Tribological characterization of a biocompatible thin film of UHMWPE on Ti6Al4V and the effects of PFPE as top lubricating layer.
Tribological characterization of a biocompatible thin film of UHMWPE on Ti6Al4V and the effects of PFPE as top lubricating layer.
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DOI：
10.1016/j.jmbbm.2011.02.005
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发表时间：
2011-10
影响因子：
3.9
通讯作者：
B. Panjwani;N. Satyanarayana;S. Sinha
中科院分区：
文献类型：
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作者：
B. Panjwani;N. Satyanarayana;S. Sinha
采用浸涂法在Ti6Al4V合金试样上涂覆超高分子量聚乙烯（UHMWPE）薄膜。在球盘式摩擦计上使用直径为4 mm的si3n4球表面对涂层（厚度为19.6±2.0 μm）的摩擦学性能进行了测试。在不同的正常载荷（0.5、1.0、2.0和4.0 N）和磁盘转速（200和400 rpm）下进行了测试。本研究制备的超高分子量聚乙烯涂层具有较高的疏水性，水接触角为135.5±3.3°，符合ISO 10993-5洗脱法细胞毒性试验要求。该涂层在测试条件下具有低摩擦系数（0.15）和高耐磨性（>96,000次循环）。在更高转速（1000转/分）下，UHMWPE涂层上的PFPE涂层进一步提高了UHMWPE涂层的耐磨性。
Ultra-high molecular weight polyethylene (UHMWPE) thin film was coated onto Ti6Al4V alloy specimens using dip coating method. Tribological performance of this coating (thickness of 19.6±2.0 μm) was evaluated using 4 mm diameter Si3N4ball counterface in a ball-on-disk tribometer. Tests were carried out for different normal loads (0.5, 1.0, 2.0 and 4.0 N) and rotational speeds of the disk (200 and 400 rpm). UHMWPE coating formed in this study exhibits high hydrophobicity with water contact angle of 135.5±3.3° and meets the requirements of cytotoxicity test using the ISO 10993-5 elution method. This coating shows low coefficient of friction (0.15) and high wear durability (>96,000 cycles) for the tested conditions. PFPE overcoat on UHMWPE has further increased the wear durability of UHMWPE coating as evaluated at even higher rotational speed of 1000 rpm.