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Micro/nano surface modification on brittle materials by tribo nanolithography using PCD tool.

Jeong Woo Park1, Noboru Morita, Deug Woo Lee

  • 1Department of Mechanical Design Engineering, Chosun University, 375, Seosuk-dong, Gwangju, 501-759, Korea.

Journal of Nanoscience and Nanotechnology
|December 7, 2010
PubMed
Summary

This study demonstrates precise mechanical modification of brittle materials using nano-scale tools. Controlling normal force and etching conditions allows for the creation of either protruding or depressed patterns on surfaces.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Mechanical Engineering

Background:

  • Precise control of material modification at the nanoscale is crucial for advanced manufacturing.
  • Understanding the tribological behavior of brittle materials under controlled forces is essential.

Purpose of the Study:

  • To investigate the mechanical modification of brittle materials using polycrystalline diamond (PCD) tools at the micro/nano Newton force level.
  • To explore the generation of surface patterns through controlled scratching and subsequent etching.

Main Methods:

  • Utilized lab-made PCD-attached micro cantilevers for tribo-nanolithography.
  • Employed Atomic Force Microscopy (AFM) to characterize machined patterns.
  • Verified etch characteristics using aqueous solutions.

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  • Analyzed structural changes with Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Secondary Ion Mass Spectrometry (SIMS).

    • Main Results:

    • Demonstrated the ability to create both protruding and depressed patterns by manipulating normal load, scan pitch, and etching parameters.
    • Identified a unique mask effect of brittle materials after nano-scale mechanical scratching.
    • Correlated pattern generation with conventional machining phenomena like chip formation and plastic flow.

    Conclusions:

    • Precise control over normal force and process parameters enables tailored surface pattern generation on brittle materials.
    • The observed mask effect offers a new pathway for controlled surface engineering of brittle materials.
    • Nano-scale mechanical machining provides a viable method for modifying brittle material surfaces with high fidelity.