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首页> 外文期刊>ACS applied materials & interfaces >Surface Fatigue Behavior of a WC/aC:H Thin-Film and the Tribochemical Impact of Zinc Dialkyldithiophosphate
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Surface Fatigue Behavior of a WC/aC:H Thin-Film and the Tribochemical Impact of Zinc Dialkyldithiophosphate

机译：WC / Ac的表面疲劳行为：H薄膜和锌二烷基二磷酸磷酸盐的卷曲效应

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In wind turbine gearboxes, (near-)surface initiated fatigue is attributed to be the primary failure mechanism. In this work, the surface fatigue of a hydrogenated tungsten carbide/amorphous carbon (WC/aC:H) thin-film was tested under severe cyclic tribo-contact using polyalphaolefin (PAO) and PAO + zinc dialkyldithiophosphate (ZDDP) lubricants. The film was characterized in terms of its structure and chemistry using X-ray diffraction, analytical transmission electron microscopy, including electron energy loss spectroscopy (EELS), as well as X-ray photoelectron spectroscopy (XPS). The multilayer carbon thin-film exhibited promising surface fatigue performance showing a slight change in the hybridization state of the aC:H matrix. Dehydrogenation of the thin-film and subsequent transformation of cleaved C–H bonds to nonplanar sp~(2) carbon rings were inferred from EELS and XPS results. While tribo-induced changes to the aC:H matrix were not influenced by a nanometer-thick ZDDP reaction-film, the rate of oxidation of WC and its oxidation state were affected. While accelerating surface fatigue on a steel surface, the ZDDP-tribofilm protected the WC/aC:H film from surface fatigue. In contrast to the formation of polyphosphates from ZDDP molecules on steel surfaces, it appeared that on the WC/aC:H thin film surface, ZDDP molecules decompose to ZnO, suppressing the oxidative degradation of WC.
机译：在风力涡轮机齿轮箱中，（近）表面引发的疲劳归因于主要故障机制。在这项工作中，使用聚αOLEFIN（PAO）和PAO +锌二磷磷酸（ZDDP）润滑剂在严重的循环摩擦接触下测试氢化碳化钨/无定形碳（WC / AC：H）薄膜的表面疲劳。使用X射线衍射，分析透射电子显微镜（包括电子能量损失光谱（EEL）以及X射线光电子体光谱（XPS），其特征在于其结构和化学的特征。多层碳薄膜表现出有希望的表面疲劳性能，显示AC：H基质的杂交状态略有变化。从鳗鱼和XPS结果推断出薄膜和随后转化为非平面SP〜（2）碳环的薄膜和随后转化。虽然摩擦诱导的AC：H基质的变化不受纳米厚的ZDDP反应膜的影响，但WC的氧化率和其氧化态受到影响。虽然在钢表面上加速表面疲劳，但ZDDP-Tricofilm受到表面疲劳的WC / Ac：H膜。相反，与钢表面上的ZDDP分子的多磷酸盐形成相比，在WC / Ac：H薄膜表面上，ZDDP分子分解为ZnO，抑制WC的氧化降解。

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