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在氮气气氛、高压条件下,利用等离子渗氮技术于刀具用硬质合金刀片表面制备氮化物涂层。利用X射线衍射仪(XRD)表征涂层物相,显微硬度计测试涂层显微硬度,扫描电镜(SEM)表征涂层表面及截面微观形貌。通过对比硬质合金试样和涂层试样的摩擦系数,衡量涂层耐磨性能;通过观察摩擦磨损实验后表面微观形貌,研究硬质合金和涂层试样的摩擦磨损机理。结果表明:涂层物相以TiN为主,层厚5μm左右;涂层与基体间紧密结合,无明显间隙与裂纹;硬质合金基体的摩擦系数在0.4左右,且出现较大波动,而涂层摩擦系数稳定在0.2左右。在硬质合金表面制备的等离子渗氮涂层可有效提高基体的耐磨性能。
Nitride coating was prepared on the surface of carbide blade by plasma nitriding under nitrogen atmosphere and high pressure. The phase of coating was characterized by X-ray diffraction (XRD). The microhardness of coating was measured by microhardness tester. The surface and cross-sectional morphology of coating were characterized by scanning electron microscopy (SEM). The wear resistance of the coating was measured by comparing the coefficient of friction between the samples and the coating samples. The friction and wear mechanism of the samples were tested by observing the microstructure of the samples after the friction and wear tests. The results show that the coating is mainly composed of TiN and the thickness is about 5μm. The coating is tightly bonded with the substrate without obvious gaps and cracks. The friction coefficient of the cemented carbide substrate is about 0.4, Layer friction coefficient stabilized at about 0.2. The plasma nitriding coating prepared on the cemented carbide surface can effectively improve the wear resistance of the substrate.