Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.carbon.2019.06.043
Title: Micromachining of ferrous metal with an ion implanted diamond cutting tool
Authors: Lee, Yan Jin
Hao, Li 
Luder, Johann
Chaudhari, Akshay 
Wang, Shuangyin
Manzhos, Sergei
Wang, Hao 
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Chemistry
Materials Science
GENERALIZED-GRADIENT APPROXIMATION
NANO-POLYCRYSTALLINE DIAMOND
TOTAL-ENERGY CALCULATIONS
MOLECULAR-DYNAMICS
SURFACE-ENERGY
WEAR
RAMAN
DISPLACEMENT
PSEUDOPOTENTIALS
CARBON
Issue Date: 1-Nov-2019
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Citation: Lee, Yan Jin, Hao, Li, Luder, Johann, Chaudhari, Akshay, Wang, Shuangyin, Manzhos, Sergei, Wang, Hao (2019-11-01). Micromachining of ferrous metal with an ion implanted diamond cutting tool. CARBON 152 : 598-608. ScholarBank@NUS Repository. https://doi.org/10.1016/j.carbon.2019.06.043
Abstract: © 2019 Elsevier Ltd Diamond is a highly favourable material for cutting tools, particularly in ultra-precision machining to produce highly accurate freeform surfaces with mirror-like finishing. Unfortunately, diamond cutting tools undergo catastrophic wear when machining transition metals such as iron, cobalt, nickel, etc. The underlying wear mechanism is understood to involve dissociation of carbon atoms from the diamond lattice, i.e. graphitization. Existing approaches of wear reduction aim at reducing chemical reactivity generally through process modifications. In this work, the effectiveness of ion implantation as a tool modification methodology is studied on the gallium ion irradiated diamond tools. Wear occurrences are compared between irradiated diamond and unmodified diamond using thermal analytical techniques and micromachining experiments. Calorimetric tests showed a more than 40% increase in activation energy required for graphitization with a Ga ion dose of 1 × 1013 ions/cm2 at 30 keV. Significant improvements in the wear resistance of an irradiated diamond tool are also observed in micromachining tests with the reduction in workpiece adhesion that indicates potentially lower heat generation at the tool-chip interface for the graphitization process. Ab initio calculations suggest an increased stability against exfoliation with the reduction in surface energy, which influences the surface-to-surface interaction between diamond and catalytic iron.
Source Title: CARBON
URI: https://scholarbank.nus.edu.sg/handle/10635/168902
ISSN: 00086223
18733891
DOI: 10.1016/j.carbon.2019.06.043
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