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利用HVOF制备了WC-12C0涂层,喷涂原始粉末为微纳米复合粉,涂层的厚度分别为0.5,1,2,3,4 mm。采用扫描电镜(SEM)、X射线衍射仪(XRD)分析了涂层的显微结构和相组成,并对涂层的孔隙率进行了测量。结果表明,厚度对涂层的表面形貌与表面粗糙度无明显的影响,但对截面显微结构有较大影响,厚度小于1 mm的涂层沿厚度方向显微结构无明显变化,而厚度大于1 mm的涂层中部组织比较致密,孔隙率小,涂层与基体结合区域及近表面区域组织较为疏松。所有涂层均出现了分解与脱碳,涂层越厚分解越严重,出现的W_2C和Co_3W_3C相越多。
The WC-12C0 coating was prepared by HVOF. The primary coating was micro-nano composite powder. The coating thickness was 0.5, 1, 2, 3 and 4 mm respectively. The microstructure and phase composition of the coating were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The porosity of the coating was measured. The results show that the thickness has no significant effect on the surface morphology and surface roughness of the coating, but has a significant effect on the microstructure of the coating. The thickness of the coating less than 1 mm in thickness changes little in the thickness direction, while the thickness In the middle of the coating larger than 1 mm, the microstructure of the coating is relatively dense and the porosity is small. The bonding between the coating and the substrate and the tissue in the near surface area are relatively loose. All the coatings showed decomposition and decarburization, and the thicker the coatings were, the more serious the decomposition was. The more W_2C and Co_3W_3C phases appeared.