ABSTRACT

The present work emphasizes the fabrication of a series of V-groove channels utilizing electrical discharge machining using a pointed tungsten tool electrode. The prepared textured surface is tested for the shape of V-groove channel, wetting behavior, and tribological aspect. A decrease in shape error of V-groove channel is observed as the peak current increases from 4 A to 10 A due to an increase in discharge energy which functions as the melting or vaporizing of machined materials. The water contact angle decreases from 61.316⁰ (untextured surface) to 49.567⁰ (sample 4) showing an increase in hydrophilic behavior for the samples having nearly a V-groove-shaped channel. Further, there is a decrease in COF value from 0.48 (untextured surface) to 0.23 (sample 4). The decreased COF value attributes to the formation of metallic bridges in the V-groove channel. The prime wear mechanism for an untextured surface is found to be ploughing whereas adhesion with ploughing is dominant for textured surfaces.

摘要

目前的工作重点是利用尖头钨工具电极进行放电加工来制造一系列 V 形槽通道。测试制备的纹理表面的 V 型槽通道形状、润湿行为和摩擦学方面。随着峰值电流从 4 A 增加到 10 A，观察到 V 型槽通道的形状误差减小，这是由于放电能量的增加（其作用是加工材料的熔化或汽化）。水接触角从 61.316 ⁰（无纹理表面）减小到 49.567 ⁰(样品4)显示具有接近V形槽形通道的样品的亲水行为增加。此外，COF 值从 0.48（无纹理表面）降低至 0.23（样品 4）。COF 值降低归因于 V 型槽通道中金属桥的形成。研究发现，无纹理表面的主要磨损机制是犁耕，而犁耕粘附对于纹理表面来说是主要磨损机制。