Substrate and bonding layer effects on performance of DLC and TiN biomedical coatings in Hank's solution under cyclic impact-sliding loads
Substrate and bonding layer effects on performance of DLC and TiN biomedical coatings in Hank's solution under cyclic impact-sliding loads
复制标题
循环冲击滑动载荷下汉克溶液中基材和粘合层对 DLC 和 TiN 生物医学涂层性能的影响
DOI：
10.1016/j.surfcoat.2013.09.029
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发表时间：
2013
影响因子：
5.4
通讯作者：
Chen Y
中科院分区：
文献类型：
--
作者：
Chen Y
在无润滑的环境和Hank平衡盐溶液(HBSS)中进行了循环倾斜冲击-滑动磨损试验，研究了DLC和TiN生物医用涂层在相对柔软但耐腐蚀的钛合金(Ti6Al4V)和硬但易腐蚀的AISI M2钢上的接触疲劳磨损行为。该试验旨在模拟涂层在冲击和滑动联合运动下的磨损。在每个冲击-滑动循环中，力包括动态冲击载荷Fi(140nN)和“挤压”载荷Fp(300nN)。正如预期的那样，在环境测试条件下，两种涂层在硬质M2基板上的表现都好于钛基板。在HBSS润滑液试验条件下，无论是粘结层还是基材都没有明显的腐蚀退化，相反，该溶液起到了润滑作用，提高了涂层的性能。当DLC涂层外壳的粘结层为硅基时，在一定次数的测试循环后，它不能阻止裂纹向衬底中扩展。裂纹的开口允许HBSS溶液接触衬底，当衬底是耐腐蚀的钛合金时，这应该只会造成小问题。然而，当衬底是可腐蚀的M2时，发生了严重的腐蚀引起的界面弱化。当涂层粘结层为TiN涂层中的钛层时，它可以在一定程度上起到腐蚀和裂纹屏障的作用，防止M2钢的界面退化。因此，当基材的防腐性能较差时，耐腐蚀粘结层及其在循环动态载荷下阻止裂纹扩展的能力可以对涂层的性能产生积极影响。
A cyclic inclined impact–sliding test was operated in an unlubricated, ambient environment and Hank's balanced salt solution (HBSS) to study the contact fatigue wear behavior of DLC and TiN biomedical coatings on relatively soft but corrosion resistant Ti alloy (Ti6Al4V) and hard but corrodible AISI M2 steel as model systems. The test was designed to simulate coating wear under combined impact and sliding motion. In each impact–sliding cycle, the forces comprised a dynamic impact load, Fi(140 N) and a “pressing” load, Fp(300 N). As expected, both coatings performed better on hard M2 substrates than Ti substrates under ambient test conditions. In the HBSS-lubricated solution test conditions, no obvious corrosion degradation occurred when either the bonding layers or substrates were Ti-based; instead, the solution provided a lubricating effect and enhanced coating performance. When the bonding layer for the DLC coating case was Si-based, it could not prevent crack propagation into the substrate after a certain number of test cycles. The crack opening allowed the HBSS solution to contact the substrates, which should only cause a minor problem when the substrate was a corrosion-resistant Ti alloy. However, when the substrate was corrodible M2, a severe corrosion-induced weakening of the interface occurred. When the coating bonding layer was a Ti layer (within the TiN coating), it could function to some extent as a corrosion and crack barrier to protect the M2 steel from interface degradation. Thus, a corrosion-resistant bonding layer and its ability to impede extension of cracking under cyclic dynamic loads can have a positive influence on the coating performance when the substrate has inferior anti-corrosion properties.