| 摘要 |
PURPOSE:To cast an ingot having good quality, by plating specific metal on the inside surface of a casting mold made of copper and further forming the melt sprayed film of a self-fluxing alloy thereon then subjecting the film to a remelting treatment, thereby protecting the surface of the casting mold against damage and deformation over a long period of time. CONSTITUTION:Plating 2 of nickel, iron, cobalt or their alloy is applied on part or the whole of the inside wall surface of a water-cooled casting mold 1 made of a blank material of deoxidized copper or precititation hardening type copper alloy. A melt sprayed film 3 of a self-fluxing alloy is then formed thereon. The film 3 is further subjected to a remelting treatment with a beam or an arc heat source which is moved without any thermal influence on the base material of the mold 1. The self-fluxing alloy is produced by adding MO, WC, TiO2, etc. properly to the essential components of Ni-Cr-B-Si according to characteristics, and an electron beam or the like generated by converging about >=2,000 Joule/ cm<2> energy to within about 10mm. diameter is used as the heat source to be used for the remelting. |
