Effect of Diamond Nanopowder and Silver Modifiers on the Tribological Properties of PEO Coatings on Aluminum Alloy

主讲人 :Prof. Elena Torskaya

High-strength aluminum alloys, in particular AlZn5.5MgCu, are widely used due to their low density and low cost. Their tribological properties are poor, so surface modification is required, one of which is plasma electrolytic oxidation (PEO). This study proposes a new type of modified PEO coatings, during the formation of which nanodiamonds (ND) and micro dispersed silver were added to electrolyte in different concentrations. A comprehensive method for studying coatings included friction and wear tests at room and elevated temperatures (100℃ and 200℃), elastic indentation with original method for processing the results, studying friction tracks and sections of samples using microscopy methods, and calculating stresses in coated bodies. It was obtained that wear of the modified coatings is only roughness smoothing. The failure of coatings with and without modifiers takes place through the mechanism of brittle fracture. The higher the test temperature, the more modifiers must be used to avoid the fracture, as well as to ensure a stable coefficient of friction. Samples with the largest volume of modifiers (9g/l ND + 9g/lAg in basic electrolyte) had COF in the range of 0.34-0.37 at all temperatures.

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主讲人简介：

Elena V. Torskaya于1990年毕业于莫斯科物理与技术学院。1995年获本校固体力学科学研究生（相当于博士）学位。自1994年开始在莫斯科仪器工程与信息学院任教，开发计算机科学的新课程。1995年，在俄罗斯科学院Ishlinsky力学研究所摩擦学实验室工作。目前她是Ishlinsky研究所的首席研究员。2015年，她在该研究所获得科学博士学位。2016年，她成为俄罗斯科学院教授。Torskaya博士著有两部专著，在科学期刊上发表了70多篇论文。在过去的五年里，她是接触力学和摩擦学领域七个俄罗斯和国际科学项目的负责人。她是以Kragelsky基命名的摩擦相互作用力学常设研讨会的领导者（与Ivan Soldatenkov一起）。