C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
25/142
C04B 35/48 (2006.01) C01G 25/02 (2006.01) C04B 35/486 (2006.01)
Patent
CA 1315077
ABSTRACT OF THE DISCLOSURE A ceramic article having good fractured toughness comprising substantially spherical ceramic particles, which may be a ceramic oxide such as zirconia or zirconia combined with yttrium oxide. The ceramic particles are compacted and sintered to a density greater than 90 percent of theoretical density. The article is characterized by a substantially uniform chemical composition and a substantially inclusion-free, homogeneous microstructure, which may be a metastable crystalline phase with less than 10 volume percent monoclinic crystalline phase. The article is produced by dissolving, such as in water, a soluble compound containing a metal, e.g. zirconium, to form a solute. A precipitation agent, such as sodium hydroxide or ammonium hydroxide, is combined with the solute to precipitate a hydrophilic colloid of the metal hydroxide, such as zirconium hydroxide. The precipitate is formed into particles which are rapidly solidified while pre- venting agglomeration thereof. The particles are dried, com- pressed to increase density and reduce size, calcined to convert the metal hydroxide to oxide, e.g. zirconium oxide, and then the particles are compacted and sintered to form a dense ceramic article.
568359
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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