Sliding wear behavior of Fe–Al and Fe–Al/WC coatings prepared by high velocity arc spraying
Sliding wear behavior of Fe–Al and Fe–Al/WC coatings prepared by high velocity arc spraying
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DOI：
10.1016/j.wear.2004.05.012
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发表时间：
2004-12
期刊：
影响因子：
5
通讯作者：
Binshi Xu;Z. Zhu;Shi-ning Ma;Wei Zhang;Wei-min Liu
中科院分区：
文献类型：
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作者：
Binshi Xu;Z. Zhu;Shi-ning Ma;Wei Zhang;Wei-min Liu
采用销-盘式摩擦磨损试验机研究了Fe-Al基涂层和Fe-Al/WC铁铝化物涂层在室温干摩擦条件下与Si3N4的摩擦学性能。涂层采用高速电弧喷涂和粉芯丝材制备。研究了法向载荷对涂层摩擦系数和磨损率的影响。利用X射线衍射仪（XRD）、扫描电镜（SEM）和能谱仪（EDS）对涂层的微观结构和磨损表面进行了分析。结果表明，两种涂层的主要相均为铁铝化物（Fe3Al和FeAl）和α相。WC/W2C颗粒嵌入涂层基体中。加入WC硬质颗粒后，Fe-Al/WC复合涂层的耐磨性明显高于Fe-Al涂层。但两种涂层的摩擦系数差异不大。随着载荷的增加，摩擦系数略有下降，这是由于摩擦接触温度的上升和磨损表面上形成的氧化膜的更大的区域，其充当固体润滑剂。载荷的增加导致最大剪应力发生在表面以下较深的位置，从而加剧磨损。涂层表面在滑动过程中受到拉应力和压应力的交替作用，涂层的主要磨损机制是分层。
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 Si3N4under 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 (Fe3Al and FeAl) and α. WC/W2C 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.