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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/97216

    Title: Temperature Dependent Tribological Studies and Phase Transformation in Ultra-Nanocrystalline Diamond Films
    Authors: Radhika Ramadoss;Niranjan Kumar;Kamatchi Jothiramalingam Sankaran;Pankaj Das;T. R. Ravindran;Sitaram Dash;Ashok Kumar Tyagi;Tai, Nyan-Hwa;Lin, I-Nan
    Contributors: 淡江大學物理學系
    Date: 2014-04
    Issue Date: 2014-03-18 10:31:52 (UTC+8)
    Publisher: Valencia: American Scientific Publishers
    Abstract: Temperature dependent tribological properties of ultra-nanocrystalline diamond (UNCD) films were studied in ambient, dry and unlubricated conditions while sliding against Al2O3 ball. In as-grown UNCD film, there is well defined grain/grain boundary interphase morphology. However, larger grains along with graphite/amorphous carbon (a-C) phase are formed in this film when subjected to tribo-test at 600 °C. These morphological aspects are evident from high resolution transmission electron microscopy (HRTEM). As revealed from micro-Raman spectroscopy, the inner region of wear tracks of high temperature tribo-tested film shows surface chemical changes accompanied with amorphization. In addition, micro-FTIR measurement confirmed pronounced surface oxidation in the wear track of high temperature tribo-tested film. Ultra-low friction coefficient and high wear resistance of these films were measured at room temperature and 200 °C. Such an ultra-low friction coefficient can be attributed to passivation of surface dangling bonds by the formation of weak van der Waals and hydrogen bonds. However, at high temperature (600 °C), the tribological performance of the film was found to degrade and at early sliding passes it deformed and failed abruptly due to accompanied oxidation and amorphization/polymerization.
    Relation: Science of Advanced Materials 6(4),pp.751–759
    DOI: 10.1166/sam.2014.1764
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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