Friction-induced structural transformations of DLC coatings under different atmospheres.

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The structural transformations that occur in diamondlike carbon coatings with increasing hydrogen content have been investigated by Raman spectroscopy, transmission electron microscopy, electron diffraction, and electron-energy-loss spectroscopy. Friction tests were performed with uncoated steel balls against coated substrates at contact stresses of 1 GPa in ambient air (relative humidity = 30 - 40%), dry air (relative humidity < 1%), and dry nitrogen (< 1%). The lowest friction coefficient (f < 0.02) was obtained for the most hydrogenated sample in dry nitrogen, where the formation of a third-body layer was observed on the steel surface. Raman spectra obtained from the counterfaces ... continued below

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22 pages

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Sanchez-Lopez, J. C.; Erdemir, A.; Donnet, C. & Rojas, T. C. March 21, 2002.

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The structural transformations that occur in diamondlike carbon coatings with increasing hydrogen content have been investigated by Raman spectroscopy, transmission electron microscopy, electron diffraction, and electron-energy-loss spectroscopy. Friction tests were performed with uncoated steel balls against coated substrates at contact stresses of 1 GPa in ambient air (relative humidity = 30 - 40%), dry air (relative humidity < 1%), and dry nitrogen (< 1%). The lowest friction coefficient (f < 0.02) was obtained for the most hydrogenated sample in dry nitrogen, where the formation of a third-body layer was observed on the steel surface. Raman spectra obtained from the counterfaces after sliding in humid and dry air revealed a remarkable increase and narrowing of the ''D'' and ''G'' peaks with decreasing humidity. Analysis of peak positions and I(D)/I(G) ratios pointed to an increasing order and an enlargement of the sp{sup 2} clusters under friction. The shape and position of the carbon K-edge spectra for the transfer layer are affected the same way, although evidence of extended graphite layer formation was not observed. Development of these differing trends was correlated with the hydrogen-to-carbon ratio of the gas precursor used during the synthesis and with the type of surrounding atmosphere.

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22 pages

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  • International Conference on Metallurgical Coatings and Thin Films(ICMCTF 2002), San Diego, CA (US), 04/21/2002--04/26/2002

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  • Report No.: ANL/ET/CP-107194
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 795034
  • Archival Resource Key: ark:/67531/metadc743151

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  • March 21, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 21, 2016, 5:56 p.m.

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Sanchez-Lopez, J. C.; Erdemir, A.; Donnet, C. & Rojas, T. C. Friction-induced structural transformations of DLC coatings under different atmospheres., article, March 21, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc743151/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.