The influence of the H/E ratio on wear resistance of coating systems – Insights from small-scale testing

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2022-07-25 DOI:10.1016/j.surfcoat.2022.128272

Ben D. Beake

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引用次数: 58

Abstract

The limit of applicability of the correlation between the ratio of hardness to elastic modulus (H/E) of coating systems and their wear resistance has been explored. Experimental approaches to determine accurate H/E values by nanoindentation are discussed and best practice recommendations summarised. Small-scale tribo-testing has been used to simplify complex wear conditions, and the role of contact severity and damage tolerance studied to determine why and when coating optimisation strategies are effective. Case studies show the importance of relatively low coating elastic modulus in reducing tensile stresses in sliding/abrasive contact. This may be a key factor in why coating design for optimised H/E and resistance to plastic deformation, H³/E², can be more effective than aiming for extremely high coating hardness since that is typically accompanied by high coating stiffness. The influence of substrate ductility and load support on the damage tolerance of the coating system in impact tests has been investigated by testing at different contact size. Results show that mechanical and microstructural factors should not be considered in isolation. The role of coating microstructural design and temperature on optimising coating performance in high speed machining is investigated.

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H/E比对涂层系统耐磨性的影响——来自小规模测试的见解

探讨了涂层硬度与弹性模量之比(H/E)与涂层耐磨性相关性的适用范围。讨论了通过纳米压痕确定精确H/E值的实验方法，并总结了最佳实践建议。小型摩擦测试已被用于简化复杂的磨损条件，并研究了接触严重程度和损伤容限的作用，以确定涂层优化策略有效的原因和时间。案例研究表明，相对较低的涂层弹性模量对于降低滑动/磨料接触中的拉伸应力非常重要。这可能是优化H/E和抗塑性变形(H3/E2)的涂层设计比瞄准极高的涂层硬度更有效的关键因素，因为后者通常伴随着高涂层刚度。通过不同接触尺寸的冲击试验，研究了基体延展性和载荷支撑对涂层系统损伤容限的影响。结果表明，力学和微观结构因素不应孤立考虑。研究了涂层组织设计和温度对高速加工中涂层性能优化的影响。

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

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.