ABSTRACT

The work aims to assess the influence of tool electrode material while surface modification of Ti-alloy through the micro-electrical discharge coating (μEDC) process. Brass and tungsten micro-tool (800 μm)are chosen based on their mechanical, thermal, and electrical properties to conduct the experiments at different coating criteria such as duty cycle, voltage, and powder (tungsten disulphide) concentration. Various performance indexes i.e., micro-hardness, surface roughness, and recast surface height, are evaluated. Energy-dispersive X-ray spectroscopy (EDX) recognizes the elemental presence on the recast zone formed over Ti-alloy. A comparative analysis of the surfaces generated using both thetools is carried out for their performance measurement. The modified samples’ hardness improved by twice the base material due to the formation of hard phases of tungsten and titanium, as affirmed by the EDX study. The results indicate that both the micro-tool electrodes’ mechanical, electrical, and thermal properties significantly affect the process parameters for surface alteration of Ti-alloy.

摘要

该工作旨在通过微放电涂层（μEDC）工艺评估工具电极材料对钛合金表面改性的影响。黄铜和钨微型工具 (800 μm) 根据其机械、热和电特性进行选择，以在不同的涂层标准（如占空比、电压和粉末（二硫化钨）浓度）下进行实验。评估各种性能指标，即显微硬度、表面粗糙度和重铸表面高度。能量色散 X 射线光谱 (EDX) 可识别在钛合金上形成的重铸区域上的元素存在。对使用这两种工具生成的表面进行比较分析以测量其性能。EDX 研究证实，由于钨和钛硬质相的形成，改性样品的硬度提高了两倍于母材。结果表明，微型工具电极的机械、电和热性能显着影响钛合金表面变质的工艺参数。