METALLIC FOIL FOR TAB TAPE HAVING HIGH YOUNG'S MODULUS AND HIGH YIELD STRENGTH AND ITS PRODUCTION

摘要

PURPOSE: To produce a metallic foil having superior lead deformation resistance and heat resisting strength characteristics required of lead foil for TAB. ;CONSTITUTION: A molten metal having a composition consisting of, by weight, 20-95% Cu, 0.0005-1.0% Co, 0.005-3.5% Ti, 0.5-10% Cr, 0.001-1.5% Mo, and the balance Fe with inevitable impurities is cast into a metal plate of 0.5-8mm plate thickness at (100 to 50000)°C/sec solidification and cooling rate. This metal plate is subjected to primary cold rolling at 50-95% draft, to annealing at 800-1000°C, to secondary cold rolling at 5-70% draft, and successively to aging treatment at 350-650°C, by which the aspect ratio of crystalline grain size and sheet thickness are regulated to ≤20 and ≤80μm, respectively. By this method, the metallic foil minimal in anisotropy of characteristics, excellent in lead deformation resistance and heat resistance, and having high Young's modulus and high yield strength can be provided.;COPYRIGHT: (C)1994,JPO&Japio