EP0156491A2
Expired / Lapsed
EP
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Formation of fine particle sinterable ceramic powders
Assignee: Motors Liquidation Co
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Filing: 1985-02-18
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Granted: —
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Expires: 2005-02-18
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 Louis Micheli
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 03:59
CPC Classifications
C; 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; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/48; C04B35/486; C04B35/50; C04B35/505; C04B35/622; C04B35/626; C01P; C01P2002/00; C01P2002/10; C01P2004/00; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/10; C01P2006/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A method of preparing a metal-oxygen composition in the form of sinterable ceramic precursor powder characterised in that the method comprises mixing an aqueous solution of polyvalent cations of the desired metal constituent or constituents with an aqueous solution containing poly (acrylic acid) anions to form a metal polyacrylate precipitate, separating the precipitate from the aqueous mother liquor, burning out the organic portion of the precipitate and, if necessary, calcining the ash to form a sinterable desired metal-oxygen composition.
Claim 2
Independent Claim
79 words
A method of preparing a metal-oxygen composition in the form of sinterable ceramic precursor powder characterised in that the method comprises mixing an aqueous solution of polyvalent cations of the desired metal constituent or constituents with an aqueous solution containing poly (acrylic acid) anions to form a metal polyacrylate precipitate, separating the precipitate from the aqueous mother liquor, burning out the organic portion of the precipitate and, if necessary, calcining the ash to form a sinterable desired metal-oxygen composition.
Claim 3
Dependent Claim
46 words
A method of preparing a sinterable metal-oxygen composition ceramic precursor powder according to claim 1, characterised in that the aqueous solution of polyvalent cations of the desired metal constituent or constiuents is mixed with an aqueous solution of ammonium polyacrylate to form said metal polyacrylate precipitate.
Claim 4
Dependent Claim
95 words
A method of preparing, according to claim 1, zirconia powder that, when combined with a tetragonal crystal stabilizing amount of yttria, is readily compactible and sinterable to a dense, strong, zirconia body of tetragonal crystal structure, characterised in that the method comprises mixing an aqueous solution comprising polyvalent zirconium ions and, optionally, polyvalent yttrium ions, with an aqueous solution of poly (acrylic acid) anions to form a precipitate comprising zirconium polyacrylate, separating the precipitate from the mother liquor, and burning out the organic portion of the precipitate, and calcining the ash to form zirconia powder.
Claim 5
Dependent Claim
77 words
A method of preparing, according to claim 1, yttria powder in a form that can be compacted and sintered to form a dense, strong, yttria body, characterised in that the method comprises mixing an aqueous solution of polyvalent yttrium ions with an aqueous solution of poly (acrylic acid) anions 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
Dependent Claim
77 words
A method of preparing, according to claim 1, titania powder in a form that can be compacted and sintered to form a dense, strong, titania body, characterised in that the method comprises mixing an aqueous solution of polyvalent titanium ions with an aqueous solution of poly (acrylic acid) anions to precipitate titanium polyacrylate, separating the precipitate from the mother liquor, and burning out the organic portion of the precipitate and calcining the ash to form titania powder.
Claim 7
Dependent Claim
104 words
A method of preparing, according to claim 1, a titanate compound powder that can be compacted and sintered to form a dense, strong, titanate compound body, characterised in that the method comprises mixing an aqueous solution - comprising polyvalent titanium ions and polyvalent ions of a metal taken from the group consisting of barium and lead with an aqueous solution of poly (acrylic acid) anions to form a precipitate containing the polyacrylates of titanium and the other said metal, separating the precipitate from the mother liquor, and burning out the organic matter and, if necessary, calcining the ash to form the titanate compound powder.
References Cited (Backward Citations)
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