Investigating the microstructure and high-temperature wear resistance of TiAl/WC coating modified via scanning electron beam

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

Surface & Coatings Technology Pub Date : 2024-10-30 DOI:10.1016/j.surfcoat.2024.131479

Yitao Weng , Rong Wang , Xinmeng Sui , Zhenfei Song , Kai Wang , Zhenzhao Mo , Fengtao Yang , Xiangbiao Huang , Xulong Ren

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Abstract

In this study, TiAl/WC cladding coatings were modified to improve high-temperature wear resistance by scanning electron beam treatment. Results of the microstructure reveal that the modified coatings are composed of an α₂-Ti₃Al matrix, with a high density of TiC reinforced phase and Ti₃AlC₂ MAX phase. At a scanning speed of 6 mm/s, TiAl/WC coating exhibits superior microhardness and high-temperature wear resistance. After the wear test at 800 °C, the minimum wear volume of modified TiAl/WC coating is 0.084 mm³, which is 4.47 times smaller than that of the TC21 substrate. It is mainly attributed to the dense and uniform distribution of hard TiC with a rigid supporting role and Ti₃AlC₂ MAX phases with a self-lubricating effect. Furthermore, due to the effect of frictional heat, the decomposition of Ti₃AlC₂ promoted the formation of a dense Al₂O₃ protective film. The wear mechanism of modified TiAl/WC coatings exhibits a synergistic occurrence of slight adhesive wear, abrasive wear, and oxidative wear. Scanning electron beam technology shows significant potential for extending the service life of the coatings in high-temperature environments.

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研究通过扫描电子束改性的 TiAl/WC 涂层的微观结构和高温耐磨性

本研究通过扫描电子束处理对 TiAl/WC 覆层涂层进行改性，以提高其高温耐磨性。微观结构结果表明，改性涂层由 α2-Ti3Al 基体、高密度的 TiC 增强相和 Ti3AlC2 MAX 相组成。在 6 mm/s 的扫描速度下，TiAl/WC 涂层显示出优异的显微硬度和高温耐磨性。在 800 °C 下进行磨损测试后，改性 TiAl/WC 涂层的最小磨损体积为 0.084 mm3，是 TC21 基体的 4.47 倍。这主要归功于具有刚性支撑作用的硬质 TiC 和具有自润滑作用的 Ti3AlC2 MAX 相的致密均匀分布。此外，由于摩擦热的作用，Ti3AlC2 的分解促进了致密 Al2O3 保护膜的形成。改性 TiAl/WC 涂层的磨损机理表现出轻微粘着磨损、磨料磨损和氧化磨损的协同作用。扫描电子束技术在延长高温环境下涂层的使用寿命方面显示出巨大的潜力。

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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.