| 摘要 |
PURPOSE:To obtain an alloy for a lead frame having a low coefft. of thermal expansion and stable thermal expansion characteristics and causing hardly martensitic transformation by limiting a composition consisting of Ni, Co and Fe. CONSTITUTION:This alloy for a lead frame consists of >30-34% Ni, 8-13% Co and the balance essentially Fe. The alloy is a low expansion alloy having <=4.5X10<6>/ deg.C average coefft. of thermal expansion in the temp. range of 30-350 deg.C and <=-55 deg.C martensitic transformation start temp. (Ms point). It is preferable that the Ni+Co content in the alloy is regulated to >= aboaut 41% from the viewpoint of matching with sealing glass in thermal expansion. |
