Novel Liquid Fuel HVOF Torches Fueled with Ethanol: Optimization and Erosion Wear Response of Cr3C2-NiCr Coatings

热喷涂技术 Pub Date : 2021-06-15 DOI:10.31399/asm.cp.itsc2021p0079

Shaowu Liu, M. Molière, H. Liao

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引用次数: 1

Abstract

In this work; a novel liquid fuel HVOF process fueled with ethanol was used to prepare 75wt%Cr3C2–25wt%NiCr coatings on AISI304 stainless steel substrate. Taguchi method was employed to optimize the spray parameters (ethanol flow rate; oxygen flow rate; powder feed rate and standoff distance) to achieve better erosion resistance at 90° impact angle. The results indicated that ethanol flow rate and oxygen flow rate were identified as the highly contributing parameters on the erosion wear loss. The important sequence of the spray parameter is ethanol flow rate > oxygen flow rate > standoff distance > powder feed rate. The optimal spray parameter (OSP) for minimum erosion wear loss was obtained under ethanol flow rate of 28slph; oxygen flow rate of 420slpm; powder feed rate of 76.7 g/min and standoff distance of 300mm. The phase composition; microstructure; hardness; porosities; and the erosion wear behaviors of the coatings have been studied in detail. Besides; erosion wear testing of the optimized coating was conducted at 30°; 60° and 90° impact angle using air jet erosion testing machine. The SEM images of the erodent samples were taken to analyze the erosion mechanism.

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以乙醇为燃料的新型液体燃料HVOF火炬:Cr3C2-NiCr涂层的优化及冲蚀磨损响应

在这项工作中;采用以乙醇为燃料的新型液体燃料HVOF工艺，在AISI304不锈钢基体上制备了75wt% Cr3C2-25wt %NiCr涂层。采用田口法优化喷雾工艺参数(乙醇流速;氧流量;在90°的冲击角下，粉末的进给量和距离达到更好的抗侵蚀性。结果表明，乙醇流量和氧气流量是影响冲蚀磨损的重要参数。喷淋参数的重要顺序为乙醇流量>氧气流量>距离>进料量。在乙醇流量为28slph时，获得了最小冲蚀磨损的最佳喷淋参数(OSP);氧流量420slpm;给粉速度76.7 g/min，离粉距离300mm。相组成;微观结构;硬度;疏;并对涂层的冲蚀磨损行为进行了详细的研究。除了;对优化后的涂层进行了30°的冲蚀磨损试验;60°和90°冲击角采用空气射流冲蚀试验机。对侵蚀试样进行扫描电镜扫描，分析侵蚀机理。

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热喷涂技术

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722