Effects of Additives on the Contact Performance Parameters for Silver-Nickel Contact

摘要

A comparative study of electrical, mechanical, and microstructure properties of silver-nickel contact materials (85 volume percent Ag) mixed by two different additives, namely tungsten (W) and tungsten oxide (WO3), were analyzed.Even with the same additive content, additive article size and distribution, the two different additives of silver-nickel contact materials have resulted in no difference in microstructure, electrical conductivities, tensile strength and elongation, minor differences in hardness and electrical contact resistance, and significant differences in material transfer and arc erosion properties.The addition of tungsten to silver-nickel 85/15 reduced the appearance possibility of maximum weld strength.Material loss due to arc erosion was less for 1.5％ tungsten addition than for the 1.5％ tungsten oxide addition.This seemed to be a result of the greater arc intensity with tungsten oxide addition.The formation of large nickel particles were microstructure changes observed near the tungsten oxide additive of contact surfaces as a result of the arcing.The additives may influence the extent to which these transformations had occurred.