Nanocrystalline Diamond Deposition for Friction Applications

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dc.contributor.advisor J.E. Rowe, Committee Chair en_US
dc.contributor.advisor R.J. Nemanich, Committee Co-Chair en_US
dc.contributor.advisor O.E. Hankins, Committee Member en_US
dc.contributor.author Winfrey, A. Leigh en_US
dc.date.accessioned 2010-04-02T18:15:25Z
dc.date.available 2010-04-02T18:15:25Z
dc.date.issued 2007-12-07 en_US
dc.identifier.other etd-11072007-160302 en_US
dc.identifier.uri http://www.lib.ncsu.edu/resolver/1840.16/2568
dc.description.abstract The structure and morphology of nanocrystalline diamond films, grown on single side polished silicon (100) wafers by microwave plasma assisted chemical vapor deposition in Ar-H-CH4 plasma, with varying hydrogen concentrations, were analyzed and examined using Raman spectroscopy, scanning electron microscopy, atomic force microscopy, near edge x-ray absorption fine structure spectroscopy, and x-ray diffraction. Visible Raman spectra, XRD data, and NEXAFS spectra exhibit fingerprints for NCD films. Broad bands at 1350 and 1520-1580 cm-1 with shoulders at 1100-1150 cm-1 and 1430-1470 cm-1 and a shoulder at 1150cm-1 are evident in the Raman spectra. The XRD analysis reveals small grain sizes, 5 to 10 nm. The NEXAFS spectra discussed in this thesis are similar to characteristic NCD spectra in the literature and show distinct diamond character. Friction performance was studied using Pin-on-Disk and Reciprocating sliding tribometry with sapphire counterfaces. Tribological performance of nanocrystalline diamond coatings was not influenced by coating roughness over the range studied (20 — 60 nm); however, the coating performance was influenced by coating chemistry. High friction run-in was minimized and a low final friction coefficient <0.05 was measured. These coatings exhibited good wear resistance for sliding against sapphire hemispheres. Their performance was correlated to their properties and structure, which were also studied. Plasma modeling and optical emission spectroscopy revealed plasma parameters, electron plasma temperature and number density, consistent with published results. en_US
dc.rights I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dis sertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to NC State University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. en_US
dc.subject Nanocrystalline Diamond en_US
dc.subject Tribology en_US
dc.title Nanocrystalline Diamond Deposition for Friction Applications en_US
dc.degree.name MS en_US
dc.degree.level thesis en_US
dc.degree.discipline Physics en_US


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