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Coatings 2018, 8(8), 287; https://doi.org/10.3390/coatings8080287

The Role of Thin-Film Vacuum-Plasma Coatings and Their Influence on the Efficiency of Ceramic Cutting Inserts

Department of High-efficiency Machining Technologies, Moscow State University of Technology STANKIN, Moscow 127055, Russia
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Received: 20 June 2018 / Revised: 17 July 2018 / Accepted: 6 August 2018 / Published: 17 August 2018
(This article belongs to the Special Issue Design and Synthesis of Hard Coatings)
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Abstract

The main problem with ceramics used in cutting tools is related to the unpredictable failures caused by the brittle fracturing of ceramic inserts, which is critical for the intermittent milling of cyclic loading. A 125-mm-diameter eight-toothed end mill, with a mechanical fastening of ceramic inserts, was used as a cutting tool for milling hardened steel (102Cr6). For the experiments, square inserts of the Al2O3 + SiC ceramic were used and compared with the samples made of Al2O3 + TiC to confirm the obtained results. The samples were coated with diamond-like coating (DLC), TiZrN, and TiCrAlN coatings, and their bending strength and adhesion were investigated. Investigations into the friction coefficient of the samples and operational tests were also carried out. The effect of smoothing the microroughness and surface defects in comparison with uncoated inserts, which are characteristic of the abrasive processing of ceramics, was investigated and analyzed. The process developed by the authors of the coating process allows for the cleaning and activation of the surface of ceramic inserts using high-energy gas atoms. The impact of these particles on the cutting edge of the insert ensures its sharpening and reduces the radius of curvature of its cutting edges. View Full-Text
Keywords: vacuum-plasma coatings; thin films; ceramics; cutting tool; cutting inserts; wear resistance; strength characteristics; surface defects; abrasive processing vacuum-plasma coatings; thin films; ceramics; cutting tool; cutting inserts; wear resistance; strength characteristics; surface defects; abrasive processing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Volosova, M.; Grigoriev, S.; Metel, A.; Shein, A. The Role of Thin-Film Vacuum-Plasma Coatings and Their Influence on the Efficiency of Ceramic Cutting Inserts. Coatings 2018, 8, 287.

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