Temperature Dependent Tribological Studies and Phase Transformation in Ultra-Nanocrystalline Diamond Films

doi:10.1166/sam.2014.1764

機構典藏 > College of Sciences > Graduate Institute & Department of Physics > Journal Article > Item 987654321/97216

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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
Keywords:	HIGH TEMPERATURE GRAPHITIZATION;HIGH TEMPERATURE TRIBOLOGY TEST;PHASE TRANSFORMATION;ULTRA-NANOCRYSTALLINE DIAMOND FILMS
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), p.751–759
DOI:	10.1166/sam.2014.1764
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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