JPH05287473

• Main Author: EGUCHI TATSUO
• Format: Patent
• Language: English
• Published: 02.11.1993
• Edition: 5
• Subjects: ALLOYS; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

PURPOSE:To provide the method for manufacturing a silver thin sheet used as an electrical contact material or the like. CONSTITUTION:A silver ingot constituted of 20 to 100ppm Cu, and the balance Ag with inevitable impurities is prepd. This silver ingot is subjected to cold rolling to manufacture a silver thin sheet. At this time, the silver ingot or silver sheet in the process of the cold rolling is heated to 550 to 900 deg.C. The heated silver ingot or silver sheet is cooled by water. In particular, the draft in the cold rolling is preferably regulated to 50 to 95%. Even if the silver thin sheet immediately after the manufacture or after being allowed to stand for a long term is exposed to a high temp. of about >=2800 deg.C, the coarsening of the crystalline grains in the silver thin sheet is hard to generate. Thus, by using this silver thin sheet, the effects that cracks on the silver thin sheet are difficult to generate and roughening on its surface is hard to generate even if being exposed to a high temp. are given. Furthermore, the effects that the softening of the silver thin sheet is difficult to generate and the deterioration in its quality is small even if being allowed to stand for a long term after the manufacture are obtained.