Nippon Shokubai Kagaku Kogyo Co., Ltd.

Teruyuki Moto

Kazuo Hata

Shigemi Osaka

Tsukasa Takahashi

Tsukawa Takahashi

A highly concentrated zirconia sol is produced by a method which comprises heating an aqueous solution of a zirconium salt in the presence of urea thereby obtaining a transparent zirconia sol, concentrating the zirconium sol with an ultrafilter membrane, and subjecting the concentrated zirconic sol to thermal concentration at a temperature of not higher than 80.degree. C. The sol thus obtained enjoys lasting stability. Optionally, this sol may incorporate therein a chelating agent and a compound of a metal other than zirconium. A slurry of the zirconia sol incorporating therein minute refractory particles is useful for the manufacture of a porous ceramic article. A ceramic product obtained by firing this slurry is advantageously used in a mold for casting.

Zirconia sol, method for production thereof, porous ceramic-producing

A zirconia sol, comprising a transparent zirconia sol obtained by hydrolysis of zirconyl ammonium carbonate and a chelating agent incorporated in said transparent zirconia sol.

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Himeji, Japan

Teruyuki Moto