Sintering material containing silver-tin oxide for electrical contacts and process for its manufacture

US5798468A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Wolfgang Weise · Frankfurt, DE
• Roger Wolmer · Gelnhausen, DE
• Peter Braumann · Alzenau, DE

Key dates

• Filing date: Jan 31, 1996
• Grant date: Aug 25, 1998
• Expiry date: Jan 31, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C32/0021
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An electrical contact material for switching rated currents between 20 and 100 Ampere having improved operational life made of 3.2 to 19.9 wt-% tin oxide and 0.05 to 0.4 wt-%, in each case, of indium oxide and bismuth oxide, the remainder being silver. In the course of the manufacture of the material by powder metallurgy more than 60 wt-% of the tin oxide should exhibit a particle size of more than 1 .mu.m.