A new microgeared-motor assembled by Ni-based metallic glasses (MGs) bearing was constructed. The durability of the microgeared-motor improved about 4 times longer than that of the microgeared-motor assembled by the sintered alloy bearing. As compared with that of the sintered alloy bearing, higher hardness of Ni-based MG encourages excellent wear resistance of bearing. In order to clarify the relation between hardness and wear resistance of MG bearings, we conducted wear tests for the conventional sintered alloy, Zr-, Ni-, and Fe-based MG bearings. As a result, it was found that the worn loss in volume were 2.7%, 1.8%, 0.2% and 0.0% for the sintered alloy, Zr-based MG, Ni-based MG and Fe-based MG, respectively. This result suggests that the wear resistance of bearings is mainly dominated by hardness. The wear mechanism of MG bearing will be also discussed.
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