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Influence of application technology on the erosion resistance of DLC coatings

机译：施工工艺对DLC涂层耐冲蚀性能的影响

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Various components need protection against superimposed corrosion and wear (abrasion, erosion) loading, e.g. in off-shore applications. The goal of the research has been to develop a PVD multilayer coating by systematically altering the layer architecture in order to protect components against corrosive environments and erosive loadings. Our approach regarding the coating architecture has been to apply a diamond-like carbon (DLC) layer on top of a multilayer coating system, to ensure an excellent erosion resistance while providing a good corrosion protection. Our investigation is focused on the influence of the application technology (PVD or PECVD) and the resulting coating properties of the DLC top-layer. The investigated PECVD-top-layer was produced by a mixture of acetylene and hydrogen gas, whereas the PVD-top-layers were deposited from a graphite-target and different mixtures of acetylene and argon gas. The applicated DLC top-layers are characterized by hardness values between 11 and 23 GPa and similar adhesion properties. Note that hardness has been determined by nano-indentation and adhesion characterized by scratch testing. Residual stresses of the DLC-top-layers were determined by means of focused ion beam milling and tracking of the resulting relaxation strains by digital image correlation. Residual compressive stresses up to 2 GPa have been determined. Under loading in an erosive environment (combination of abrasive and fatigue loading) the abrasive degradation of the investigated coatings has been found to depend mainly on coating hardness. As expected, the hardest DLC top-layer (PECVD) shows least abrasive degradation. However, when tested under cyclic loading, the coating exhibiting the highest hardness values (PECVD) show the most severe fatigue damage of all DLC coatings investigated.
机译：各种组件都需要防止重叠的腐蚀和磨损（磨损，侵蚀）负荷的保护，例如在海上应用中。该研究的目的是通过系统地改变层结构来开发PVD多层涂层，以保护组件免受腐蚀环境和侵蚀性载荷的影响。我们关于涂层结构的方法是在多层涂层系统的顶部施加类金刚石碳（DLC）层，以确保出色的耐蚀性，同时提供良好的腐蚀保护。我们的研究集中在应用技术（PVD或PECVD）的影响以及DLC顶层产生的涂层性能上。所研究的PECVD顶层是由乙炔和氢气的混合物生产的，而PVD顶层是由石墨靶材和乙炔和氩气的不同混合物沉积的。涂覆的DLC顶层的特征在于11至23 GPa之间的硬度值和相似的粘合性能。请注意，硬度是通过纳米压痕和附着力（以划痕测试为特征）确定的。 DLC顶层的残余应力通过聚焦离子束铣削和通过数字图像相关性跟踪所得的松弛应变来确定。已经确定了高达2 GPa的残余压应力。在侵蚀性环境中的负荷下（磨料和疲劳负荷的组合），发现所研究涂层的磨料降解主要取决于涂层的硬度。不出所料，最硬的DLC顶层（PECVD）表现出的磨料降解最少。但是，在循环载荷下进行测试时，表现出最高硬度值（PECVD）的涂层在所有研究的DLC涂层中显示出最严重的疲劳损伤。

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