Unveiling the durability, friction, and wear behaviour of nanodiamond composite films deposited on biased cemented carbide with varying Al interlayer thickness

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces Pub Date : 2025-04-03 DOI:10.1016/j.surfin.2025.106367

Mohamed Ragab Diab , Koki Murasawa , Mei Wang , Shinya Ohmagari , Hiroshi Naragino , Tsuyoshi Yoshitake , Mohamed Egiza

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引用次数: 0

Abstract

Nanodiamond composite (NDC) films were deposited on biased cemented carbide (WC−6 wt. % Co) substrates using a coaxial arc plasma deposition technique, incorporating sputtered aluminium (Al) interlayers with varying thicknesses (0,50, 100, 300, and 500 nm). This study systematically investigates the durability, friction, and wear behaviour of NDC films, focusing on optimizing Al interlayer thickness to enhance performance in dry and harsh machining conditions. The primary objective was to mitigate interfacial catalytic reactions, particularly Co-induced graphitization, which adversely affect adhesion and mechanical integrity. Experimental findings identified a 100 nm Al interlayer as the optimal configuration, forming a protective Al₂O₃ layer that effectively suppressed graphitization. This resulted in significant improvements in coating performance, including a 79 % increase in adhesion strength, as indicated by a critical load of 17 N for full spallation during scratch testing, and a 62 % enhancement in wear resistance, yielding a wear rate of 7.85 × 10⁻⁸ mm³/N.m. Simultaneously, the coefficient of friction (COF) decreased by 71 % compared to the uncoated substrate, maintaining a stable value of 0.09 during dry sliding tests against a rough Al₂O₃ counterpart. The exceptional tribological performance of the optimized NDC coatings is attributed to multiple factors. The refined nanostructure, featuring a dense grain boundary network, facilitated the formation of a lubricating graphitic layer, contributing to low and stable friction. Additionally, the high hardness (75 GPa) and Young's modulus (724 GPa) provided superior wear resistance and load-bearing capacity. These results underscore the potential of Al interlayers to significantly enhance the tribological performance of NDC coatings. However, the improvements in durability remain limited by the low adhesion strength, which remains a critical factor for cutting tools operating under dry machining conditions.

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揭示了在偏置硬质合金上沉积具有不同Al层厚度的纳米金刚石复合膜的耐久性、摩擦和磨损行为

采用同轴电弧等离子沉积技术在偏置硬质合金（WC - 6 wt. % Co）衬底上沉积纳米金刚石复合材料（NDC）薄膜，并结合不同厚度（0、50、100、300和500 nm）的溅射铝（Al）中间层。本研究系统地研究了NDC薄膜的耐久性、摩擦和磨损行为，重点是优化Al层间厚度，以提高在干燥和恶劣加工条件下的性能。主要目的是减轻界面催化反应，特别是共诱导石墨化，这对附着力和机械完整性有不利影响。实验发现，100 nm的Al夹层是最佳配置，形成了有效抑制石墨化的保护性Al₂O₃层。这使得涂层性能得到了显著改善，包括附着力提高了79%，如划痕测试中完全剥落的临界载荷为17 N所示，耐磨性提高了62%，磨损率为7.85 × 10−8 mm³/N.m。同时，与未涂覆的基材相比，摩擦系数（COF）下降了71%，在与粗糙的Al₂O₃基材进行干滑动测试时，保持了0.09的稳定值。优化后的NDC涂层的优异摩擦学性能归因于多种因素。精细的纳米结构，具有致密的晶界网络，有利于润滑石墨层的形成，有助于低而稳定的摩擦。此外，高硬度（75 GPa）和杨氏模量（724 GPa）提供了卓越的耐磨性和承载能力。这些结果强调了Al中间层显著提高NDC涂层摩擦学性能的潜力。然而，耐久性的提高仍然受到粘附强度低的限制，这仍然是切削刀具在干式加工条件下工作的关键因素。

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来源期刊

Surfaces and Interfaces Chemistry-General Chemistry

CiteScore

8.50

自引率

6.50%

发文量

753

审稿时长

35 days

期刊介绍： The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)