| 摘要 |
PURPOSE:To produce a molybdenum tray for high-temp. sintering in which the occurrence of adhesion is prevented by successively forming an undercoat layer of molybdenum and a surface layer of ceramics on the surface of a molybdenum base material by a plasma spraying method and then burning the resulting coating layer at high temp. CONSTITUTION:A tray is formed by using a base material of molybdenum or molybdenum-base alloy. As this molybdenum-base alloy, e.g. the one prepared by adding SiO2, K2O, Al2O3, etc., to molybdenum is used. Further, this base material is prepared by the ordinary powder metallurgical method. Subsequently, an undercoat layer enriched in molybdenum and, on the above, a surface layer enriched in heat resisting ceramics are successively formed on the surface of the above base material by means of plasma spraying. The resulting coating layer is burnt at a temp. as high as >=1500 deg.C to improve adhesive strength. The tray obtained by this method causes neither adhesion between mutual trays nor adhesion to other members even if used in a piled state for sintering nuclear reactor fuel, etc., at about 1700-1750 deg.C. |
