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首页> 外文期刊>Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear >Sliding wear behavior of Fe-Al and Fe-Al/WC coatings prepared by high velocity arc spraying
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Sliding wear behavior of Fe-Al and Fe-Al/WC coatings prepared by high velocity arc spraying

机译：高速电弧喷涂制备的Fe-Al和Fe-Al / WC涂层的滑动磨损行为

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摘要

A comparative study was carried out to investigate the microstructure and tribological behavior of Fe-Al and Fe-Al/WC iron aluminide based coatings against SisN4 under dry sliding at room temperature using a pin-on-disc tribotester. The coatings were prepared by high velocity arc spraying (HVAS) and cored wires. The effect of normal load on friction coefficient and wear rate of the coatings was studied. The microstructure and the worn surfaces of the coatings were analysed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersion spectroscope (EDS). The results showed that, the main phases in both coatings were iron aluminide (Fe{sub}3Al and FeAl) and α. WC/W{sub}2C particles were embedded in the matrix of the composite coating. With adding WC hard particles, the Fe-Al/WC composite coating exhibited higher wear-resistance than Fe-Al coating. But the friction coefficient of both coatings showed little difference. As the load increased, the friction coefficient decreases slightly due to a rise of friction contact temperature and larger areas of oxide film formation on the worn surface, which act as a solid lubricant. Increasing load causes the maximum shear stress occurring at the deeper position below the surface, thereby aggravating the wear. The coating surface is subjected to alternately tensile stress and compression stress during sliding, and the predominant wear mechanism of the coatings appears to be delamination.
机译：进行了一项对比研究，研究了在室温下使用针盘式三硼酸酯，Fe-Al和Fe-Al / WC铝化铁基涂层对SisN4的显微结构和摩擦学行为。通过高速电弧喷涂（HVAS）和芯线制备涂层。研究了法向载荷对涂层摩擦系数和磨损率的影响。通过X射线衍射（XRD），扫描电子显微镜（SEM）和能谱仪（EDS）分析了涂层的微观结构和磨损表面。结果表明，两种涂层的主要相均为铝化铁（Fe {sub} 3Al和FeAl）和α。 WC / W {sub} 2C颗粒嵌入复合涂层的基质中。添加WC硬质颗粒后，Fe-Al / WC复合涂层比Fe-Al涂层具有更高的耐磨性。但是两种涂层的摩擦系数差异很小。随着载荷的增加，由于摩擦接触温度的升高和在磨损表面上形成的较大面积的氧化膜（起固体润滑剂作用），摩擦系数会略有下降。负荷增加会在表面以下的较深位置产生最大的剪应力，从而加剧磨损。在滑动过程中，涂层表面交替承受拉应力和压缩应力，涂层的主要磨损机理似乎是分层。

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