| 摘要 |
PURPOSE:To attain good Young's modulus, yield strength, conductivity and high etching factor by setting the etching factor at a specified value or above for a specified pin interval of lead frame. CONSTITUTION:The two-phase alloy of Fe-Cu has a chemical composition of 20-60wt.% of Cu, 0.1-10wt.% of Cr, 0.005-3.5wt.% of Ti, 0.001-1.5wt.% of Zr, 0.001-1.1wt.% of Al, 0.001-1.5wt.% of Mo, and the remainder of Fe and inevitable impurities. The etching factor is set at 2.3 or above when the pin interval of lead frame is 100mum. This method produces an IC lead frame of Fe-Cu alloy having high stiffness, electric conductivity of 10% or above, etching factor of 2.3 or above, and the corner part excellent in linearity and smoothness. |
