Abstract:To study the friction and wear properties of CuNi6Sn6 alloy under high-temperature and high-load working condition, an MMU-10G friction-abrasion testing machine was used for experiments, and a LEXT OLS5000 3D confocal laser scanning microscope was utilized to examine the worn surface morphology for determination of wear mechanisms. Under a load of 45 N, friction coefficient of the alloy increased and then decreased with rising ambient temperature. Under a higher load of 75 N, friction coefficient remained relatively stable when ambient temperature was below 150 ℃, but fluctuated significantly at 200 ℃. When the load was increased to 105 N, friction coefficient was only stable below 100 ℃. When ambient temperature was below 150 ℃, wear mass increased with the load. While at 200 ℃, wear mass was relatively large. At lower ambient temperatures, wear mechanism was mainly abrasive wear. As the load increased, it manifested as fatigue pitting and fatigue delamination. Under medium-high temperatures and low loads, adhesive wear predominated; under high temperature and high load, severe plastic deformation and surface burn occurred. When ambient temperature exceeded 150 ℃, wear severity increased. Therefore, CuNi6Sn6 alloy was suitable for service conditions with ambient temperatures below 150 ℃ and loads below 75 N.