Improvement of tribological properties of titanium by DMGN

Abstract

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.