Compositions – Preservative agents – Anti-corrosion
Patent
1992-11-13
1994-01-04
Group, Karl
Compositions
Preservative agents
Anti-corrosion
501103, B01J 1300
Patent
active
052757595
ABSTRACT:
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.
REFERENCES:
patent: 3157601 (1964-11-01), Fitch
patent: 4863706 (1989-09-01), Wada et al.
patent: 4927560 (1990-05-01), Osaka et al.
patent: 5004039 (1991-04-01), Feagin
patent: 5004711 (1991-04-01), Grodek
Hata Kazuo
Moto Teruyuki
Osaka Shigemi
Takahashi Tsukawa
Group Karl
Nippon Shokubai Kagaku Kogyo & Co., Ltd.
Wright A.
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