Influence of silver content on the tribomechanical behavior on Ag-TiCN bioactive coatings
Influence of silver content on the tribomechanical behavior on Ag-TiCN bioactive coatings
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DOI：
10.1016/j.surfcoat.2011.09.059
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发表时间：
2012-01
影响因子：
5.4
通讯作者：
J. C. Sánchez-López;M. Abad;I. Carvalho;R. Galindo;N. Benito;S. Ribeiro;Maria João Henriques;A. Cavaleiro;S. Carvalho
中科院分区：
文献类型：
--
作者：
J. C. Sánchez-López;M. Abad;I. Carvalho;R. Galindo;N. Benito;S. Ribeiro;Maria João Henriques;A. Cavaleiro;S. Carvalho
对生物医用材料进行表面改性已成为提高其生物相容性的重要前提。特别是，为了克服颗粒的产生，基于碳（氮）并含有抗菌元素如银的低磨损涂层是有希望的候选物。因此，本工作探讨了直流非平衡反应磁控溅射法制备含银碳氮化物基（Ag-TiCN）薄膜的潜力。镀层中的银含量在0 ~ 26.7at.%之间变化通过改变靶和含Ar的混合气体中C_2H_2和N_2的含量，对所获得的Ag-TiCN基涂层的成分和显微结构进行了表征。通过纳米压痕和往复式销盘试验研究了薄膜在胎牛血清溶液中的力学性能和摩擦学性能。在摩擦学试验后的接触区域进行了拉曼，扫描电子显微镜和能量色散X射线分析，以获得有关的摩擦机制的信息。通过使用成纤维细胞的体外试验评估涂层的细胞毒性。涂层包含TiCxN 1 −x、Ag和a-C（N）x相的混合物，其相对比例取决于Ag/Ti比。的机械，摩擦学和细胞毒性性能与化学和相组成。当Ag/Ti比小于0.20（Ag含量<6.3at.%）时，薄膜更硬（~ 18 GPa），具有更高的耐磨性（~10− 6 mm 3/Nm），显示出相似的摩擦系数（~0.3）和良好的生物相容性。
Surface modification of bulk materials used in biomedical applications has become an important prerequisite for better biocompatibility. In particular, to overcome the particle generation, low-wear coatings based on carbon (nitrogen) and containing antimicrobial elements such as silver are promising candidates. Thus, the present work explores the potentialities of silver-containing carbonitride-based (Ag-TiCN) thin films prepared by direct current unbalanced reactive magnetron sputtering. The silver content in the coatings was varied from 0 to 26.7at.% by changing the targets and the fraction of C2H2and N2in the gas mixture with Ar. The obtained Ag-TiCN based coatings were characterized in terms of composition and microstructure. Mechanical and tribological properties of the films were studied by nanoindentation and reciprocating pin-on disk testing in a fetal bovine serum solution, respectively. Raman, scanning electron microscope and energy dispersive X-ray analysis was carried out in the contact region after tribological tests to obtain information about the friction mechanism. The cytotoxicity of the coatings was assessed by in vitro tests using fibroblast cells. The coatings comprised a mixture of TiCxN1−x, Ag and a-C(N)xphases whose relative proportion varied depending on the Ag/Ti ratio. The mechanical, tribological and cytotoxicity properties were correlated with the chemical and phase composition. When the Ag/Ti ratios were below 0.20 (Ag contents <6.3at.%) the films resulted harder (~18GPa) with higher wear resistance (~10−6mm3/Nm), showing similar friction coefficient (~0.3) and good biocompatibility.