SEMIFINISHED PRODUCT FOR ELECTRICAL CONTACTS, MADE OF A COMPOSITE MATERIAL BASED ON SILVER AND TIN OXIDE, AND POWDER METALLURGICAL PROCESS FOR PRODUCING IT

摘要

PCT No. PCT/EP89/00316 Sec. 371 Date Sep. 17, 1990 Sec. 102(e) Date Sep. 17, 1990 PCT Filed Mar. 22, 1989 PCT Pub. No. WO89/09478 PCT Pub. Date Oct. 5, 1989.A semifinished product for electric contact made from a composite material based on silver-tin oxide is described as well as a powder-metallurgical process of making said product. The structure of the semifinished products contains regions which contain no metal oxide or very little metal oxide in alternation with regions which contain the entire metal oxide component or a greatly predominating/share thereof in a fine division.