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Influence of Alumina Particles on Tribology of Autocatalytic Ni-P Coatings at High Temperature

机译:氧化铝粒子对高温自催化Ni-P涂层摩擦学的影响

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摘要

The present work considers the effects of incorporation of hard Al_2O_3 particles on the structure, microhardness, and tribological behavior of electroless Ni-P coatings at room temperature and elevated temperature. Ni-P (9% P) coating shows a typical amorphous structure that changes to a mixture of nanocrystalline and amorphous structure due to the addition of alumina particles. The incorporation of Al_2O_3 particles is found to enhance the overall hardness and wear resistance of the Ni-P coating. Exposure to high temperature during tribological tests acts as brief heat treatment, initiating microstructural changes in the coating which further increases the hardness of the deposit. The scanning electron micrograph of the worn surface of the coating reveals both abrasive and adhesive wear phenomena governing the wear mechanism at elevated temperature. The development of the oxide layer is another important characteristic of the coatings examined under high temperatures (around 500°C).
机译:本作者考虑了硬al_2O_3颗粒在室温下掺入硬化Al_2O_3颗粒对化学镜涂层的结构,微硬度和摩擦学行为的影响。 Ni-P(9%P)涂层显示出由于添加氧化铝颗粒而改变纳米晶和无定形结构的混合物的典型非晶结构。 发现Al_2O_3颗粒的掺入以增强Ni-P涂层的总硬度和耐磨性。 在摩擦试验期间暴露于高温作用作用于简短的热处理,引发涂层的微观结构变化,进一步增加了沉积物的硬度。 涂层的磨损表面的扫描电子显微照片显示出在升高温度下控制磨损机制的磨料和粘合剂磨损现象。 氧化物层的发展是在高温(约500℃)下检查的涂层的另一个重要特征。

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