Mechanical And Tribological Studies Of Nickel Nanodot-Patterned Surfaces.

Overview

Nanodot-patterned surfaces (NDPSs) are surfaces covered with an ordered array of nanodots with approximately the same size and shape. Recently, NDPSs have attracted considerable research attention for their potential tribological applications in microelectromechanical systems (MEMS). NDPSs have also shown promising potential for the next generation of ultrahigh density magnetic recording media where tribological performances will be a great concern. The main objective of this research is to investigate the ...
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Overview

Nanodot-patterned surfaces (NDPSs) are surfaces covered with an ordered array of nanodots with approximately the same size and shape. Recently, NDPSs have attracted considerable research attention for their potential tribological applications in microelectromechanical systems (MEMS). NDPSs have also shown promising potential for the next generation of ultrahigh density magnetic recording media where tribological performances will be a great concern. The main objective of this research is to investigate the mechanical and tribological properties of Ni NDPSs using both experimental and modeling approaches, with an ultimate goal of establishing experimentally verified models for designing and predicting the contact and tribological behaviors of a NDPS. Mechanical properties of the Ni NDPS were studied using nanoindentation. The results showed that the Ni nanodots have a smaller elastic modulus, but a larger hardness than bulk microcrystalline Ni. The Ni nanodot was also found to be very strong having an estimated critical shear stress to initiate plastic deformation close to the theoretical shear strength in dislocation-free single crystal Ni. Adhesion and friction performances of the Ni NDPS were also evaluated. Significant reduction in adhesion and friction was achieved on the Ni NDPS compared with a smooth Si surface. In addition, detailed deformation and frictional behavior of the Ni NDPS during friction tests were studied. The proportionality between the real contact area and the friction force was observed at the nano-scale. A numerical model that is suitable for simulating the nanoindentation of a Ni NDPS on a deformable Si substrate was developed and experimentally verified by nanoindentation tests. The verified numerical model was then used to investigate the contact behavior of the Ni NDPS. It was found that the yield strength has large impact on the contact behavior but the elastic modulus has little impact. Both the substrate and the nanodots were found to have significant effect on the contact. The effect of strain hardening and the effect of misalignment between the nanodots and the indenter tip on the nanoindentation of the Ni NDPS were found to be small. A multi-asperity friction model for simulating the friction of the Ni NDPS was established based on a scale-dependent single-asperity friction model The simulation results are in general agreement with the experimental results. The study of the difference between using scale-dependent and scale-independent single-asperity friction models suggests that the frictional stress at the nano-scale is scale-dependent. In summary, the experimental studies of the mechanical and tribological properties of the Ni NDPS demonstrate the promising potential tribological applications of NDPSs in MEMS and ultrahigh density magnetic recording media. The numerical models established in this research could potentially serve as design tools for NDPSs targeted towards mechanical and tribological applications. The detailed characterization and study of the nanodot deformation in this research also shed light on the fundamental understanding of multi-asperity contact and friction at the nano-scale.
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Product Details

  • ISBN-13: 9781243713575
  • Publisher: BiblioLabsII
  • Publication date: 9/8/2011
  • Pages: 64
  • Product dimensions: 7.44 (w) x 9.69 (h) x 0.13 (d)

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