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Tribological of 99.70% titanium was improved in ammonia at 1000, 1050 and 1100 oC for 2, 6 and 10 h by direct metal-gas nitridation (DMGN). The flow rate of ammonia was set constantly at 10 cm3 s-1. By using an X-ray diffractometer (XRD) and an energy dispersive X-ray (EDX) analyzer, TiN and Ti2N phases with the corresponding elements were detected. Vicker hardness (HV) of the sample was at the highest and pin-on-disk tribological test shown lowest of friction coefficient when it was processed at 1100 oC for 10 h. Formation of TiN, Ti2N, could improve surface hardness and reduce friction coefficient leading to improve wear resistance of the 99.70% titanium.
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