Abstract
In this paper, MoSi2 and its composites were fabricated by hot pressing method. The roles of the second phase as mechanical and tribological components were studied. The results showed that B4C and ZrO2 particulates could be used for the strengthening and toughening of MoSi2 respectively. The tribological behaviors of MoSi2 and its composites sliding against Ni–Cr alloy and Ni–Cr–S alloy at room temperature and 600 °C were investigated on a tribometer with a pin-on-disk configuration. MoSi2–SiC exhibited the best tribological performance. The wear behaviors of MoSi2 and its composites were well correlated with their toughening mechanisms in sliding against Ni–Cr alloy at room temperature. Due to the introduction of chromium sulfides, the formation and removal process of the transferred layers at 600 °C controlled the wear mechanism of MoSi2 and its composites. The tribo-oxidation was an important factor favorable to wear reduction.
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