【摘要】 在CuCrZr电极表面通过电火花振动沉积制备了TiB2功能涂层,测试了功能涂层的显微形貌、物相、硬度以及界面元素分布。试验表明,TiB2涂层电极具有典型的电火花涂层结构,存在明显的元素互扩散,表明功能层与基体之间为冶金结合。但TiB2涂层结构不致密,存在裂纹和孔洞,硬度较低。随着电火花电容和电压的增加,涂层的硬度降低。元素扩散和涂层氧化的加剧,是导致涂层硬度降低的主要原因。由于基体Cu的气化、脆性剥落和熔敷棒的切削作用,沉积TiB2后基体质量反而降低。高电压下电火花沉积以及预涂敷Ni,都会导致基体质量降低更多。更多还原

【Abstract】 TiB₂ functional coating was prepared on surface of CuCrZr electrode by electrospark deposition（ESD）.Microstructure,phases,elements distribution and hardness of the coating were examined,respectively.The results indicate that the microstructure of TiB₂ coating is a typical one for ESD.The elements inter-diffusion at the interface demonstrates the metallurgical bonding between the coating and substrate.The nickel pre-coated TiB₂ coating is not dense and pores and crack is observed.Diffusion of elements titanium and copper and oxidation of TiB₂ become severe as the voltage and capacitance increase,which leads to hardness of the coating at high voltage and capacitance decreases.The mass of the electrodes after cladding with TiB₂ decreases as the pulse energy increases with the voltage increasing.Evaporating of copper and flaking of TiB₂ coating play the most important roles in the mass loss of the electrodes.Cutting of TiB₂ bar with high hardness to CuCrZr electrode rotated with high speed and pre-coated nickel are also responsible for the mass loss of the electrodes.更多还原