Results 221 to 230 of about 102,074 (262)
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Hard carbon and composite metal/hard carbon films prepared by a dc unbalanced planar magnetron
Vacuum, 1990Abstract A dc planar magnetron, of an unbalanced type, has been used for the sputtering of graphite in both argon and a mixture of argon/propane. Hard carbon films were prepared, with some polymeric inclusions in the latter case, as witnessed from the measurement of the optical gap and ir spectra.
H Biederman +4 more
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Nanoporous Hard Carbon Membranes for Medical Applications
Journal of Nanoscience and Nanotechnology, 2007Current blood glucose sensors have proven to be inadequate for long term in vivo applications; membrane biofouling and inflammation play significant roles in sensor instability. An ideal biosensor membrane material must prevent protein adsorption and promote integration of the sensor with the surrounding tissue. Furthermore, biosensor membranes must be
Roger J, Narayan +10 more
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Hard Rubber. Its Carbon and Hydrogen Content
Rubber Chemistry and Technology, 1936Abstract IN THE course of a study of vulcanization it became necessary to compare the ratios of carbon, hydrogen, and sulfur in hard rubber. A search of the literature revealed no analyses for carbon and hydrogen, although many analyses for sulfur in hard rubber have been recorded.
Harry L. Fisher, Y. Schubert
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Isotopic exchange in hard amorphous carbonized layers
Journal of Applied Physics, 1990Hard amorphous films of a-C:H and a-C:D were deposited by a rf glow discharge in either CH4 or CD4 . By ion bombardment with protons and deuterons, the H/D exchange process was studied as function of the bombardment fluence by means of depth profile measurements.
Boutard, D., Moeller, W., Scherzer, B.
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Carbon in hard magnetic alloys
Metal Science and Heat Treatment, 19771. With increasing carbon concentrations in Alnico alloys the effective number of conduction electrons increases, which increases the thermal stability of γ phase. A single-phase structure cannot be obtained with over 0.05% C. 2. The precipitation of strongly magnetic phase from the supercooled solid solution occurs at 620–880°.
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Mechanisms of orientation and graphitization of hard-carbon matrices in carbon/carbon composites
Journal of Materials Research, 1992It now appears generally accepted that the process of stress-induced orientation and graphitization of a thermoset-resin-derived matrix in a carbon-fiber/carbon-matrix (C/C) composite is principally a result of molecular orientation induced during the pyrolysis process as a consequence of the restraint of pyrolysis shrinkage at the fiber/matrix ...
Gerald S. Rellick +2 more
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Wear prediction of hard carbon coated hard-on-hard hip implants using finite element method
International Journal of Computer Aided Engineering and Technology, 2018This paper presents finite element (FE) analysis of the effects of hard carbon coatings on wear evolution of hard-on-hard hip implants. Three different types of thin film hard carbon coatings on the articulating surfaces of the bearing components (e.g., on both head and cup) are considered and they are nanocrystalline diamond (NCD), diamond-like carbon
S. Shankar +3 more
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Hard carbon coatings deposited on steel
Applied Surface Science, 2007We report results of steel substrates coated with hard amorphous carbon and with diamond films. In order to enhance the adherence to the substrate, steel substrates were pretreated by means of a silicon ion beam. Raman spectroscopy was used to analyze the structure of silicon interface while the elastic recoil detection analysis method was applied to ...
M. Reinoso, F. Álvarez, H. Huck
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Carbon implantation into hard chrome coatings
Surface and Coatings Technology, 1996Abstract Carbon ions were implanted into hard chrome coatings at an energy of 30 keV for various doses up to 4 × 10 17 C cm −2 to study possible new phase formation and its effect on the tribological properties. The retained doses and ion distributions were determined by ion beam analysis techniques and phase formation was monitored by grazing ...
Z. Rao +3 more
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Aging of metal/hard-carbon films
SPIE Proceedings, 1996Unbalanced electromagnetron operated in Ar/n-hexane mixture was employed for deposition of composite Ag/C:H films. For comparison composite Ni/C:H films were prepared in a similar way using unbalanced planar magnetron with permanent magnets. Optical transmission measurements, TEM micrographs, and dc electrical measurements, were used to study ageing ...
Hynek Biederman +5 more
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