摘要
采用热重分析 (TGA)、傅立叶红外光分析 (FTIR)和磁头起飞降落 (CSS)等试验方法 ,研究了硬盘磁头 碟界面润滑层PFPE的失效机理以及添加剂X 1P在磁头 碟界面润滑剂中的作用 .研究结果表明 ,高温条件下磁头材料Al2 O3 会诱导磁头 碟界面润滑剂PFPE发生歧化降解 ,造成磁头 碟界面润滑层失效 ;添加剂X 1P因其特殊的分子结构和化学性能 ,可作为一种有效稳定剂添加到磁头 碟润滑剂PFPE中 ,减弱磁头材料Al2 O3 作为催化反应中心的催化反应活性 ,减缓磁头 碟界面润滑剂PFPE的高温歧化降解 ,改善磁头
As a key part of Hard Disc(HDI), the thin film of lu be is possibly degraded and destroyed by the interaction between the magnetic he ad and disk during the hard disk working. Both TGA and FTIR are used to study lu bes failure mechanism of HDI and investigate the function of X-1P as an additiv e in HDI lube. TGA experiment results show that the sample PFPE/X-1P/Al 2O 3 is much more stable than the sample PFPE/Al 2O 3 just as sample PFPE, and the sample PFPE/Al 2O 3 will degrade with high speed at enough high temperature. F TIR experiments present the results similar to that of TGA experiments. From IR sorption spectra at different heating times for the three samples, it can be fou nd that the sample PFPE & the sample PFPE/X-1P/Al 2O 3 are similarly stable, but different from the sample PFPE/Al 2O 3 for which new CF=O absorption peak appeared after heated for 15 min and became stronger with the extending for heat ing time. FTIR experiment results further verifies that alumina is a catalyst fo r PFPE degradation reaction and X-1P can effectively passivate the catalyst and stabilize PFPE. In order to investigate X-1P′s role to mechanical & tribologi cal performances of HDI, the CSS experiment is also performed and the experiment results tell that the presence of X-1P dip-coated on the magnetic head can gr eatly reduce the friction between head and disk and improve CSS performance of H DI. In addition, the failure mechanism of HDI lube and X-1P′s working principl e as a HDI lube additive are analyzed and discussed respectively. The aluminum a tom of alumina has empty orbits which can accept isolated electron pairs, and is a kind of Lewis acid with stronger electrophilic trend. Oxygen atom of PFPE has isolated electron pairs and shows nucleophilic trend. When the magnetic hea d contacts with the HDI lube, it is possible for alumina to induce PFPE to dispr oportionally degrade first from the ether bonding at enough high moment temperat ure. For X-1P, owing to its special molecule structure, not only has a good che mical stability but also shows stronger nucleophilic trend. When alumina contact s with the compounds of X-1P and PFPE, X-1P can be absorbed on the alumina sur face prior to PFPE and keeps PFPE out of contact with alumina, and as such to pr otect PFPE out of degradation.
关键词
磁头-碟界面
润滑剂
添加剂
歧化降解
Head-disk interface, Lube, Additive, Disproporti onation degradation
