Căutare după Autor "Gheorghieș, Constantin"
Afișează articolele 1-9 of 9
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Characterization of Materials Surface by X-Ray Reflectivity Measurements
(Universitatea ”Dunărea de Jos” din Galați, 2009)The mechanical or physical properties of surface determine a certain behaviour of material in various working conditions. For example, the roughness of surface influences the value of friction coefficient. X-ray reflectivity ... -
Characterization on the Red Mud Resulted from the Alumina Bayer Process Production for the Future Use in Geopolymers Synthesis
(Universitatea "Dunărea de Jos" din Galați, 2014)This paper presents the results of analyses on the chemical, structural and morphological processing of bauxite red mud resulting from alkaline wet Bayer technology. The characterization of the material considered as ... -
Diffractometry Analysis on Non-Conventional Treated Steels after Tribological Tests
(Universitatea ”Dunărea de Jos” din Galați, 2009)Two steel grades were subjected to a nitro-carburized thermo-chemical treatment after thermo-magnetic treatments. The contact was studied employing the concept of tribosystem and tribomodel. The structural aspects into ... -
Laser Cladding of Ni-Cr-B-Fe_Al Alloy on a Steel Support
(Universitatea "Dunărea de Jos" din Galați, 2005)Multilayer coating by injection of powder with 8.9% Cr, 4.5% Fe, 5.1% B, 2.4% Al, 0.6% Cu; all reminded of Ni, as chemical composition, in melted bath by CO2 continuous wave laser connected to x-y-z coordinate table was ... -
On the Corrosion Behavior of Organic Nanocomposite Coatings
(Universitatea "Dunarea de Jos" din Galați, 2009)Recently, researches on composite coatings of organic nature with the addition of metallic oxide nanopowders have shown an increasing corrosion resistance of metallic materials. Carbon steel shows an improved behavior ... -
Preliminary Results on the use of Palm Oil and Shea Butter in Lubrication Process in Food Industry
(Universitatea ”Dunărea de Jos” din Galați, 2009)In this study, vegetal oils (palm oil and shea butter) are analyzed for their uses in lubrication of mechanical part of machines in food industry. These vegetal oils were analyzed by X-ray diffraction and transmission ... -
Roughness as Small Surface Defects and Microstructure Changes in the Fatigue Process
(UDJG, 2011)Examinations in detail using X-radiation diffraction of the dislocation substructure in fine-grained S355JR steels plate specimen fatigued with constant amplitude were carried out to investigate the correlation between the ... -
A test for Rapid Tribological Characterization of Bearing Steels
(Universitatea "Dunărea de Jos" din Galați, 2012)In this paper is a study the influence of the material and heat treatment on the changes of the fine structure parameters of the superficial layer of triboelements during the first cycles of rolling contact process. The ... -
X-Ray Diffraction Residual Stress Measurements for Quality Control Testing
(Universitatea "Dunărea de Jos" din Galați, 2007)This paper present the primary difficulties which are associated with the obtaining and interpreting surface X-ray diffraction residual stress results: the surface stresses may be identical for the shoot peening, nitriding ...
