Fretting wear of sintered iron under low normal pressure

Fretting wear of sintered irons of relative density 80%, 85% and 90% under a low normal pressure of 2 MPa has been investigated. Wear was generated in air, with no lubrication, between test-pieces of the same density. The nom inal contact area was (100 mm)(2), normal load was 200 N and average slidin g speed was 0.01 ms(-1). Three different peak-to-peak sliding strokes, 0.05 mm, 0.2 mm and 0.5 mm were used with the corresponding total number of sli ding cycles of 10(6), 2.5 x 10(5) and 10(5) respectively. All the three mat erials gained mass but lost volume under all test conditions. Both mass gai ns and volume losses decreased with increasing density, but increased with increasing stroke. Mass and volume changes can be interpreted by a model in volving packing of debris into surface breaking pores. Density had no signi ficant effect on friction coefficient. Higher friction coefficients always coincide with higher frequency and lower sliding stroke even though the amo unt of wear changed in the opposite sense. (C) 1998 Elsevier Science S.A. A ll rights reserved.