Patent ID: 6685991
Filing Date: 2004-02-03
Classification: C01F,C01P,C23C

Abstract:
A method for the formation of a thermal-spray coating layer of a rare earth fluoride on a substrate surface which comprises the steps of:(a) granulating primary particles of a rare earth fluoride having an average particle diameter not exceeding 10 &mgr;m from an aqueous slurry thereof to give granules of the primary particles of a globular particle configuration having an average particle diameter in the range from 20 to 200 &mgr;m; (b) subjecting the granules of the rare earth fluoride to a calcination treatment in air at a temperature not exceeding 600Â° C.; and (c) spraying the calcined granules of the rare earth fluoride at the surface of a substrate body as being carried by a flame so as to deposit a melt of the rare earth fluoride on the surface of the substrate.