Se Nanopowder Conversion into Lubricious 2D Selenide Layers by Tribochemical Reactions,Advanced Materials

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Se Nanopowder Conversion into Lubricious 2D Selenide Layers by Tribochemical Reactions
Advanced Materials ( IF 27.4 ) Pub Date : 2023-05-29 , DOI: 10.1002/adma.202302076
Philipp G Grützmacher ₁ , Michele Cutini ₂ , Edoardo Marquis ₂ , Manel Rodríguez Ripoll ₃ , Helmut Riedl ₄ , Philip Kutrowatz ₄ , Stefan Bug ₁ , Chia-Jui Hsu ₁ , Johannes Bernardi ₅ , Carsten Gachot ₁ , Ali Erdemir ₆ , Maria Clelia Righi ₂

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Transition metal dichalcogenide (TMD) coatings have attracted enormous scientific and industrial interest due to their outstanding tribological behavior. The paradigmatic example is MoS₂, even though selenides and tellurides have demonstrated superior tribological properties. Here, an innovative in operando conversion of Se nanopowders into lubricious 2D selenides, by sprinkling them onto sliding metallic surfaces coated with Mo and W thin films, is described. Advanced material characterization confirms the tribochemical formation of a thin tribofilm containing selenides, reducing the coefficient of friction down to below 0.1 in ambient air, levels typically reached using fully formulated oils. Ab initio molecular dynamics simulations under tribological conditions reveal the atomistic mechanisms that result in the shear-induced synthesis of selenide monolayers from nanopowders. The use of Se nanopowder provides thermal stability and prevents outgassing in vacuum environments. Additionally, the high reactivity of the Se nanopowder with the transition metal coating in the conditions prevailing in the contact interface yields highly reproducible results, making it particularly suitable for the replenishment of sliding components with solid lubricants, avoiding the long-lasting problem of TMD-lubricity degradation caused by environmental molecules. The suggested straightforward approach demonstrates an unconventional and smart way to synthesize TMDs in operando and exploit their friction- and wear-reducing impact.

中文翻译：

通过摩擦化学反应将 Se 纳米粉末转化为润滑的二维硒化物层

过渡金属二硫属化物 (TMD) 涂层因其出色的摩擦学行为而引起了科学和工业界的广泛关注。典型的例子是 MoS ₂，尽管硒化物和碲化物已表现出优异的摩擦学性能。在这里，描述了一种创新的操作方法，通过将硒纳米粉末喷洒到涂有钼和钨薄膜的滑动金属表面上，将硒纳米粉末转化为润滑的二维硒化物。先进的材料表征证实了含有硒化物的薄摩擦膜的摩擦化学形成，将环境空气中的摩擦系数降至 0.1 以下，使用全配方油通常可以达到这一水平。摩擦学条件下的从头算分子动力学模拟揭示了剪切诱导纳米粉末合成硒化物单层的原子机制。使用 Se 纳米粉末可提供热稳定性并防止真空环境中脱气。此外，硒纳米粉末与过渡金属涂层在接触界面普遍存在的条件下具有高反应活性，可产生高度可重复的结果，使其特别适合用固体润滑剂补充滑动部件，避免长期存在的TMD-问题。环境分子引起的润滑性能下降。建议的简单方法展示了一种非常规且智能的方法来合成 TMD，并利用其减少摩擦和磨损的影响。

更新日期：2023-05-29

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