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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Effect of carbon embedding on the tribological properties of magnetic media surface with and without a perfluoropolyether (PFPE) layer
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Effect of carbon embedding on the tribological properties of magnetic media surface with and without a perfluoropolyether (PFPE) layer

机译：碳嵌入对有无全氟聚醚（PFPE）层的磁性介质表面摩擦学性能的影响

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摘要

Carbon embedding (≤1 nm) in the top surface of cobalt (～100 nm) sputtered on a silicon surface is used as a surface modification technique to evaluate the tribological properties with or without an ultra-thin layer of perfluoropolyether (PFPE) lubricant. The carbon embedding is achieved using the filtered cathodic vacuum arc technique at an ion energy of 90 eV. Transport of ions in matter simulations, time-of-flight secondary ion spectroscopy, transmission electron microscopy and x-ray photoelectron spectroscopy (XPS) are used to study the carbon embedding profiles and surface chemical composition. The XPS results show that carbon embedding using the ion energy of 90 eV results in the formation of about 58 6% of tetrahedral (sp~3) carbon hybridization. Furthermore, the XPS results also show that the carbon embedding is effective in improving the anti-oxidation resistance of cobalt. Ball-on-disk tribological tests are conducted at a contact pressure of 0.26 GPa on the modified cobalt surface with or without the PFPE layer. It is observed that the average coefficient of friction is reduced considerably from a value of approximately 0.7 to 0.42 after the surface modification. The coefficient of friction is further reduced to ～0.26 after the deposition of an ultra-thin layer of PFPE over the modified surface, which is lower than a friction coefficient of 0.4 from commercial media. The modified cobalt surface also shows much better wear life than the present day commercial media.
机译：溅射在硅表面的钴（〜100 nm）顶表面的碳嵌入量（≤1nm）用作表面改性技术，以评估有无超薄全氟聚醚（PFPE）润滑剂层的摩擦学性能。使用过滤阴极真空电弧技术在离子能量为90 eV时实现碳嵌入。离子在物质模拟，飞行时间二次离子光谱，透射电子显微镜和X射线光电子能谱（XPS）中的传输用于研究碳的埋入轮廓和表面化学成分。 XPS结果表明，使用90 eV的离子能量进行碳嵌入会形成约58 6％的四面体（sp〜3）碳杂化。此外，XPS结果还表明，碳的埋入对改善钴的抗氧化性是有效的。在带有或不带有PFPE层的改性钴表面上，在0.26 GPa的接触压力下进行圆盘摩擦测试。可以看出，表面改性后，平均摩擦系数从大约0.7降低到0.42。在改性表面上沉积超薄PFPE层后，摩擦系数进一步降低至〜0.26，低于商业介质的0.4摩擦系​​数。改性的钴表面还显示出比当今商业介质更好的磨损寿命。

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