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首页> 外文期刊>CERAMICS INTERNATIONAL >Tribological behavior of nanostructured high velocity oxy-fuel (HVOF) thermal sprayed WC-17NiCr coatings
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Tribological behavior of nanostructured high velocity oxy-fuel (HVOF) thermal sprayed WC-17NiCr coatings

机译：纳米结构高速氧燃料（HVOF）热喷涂WC-17NICR涂料的摩擦学行为

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摘要

In this research, the nanostructured WC-17NiCr cermet coatings were developed using the high velocity oxyfuel (HVOF) thermal spraying processes on ACI CD4MCu cast duplex stainless steel substrates, widely used in pump industry for abrasive wear protection of surfaces. The coatings, sprayed by both robotic and manual methods, had two different fuel (methane) to oxygen ratios (FTOR), namely 0.68 and 0.62. Using different analytical and microstructural techniques, the microstructural characteristics of the powder particles and mechanical, microstructural, and tribological properties of the coatings were determined. Different morphologies were assigned to sprayable particles, namely spherical, apple, donut, irregular, and mixed. It was revealed that the rate of WC decarburization had increased with increasing the FTOR. In contrast, the scanning electron microscopy and image analyses showed that the lowest porosity percentage was obtained for the robotically-sprayed coating with 0.68 FTOR. The Vickers microhardness increased along with fracture toughness, which can be attributed to the effect of the 'duplex structure' associated with the particle outer coating of Co and is a novelty in the research. The pin-on-disk reciprocal sliding wear tests at various loadings had shown different wear rates in the coatings. It was inferred that the wear performance was improved with the microstructural homogeneity, hardness, and the fracture toughness in the coatings. In all coatings, lower coefficient of friction (COF) was observed at higher loads. Finally, the wear mechanisms involved in the wear processes were identified as deformation and removal of the binder, fracture and pullout of the carbide particles, and delamination and spallation of the splats.
机译：在该研究中，纳米结构WC-17NiCR Cermet涂料是使用ACI CD4MCCU铸造双相不锈钢基板上的高速氧氟丝（HVOF）热喷涂工艺开发，广泛应用于泵行业的磨损磨损保护。通过机器人和手动方法喷涂的涂层具有两种不同的燃料（甲烷）至氧比（FTOR），即0.68和0.62。使用不同的分析和微观结构技术，测定粉末颗粒的微观结构特性和涂层的机械，微观结构和摩擦学性质。将不同的形态分配给可喷雾的颗粒，即球形，苹果，甜甜圈，不规则和混合。据透露，WC脱碳率随着越来越多的对手而增加。相反，扫描电子显微镜和图像分析表明，具有0.68英尺的机器人喷涂的涂层获得最低孔隙率百分比。维氏微硬度随着断裂韧性而增加，这可以归因于“双工结构”与CO的颗粒外涂层相关的影响，并且是研究中的新颖性。各种载荷处的磁盘上倒数往复滑动磨损试验在涂层中显示出不同的磨损率。推测，随着微观结构的均匀性，硬度和涂层中的断裂韧性提高了磨损性能。在所有涂层中，在较高载荷下观察到较低的摩擦系数（COF）。最后，涉及磨损过程中涉及的磨损机制被鉴定为变形和去除碳化物颗粒的粘合剂，裂缝和拉出，以及Splats的分层和剥落。

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