EFFECTS OF LOADS ON HIGH-TEMPERATURE FRICTION-WEAR PROPERTIES OF CATHODIC ARC ION PLATED TiALSiN COATINGS

Abstract

A TiAlSiN coating was deposited on H13 hot work mould steel using a cathodic arc ion plating (CAIP). The friction-wear performances of the obtained coating under different loads were characterized on an HT-1000 type high temperature tribological tester at 800[Formula: see text]C. The morphologies and chemical compositions of the worn tracks were analyzed using a scanning electronic microscope (SEM) and its configured energy dispersive spectrometer (EDS), respectively, and the corresponding wear mechanisms were discussed. The results show that the average coefficient of friction (COF) of the TiAlSiN coating at the loads of 2, 4 and 6[Formula: see text]N is 0.3072, 0.3040, and 0.4114, respectively, the COFs of the coating are stable at the loads of 2 and 4[Formula: see text]N, while those at the load of 6[Formula: see text]N are obviously increased. Under the load of 2[Formula: see text]N, a small amount of large and scattered white debris disperses on the worn track, the wear mechanism is adhesive wear. While the white wear debris appears on the worn track under the load of 4[Formula: see text]N, the COFs are relatively stable, due to the effects of oxide layer on the worn track, and the wear mechanism is abrasive wear and oxidation wear. Under the load of 6[Formula: see text]N, a number of shallow grooves and cracks appear on the worn tracks, showing that the coating is basically worn out, the wear mechanism is abrasive wear and oxidation wear.