Patent ID: 7288324
Filing Date: 2007-10-30
Classification: B82Y,C01G,C01P,C03C,C04B,Y10T

Abstract:
1. Monodispersed, spherical zirconia (ZrO 2 ) particles of approximately 10 to approximately 600 nm, pure and free of foreign oxides exhibiting metastable tetragonal crystal structure at room temperature are produced by a sol-gel process comprising the steps of: a) mixing zirconium-alkoxide and an alcohol, forming preparation one; b) separately dissolving completely de-ionized water and a polymeric steric stabilizer in an alcohol forming preparation two; c) mixing the preparation one and the preparation two for approximately a few minutes while subjecting the mixture to hydrolysis and condensation reactions with very slow stirring; d) waiting for the formation of a sol from the mixture; e) drying at approximately 80 degrees C. to form resultant material; f) crushing the resultant material; and g) forming spherical zirconia (ZrO