Ta系およびW系アモルファス合金の摩擦・摩耗

概要

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Ta- and W-amorphous alloys, which are fabricated by the PVD method, have been rubbed against 8 pure metals (Ni, Fe, Ta, Cu, Al, Mg, Ti, W) in 1.0 × 10^5 Pa dry air and in 1.5 × 10^<-3> Pa vacuum. In vacuum, when rubbed against Ni, Fe and Ta, Ta-amorphous alloy is worn out much more than when it is rubbed against other metals. This is thought to be due to the high adhesivity between metals and amorphous alloy, because Ta-amorphous alloy contains mating metal (Ni, Fe, Ta) as a component. In all the rubbing systems, the coefficient of friction is higher in air than in vacuum. Rubbed against Cu or Mg, the amount of transfer of Cu or Mg onto the amorphous alloy surface is much greater in air than in vacuum. Oxygen atoms coexist with Cu or Mg atoms on the surface of amorphous alloy. From these results, it is deduced that atmospheric oxygen increases the adhesivity between metals and amorphous alloy, which enhances the transfer of metal onto amorphous alloy.
1993-02-25