Preparation and Properties of Polymeric Nano Composite Filmon Surface of Sintered NdFeB Permanent Magnet

Abstract

A nanofilm(TES-SAMs) was prepared by self-assembly of 6-(3-triethoxysilylpropylamino)-1,3,5-triazine-2,4-dithiol monosodium(TES) on a sintered NdFeB surface.A nano composite film(TES-ATP) was then prepared on the TES-SAMs surface by a self-developed polymer plating technique using 6-(N-allyl-1,1,2,2-tetrahydroperfluorodecylamino)-1,3,5-triazine-2,4-dithiol monosodium(ATP).The surface of the TES-SAMs and TES-ATP were characterized by X-ray photoelectron spectroscopy(XPS),Fourier transform infrared(FTIR) spectroscopy,spectroscopic ellipsometry,atomic force microscopy(AFM),and contact angle measurements.A UMT-2 tribometer was used to investigate their micro-tribological properties.The experimental results showed that the thicknesses of TES-SAMs and TES-ATP were 5.08 and 29.78 nm,respectively.The surface free energy of TES-ATP and TES-SAMs decreased from 73.13 mJ·m-2 for the substrate to 10.19 and 63.39 mJ·m-2,respectively.The contact angle of distilled water on TES-ATP was 123.5°,indicating transformation from a hydrophilic surface to a hydrophobic one.The friction coefficient was effectively reduced from 0.71 for the substrate to 0.22 for TES-SAMs and 0.12 for TES-ATP.In addition,the TES-ATP composite film possessed excellent anti-wear ability.Thus,the present TES-ATP composite film provides a novel approach to solving tribological issues in micro-electro-mechaanical system(MEMS).