Effects of nickel addition on properties of Ag-W electrical contact materials

Aslanoğlu Z., Karakaş Y., Ovecoglu M. L. , Ozkal B.

POWDER METALLURGY, cilt.44, sa.1, ss.77-81, 2001 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 44 Konu: 1
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1179/003258901666202
  • Sayfa Sayıları: ss.77-81


Tungsten and silver powders doped with small amounts of nickel were milled in a heavy duty attritor For 150 min to constitute the W-35 wt-%Ap composition. Milled powders were compacted, sintered, furnace cooled, and re-sintered using industrial conditions. Scanning electron microscopy (SEM) investigations revealed homogeneous dispersions of silver and tungsten regions both in the as milled powders and the as milled compacts. The X-ray results taken from the milled powders and the as milled compacts showed the presence of the characteristic W and Ag peaks. Bulk hardness values of the sintered compacts increased with increases in nickel additions. the are erosion characteristics of the W-35 wt-%Ag compacts indicated that the erosion rate of the contact material declined with nickel additions. Contact life expectancy increases about 10 fold for the W-35 Wt-%Ag compact containing 1 wt-%Ni from the one with no Ni content.