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

主講人 : 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.

主講人簡介：

Elena V. Torskaya于1990年畢業于莫斯科物理與技術學院。1995年獲本校固體力學科學研究生（相當于博士）學位。自1994年開始在莫斯科儀器工程與信息學院任教，開發計算機科學的新課程。1995年，在俄羅斯科學院Ishlinsky力學研究所摩擦學實驗室工作。目前她是Ishlinsky研究所的首席研究員。2015年，她在該研究所獲得科學博士學位。2016年，她成為俄羅斯科學院教授。Torskaya博士著有兩部專著，在科學期刊上發表了70多篇論文。在過去的五年里，她是接觸力學和摩擦學領域七個俄羅斯和國際科學項目的負責人。她是以Kragelsky基命名的摩擦相互作用力學常設研討會的領導者（與Ivan Soldatenkov一起）。