The study of Cr3C2-25NiCr and 35WC-Co/65NiCrBSi-based HVOF coatings for high-temperature erosion resistance application

IF 1.6 Q4 MATERIALS SCIENCE, COATINGS & FILMS Tribology - Materials, Surfaces & Interfaces Pub Date : 2021-08-13 DOI:10.1080/17515831.2021.1951542

K. Raghavendra Naik, R. kumar, V. Saravanan, S. Seetharamu, P. Sampathkumaran

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引用次数: 2

Abstract

ABSTRACT This work concerns a technique to produce thermal sprayed coatings using HVOF (high-velocity oxy-fuel) method as it is a widely used application in high-temperature erosion and corrosion environment. Two types of hard coatings Cr3C2-25NiCr and 35WC-Co/65NiCrBSi were sprayed on an SS-347 steel substrate. The erosion tests were done using high-temperature jet erosion set up to study the effect of velocity, temperature and impact angles on the coatings produced. The surface morphology of the samples was characterized using 3D laser confocal microscopy, light microscopy, scanning electron microscopy with EDAX and X-ray diffraction. Microhardness, porosity level and roughness parameters were evaluated to infer a probable mechanism of material removal. The Cr3C2-25NiCr coating exhibited ∼3.3 times higher erosion resistance than 35WC-Co/65NiCrBSi coating at 90° and 30° impact angles. SEM and 3D laser confocal images on the eroded surface of the coatings reveal the combination of ductile and brittle fracture of coating. GRAPHICAL ABSTRACT

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Cr3C2-25NiCr和35WC-Co/65NiCrBSi基高温耐磨HVOF涂层的研究

本工作涉及一种使用HVOF（高速氧燃料）法生产热喷涂涂层的技术，因为它在高温侵蚀和腐蚀环境中有着广泛的应用。在SS-347钢基体上喷涂了两种类型的硬质涂层Cr3C2-25NiCr和35WC-Co/65NiCrBSi。采用高温射流烧蚀装置进行了烧蚀试验，研究了速度、温度和冲击角对涂层性能的影响。使用3D激光共聚焦显微镜、光学显微镜、EDAX扫描电子显微镜和X射线衍射对样品的表面形态进行了表征。对显微硬度、孔隙率水平和粗糙度参数进行了评估，以推断材料去除的可能机制。在90°和30°冲击角下，Cr3C2-25NiCr涂层的耐腐蚀性是35WC-Co/65NiCrBSi涂层的约3.3倍。涂层侵蚀表面的扫描电镜和三维激光共聚焦图像揭示了涂层的韧性和脆性断裂相结合。图形摘要

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来源期刊

Tribology - Materials, Surfaces & Interfaces MATERIALS SCIENCE, COATINGS & FILMS-

CiteScore

2.80

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0.00%

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