SURFACE COATING OF HIGH-POWER FERREED CONTACTS (ALTERNATIVES) Russian patent published in 2003 - IPC

FIELD: electrical engineering; coatings for effective parts of high-power hermetically sealed contact members. SUBSTANCE: according to first alternative contact coating has cobalt-tungsten alloy, 1 to 10 mcm thick, produced by electric deposition, with tungsten content of 5 to 50 mass percent, and surface layer of nickel-boron alloy, 0.05-0.5 mcm thick, with boron content of 0.1 to 1.2 mass percent. According to second alternative surface coating has copper layer, 1 to 20 mcm thick, cobalt-tungsten alloy layer, 1 to 10 mcm thick, produced by electric deposition, with tungsten content of 5 to 50 mass percent, and surface layer of nickel-boron alloy, 0.05 to 0.5 mcm thick, with boron content of 0.1 to 1.2 mass percent. EFFECT: enhanced service life and reduced cost due to dispensing with noble metals. 2 cl, 1 tbl