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

摘要

PURPOSE: To produce a metal foil excellent in lead deformation resisting- characteristic and heat resisting strength characteristic as a lead foil for TAB. ;CONSTITUTION: An alloy having a composition consisting of, by weight, 20-95% Cu, 0.3-11% Al, 0.05-3.0% Mn, 0.005-3.5% Ti, 0.5-10% Cr, 0.001-1.5% Mo, and the balance Fe with inevitable impurities is melted and cast, which is hot-rolled at 700-1000°C into a metal plate of 1.0-8mm plate thickness. This metal plate is subjected to primary cold rolling at 50-95% draft, to annealing at 800-1000°C, and then to secondary cold rolling at 1-70% draft. The resulting sheet is further subjected to solution heat treatment at 700-1000°C, to rapid cooling, and successively to aging treatment at 350-650°C. By this method, the metal foil wherein the aspect ratio of crystalline grain size and sheet thickness are regulated to ≤20 and ≤80μm, respectively, can be produced.;COPYRIGHT: (C)1994,JPO&Japio