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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