| 摘要 |
PURPOSE:To obtain a lead frame excellent in conductivity and tensile strength, by coating at least one side surface of an amorphous alloy foil with Cu or Cu alloy. CONSTITUTION:Single surface or both surfaces of amorphous alloy 1 are coated with Cu or Cu alloy 1 and made composite. By making composite material of amorphous alloy and Cu, the following defects can be improved while superior characteristics of amorphous alloy are maintained; low conductivity, durability for repeated bending, blanking property, and soldering property. Suitable thickness of amorphous alloy is 20-50mum. In the case of thickness less than or equal to 20mum, the strength and toughness are not sufficient. In the case of thickness more than 50mum, the alloy becomes fragile. The thickness of Cu or Cu alloy for making composite is 2-20mum. From economical view-point, Fe-base alloy is desirable for the composition of amorphous alloy.
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