Cr-C类石墨复合涂层制备表征及其在硬质合金铣刀上的应用OACHSSCDCSTPCD
Preparation and characterization of Cr-C type graphite composite coating and its application in cemented carbide milling cutters
为了提高硬质合金铣刀的使用寿命,降低摩擦加工时的摩擦因数,本文结合Cr元素对涂层生长的促进作用与类石墨(GLC)涂层的优异性能,采用磁控溅射离子镀的方法,在硬质合金(YG8)上制备Cr-C类石墨复合涂层.通过拉曼光谱对复合涂层成分类石墨进行表征.利用扫描电镜观察涂层截面形貌,结合线扫描与面扫描结果对涂层元素成分分布进行表征.对复合涂层试样进行摩擦磨损试验,测定摩擦因数并计算磨损率,采用硬度测量仪测定复合涂层的硬度,使用自动划痕仪来评定复合涂层结合力.结果表明:Cr-C类石墨复合涂层具有典型的类石墨非晶碳结构特征,复合涂层整体厚度约为0.68 μm;Cr元素主要分布在底层与过渡层,少量掺杂在工作层;C元素主要分布在工作层中,各层涂层内部没有裂纹、孔洞等缺陷,涂层的致密性较好.Cr-C类石墨复合涂层摩擦因数约为0.2,由磨痕形貌测得磨损体积为65.665 1 mm3,磨损率为2.28×10-4 mm3/(N·mm),复合涂层摩擦因数低,耐磨性好.复合涂层硬度可达824～986 HRV,与传统类石墨涂层相比,硬度提升28.22％～51.69％,复合涂层与基体之间的结合力为24 N,与同样应用于硬质合金铣刀的涂层相比,具有良好的结合性能.本文研究可为Cr-C类石墨复合涂层在硬质合金铣刀中的应用提供依据.
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.
张哲轩;杨忠仪;夏荣华;李新陈;彭浩
南京工业大学机械与动力工程学院,江苏 南京 211800南京工业大学材料科学与工程学院,江苏 南京 211800
金属材料
复合涂层磁控溅射类石墨硬质合金铣刀铝合金摩擦因数涂层致密性
composite coatingmagnetron sputteringgraphitecarbide milling cutteraluminum alloyfriction coefficientcompactness of coating
《南京工业大学学报（自然科学版）》 2024 (001)
55-64 / 10
国家自然科学基金(51776095)
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