Preparation and characterization of Cr-C type graphite composite coating and its application in cemented carbide milling cutters
This study aims to enhance the service life of carbide milling cutters and reduce the friction coefficient during machining.A novel approach integrating the coating growth benefits of chromium(Cr)with the superior attributes of graphite-like carbon(GLC)was presented.Cr-C type graphite-like composite coatings were fabricated on cemented carbide(YG8)using magnetron sputtering ion plating.Raman spectroscopy was used to characterize the graphite-like component of the composite coating.Scanning electron microscopy(SEM)was employed to observe the coating's cross-sectional morphology,and the elemental composition distribution was detailed through line and surface scanning.Friction and wear tests conducted on the composite coating samples revealed crucial performance indicators.The friction coefficient and wear rate were measured,the hardness of the composite coating was tested by hardness tester,and the bonding strength was evaluated by automatic scratch tester.The Cr-C type graphite-like composite coating exhibited a typical graphite-like amorphous carbon structure with an overall thickness of approximately 0.68 µm.Chromium predominantly resided in the bottom and transition layers,with a minor presence in the working layer.Carbon was chiefly distributed in the working layer.The interior of all layers was devoid of cracks,holes,or other defects indicating excellent compactness.The Cr-C graphite-like composite coating's friction coefficient was approximately 0.2,the wear volume measured through worn surface morphology was 65.665 1 mm3,and the wear rate was 2.28 × 10-4 mm3/(N·mm).These properties showed the coating's low friction coefficient and high wear resistance.The hardness of the composite coating ranged from 824 to 986 HRV,marking a 28.22％-51.69％increase compared to traditional graphite-like coatings.The bonding strength between the composite coating and the substrate was measured at 24 N,exhibiting a robust performance compared to coatings in cemented carbide milling cutters.This research laid a foundational basis for applying Cr-C type graphite-like composite coatings in cemented carbide milling cutters.
composite coatingmagnetron sputteringgraphitecarbide milling cutteraluminum alloyfriction coefficientcompactness of coating
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