通过负极性电火花沉积在 Ti6Al4V 合金上获得的基于 TIB2 的硬质合金涂层的表面特性、性能和耐磨性

Q3 Engineering
T. Penyashki, Georgi Kostadinov, M. Kandeva, A. Nikolov, Rayna Dimitrova, V. Kamburov
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引用次数: 0

摘要

本研究探讨了在负极性条件下通过电火花沉积(ESD)改善钛合金 Ti6Al4V 表面性能的可能性。涂层是用 TiB2-TiAl 基硬合金电极与纳米级添加剂 NbC 和 ZrO2 沉积而成的。在低脉冲能量(0.01-0.07 J)的静电放电过程中,通过剖面测量法、金相分析法、XRD、SEM 和 EDS 方法研究了极性对涂层表面粗糙度、厚度、成分和结构的影响。在两种极性下,都获得了致密均匀的涂层,其粗糙度和厚度可通过改变静电放电模式在 Ra=1.5÷4.5 µm、d=6÷20 µm 和显微硬度 9 至 12 GPa 的范围内变化。研究发现,获得的负极性涂层更致密均匀,厚度更高,粗糙度更低,结构更精细,摩擦系数更低,可成功用于降低三维打印钛合金的表面粗糙度和缺陷。磨损和侵蚀磨损测试表明,两种极性下涂层钛合金表面的耐磨性都是基材的 2.2 至 3.5 倍。正极性沉积的涂层具有更高的耐磨损性,而负极性沉积的涂层则更耐侵蚀磨损。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Surface Characteristics, Properties and Wear Resistance OF TIB2 BASED Hard-Alloy Coatings Obtained by Electrospark Deposition at Negative Polarity on Ti6Al4V Alloy
In the present work, the possibilities of improving the surface properties of titanium alloy Ti6Al4V by electrospark deposition (ESD) at negative polarity were investigated. The coatings were deposited with a TiB2-TiAl-based hard-alloy electrode with nano-sized additives of NbC and ZrO2. The effect of polarity in ESD at low pulse energy (0.01-0.07 J) on the surface roughness, thickness, composition and structure of coatings was studied by profilometric, metallographic, XRD, SEM and EDS methods. In both polarities, dense and uniform coatings were obtained with roughness and thickness, which could be varied by changing the ESD modes within the range Ra=1.5÷4.5 µm, d= 6÷20 µm and microhardness from 9 to 12 GPa, respectively. It was found that the negative polarity coatings obtained are denser and uniform with higher thickness, lower roughness, finer structure, and lower coefficient of friction, and can be successfully used to reduce the surface roughness and defects of 3D printed titanium alloy. Abrasion and erosion wear tests showed that the wear resistance of coated titanium surfaces at both polarities was 2.2 to 3.5 times higher than that of the substrate. Coatings deposited in positive polarity demonstrated higher resistance to abrasive wear, while those in negative polarity are more resistant to erosive wear.
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来源期刊
Tribology in Industry
Tribology in Industry Engineering-Mechanical Engineering
CiteScore
2.80
自引率
0.00%
发文量
47
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.
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