Tight-binding quantum chemical molecular dynamics study on the friction and wear processes of diamond-like carbon coatings: Effect of tensile stress

Yang Wang, Jingxiang Xu, Yusuke Ootani, Shandan Bai, Yuji Higuchi, Nobuki Ozawa, Koshi Adachi, Jean Michel Martin, Momoji Kubo

研究成果: Article査読

24 被引用数 (Scopus)

抄録

Diamond-like carbon (DLC) coatings have attracted much attention as an excellent solid lubricant due to their low-friction properties. However, wear is still a problem for the durability of DLC coatings. Tensile stress on the surface of DLC coatings has an important effect on the wear behavior during friction. To improve the tribological properties of DLC coatings, we investigate the friction process and wear mechanism under various tensile stresses by using our tight-binding quantum chemical molecular dynamics method. We observe the formation of C-C bonds between two DLC substrates under high tensile stress during friction, leading to a high friction coefficient. Furthermore, under high tensile stress, C-C bond dissociation in the DLC substrates is observed during friction, indicating the atomic-level wear. These dissociations of C-C bonds are caused by the transfer of surface hydrogen atoms during friction. This work provides atomic-scale insights into the friction process and the wear mechanism of DLC coatings during friction under tensile stress.

本文言語English
ページ(範囲)34396-34404
ページ数9
ジャーナルACS Applied Materials and Interfaces
9
39
DOI
出版ステータスPublished - 2017 10 4

ASJC Scopus subject areas

  • 材料科学(全般)

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