表面改性提高与Ti6A14V对磨材料UHMWPE摩擦学性能

Surface engineering has been emerging as one of the most promising technologies to improve the tribological properties of biomaterials with a view to extending the life span of medical implants. For example, some novel surface engineering techniques including ion implantation of ultra-high molecular weight polyethylene (UHMWPE) and thermal oxidation (TO) treatment of titanium alloy have been developed. However, the full potential of improving the wear resistance of orthopaedic implants based on the UHMWPE/ Ti6A14V system will not be realized until the tribological performance of this surface engineered tribo-system is fully characterized and the acting wear mechanisms are well understood. In this paper, a pin-on-disc tribometer was employed to evaluate the tribological response of the following three tribo-systems: (1) untreated UHMWPE/untreated Ti6A14V. (2) untreated UHMWPE/TO-treated Ti6A14V and (3) ion implanted UHMWPE/TO treated Ti6A14V under water lubricated conditions. Experimental results show that the tribological properties of UHMWPE can be significantly increased by surface enghmering its surface and/or the counterface. Tiffs can be attributed to the hardened surface of UHMWPE via molecular structure modification induced by ion bean bombardment coupled with the surface oxide layer on Ti6A14V formed during TO treatment, which has favorable tribological compatibility with UHMWPE.

Improvement in the tribological properties of UHMWPE sliding against Ti6Al4V by surface modification

Surface engineering has been emerging as one of the most promising techn ologies to improve the tribological properties of biomaterials with a view to ex tending the life span of medical implants. For example, some novel surface engineering t echniques including ion implantation of ultra-high molecular weight polyethylen e (UHMWPE) and thermal oxidation (TO) treatment of titanium alloy have been devel oped. However, the full potential of improving the wear resistance of orthopaedi c implants based on the UHMWPE/ Ti6Al4V system will not be realized until the tr ibological performance of this surface engineered tribo-system is fully charact e rized and the acting wear mechanisms are well understood. In this paper, a pin- o n-disc tribometer was employed to evaluate the tribological response of the fol l owing three tribo-systems: (1) untreated UHMWPE/untreated Ti6Al4V, (2) untreate d UHMWPE/TO-treated Ti6Al4V and (3) ion implanted UHMWPE/TO treated Ti6Al4V unde r water lubricated conditions. Experimental results show that the tribological pr operties of UHMWPE can be significantly increased by surface engineering its sur face and/or the counterface. This can be attributed to the hardened surface of U HMWPE via molecular structure modification induced by ion bean bombardment c oupl ed with the surface oxide layer on Ti6Al4V formed during TO treatment, which has favorable tribological compatibility with UHMWPE.