Zirconia sol, method for production thereof, porous ceramic-producing slurry, and porous ceramic product obtained by use thereof
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United States of America Patent
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Jan 4, 1994
Issued Date -
N/A
app pub date -
Nov 13, 1992
filing date -
Feb 10, 1989
priority date (Note) -
Expired
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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.
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