钛合金表面电火花原位沉积TiC颗粒强化层的组织与硬度

Microstructure and Microhardness of TiC Particles Reinforced Coating In-situ Deposited on Titanium Alloy Surface by Electrospark Process

摘要: 以石墨为电极, 采用电火花沉积工艺在BT20钛合金表面沉积了TiC颗粒得到了强化层, 并对该强化层的组织和硬度进行了研究。结果表明: 强化层分布不连续, 厚度也不均匀, 最厚处可达30 μm, 最薄处还不到10 μm; 强化层中TiC颗粒的分布不均匀, 大量TiC聚集于强化层表面, 内部很少, 这使得强化层表面硬度达到了基体的5倍以上。

Abstract: Taking the graphite as electrode, TiC particles were deposited on BT20 titanium alloy surface by eletrospark processing to form a reinforced coating. The microstructure and microhardness of the coating were studied. The results show that the coating was discontinuous and uneven with the thickness of 10-30 μm. The distribution of TiC particles in the reinforced coating was non-uniform, most of TiC existed on the reinforced coating surface and a little inside of the reinforced coating, which made the microhardness of the reinforced coating 4 times higher than that of the titanium alloy substrate.