Littérature scientifique sur le sujet « Gravure du chrome massif »
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Articles de revues sur le sujet "Gravure du chrome massif"
SHIRYAEV, Pavel Borisovich, et Nadezhda Vladimirovna VAKHRUSHEVA. « Zonality of ore-forming chrome spinels of medium-chrome and aluminous chromitites of the Voikaro-Syninsky massif ». NEWS of the Ural State Mining University, no 2 (15 juin 2021) : 39–47. http://dx.doi.org/10.21440/2307-2091-2021-2-39-47.
Texte intégralALEKSEEV, Aleksandr Valer’evich, et Tat’yana Andreevna SHERENDO. « Composition, structure and magnetic properties of ore chrome spinels of the Klyuchevsky massif (Middle Urals) ». NEWS of the Ural State Mining University 1, no 1 (23 mars 2020) : 73–85. http://dx.doi.org/10.21440/2307-2091-2020-1-73-85.
Texte intégralChernyshov, A. I., A. N. Yurichev et A. V. Kicheeva. « Petrogeochemical characteristics of chrome-bearing ultramafites in the Kurtushibinsky ophiolite belt (Western Sayan) ». LITHOSPHERE (Russia) 19, no 5 (23 novembre 2019) : 687–703. http://dx.doi.org/10.24930/1681-9004-2019-19-5-687-703.
Texte intégralSherendo, Tatyana, Valentin Mitrofanov, Aleksey Vdovin, Petr Martyshko, Aleksey Alexeev, Dmitry Zamyatin, Vladimir Vazhenin et Lidia Pamyatnykh. « Magnetic Clusters in Natural Ferro-Chromian Spinels ». Solid State Phenomena 233-234 (juillet 2015) : 587–90. http://dx.doi.org/10.4028/www.scientific.net/ssp.233-234.587.
Texte intégralVakhrusheva, N. V., K. S. Ivanov, V. N. Puchkov et P. B. Shiryaev. « SUBALKALINE BASALTOIDS IN ULTRAMAFIC ROCKS OF THE RAI-IZ MASSIF (POLAR URALS) AND THEIR PETROGENETIC SIGNIFICANCE ». Доклады Российской академии наук. Науки о Земле 509, no 2 (1 février 2023) : 208–14. http://dx.doi.org/10.31857/s2686739722602538.
Texte intégralLesnov, F. P., M. Yu Podlipskii, G. V. Polyakov et S. V. Palesskii. « Geochemistry of accessory chrome-spinellides from rocks of the Ergakskii chrome-bearing hyperbasite massif (western Sayan) and conditions of its formation ». Doklady Earth Sciences 423, no 1 (novembre 2008) : 1245–49. http://dx.doi.org/10.1134/s1028334x08080138.
Texte intégralMurzin, V. V., К. N. Malitch, I. Yu Badanina, D. A. Varlamov et I. S. Chashchukhin. « Mineral assemblages from chromitites of the Alapaevsk dunite-harzburgite massif (Middle Urals) ». LITHOSPHERE (Russia) 23, no 5 (3 novembre 2023) : 740–65. http://dx.doi.org/10.24930/1681-9004-2023-23-5-740-765.
Texte intégralAnkushev, M. N., V. V. Zaykov, V. A. Kotlyarov et M. E. Romanenko. « Chrome spinels and accessory mineralization in the weathering crust of the Vladimir deposit, Varshavsky ultramafic massif, southern Urals ». Geology of Ore Deposits 58, no 8 (décembre 2016) : 697–710. http://dx.doi.org/10.1134/s1075701516080031.
Texte intégralBakhterev, V. V. « High-temperature electrical conductivity of chromite ores from the Alapaevsky hyperbasite massif, Middle Urals, as a function of their composition and metamorphism ». LITHOSPHERE (Russia) 22, no 4 (3 septembre 2022) : 526–35. http://dx.doi.org/10.24930/1681-9004-2022-22-4-526-535.
Texte intégralPavel Borisovich, SHIRYAEV, et VAKHRUSHEVA Nadezhda Vladimirovna. « Chemical zoning of chrome-spinel nodules and oxythermobarometry of nodular chromitites of the Engayskoe-3 occurrence in the Rai-Iz massif (Polar Urals) ». News of the Ural State Mining University 1, no 2 (26 juin 2019) : 28–33. http://dx.doi.org/10.21440/2307-2091-2019-2-28-33.
