Synthesis of a new orthorhombic form of diamond in varying-C VN films: Microstructure, mechanical and tribological properties

被引：37
作者：
Cai, Zhaobing [1 ]
Pu, Jibin [1 ]
Wang, Liping [1 ]
Xue, Qunji [1 ]
机构：
[1] Chinese Acad Sci, Key Lab Marine Mat & Related Technol, Key Lab Marine Mat & Protect Technol Zhejiang Pro, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2019年 / 481卷
基金：
中国国家自然科学基金;
关键词：
Orthorhombic diamond; Amorphous C; Varying-C VN films; Microstructure; Mechanical and tribological properties; TIALVN-COATINGS; NANOCOMPOSITE COATINGS; CARBON; FRICTION; TEMPERATURE; BEHAVIOR; WEAR; GRAPHITE; NITRIDE; TRANSPORT;
D O I：
10.1016/j.apsusc.2019.03.126
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
By theory calculation, a new orthorhombic form of diamond has been proved to exist. In this work, the orthorhombic diamond is clearly observed in the multiarc ion-plated varying-C VN films and the effect of C content on the microstructure, mechanical and tribological properties of varying-C VN films were studied in detail. The C doping results in the mechanical and tribological propertie's improvement, together with the decrease of surface roughness and residual stress, and with the increase of C content, the scratch-resistance and wear-resistance capacities increase. The orthorhombic diamond phase only appears in VCN film with 10.97 at.% C, leading to that this VCN film has a relative low room-temperature friction coefficient (similar to 0.56) compared with other films (similar to 0.70), due to the easy-shear layered atomic structure. The VCN film containing 19.14 at.% C with the highest H/E and H-3/E-2 ratios of 0.052 and 0.091 GPa has the minimum wear rate (0.53 x 10(-14) m(3) N-1 m(-1)), 82% lower than that of VN film (2.89 x 10(-14) m(3) N-1 m(-1)), due to the valid assembly of VN, VC and amorphous C phase with perfect balance of hardness and toughness. However, against Al2O3 grinding ball, the main wear mechanisms of all varying-C VN films are adhesive wear and oxidative wear.
引用
收藏
页码：767 / 776
页数：10
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