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FeNiBSiCe喷熔层微动磨损特性

Fretting wear behaviour of FeNiBSiCe alloy flame sprayed coatings

  • 摘要: 利用氧乙炔火焰喷熔方法在45号钢表面制取了FeNiBSiCe喷熔层,在SRV球盘摩擦磨损试验机上研究了FeNiBSiCe合金的摩擦磨损行为,用扫描电子显微镜(SEM)、场发射扫描电镜(FEGSEM)和能量色散谱仪(EDS)等技术分析了喷熔层的表面、截面及磨损面形貌。结果表明,FeNiBSiCe喷熔层的耐磨性优于SAE52100钢,喷熔层磨损率随滑动速度增加,先快速降低,随后趋于缓慢,最后上升。摩擦系数随滑动速度的增大而增加,然后趋于稳定。磨损机理是低载荷下为微观切削和疲劳脱层,在相对高载荷下和滑动速度较高时产生显微裂纹,且在涂层表面形成了一层氧化物磨屑层,缓解了微动磨损。

     

    Abstract: The fretting wear properties of FeNiBSiCe alloy coatings coupling with SAE52100 steel under reciprocating sliding were examined by using a ball-on-disc reciprocating tribotester.Effects of load and sliding speed on fretting tribological properties of the coatings were studied.Worn surfaces of the coatings were analyzed by a scanning electron microscopy (SEM), a field emission scanning electron microscopy (FESEM) and energy dispersive spectroscopy (EDS), respectively.The friction coefficient of the coatings decreased slightly with the load, but increased with sliding speed at first, and then tended to be a constant value.The wear rate of the coatings increased with the load, but dramatically decreased at first and then slightly decreased with the sliding speed.An adhered oxide debris layerwas formed on the worn surface in friction.Fretting wear mechanism of the coatings was microplough at normal load, microfracture, oxidation wear and a large amount of counterpart material was transferred to the coatings at high load and high sliding speed.

     

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