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首页> 外文期刊>Surface & Coatings Technology >Feasibility of preparing Mo2FeB2-based cermet coating by electrospark deposition on high speed steel
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Feasibility of preparing Mo2FeB2-based cermet coating by electrospark deposition on high speed steel

机译：在高速钢上通过电火花沉积制备Mo2FeB2基金属陶瓷涂层的可行性

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摘要

In this study, Mo2FeB2-based cermet coating has been attempted to produce by electrospark deposition (ESD) process on a high speed steel substrate. Microstructural morphology, elementary distribution, phase constitute, microhardness, and wear resistance of the coating were investigated by scanning electron microscopy (SEM), electron probe microanalysis (EPMA), X-ray diffraction (XRD), microhardness measurement and tribological test. The SEM and EPMA results show that the coating is dense, metallurgically bonded to the substrate, and has an average thickness of 48.1 mu m. Moreover, a discernible composition transition zone appeared between the coating and the substrate. The XRD patterns reveal a microstructural transformation from Mo2FeB2 phase and binder phase (ferrite) of the cermet to amorphous phase and martensitic phase of the coating during the deposition, and the martensitic phase has nanocrystalline structure (31.7 nm). Such microstructure of the coating results in higher microhardness, lower friction coefficient, and better wear resistance than the high speed steel substrate. The main wear types for the coating are abrasive wear and fatigue wear. (C) 2016 Elsevier B.V. All rights reserved.
机译：在这项研究中，已尝试通过电火花沉积（ESD）工艺在高速钢基材上生产基于Mo2FeB2的金属陶瓷涂层。通过扫描电子显微镜（SEM），电子探针显微分析（EPMA），X射线衍射（XRD），显微硬度测量和摩擦学试验研究了涂层的显微组织形态，元素分布，相组成，显微硬度和耐磨性。 SEM和EPMA结果表明该涂层致密，冶金结合到基底上，平均厚度为48.1μm。此外，在涂层和基材之间出现了可辨别的组成过渡区。 XRD图谱显示了在沉积期间从金属陶瓷的Mo2FeB2相和粘合剂相（铁素体）到涂层的非晶相和马氏体相的微观结构转变，并且马氏体相具有纳米晶体结构（31.7nm）。涂层的这种微观结构导致比高速钢基材更高的显微硬度，更低的摩擦系数和更好的耐磨性。涂层的主要磨损类型是磨料磨损和疲劳磨损。 （C）2016 Elsevier B.V.保留所有权利。

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