729756.fig.003
Figure 3: Dependence of surface roughness of wear track (Ra) in pure UHMWPE (1), nanocomposites UHMWPE +0.1 (2), 0.5 (3), 1 (4), 2(5) wt.% HA and microcomposites UHMWPE +5 (6), 10 (7), 20 (8), 40 (9) wt.% HA at the steady-state wearing stage.