Texte intégralThèses sur le sujet "Gravure du chrome massif"
Laourine, Feriel. « Texturation de la surface d’aciers inoxydables par plasmas chlorés et compréhension des mécanismes mis en jeu par l’étude de la gravure du fer, du chrome et du nickel massifs ». Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0252.
Texte intégralThe structuring at sub-micronic scale of the surface of stainless steels allows to provide them with new functionalities, for example for tribological and optical applications. This thesis is part of the ANR SPOT project which aims to structure the surface of austenitic and martensitic steels on a submicronic scale by dry etching. In this work, we have developed a plasma process with a mixture of chlorine and argon for the etching of stainless steels. The development of this process was carried out based on the study of the etching of the main metals that make up these steels, namely, iron, chromium and nickel. Based on measurements of etching speeds, as well as on plasma diagnostic techniques, we have shown that, in a chlorine and argon plasma, iron is the most etched element, followed by chromium, then nickel. The metallic and the stainless steels etched samples were analyzed by surface characterization techniques, in particular X photoelectron spectrometry (XPS) analyzes. We have also studied the variation of the etching speeds of these metals and steels as a function of the temperature of the substrates. These studies have enabled us to establish the mechanisms involved in the etching of metallic elements. We have shown that in a plasma of chlorine and argon, iron is mainly etched by a chemical mechanism which follows an Arrhenius law. This mechanism would be based on the formation of volatile iron chlorides. In the case of chromium, the etching requires ionic assistance in order to desorb the non-volatile chromium chlorides formed on the surface of the material. Finally, for nickel, we observed that the etching speed decreases when the temperature increases. In this case, observations with a scanning electron microscope made it possible to highlight the formation of swellings rich in chlorine. XPS analyzes of the etched surface of nickel suggest that these swellings are due to the formation of non-volatile nickel chlorides. These chlorides would be at the origin of the decrease in the rate of etching of nickel, the sputtering of which would be blocked by the presence of these chlorides. Understanding these mechanisms led to conclude that, in a chlorinated plasma, the blocking element in the etching of stainless steels is nickel
Fandeur, Dik Stefano. « Géochimie et cristallochimie du chrome au cours de l'altération de roches ultrabasiques en Nouvelle-calédonie (Massif du Koniambo) ». Paris 7, 2009. http://www.theses.fr/2009PA077035.
Texte intégralIn New-Caledonia, 35 Ma of deep weathering of ultramafic rocks yield soils strongly enriched in metallic trace elements (Ni, Co, Cr, Mn). In these soils, these large amounts of metallic trace elements constitute a significant risk for the environmental quality of this peculiar environment. Among these metallic trace elements, chromium is the most problematic because it is the most abundant (up to 3,8 wt% of Cr₂O₃), but also that showing the largest toxicity potential, depending on its redox state. After studying the redistribution of major and trace elements upon the formation of a 64 meters depth regolith in the Koniambo outcrop, a detailed study of the crystal-chemistry of chromium allowed to better understand thé behavior of this element along the weathering sequence. Initially as Cr(III), Cr is partially oxidized to Cr(VI) after redox reactions with Mn-oxyhydroxydes which accumulate at the boundary between the saprolitic and lateritic levels of the sequence. These Mn-oxyhydroxydes are also suspected to significantly increase the solubility of chromite, a mineral species usually considered as almost insoluble Regarding the very large solubility of Cr(VI), such an oxidation of Cr(III) should significantly increase the leaching of chromium along the sequence. However, mass balance with the Brimhall method indicate a quite restricted mobility for chromium, although slightly larger in the Mn-enriched levels. These observations are explained by the results of spatially-resolved analyses which show that, once oxidized by the Mn-oxyhydroxydes, Cr(VI) is re-adsorbed by the Fe-oxyhydroxydes (mainly goethite), abundant in these lateritic environments, underlying the importance of Fe-oxyhydroxydes to mitigate this leaching
Kierczak, Jakub. « Spéciation solide du nickel et du chrome dans un site minier et industriel à usage agricole (Szklary, Pologne) ». Limoges, 2007. https://aurore.unilim.fr/theses/nxfile/default/9a2fbfbb-1238-4d3e-af9f-c2d3e533d23f/blobholder:0/2007LIMO4034.pdf.
