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采用粉末冶金法制备Zr B2-Ti B2复相材料熔敷棒,并通过电火花沉积工艺在铜电极表面制备Zr B2-Ti B2复相涂层。通过扫描电镜结合能谱分析研究了涂层的显微结构和元素分布,利用X射线衍射和显微硬度测试对涂层的物相组成与显微硬度进行检测。结果表明:直接熔敷Zr B2-Ti B2复相涂层致密性较差,且存在较多裂纹,与基体有明显分层,涂层物相为Cu、Zr B2和Ti B2;在预沉积Ni层(Ni层)上后沉积Zr B2-Ti B2,所得的多层涂层具有较好的致密性,且涂层与基体间无分层;中间层有Ti、Zr、Cu元素的扩散,说明涂层与基体为冶金结合;Zr B2-Ti B2复相涂层硬度为900 HV0.05稍高于多层涂层硬度(800 HV0.05)。
The Zr B2-Ti B2 composite coating rod was prepared by powder metallurgy and the Zr B2-Ti B2 composite coating was prepared on the copper electrode by EDM. The microstructure and elemental distribution of the coating were studied by SEM and EDS. The phase composition and microhardness of the coating were measured by X-ray diffraction and microhardness test. The results show that the compactness of the direct deposited ZrB2-TiB2 composite coating is poor, with more cracks and obvious delamination from the matrix. The coating phases are Cu, ZrB2 and TiB2. In the pre-deposited Ni ZrB2-TiB2 deposited on the layer (Ni layer), the resulting multi-layer coating has good compactness and no delamination between the coating and the substrate; the diffusion of the Ti, Zr and Cu elements in the middle layer shows that The coating is metallurgically bonded to the substrate; the hardness of the Zr B2-Ti B2 duplex coating is 900 HV0.05 slightly higher than that of the multilayer coating (800 HV0.05).