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

IF 4.2 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2024-11-07 DOI:10.1016/j.ijrmhm.2024.106955

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

引用次数: 0

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 × 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.

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纳米金刚石复合超硬涂层在干燥条件下对 Al2O3 对抗体的耐磨性和低摩擦稳定性

传统的机加工润滑剂会对环境造成危害并增加生产成本。为了应对这一挑战，本研究将沉积在 WC-Co 基底上的纳米金刚石复合材料 (NDC) 涂层作为可持续加工的无润滑剂替代品进行了研究。与基底（22 GPa）相比，NDC 薄膜显示出更高的硬度（65 GPa）和更强的附着力（HF2）。NDC 独特的自润滑特性使其摩擦系数低且稳定（COF ≤ 0.095），在与 Al2O3 对体的干燥测试中具有优异的耐磨性（7.45 × 10-8 mm3/N-m）。与 CVD 金刚石相比，NDC 涂层的 COF 降低了 47.8%，耐磨性提高了 31.65%，促进了环保型加工实践。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.