FE-NI ALLOY FOR LEAD FRAME AND ITS PRODUCTION

• Main Authors: TAKEMOTO TOSHIHIKO, FUJINO TSUTOMU, YAMAZAKI KAZUNOBU
• Format: Patent
• Language: English
• Published: 19.04.1994
• Edition: 5
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SEMICONDUCTOR DEVICES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PURPOSE:To obtain an Fe-Ni alloy for lead frame showing superior plating suitability and solder-wettability even if activation pretreatment is omitted. CONSTITUTION:This alloy is an Fe-Ni alloy which contains, by weight, <=0.05% C, <=0.5% Si, <=1.0% Mn, <=1.0% Cr, 25-50% Ni, and <=0.03% N and where B content is limited to <=0.002%. Further, Si concentration in a surface film is controlled to <=5 atomic % in this alloy. This Fe-Ni alloy is finish-annealed in a reducing atmosphere at >=890 deg.C after cold-rolling so that Si concentration in the surface film becomes <=5 atomic %.