Effects of substrate roughness on the tribological properties of duplex plasma nitrided and MoS2 coated Ti6Al4V alloy
Effects of substrate roughness on the tribological properties of duplex plasma nitrided and MoS2 coated Ti6Al4V alloy
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DOI：
10.1016/j.triboint.2023.109123
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发表时间：
2023-11
影响因子：
6.2
通讯作者：
Hui Chen;Wenli Wang;Kai Le;Yuzhen Liu;Xiaoming Gao;Yong Luo;Xu Zhao;Xingnan Liu;
中科院分区：
文献类型：
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作者：
Hui Chen;Wenli Wang;Kai Le;Yuzhen Liu;Xiaoming Gao;Yong Luo;Xu Zhao;Xingnan Liu;
Ti6Al4V合金较差的表面抗剪切性能限制了其在运动部件中的应用。为了提高其摩擦学性能，提出了一种等离子体渗氮和MoS2涂层的双重处理方法。目的是增强承载能力、优化表面粗糙度并延长 MoS2 涂层的使用寿命。与未经处理的合金相比，等离子渗氮显着提高了表面硬度 2.3 倍。硬化表面下的 MoS2 涂层在 25% 相对湿度下的摩擦系数低至 0.05。具有粗糙表面的双面处理样品的寿命为 11.90 小时，是光滑表面样品的六倍。较高的次表面粗糙度有利于润滑剂的储存、释放和连续摩擦膜的形成，从而延长使用寿命。
The poor surface shear resistance of Ti6Al4V alloy limits its applications involving moving components. To improve its tribological properties, a duplex treatment method involving plasma nitriding and MoS2coating was proposed. The objective was to enhance load-bearing capacity, optimize surface roughness, and extend the lifetime of the MoS2coating. Plasma nitriding significantly increased surface hardness by 2.3 times compared to untreated alloy. MoS2coating on the hardened subsurface resulted in low friction coefficients of 0.05 at 25 % relative humidity. The duplex treated sample with a rough subsurface showed a lifetime of 11.90 h, six times better than the smooth subsurface sample. Higher subsurface roughness facilitated lubricant storage, release, and the formation of a continuous tribofilm, resulting in longer lifetime.