Microstructure and properties of Ni20Cr–MoS2 composite coating by subsonic flame spraying

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2024-07-05 DOI:10.1016/j.surfcoat.2024.131083

Kenan Yang , Haixin Li , Min Wei , Zhanyong Song , Xuefeng Li , Chuanyong Yu

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Abstract

In this study, a Ni20Cr–MoS₂ composite coating was fabricated using subsonic flame-spraying technology, and the effects of adding MoS₂ on the microstructure, mechanical properties, and tribological properties of the coating were studied. The microstructure analysis of the coatings revealed that the Ni20Cr and Ni20Cr-MoS₂ coatings prepared by subsonic flame spraying had fewer microscopic defects and significant particle flattening. After the addition of MoS₂, the porosity of the coating decreased, whereas its microhardness increased. The cohesive strength of the coating was measured using the scratch method, and it was found to be enhanced after the addition of MoS₂. Moreover, in the dry friction state, compared with the Ni20Cr coating, the Ni20Cr–MoS₂ coating performs better. At a load of 20 N, the friction and wear performances of the Ni20Cr–MoS₂ coating were the best, and the friction coefficient decreased by 11.63 %. Based on this, the relationships between the cohesive strength and tribological properties and between the wear mechanism and scratch mechanism of the coating are discussed.

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亚音速火焰喷涂 Ni20Cr-MoS2 复合涂层的微观结构与性能

本研究采用亚音速火焰喷涂技术制备了 Ni20Cr-MoS2 复合涂层，并研究了添加 MoS2 对涂层微观结构、机械性能和摩擦学性能的影响。涂层的微观结构分析表明，亚音速火焰喷涂制备的 Ni20Cr 和 Ni20Cr-MoS2 涂层的微观缺陷较少，颗粒扁平化明显。添加 MoS2 后，涂层的孔隙率降低，而显微硬度增加。使用划痕法测定了涂层的内聚强度，发现添加 MoS2 后涂层的内聚强度有所提高。此外，在干摩擦状态下，与 Ni20Cr 涂层相比，Ni20Cr-MoS2 涂层的性能更好。在负载为 20 N 时，Ni20Cr-MoS2 涂层的摩擦和磨损性能最好，摩擦系数降低了 11.63 %。在此基础上，讨论了涂层的内聚强度与摩擦学性能之间的关系，以及磨损机理与划痕机理之间的关系。

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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.