激光熔覆对Cu抗烧蚀性能的影响

Effect of Laser Cladding on Electric Erosive Resistance of Copper Alloy

应用激光熔覆法使Ti粉和B4C粉在铜基体表面发生原位反应形成了熔覆层,通过XRD分析确定了熔覆层相组成为TiB2/Cu。熔覆层试样和纯Cu的抗电弧烧蚀实验在自制设备上进行,并采用SEM观察了电弧烧蚀表面的形貌。研究结果表明,随着电弧烧蚀次数的增加,熔覆层试样表面电弧烧蚀和氧化现象并不明显,烧蚀孔洞少且小,没有液态金属喷溅现象;而纯铜试样表面变得较为粗糙,电弧作用的中心处烧蚀氧化严重,有大量的烧蚀坑存在,并且出现液态金属飞溅现象。因此,相对纯铜,TiB2/Cu复合涂层电弧烧蚀显著降低,抗电弧烧蚀性能明显提高。

In the present paper, the laser cladding was successfully used to make the Ti, B4C powders in-situ synthesize the composite coating on the surface of pure copper substrate. The phase composition of the composite coating was confirmed to be TiB2/Cu by X-ray diffraction （XRD）. The arc erosion resistance of the samples with the composite coating and pure copper was measured on the home-made arc erosion device. The morphology of the arc erosion surface was observed by using scanning electronic microscope （SEM）. The experimental results show the arc erosion and oxidation of the samples with the composite coating is not obviously with an increase of arc erosion time. Compared with the surface of pure copper, the erosion holes number of the samples with the composite coating is fewer, and the dimension of the holes is smaller. Therefore, the erosive degree of the laser cladding samples is weaker than that of pure copper, and the electric erosive resistance of TiB2/Cu composite coating is improved obviously.