Characterization and tribological investigation of self-assembled MPTS-MPTES/RE composite films
来源期刊：Journal of Rare Earths2009年第3期
论文作者：蒋喆 程先华
文章页码：490 - 495
摘 要：γ-mercapto-propyl trimethoxysilane（MPTS） and γ-methacryloxy propyltrimethoxysilane（MPTES） were self-assembled on a hydroxylated glass substrate to form a two-dimensional organic monolayer（MPTS-MPTES SAM） . The terminal thiol groups（-SH） in the MPTS-MPTES SAM were in-situ oxidized into sulfonic acid groups（-SO3H） to endow the film with good chemisorption ability. Then rare earth（RE） （lanthanum-based） composite thin films were prepared by self-assembly technique based on the as-prepared SAM,taking advantage of the chemisorption ability of the sulfonic acid groups. Automatic force microscope（AFM） ,X-ray photoelectron spectrometry（XPS） ,contact angle measurement and ellipsometer were used to characterize MPTS-MPTES/RE composite films. The macrofriction and wear behaviors of the films sliding against an AISI-52100 steel ball were examined on a unidirectional friction and wear tester,and the worn surface morphologies were observed on an AFM. The results showed that MPTS-MPTES/RE films had a low friction coefficient（0.09） and a long wear life（5980 sliding pass） at a light load（50 mN） . It indicated that the superior tribological properties of the MPTS-MPTES/RE composite films were attributed to the special characteristic of RE elements,the mobility of the films and good bonding strength.
蒋喆1，程先华1,2
1. School of Mechanical Engineering,Shanghai Jiaotong University
摘 要：γ-mercapto-propyl trimethoxysilane（MPTS） and γ-methacryloxy propyltrimethoxysilane（MPTES） were self-assembled on a hydroxylated glass substrate to form a two-dimensional organic monolayer（MPTS-MPTES SAM） . The terminal thiol groups（-SH） in the MPTS-MPTES SAM were in-situ oxidized into sulfonic acid groups（-SO3H） to endow the film with good chemisorption ability. Then rare earth（RE） （lanthanum-based） composite thin films were prepared by self-assembly technique based on the as-prepared SAM,taking advantage of the chemisorption ability of the sulfonic acid groups. Automatic force microscope（AFM） ,X-ray photoelectron spectrometry（XPS） ,contact angle measurement and ellipsometer were used to characterize MPTS-MPTES/RE composite films. The macrofriction and wear behaviors of the films sliding against an AISI-52100 steel ball were examined on a unidirectional friction and wear tester,and the worn surface morphologies were observed on an AFM. The results showed that MPTS-MPTES/RE films had a low friction coefficient（0.09） and a long wear life（5980 sliding pass） at a light load（50 mN） . It indicated that the superior tribological properties of the MPTS-MPTES/RE composite films were attributed to the special characteristic of RE elements,the mobility of the films and good bonding strength.
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