Preparation of CrCN Super-Hard Coating
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Preparation of CrCN Super-Hard Coating Tianyuan Zhang, Chenliang Mu, Guolong Zhao, Xuyang Chu, and Yunsong Lian Submitted: 11 July 2020 / Revised: 25 September 2020 / Accepted: 24 October 2020 The cutting tool is prone to wear and failure during turning process, which affects the quality of the machined surface. In order to increase the hardness, wear resistance, and extend lifespan of the cutting tool, this work proposed a CrCN super-hard coating and optimized its parameters of preparation process. The CrCN super-hard coating was deposited on cemented carbides by radio frequency reactive magnetron sputtering. Cr3C2 (99.9%) was selected as the target, N2 and Ar as the reaction gas. The effects of power, N2/Ar flow ratio, deposition temperature, and deposition pressure on the properties of deposited CrCN super-hard coatings were investigated. The deposition rate, Vickers hardness, crystal degree, and surface morphology of the coating were comprehensive analyzed, and then, the optimal parameters for preparing CrCN super-hard coating were obtained: sputtering power of 300 W, N2/Ar gas flow ratio of 4/46 sccm, deposition temperature of 200 °C, and deposition pressure of 0.8 Pa. After measurement, the physical and mechanical properties of the CrCN super-hard coating were: the thickness of 1.8 lm, the hardness of 2700 HV, and the bonding force of 52 N. Keywords
CrCN super-hard coating, deposition parameters optimization, radio frequency reactive magnetron sputtering
1. Introduction In the actual cutting process, the cutting tool will produce various forms of wear and damage, such as chemical wear, rake face wear, fracture, and chipping. In order to reduce the wear of cutting tool and extend its lifespan, researchers have begun to study various novel cutting tools, such as micro-textured tools (Ref 1-4), self-lubricating tools (Ref 5, 6), and coated tools (Ref 7-9). About 85% of the cemented carbide tools used in manufacturing industries is coated tool, and this tool is widely used in application. That is because it is an effective way to solve severe problems such as wear (Ref 10). Coated tools are the combination of high strength, toughness, and rigidity, which improves the wear resistance of cutting tool on the premise of ensuring tool toughness (Ref 11). The coating of tool relies on tool coating technology. The technology of coating a layer of coating material on the tool substrate to make it have good wear resistance, thermal conductivity, high surface hardness, heat resistance, oxidation resistance, and low friction factor is called
Tianyuan Zhang and Xuyang Chu, Department of Mechanical and Electrical Engineering, Xiamen University, Xiamen 361102, PeopleÕs Republic of China; Chenliang Mu, Shanghai Aerospace Control Technology Institute, 1555 Zhongchun Road, Shanghai 201109, PeopleÕs Republic of China; Guolong Zhao, Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PeopleÕs Republic of Chi
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