Patent US4627966A successfully refreshed from Google Patents.
US4627966A
Expired / Lapsed
US
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Formation of fine particle sinterable ceramic powders
Assignee: Motors Liquidation Co
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Filing: 1986-04-10
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Granted: 1986-12-09
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Expires: 2006-04-10
Abstract
Abstract Sinterable metal-oxygen composition powders are prepared by mixing aqueous solutions of the metal salt and of poly(acrylic acid), or its ammonium salt, to form a precipitate which is dried, ignited to remove the organic composition and calcined to form the metal oxide or metal-oxygen compound powder.
Inventors
- 👤 Adolph L. Micheli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:48
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C01; C01B; C01B13/00; C01B13/14; C01B13/18; C01B13/185; C01B13/36; C01B13/363; C01F; C01F17/00; C01F17/20; C01F17/206; C01F17/218; C01F7/00; C01F7/02; C01G; C01G23/00; C01G23/003; C01G23/006; C01G23/04; C01G23/047; C01G25/00; C01G25/02; C04B35/01; C04B35/46; C04B35/48; C04B35/486; C04B35/50; C04B35/505; C01P; C01P2002/00; C01P2002/10; C01P2004/00; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/10; C01P2006/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
A method of preparing a sinterable metal oxide ceramic precursor powder, comprising mixing an aqueous solution of polyvalent metal cations of one or more metals taken from the group consisting of yttrium and zirconium with an aqueous solution of ammonium polyacrylate to form a metal polyacrylate precipitate, separating the precipitate from the aqueous mother liquid, burning out the organic portion of the precipitate, and calcining the ash to form a sinterable ceramic percursor powder.
Claim 2
Independent Claim
74 words
A method of preparing a sinterable metal oxide ceramic precursor powder, comprising mixing an aqueous solution of polyvalent metal cations of one or more metals taken from the group consisting of yttrium and zirconium with an aqueous solution of ammonium polyacrylate to form a metal polyacrylate precipitate, separating the precipitate from the aqueous mother liquid, burning out the organic portion of the precipitate, and calcining the ash to form a sinterable ceramic percursor powder.
Claim 3
Independent Claim
86 words
A method of preparing zirconia powder combined with a tetragonal crystal stabilizing amount of yttria that is readily compactible and sinterable to a dense, strong, zirconia body of tetragonal crystal structure, comprising mixing an aqueous solution comprising polyvalent zirconium ions and polyvalent yttrium ions, with an aqueous solution of ammonium polyacrylate to form a precipitate comprising zirconium polyacrylate and yttrium polyacrylate, separating the precipitate from the mother liquor, and burning out the organic portion of the precipitate, and calcining the ash to form yttria-containing zirconia powder.
Claim 4
Independent Claim
86 words
A method of preparing zirconia powder combined with a tetragonal crystal stabilizing amount of yttria that is readily compactible and sinterable to a dense, strong, zirconia body of tetragonal crystal structure, comprising mixing an aqueous solution comprising polyvalent zirconium ions and polyvalent yttrium ions, with an aqueous solution of ammonium polyacrylate to form a precipitate comprising zirconium polyacrylate and yttrium polyacrylate, separating the precipitate from the mother liquor, and burning out the organic portion of the precipitate, and calcining the ash to form yttria-containing zirconia powder.
Claim 5
Independent Claim
66 words
A method of preparing yttria powder in a form that can be compacted and sintered to form a dense, strong, yttria body, comprising mixing an aqueous solution of polyvalent yttrium ions with an aqueous solution of ammonium polyacrylate to precipitate yttrium polyacrylate, separating the precipitate from the mother liquor, and burning out the organic portion of the precipitate and calcining the ash to form yttria powder.
Claim 6
Independent Claim
66 words
A method of preparing yttria powder in a form that can be compacted and sintered to form a dense, strong, yttria body, comprising mixing an aqueous solution of polyvalent yttrium ions with an aqueous solution of ammonium polyacrylate to precipitate yttrium polyacrylate, separating the precipitate from the mother liquor, and burning out the organic portion of the precipitate and calcining the ash to form yttria powder.
References Cited (Backward Citations)
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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) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |