The Fundamental Research On Surface Modification Of Pure Titanium And Titanium Alloy Using Plasma Ion Implantation And Multi-arc Ion Plating

TO improve the wear resistance, anticorrosion and microhardness by treating the surface of pure titanium and Ti6A14V using plasma ion implantation and multi-arc ion plating techniques.Nitrogen was implanted into the surface of pure titanium and Ti6A14V using plasma ion implantation. The implanted layer was analyzed by X-ray diffraction and X-ray photoelectron spectroscopy. The wear resistance of the treated samples was evaluated with micro-hardness tester and in ball-on-disk tests. Their anticorrosive property was assessed in electro-chemical method and by the samples' release rate of titanium ion in the artificial saliva. Over the implanted layer, TiN coating was deposited by multi-arc ion plating and the surface components of the TiN layer thereby formed were analyzed by X-ray diffraction and X-ray photoelectron spectroscopy. Scratching method was utilized to measure the coalescent force of film-substrate. The wear resistance of the modified samples was evaluated in ball-on-disk tests, their microhardness tested using microhardness testers and their anticorrosive property assessed by electro-chemical method in addition to the samples'release rate of titanium ion in the artificial saliva.The samples modified by plasma ion implantation was light golden in color. X-ray diffraction and X-ray photoelectron spectroscopy detected TiN in the implanted layer, which was generally composed of TiN and Ti₄N_2.33 and the composition in different substrates varied. The modified samples demonstrated increase in microhardness and wear resistance. However, the increase was not considerable due to the thin layer. The electric potential of corrosion (Ecorr) of pure Titanium and Ti6A14V measured by electric-chemical method increased by 0.44V and 0.4V after modification, respectively. The two samples' Ip declined significantly. After immersion in artificial saliva for 90 days, the modified samples showed lower release rate of Titanium ion. The TiN coating formed by multi-arc ion plating was golden in color, which was mainly composed of TiN and had good coalescent force of film-substrate. The coating gained the microhardness that was 7.7 times that of pure titanium and 4.3 times that of Ti6A14V, showed significantly smaller wear width in ball-on-disk tests and increased electric potential of corrosion.Plasma ion implantation and multi-arc ion plating improves the wear resistance and anticorrosive property of pure titanium and Ti6A14V. On the implanted layer, which is critically thin, TiN coating is deposited by multi-arc ion plating to substantially raise the wear resistance and anticorrosion of pure titanium and Ti6A14V.