Study of the Influence of Coating Roughness on the Properties and Wear Resistance of Electrospark Deposited Ti6Al4V Titanium Alloy

Q3 Engineering

Tribology in Industry Pub Date : 2024-03-01 DOI:10.24874/ti.1508.06.23.08

T. Penyashki, Georgi Kostadinov, M. Kandeva, A. Nikolov, Rayna Dimitrova, V. Kamburov, Pancho Danailov, S. Bozhkov

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引用次数: 0

Abstract

The present work is concerned with studying surface parameters of coatings deposited to titanium alloy Ti6Al4V by electrospark deposition (ESD) with hard alloy depositing electrodes based on WC, TiC and TiCN. The variation of roughness parameters, composition, structure and tribological characteristics of coatings as a function of ESD mode parameters was investigated. The influence of the mode parameters on the main coating roughness parameters (Ra, Rz, Rmax, Rpk, Rk, Rs, Rsk, Rku (ISO 21920-2:2021) was analysed, the values of which can be used to determine the load bearing capacity and wear resistance. The results of the tribological tests showed that within the test range, the roughness of the coatings has a controversial influence on their frictional wear performance. As the roughness parameters increase to Ra=3÷3.5 µm, the relative wear resistance of the coated surfaces also increases, reaching values up to 4÷5 µm for the electrodes used and no significant changes in the wear mechanism were observed. However, increasing coating roughness above Ra=3.5 to 5 µm results in a monotonic decrease in relative wear resistance to 2.5÷3 times. Possible ways to reduce the surface roughness and increase the wear resistance of coatings were presented.

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涂层粗糙度对电火花沉积 Ti6Al4V 钛合金性能和耐磨性的影响研究

目前的研究工作是通过电火花沉积（ESD）技术，使用基于 WC、TiC 和 TiCN 的硬质合金沉积电极，对钛合金 Ti6Al4V 沉积涂层的表面参数进行研究。研究了涂层的粗糙度参数、成分、结构和摩擦学特性随 ESD 模式参数的变化。分析了模式参数对主要涂层粗糙度参数（Ra、Rz、Rmax、Rpk、Rk、Rs、Rsk、Rku（ISO 21920-2:2021））的影响，其值可用于确定承载能力和耐磨性。摩擦学测试结果表明，在测试范围内，涂层的粗糙度对其摩擦磨损性能的影响具有争议性。当粗糙度参数增加到 Ra=3÷3.5 µm 时，涂层表面的相对耐磨性也随之增加，所用电极的数值最高可达 4÷5 µm，并且没有观察到磨损机理发生显著变化。然而，将 Ra=3.5 以上的涂层粗糙度增加到 5 µm 时，相对耐磨性会单调地降低到 2.5 至 3 倍。介绍了降低表面粗糙度和提高涂层耐磨性的可行方法。

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

Tribology in Industry Engineering-Mechanical Engineering

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

8 weeks

期刊介绍： he aim of Tribology in Industry journal is to publish quality experimental and theoretical research papers in fields of the science of friction, wear and lubrication and any closely related fields. The scope includes all aspects of materials science, surface science, applied physics and mechanical engineering which relate directly to the subjects of wear and friction. Topical areas include, but are not limited to: Friction, Wear, Lubricants, Surface characterization, Surface engineering, Nanotribology, Contact mechanics, Coatings, Alloys, Composites, Tribological design, Biotribology, Green Tribology.