| Titanium alloys such as Ti6Al4V are widely applied to biologicalmaterial due to its excellent comprehensive performance. However, theyhave poor wear resistance and no antibacterial resistance properties,which could cause infection and disease or surgery failure. Therefore, inorder to improve the comprehensive performance of titanium alloys,Ti-Ag and Ti-Ag-N films were deposited on Ti6Al4V substrates, usingcomposed Ti-Ag targets by magnetron sputtering method. Themicrostructure, phase composition, chemical composition, surfacemorphology and cross section morphology of thin films were measuredand characterized. It was researched and compared that the antibacterial,friction and wear properties of substrate material and Ti-Ag-(N) films.The antibacterial and the tribological mechanism were also discussed.The conclusions are as follows:(1) Uniform and dense modified layers have been prepared onTi6Al4V surface by magnetron reactive sputtering technology. The Ti-Ag and Ti-Ag-N composite films have different Ag contents and differentroughness, which are obtained by same Ti-Ag alloy target. But they havethe same thickness. TiN is formed in the Ti-Ag-(N) films.(2) The antibacterial properties and antibacterial mechanism of thefilms have been analyzed and studied. S1, S2, S3and S4haveantibacterial properties against Escherichia coli because of the presenceof Ag in the films. With the contacting time increasing, the antibacterialrate increase. The antibacterial rates of S1and S4sample films are85%and88%respectively, while those of the S2, S3sample films are over99%. The antibacterial properties of S2, S3and S4are superior to thesample S1.(3) The friction and wear properties of the Ti-Ag-(N) films havebeen detected and analyzed. Under dry friction conditions, corundum ballis used as friction pair. The friction coefficients of the films are slightlylower than that of the base. Therefore, the films have almost noanti-friction effect. The wear volumes and wear rates of the films arelower than that of the substrate. The Ti-Ag-(N) films improve the wearresistance of Ti6Al4V. Sample S2shows better wear-resistingperformance than others. And Ti-Ag-N film has better wear-resistingperformance than the Ti-Ag films. The wear mechanisms of substrate, S1,and S3samples are mainly abrasive wear, adhesion wear and oxidationwear, while that of S2sample film is mainly abrasive wear and oxidation wear.(4) Compared with substrate, Ti-Ag and Ti-Ag-N films prepared bymagnetron reactive sputtering method exhibit better antimicrobial andwear resistance properties. Ti-Ag-N film prepared by Ti-Ag alloy targetwith3mm Ag, and Ar/N2with1:1shows more excellent antibacterialand anti-wear properties. |
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