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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讲课人详细资料：Elena V. Torskaya于一九九零年是毕业于墨西哥巴黎数学与能力职业技术学校。1995年获本所学校物质测力专业学课调查生（一样于博士生生生）硕士学区房。自1998年刚开始在墨西哥巴黎器材工程建设与问题职业技术学校任职，的开发测算机专业学课的新拓展课。1995年，在墨西哥科职业技术学校Ishlinsky测力调查所滚动静矛盾学实验英文室工作任务。当前她是Ishlinsky调查所的首席总裁调查员。20多年，她在该调查所才能得到专业学课博士生生生硕士学区房。2016，她为墨西哥科职业技术学校教学。Torskaya博士生生生著有2个学术专著，在专业学课刊物上发表综述了70篇综述。在过来的10年里，她是接触到测力和滚动静矛盾学方面八个墨西哥和国外专业学课工程的承担人。她是以Kragelsky基命名大全的滚动静矛盾相互间功能测力经常举行研究讨论会的上司者（与Ivan Soldatenkov一起去）。