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Micro-arc oxidation(MAO)coating was prepared on Ti6Al4V alloy surface and its characterizations were detected by Vickers hardness tester,profilometer,scanning electric microscope(SEM),energy dispersive X-ray spectrometer(EDX)and X-ray diffractometer(XRD).Fretting wear behaviors of the coating and its substrate were comparatively tested without lubrication under varied displacement amplitudes(D)in a range of 3-40μm,constant normal load(Fn)of 300 N and frequency of 5 Hz.The results showed that the MAO coating,presenting rough and porous surface and high hardness,mainly consisted of rutile and anatase TiO2 phases.Compared with the substrate,the MAO coating could shift the mixed fretting regime(MFR)and slip regime(SR)to a direction of smaller displacement amplitude.In the partial slip regime(PSR),lower friction coefficients and slight damage appeared due to the coordination of elastic deformation of contact zones.In the MFR,the friction coefficient of the coating was lower than that of the substrate as a result of the prevention of plastic deformation by the hard ceramic surface.With the increase of the displacement amplitude,the degradation of the MAO coating and the substrate increased extremely.The fretting wear mechanisms of the coating were abrasive wear and delamination with some material transfer of specimen.In addition,the coating presented a better property for alleviating fretting wear. 相似文献
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LZ50车轴钢转动微动摩擦学特性研究 总被引:2,自引:0,他引:2
在新型转动微动磨损试验机上,进行LZ50车轴钢/GCr15钢在法向载荷为10N、转动角位移幅值为0.125°~0.5°的转动微动磨损试验。在摩擦动力学行为分析的基础上,结合磨痕的微观分析,研究材料的转动微动磨损机理。结果表明,LZ50车轴钢的微动运行区域仅呈现部分滑移区和滑移区,未观察到混合区。滑移区的摩擦因数明显高于部分滑移区;摩擦因数随着转动角位移幅值的增加而增大。车轴钢在部分滑移区损伤轻微,磨痕呈环状;而在滑移区,接触中心呈现材料塑性流动累积造成"隆起"特征,LZ50钢的转动微动磨损机制主要为磨粒磨损、剥层和氧化磨损。 相似文献
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PMMA转动微动摩擦学行为的研究 总被引:1,自引:0,他引:1
在新型转动微动试验机上,进行了 PMMA与GCr15钢球(40mm直径)在转动角位移幅值为0.25~ 2.5°和法向载荷为100N的转动微动试验.在摩擦动力学行为研究的基础上,结合磨痕的微观分析,研究了其转动微动磨损机理.结果表明:随转动角位移幅值的增加,PMMA的转动微动会依次呈现三个区域,即部分滑移区、混合区和完全滑移区;相比部分滑移区和完全滑移区,混合区的摩擦系数明显较高;部分滑移区摩擦系数保持在较低水平且损伤轻微,微动的相对运动由弹性变形协调.在混合区和滑移区PMMA的转动微动磨损机制为伴随黏性流动的颗粒剥落和磨粒磨损.研究发现在混合区和滑移区的磨斑中央产生因黏性流动造成的损伤累积所致的材料隆起. 相似文献
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利用低温气体多元共渗技术将碳、氮、硫、氧元素同时渗入LZ50钢表面形成改性层.在对改性层进行表征的基础上,研究了改性层及LZ50钢基体在干态不同位移幅值下的微动磨损行为及其动力学特性,并采用扫描电子显徼镜和轮廓仪对磨痕形貌进行了分析.结果表明:制备的多元共渗改性层厚度约60 μm,基本由疏松层,化合物层和扩散层组成,化合物层硬度最高,为典型的高硬度多孔结构;改性层改变了LZ50钢的微动运行区域,使得混合区的范围缩小,滑移区向小位移方向移动;由于疏松层的固体润滑作用,与基体LZ50钢相比,在微动初期摩擦因数较低;多元共渗改性层可以显著降低LZ50钢的磨损,在部分滑移区损伤轻微,在混合区和滑移区,改性层的损伤主要表现为剥层和磨粒磨损. 相似文献
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