Patent ID: 6551658
Filing Date: 2003-04-22
Classification: C23C,Y10T

Abstract:
A process for producing a plurality of metal oxide coated three dimensional particle substrates comprising: forming a liquid slurry reaction mixture by contacting said particle substrates which include external surfaces and shielded surfaces which are at least partially shielded by other portions of said substrate with a composition comprising a precipitated metal oxide forming compound, contacting said mixture at fast reaction oxidizing and elevated temperature conditions in a reaction zone in the presence of an oxidizing agent effective to form a metal oxide coating on at least a portion of the surfaces of said three dimensional substrate including at least a portion of the shielded surfaces of said particles at said conditions and without substantially adversely effecting the solid integrity of the substrate; said fast reaction oxidizing conditions in said zone including an average particle residence time of less than about one second when at fast reaction oxidizing elevated temperature conditions, which temperature is maintained by a thermal source which does not substantially adversely contribute deleterious contaminants to the metal oxide coating and recovering a plurality of metal oxide coated three dimensional particle substrates.