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Study on Failure Mechanism of HDI Lube and Performances of Lube Additive X-1P
Lü Xingdong*1, Shu Wangen1, Shi Pengtu1, Yang Mingchu2
1.Chemistry & Chemical Engineering College of Central-south University,Changsha,410083;2.Material Science & Engineering Department of Tsinghua University,Beijing 100082
Abstract:
As a key part of Hard Disc(HDI),the thin film of lube is possibly degraded and destroyed by the interaction between the magnetic head and disk during the hard disk working. Both TGA and FTIR are used to study lubes failure mechanism of HDI and investigate the function of X-1P as an additive in HDI lube. TGA experiment results show that the sample PFPE / X-1P / Al2O3 is much more stable than the sample PFPE / Al2O3 just as sample PFPE,and the sample PFPE / Al2O3 will degrade with high speed at enough high temperature. FTIR 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 found that the sample PFPE & the sample PFPE / X-1P / Al2O3 are similarly stable,but different from the sample PFPE / Al2O3 for which new CF = O absorption peak appeared after heated for 15 min and became stronger with the extending for heating time. FTIR experiment results further verifies that alumina is a catalyst for PFPE degradation reaction and X-1P can effectively passivate the catalyst and stabilize PFPE. In order to investigate X-1P's role to mechanical & tribological 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 greatly reduce the friction between head and disk and improve CSS performance of HDI. In addition,the failure mechanism of HDI lube and X-1P's working principle as a HDI lube additive are analyzed and discussed respectively. The aluminum atom 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 head contacts with the HDI lube,it is possible for alumina to induce PFPE to disproportionally degrade first from the ether bonding at enough high moment temperature. For X-1P,owing to its special molecule structure,not only has a good chemical stability but also shows stronger nucleophilic trend. When alumina contacts with the compounds of X-1P and PFPE,X-1P can be absorbed on the alumina surface prior to PFPE and keeps PFPE out of contact with alumina,and as such to protect PFPE out of degradation.
Key words:  Head-disk interface,Lube,Additive,Disproportionation degradation
FundProject:
硬盘磁头-碟界面润滑剂失效机理及添加剂X-1P的性能研究
吕兴栋*1, 舒万艮1, 石鹏途1, 杨明楚2
1.中南大学化学化工学院,长沙 410083;2.清华大学材料科学与工程系,北京 100082
摘要:
采用热重分析(TGA)、傅立叶红外光譜分析(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Al2O3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Al2O3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-
关键词:  磁头-碟界面  润滑剂  添加剂  歧化降解
DOI:10.1088/1674-0068/17/1/70-74
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