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博士生孙锟参加国际会议回国报告

发布时间:2019-09-24 点击数:

汇报题目参加International Tribology Conference (ITC) 2019参会报告

报时间:2019.9.25(星期31000

汇报地点:轴承所1330会议室

汇报人:孙锟

会议名称International Tribology Conference

会议时间:17-21 Sept 2019

会议地点:Sendai, Japan

会议简介:

The International Tribology Conference (ITC) was founded by the Japanese Society of Tribologists (JAST). The ITC was first held in Tokyo (1985) following the JSLE-ASLE International Lubrication Conference (1975). Following successful conferences in Nagoya (1990), Yokohama (1995), Nagasaki (2000), Kobe (2005), Hiroshima (2011), and Tokyo (2015), ITC 2019 will be held in Sendai, Japan. Tribology is the interdisciplinary study encompassing surface physics and chemistry, material science, and fluid dynamics. For this reason, an integrative approach is imperative to clarify issues related to tribology. Interdisciplinary studies and discussion on the future direction of various fields is heavily promoted. It is our hope that researchers would report the latest developments in their respective fields in a lively, stimulating and interactive environment. Active participation of young researchers, specifically students, is strongly encouraged.

参会论文信息

Title: The key of current density for controlling the friction behavior of a-C film

Author: Kun Sun, Dongfeng Diao and Xue Fan

Abstract: Generally, the steel-carbon sliding interface shows a high friction (μ=0.1~0.3) in the ambient air. By applying direct current (DC) at the steel-carbon contact interface with forming contact-focusing electron (CFE), the friction coefficients have been verified to reduce one order of magnitude. In our previous work, with the CFE-method, the friction coefficient of amorphous carbon (a-C) film sliding against bearing steel ball reduced from 0.21 to 0.02~0.05. While the relationship of the low-friction and CFE density was not clear, especially the critical CFE density to the low-friction. In order to investigate the role of CFE density on the low-friction, in this study, the magnitude of current and the area of the contact point were controlled to adjust the CFE density during friction tests. The details are following. The a-C films were deposited on a highly conductive P-type silicon wafer (resistance: <0.0015Ω cm) with a divergent electron cyclotron resonance (ECR) plasma sputtering system. Based on a reciprocating tribo-meter, friction tests of a-C film sliding against steel ball were performed, and the current was applied through the contact interface. The CFE density was estimated by the ratio of the magnitude of current and the area of the contact point. The current was adjusted from 0 to 1.0 A by a source meter. The area of contact point was controlled by the steel balls with different diameters (3.2 mm ~7.9 mm) under the normal load of 3 N. Based on the Hertz contact theory, the contact area was varied from 3200 to 6000 μm2. The friction force was measured by the strain gage. The results suggested that the critical CFE density to the low-friction of a-C sliding against steel ball was estimated to be 0.049 mA/μm2. In order to investigate low-friction interface between a-C and steel ball, Raman spectroscopy, scanning electron microscope, transmission electron microscope were performed. This study might have a guide for the low-friction application of a-C films with CFE-method.


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