ABSTRACT

In this research, both eco-friendly and commercially available dielectric liquid (EDM oil, EDM oil + MoS₂ powders (EDP), Sunflower oil (SF), and Sunflower oil + MoS₂ powders (SFP)) was adopted to carry out the small area surface modification on Ti6Al4V sheet through the micro-EDM process. Brass rod (diameter: 0.95 mm) was used as the micro-tool electrode. The quality (surface roughness (Ra, Rq, Rz), recast layer (or coating) thickness (RLT), and the micro-hardness (MH)) of the coated surfaces was tested and compared with the change of input process parameters and dielectrics. The results indicate that the maximum micro-hardness of the coated layer for differently used dielectric mediums such as EDM oil, SF oil, EDP oil, and SFP oil is 495.9 HV, 619.05 HV, 665.42 HV, and 694.02 HV, respectively. Similarly, the coated layer thickness varies within the range of 4.56 to 24.42 μm (EDM oil), 7.24 to 28.31 μm (SF oil), 5.42 to 26.84 μm (EDP oil), and 4.66 to 32.75 μm (SFP oil). EDX plots suggest transfer of tool and the dielectric material (Ti, V, Al, C, Cu, Zn, Mo, S) to the substrate surface.

摘要

在这项研究中，环保和市售的介电液体（EDM 油、EDM 油 + MoS ₂粉末 (EDP)、葵花油 (SF) 和葵花油 + MoS ₂采用粉末（SFP））通过微电火花加工对Ti6Al4V片材进行小面积表面改性。黄铜棒（直径：0.95 mm）用作微型工具电极。测试涂层表面的质量（表面粗糙度（Ra、Rq、Rz）、重铸层（或涂层）厚度（RLT）和显微硬度（MH）），并与输入工艺参数和电介质的变化进行比较. 结果表明，对于EDM油、SF油、EDP油和SFP油等不同用途的介电介质，涂层的最大显微硬度分别为495.9 HV、619.05 HV、665.42 HV和694.02 HV。类似地，涂层厚度在 4.56 至 24.42 μm（EDM 油）、7.24 至 28.31 μm（SF 油）、5.42 至 26.84 μm（EDP 油）和 4.66 至 32.75 μm（SFP 油）的范围内变化。