| 摘要 |
PURPOSE:To obtain a base material capable of holding initial performance for a long period of time by a method wherein a NI-Mg alloy having the predetermined mixture ratio of the elements is sandwiched as a central material between sandwich-materials and all of these materials are uniformly coated with a solvent in which Ni powder has been dispersed, before being heated and combined together. CONSTITUTION:A Ni-15-30%W alloy containing no reducing agents is processed through cold working and the like to prepare a core alloy 7 as a sandwich- material and subsequently a Ni-0.1-2.0%Mg alloy 4 is cast in a mold to prepare a central material. Each of the Ni-Mg alloy 4 and core alloy 7 is uniformly coated, using a brush, with Ni paste 2 prepared by dispersing, for instance, Ni powder having a grain diameter of 1-50u in a solvent of nitrocellulose and the like and these alloys are piled up, before being heated by hydrogen or inert gas and the like to combine them together. Then the materials on either side of the combination at a right angle to the direction in which it has been roll-reduced are welded together. In so doing, it becomes possible to obtain an excellent base material capable of holding initial performance for a long period of time. |
