Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (04): 821-828.doi: 10.3866/PKU.WHXB201301102

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

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

LIU Qin, KANG Zhi-Xin, FANG Gang   

  1. National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, P. R. China
  • Received:2012-12-12 Revised:2013-01-09 Published:2013-03-25
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51075151) and Key Programof Natural Science Foundation of Guangdong Province, China (10251064101000001).


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).

Key words: Self assembled monolayer, Polymer plating, Composite film, Surface free energy, Hydrophobicity, Micro-tribological property