| 摘要 |
PURPOSE:To obtain the titled frame with high heat-dissipation property excellent in bondability with Au wires, hardness, bendability, oxidation-resistance, and solderability, by cladding both surfaces of a plate of Fe alloy with a thin plate of Cu or Cu alloy. CONSTITUTION:Both surfaces of a plate of 42 alloy or kovar are clad with a precipitation hardening type Cu alloy to a thickness of 20mum or more. This Cu alloy can be obtained by melting Cu containing Cr 0.1-1wt% and Zr 0.05- 0.5wt% at 400-500 deg.C, casting it continuously, hot-rolling and cold-rolling it, heat- treating it to melt, then cold-working it, and hardening it to deposit. Thereafter, the lead frame is produced by forming to a required shape. This construction can yield the lead frame excellent in various kind of characteristics such as bendability and the like. |
