Micro-Tribological Performance of MoS2 Lubricants with Varying Au Content.

摘要

Microtribological testing with a spherical diamond tip {radius = 100 pm) was conducted on two AU-M0S2 coatings with 32 at.% and 84 at.% Au. For lower loads (0.2 to 2.0 mN), the performance of both coatings was similar, with minimal wear (<50 nm depth) and relatively stable friction coefficients. At higher loads (3,0- 5.0 mN), similar trends were found for the 84 at.% Au specimen, but the 32 at,% Au sample wore severely and the friction became unstable. Non-linear curve fitting of friction coefficient versus normal load was conducted using a model containing an elastic (Hertzian) term and a plastic (plowing) term. Changes in the two contributions to the friction with time were used to explain the differences in performance observed between the two coatings,