Stabilized zirconia a process for its preparation and its application in ceramic compositions
AssigneeRhone-Poulenc Specialites Chimiques
InventorsJean-Francois Colombet, Claude Magnier
Life of this patent
Estimating the term…
Abstract
A fine powder of stabilized zirconia a process for its preparation and application of the powder in ceramic compositions to obtain good mechanical, thermomechanical and electrical properties. A zirconia hydrate sol having a pH between 0.5 and 5 and containing elementary acicular crystals having dimensions of from about 10 to 500 .ANG. which are agglomerated into submicron aggregates of from abuot 100 to 5000 .ANG. in diameter is mixed with a solution of a stabilizing agent, preferably yttrium; the suspension is dried; the dried suspension is calcined at a temperature of from about 700.degree. C. to 1,300.degree. C. for preferably from about 30 minutes to 24 hours; and if needed, the powder obtained is milled.
Claims13
A process for preparing a fine powder of stabilized zirconia, comprising the steps of forming a suspension containing particles by mixing a zirconia hydrate sol having a pH of from about 0.5 to 5 and containing elementary acicular crystals of ZrO.sub.2 having dimensions from about 10 to 500 .ANG., which crystals are agglomerated into submicron aggregates of ZrO.sub.2 having dimensions from about 100 to 5,000 .ANG. in diameter with a solution having a concentration of a stabilizing agent;
- drying said suspension to obtain a dried product;
- and calcining the dried product at a temperature of from about 700.degree. C. to about 1,300.degree. C. to obtain said powder of stabilized zirconia.
Dependencies are inferred from the claim text.