Wear-resistant and stable low-friction nanodiamond composite superhard coatings against Al2O3 counter-body in dry condition.

Diab, Mohamed Ragab; Murasawa, Koki; Ibrahim, Ahmed Mohamed Mahmoud; Naragino, Hiroshi; Yoshitake, Tsuyoshi; Egiza, Mohamed

Abstract

Conventional machining lubricants pose environmental hazards and increase production costs. This study addresses this challenge by investigating nanodiamond composite (NDC) coatings deposited on WC–Co substrates as a lubricant-free alternative for sustainable machining. The NDC films show superior hardness (65 GPa) compared to the substrate (22 GPa) and enhanced adhesion (HF2). The NDC's unique self-lubrication results in a low and stable friction coefficient (COF ≤ 0.095) and exceptional wear resistance (7.45 x 10−8 mm3/N·m) in dry tesing against Al2O3 counter-body. Compared to CVD diamond, NDC coatings show a 47.8 % reduction in COF and a 31.65 % enhancement in wear resistance, promoting environmentally friendly machining practices.

Citation

DIAB, M.R., MURASAWA, K., IBRAHIM, A.M.M., NARAGINO, H., YOSHITAKE, T. and EGIZA, M. 2025. Wear-resistant and stable low-friction nanodiamond composite superhard coatings against Al2O3 counter-body in dry condition. International journal of refractory metals and hard materials [online], 126, article number 106955. Available from: https://doi.org/10.1016/j.ijrmhm.2024.106955

• Journal Article Type: Article
• Acceptance Date: Nov 4, 2024
• Online Publication Date: Nov 7, 2024
• Publication Date: Jan 31, 2025
• Deposit Date: Nov 7, 2024
• Publicly Available Date: Nov 7, 2024
• Journal: International journal of refractory metals and hard materials
• Print ISSN: 0263-4368
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 126
• Article Number: 106955
• DOI: https://doi.org/10.1016/j.ijrmhm.2024.106955
• Keywords: Hard carbon coatings; Arc plasma deposition; Wear resistance; Dry friction
• Public URL: https://rgu-repository.worktribe.com/output/2571709