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<p>The electric discharge coating process was adopted to enhance the tribological properties of the material. In this work, the Al-7075 surface was modified using powder metallurgy copper/multi-walled carbon nanotube (Cu-MWCNT) green compact tool electrode in reverse polarity. The influence of process parameters such as peak current (<i>I</i><sub>p</sub>), voltage (<i>V</i>), and pulse on-time (<i>T</i><sub>on</sub>) on material deposition rate (MDR) and surface roughness (<i>R</i><sub><i>a</i></sub>) was studied. Maximum MDR of 1.30&#xa0;mg/min and minimum <i>R</i><sub><i>a</i></sub> of 3.01&#xa0;µm were obtained. The surface contact angle was found to be increased from 95.30° (base) to 147.30° (coating). Characterizations confirmed the presence of tool materials in the modified surface. The coated surface exhibited a lower wear rate than the base material, and a reduction in friction coefficient from 0.64 (base) to 0.34 (coating) was observed. Porosity analysis revealed that surface coated with high <i>I</i><sub>p</sub> settings exhibits increased porosity compared to those coated with low <i>I</i><sub>p</sub> settings.</p> Graphical Abstract <p></p>

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Experimental Investigation on the Integrity of Surfaces Prepared using Copper/Multi-walled Carbon Nanotube Green Compact Tool in Electric Discharge Coating Process

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • Bhargab Madhab Barua,
  • Maneswar Rahang

摘要

The electric discharge coating process was adopted to enhance the tribological properties of the material. In this work, the Al-7075 surface was modified using powder metallurgy copper/multi-walled carbon nanotube (Cu-MWCNT) green compact tool electrode in reverse polarity. The influence of process parameters such as peak current (Ip), voltage (V), and pulse on-time (Ton) on material deposition rate (MDR) and surface roughness (Ra) was studied. Maximum MDR of 1.30 mg/min and minimum Ra of 3.01 µm were obtained. The surface contact angle was found to be increased from 95.30° (base) to 147.30° (coating). Characterizations confirmed the presence of tool materials in the modified surface. The coated surface exhibited a lower wear rate than the base material, and a reduction in friction coefficient from 0.64 (base) to 0.34 (coating) was observed. Porosity analysis revealed that surface coated with high Ip settings exhibits increased porosity compared to those coated with low Ip settings.

Graphical Abstract