a powder.
Claim 8
Dependent Claim
17 words
A process as claimed in claim 6 wherein the chromia powder has a particle size of ≦1μ.
Claim 9
Dependent Claim
17 words
A process as claimed in claim 1 wherein the mixture contains less than 20% w/o zirconia sol.
Claim 10
Dependent Claim
17 words
A process as claimed in claim 8 wherein the mixture contains 5 to 10 w/o zirconia sol.
Claim 11
Dependent Claim
17 words
A process as claimed in claim 1 wherein the mixture also contains Y 2 O 3 .
Claim 12
Dependent Claim
20 words
A process as claimed in claim 1 wherein the product particulate material has a particle size between 10μ to 70μ.
Claim 13
Dependent Claim
20 words
A process as claimed in claim 11 wherein the product particulate material has a particle size between μ to 25μ.
Claim 14
Dependent Claim
35 words
A process comprising thermal spraying a particulate material comprising chromia and zirconia formed by heating a zirconia gel, said gel being formed from a mixture of a zirconia sol and a major amount of chromia.
Claim 15
Dependent Claim
35 words
A process comprising thermal spraying a particulate material comprising chromia and zirconia formed by heating a zirconia gel, said gel being formed from a mixture of a zirconia sol and a major amount of chromia.
Claim 16
Dependent Claim
39 words
A particulate material suitable for use as a thermal spraying powder comprising chromia and zirconia formed from a zirconia gel by heating, said gel being formed from a mixture of a zirconia sol and a major amount of chromia.
Claim 17
Dependent Claim
39 words
A particulate material suitable for use as a thermal spraying powder comprising chromia and zirconia formed from a zirconia gel by heating, said gel being formed from a mixture of a zirconia sol and a major amount of chromia.
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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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |