초록 ▼

Zirconia toughened alumina (ZTA) is produced from precursor salts. The precursor salts are coprecipitated from solution to yield a gel in a liquid phase. The gel in excess of the critical temperature and pressure is dried at a temperature and pressure in excess of the critical temperature and pressu

Zirconia toughened alumina (ZTA) is produced from precursor salts. The precursor salts are coprecipitated from solution to yield a gel in a liquid phase. The gel in excess of the critical temperature and pressure is dried at a temperature and pressure in excess of the critical temperature and pressure of the liquid phase to thereby convert the liquid phase to a gas. The solid particles, when separated from the gas, form a fine particulate ZTA which, upon consolidation yields near theoretical density toughened ceramics.

대표청구항 ▼

A process for producing zirconia toughened alumina, comprising the steps of: mixing an admixture of a major amount of an aluminum salt and a minor amount of a zirconium salt with a precipitating base to coprecipitate the hydrous oxides of zirconia and alumina, forming a gel in a liquid phase, drying

A process for producing zirconia toughened alumina, comprising the steps of: mixing an admixture of a major amount of an aluminum salt and a minor amount of a zirconium salt with a precipitating base to coprecipitate the hydrous oxides of zirconia and alumina, forming a gel in a liquid phase, drying said gel by heating and pressurizing the gel above the critical temperature and pressure of the liquid phase to thereby convert the liquid phase to gas, separating the solid particles from the gas and consolidating the solid particles.