| 摘要 |
PURPOSE:To restrict the thermal deformation of a metal base plate, and prevent each layer of the metal base plate, a bonded insulating layer, and a metal foil from exfoliating with each other, by using the metal base plate wherein a reinforcing sheet is fixed to a metal plate as a base member and unified in a body, said reinforcing sheet being formed by arranging in parallel two metal band members having mutually different thermal expansion coefficients, and welding the end-portion junction parts, which are unified in a body. CONSTITUTION:By laser beam welding and the like, a first metal band member 5 and a second metal band member 7 are joined in the form of a plane with a metal base plate 4 in which a reinforcing sheet 5 is welded around a metal plate by spot welding and the like. For the first metal band member 6, nickel chromium steel band (thermal expansion coefficient 17X10<-6>) is used, which is composed of, e.g., 18wt.% chromium, 8wt.% nickel and iron of residual percent. For the second metal band member 7, invar (thermal expansion coefficient 1X10<-6>) is used, which is composed of, e.g., 36wt.% nickel and 64wt.% iron. On the metal base plate 4, a metal foil 3 is stacked via a bonded insulating layer 2, and subjected to pressing and heating to be formed in a body. |
