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中南大学学报(英文版)

Journal of Central South University

Vol. 25    No. 3    March 2018

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Microstructure, mechanical properties, and milling performance of arc-PVD AlTiN–Cu and AlTiN/AlTiN–Cu coatings
CHEN Hao(陈浩)1, CHEN Kang-hua(陈康华)1, XU Yin-chao(徐银超)1, 2,PAN Chen-xi(潘晨曦)1, YI Ji-yong(易继勇)1, ZHU Chang-jun(祝昌军)1

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Zhuzhou Cemented Carbide Cutting Tools Co. Ltd., Zhuzhou 412000, China

Abstract:AlTiN, AlTiN–Cu and AlTiN/AlTiN–Cu coatings were prepared on WC–6%Co substrates by cathode arc evaporation deposition technology. Two kinds of nitrogen pressures were used to deposit both AlTiN–Cu and AlTiN/AlTiN–Cu coatings. Surface and cross-sectional morphologies of films were observed by scanning electron microscopy (SEM). Crystal structure of films was analyzed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Hardness and adhesion of films were measured by nano-indentation and nano-scratch tester. Cutting tests were performed under milling conditions during wet machining of TC4 alloy. The results show that with addition of Cu, more droplets occur on AlTiN coating surface, but the grain size of it is refined, and the hardness decreases but the toughness is improved. Under higher N2 pressure, the defects on the surface of AlTiN–Cu and AlTiN/AlTiN–Cu coatings diminish, and the hardness of them is enhanced, while the adhesion is reduced. Compared to AlTiN coated cemented carbide tool, the lifetimes of AlTiN–Cu and AlTiN/AlTiN–Cu coated tools under the same N2 pressure are improved by 11% and 24%, respectively.

 

Key words: coated cemented carbide; AlTiN–Cu; AlTiN/AlTiN–Cu; N2 pressure; milling

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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