Magnetotribology of ferromagnetic/ferromagnetic sliding couple
Magnetotribology of ferromagnetic/ferromagnetic sliding couple
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DOI：
10.1016/j.wear.2007.01.081
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发表时间：
2007-09
期刊：
影响因子：
5
通讯作者：
H. Zaidi;M. Amirat;J. Frěne;T. Mathia;D. Paulmier
中科院分区：
文献类型：
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作者：
H. Zaidi;M. Amirat;J. Frěne;T. Mathia;D. Paulmier
在旋转滑动的铁磁钢/钢周围施加的磁场改变了接触的摩擦和磨损行为。摩擦测试在环境空气或10−5Pa高真空室中进行。施加的法向载荷为 0.1、18.5 和 37N。在没有磁场的情况下，接触是延性钢与钢之间的严格粘合开槽模式。当施加磁场时，环境空气中的触点逐渐变黑，并覆盖一层脆而厚的黑色氧化物层，这在数百个循环后导致低摩擦和低磨损模式。在低法向载荷 P=0.1N 下，针对磁化接触测量了销和盘的正磨损率。该质量增加是由于氧化学吸附的施加磁场的激活所致。磁化磨损颗粒的 X 射线衍射分析揭示了铁磁性 Fe3O4 氧化物的存在。该结果表明，遵循电子自旋守恒理论，磁化接触增强了铁磁氧化物 Fe3O4 的生长，而不利于非铁磁氧化物 Fe2O3 和 FeO。磁摩擦学行为现象尤其发生在铁磁/铁磁滑动偶中，因为对不同偶的不同实验研究表明了这一点。磁场中旋转圆盘的接触凹凸不断受到从零到B以及从B到零的高磁通量变化，从而产生电场E。然后，摩擦化学活化可以通过与感应电场E相关的卡布雷拉和莫特模型来解释。本研究将介绍环境空气和真空中的摩擦学行为，磁化接触中成核和氧化层生长的实验结果。将提出铁磁接触的磁摩擦学行为模型。
Applied magnetic field around the rotating sliding ferromagnetic steel/steel modifies the friction and the wear behaviour of the contact. The friction tests where conducted in ambient air or in high vacuum chamber 10−5Pa. The applied normal loads are 0.1, 18.5 and 37N. Without magnetic field, the contact is ductile steel against steel in a severe adhesive grooving mode. When a magnetic field is applied, the contact in ambient air progressively became black, covered by a brittle thick black layer of oxides which leads to a low friction and a low wear mode after some hundred cycles. Under the low normal load P=0.1N, a positive wear rate for the pin and for the disc was measured for magnetized contact. This mass increase is due to the activation by applied magnetic field of the oxygen chemisorption. X-ray diffraction analysis of magnetized wear particles reveals the existence of ferromagnetic Fe3O4oxide. This result shows that the magnetized contact enhances the ferromagnetic oxide Fe3O4growth to the detriment of the non-ferromagnetic oxides Fe2O3and FeO, following the electronic spin conservation theory. The magnetotribological behaviour phenomenon occurs especially in ferromagnetic/ferromagnetic sliding couples as it was shown by different experimental studies on different couples. The contact asperities of rotated disc in magnetic field are continuously submitted to the high magnetic flux variation from zero to B and from B to zero, which leads to electrical field creation E. Then, tribochemical activation can be explained by the Cabrera's and Mott's model related to the induced electrical field E. This study will present the tribological behaviour in ambient air and in vacuum, the experimental results of the nucleation and the growth of oxide layer in magnetized contact. A model of magnetotribological behaviour of ferromagnetic contact will be presented.