Method for formation of thermal-spray coating layer of rare earth fluoride
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsKazuhiro Wataya, Takao Maeda
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Abstract
The invention discloses a material and an efficient method for the formation of a thermal-spray coating layer of a rare earth fluoride by a process of thermal-spray coating by using a unique thermal spray powder consisting of granules of the rare earth fluoride having a specified average particle diameter. The thermal-spray granules are prepared by granulating primary particles of the rare earth fluoride having a specified average particle diameter from an aqueous slurry containing a binder resin and subjecting the granules to a calcination treatment at a temperature not higher than 600° C.
Claims10
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 μm 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 μm;
- (b) subjecting the granules of the rare earth fluoride to a calcination treatment in air at a temperature not exceeding 600° 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.
A thermal-spray coating material which comprises granules of a rare earth fluoride having an average particle diameter in the range from 20 μum to 200 μm. the granules being formed from primary particles of the rare earth fluoride having have an average particle diameter not exceeding 10 μm.
Dependencies are inferred from the claim text.