Texte intégralThe geological unit called Szklary Massif comprises two environments containing Ni and Cr from diverse origins: lithogenic (serpentine soils) and anthropogenic (pyrometallurgical waste) origins. The study was dedicated to investigate the distribution and mobility of Ni and Cr occurring within this small area. The approach is first based on mineralogical characterization of the Ni and Cr bearing minerals using analytical instrumental methods (XRD, SEM-EDS, EPMA, micro Raman, TEM, ICP-MS). Later complementary chemical extractions not only provide information about the actual solid speciation of Cr, Ni. They also allow discussing about potential mobility and forthcoming environmental impact induced by the abundance of Ni and Cr and by the presence of other elements (Co, Cu, Pb and Zn), especially in soils cultivated in the dump vicinity. The multidisciplinary approach gives concordant and complementary results. The direct mineralogical approach, consisting in characterization of primary and secondary mineral phases, provides qualitative information about the stability of potentially toxic elements (PTE) in minerals in the present weathering conditions (well drained soils, enriched in organic matter, within neutral to basic pH, submitted to transitional temperate climatic conditions). The chemical extractions specify the solid speciation of PTE in a quantitative way and evidence implication of organic and amorphous phases in the PTE immobilization. In addition, mineralogical investigations of the solid residues after sequential extractions allow assessment of the real effect of the chemical extractants used on the studied materials. The use of combined approach evidenced relative stability of Cr compared to Ni. Moreover, the study confirms contamination of the cultivated soils located next to the waste dump. The environmental risk is related not only with Ni and Cr but also with other PTE such as Zn and Cu, which are present in significant proportions within biodisponible fractions
Al-Khoury, Waël. « Etude structurale par spectrométrie Mössbauer et diffraction des rayons X d'alliage Fe-Cr à l'état massif et en couches minces : transformation de phase autour de la composition équi-atomique ». Poitiers, 2006. http://www.theses.fr/2006POIT2303.
Texte intégralThe goal of this thesis is the structural study of bulk – phase transformation (body-centered cubic) (tetragonal) at 700 °C – and thin films Fe-Cr alloys by Mössbauer spectrometry and X ray diffraction. An accurate structural characterization of the phase transformation at 700 °C in bulk FeCr alloys with coarse grains was carried out. The most relevant result, highlighted by the Mössbauer effect, is the existence of intermediate phase so-called ' between initial phase and final phase . The X-ray diffraction made it possible to reject the assumption of a B2 structure for the ' phase which structure is similar to the one. Laue's microdiffraction has shown that there were no simple crystallographic orientation relationships between the two phases. Let us note that we measured for the first time, the Young's modulus of the phase; its value is slightly higher (10%) than the phase one. Fe1-xCrx thin films with 200 nm thicknesses were prepared by ion beam sputtering. For 0 < x ≤ 0. 28, the films present a ferromagnetic behavior, whereas paramagnetic spectra CEM are obtained for 0. 32 ≤ x< 0. 70. The ferromagnetic to paramagnetic transition (F/P) at room temperature appears at xc ~ 0. 30; this critical value depends on the preparation method. Finally, a very interesting parallel can be made concerning phase transformation for the equiatomic concentration between bulk and thin film alloys. Indeed, the starting and final magnetic states of the transformation are opposites. In the bulk alloys, the phase transformation starts from ferromagnetic bcc structure () and goes toward the paramagnetic tetragonal structure (), whereas in the films, a paramagnetic A15 structure () transforms in ferromagnetic bcc structure ()
Chapitres de livres sur le sujet "Gravure du chrome massif"
Kislov, Evgeniy V., Vadim S. Kamenetsky, Alexey V. Malyshev et Vladislav V. Vanteev. « Concentrically-Zoned Mafic-Ultramafic Marinkin Massif, Middle Vitim Highland, Baikal Region, Russia : Inclusions in Chrome Spinel—Key to Mineral Formation Processes ». Dans Springer Proceedings in Earth and Environmental Sciences, 111–18. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-49468-1_15.
Texte intégralActes de conférences sur le sujet "Gravure du chrome massif"
Савицкий, Александр, Вера Ильна et Владимир Кевлич. « Preliminary assessment of the radiation-hygienic situation at the Aganozero complex deposit ». Dans Mineralogical and technological appraisal of new types of mineral products. Petrozavodsk : Karelian Research Center of RAS, 2019. http://dx.doi.org/10.17076/tm13_13.
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