Hardened Fe-Ni alloy for the manufacture of integrated circuit leaderframes and manufacturing process

US6692992B1 · kind B1 · utility

Assignee

• Imphy Ugine Precision · FR

Inventors

• Ricardo Cozar · Ris-Orangis, FR
• Pierre-Louis Reydet · Gimouille, FR

Key dates

• Filing date: Nov 26, 2002
• Grant date: Feb 17, 2004
• Expiry date: Nov 26, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2924/0002
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method of making a Fe-Ni strip whose chemical composition comprises, by weight: 36% ≦Ni+Co≦43%; 0%≦Co≦3%; 0.05%≦C≦0.4%; 0.2%≦Cr≦1.5%; 0.4%≦Mo≦3%; Cu≦3%; Si≦0.3%, Mn≦0.3%; the rest being iron and impurities, the alloy having an elastic limit Rp0.2 more than 750 Mpa and a distributed elongation Ar more than 5%. The alloy is optionally recast under slag. The strip is obtained by hot-rolling above 950° C., then cold-rolling and carrying out a hardening treatment between 450° C. and 850° C., the hardening heat treatment being preceded by a reduction of at least 40%. The invention is useful for making integrated circuit support grids and electronic gun grids.