The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform
Fernando Booth - One of the best experts on this subject based on the ideXlab platform.
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cazro3 mgo structural ceramics obtained by reaction sintering of dolomite zirconia mixtures
Journal of The European Ceramic Society, 2016Co-Authors: P Pena, Fernando Booth, Liliana B Garrido, E F Aglietti, Abilio P Silva, Carmen BaudinAbstract:Abstract Processing and properties of two fine grain and dense CaZrO 3 -MgO based composites obtained by reaction sintering of pure ZrO 2 and dolomite (CaMg(CO 3 ) 2 ) are described. Two dolomites with different levels of impurities were used to fabricate the materials: high purity (Impurity Content ≈1.2 wt.%, material DBZ) and impure dolomite (Impurity Content ≈6.12 wt.%, material DNZ). Mixtures (molar 1:1) were attrition milled and the reaction and sintering processes were studied using dynamical techniques (DTA-TG and dilatometry). Adequate sintering schedule was selected using the controlled sintering technique. The role of impurities on the physical characteristics, microstructure and mechanical properties of the obtained composites was analysed. Noticeable changes in microstructure, porosity, grain size and phases, were observed as function of final sintering temperature at 1350, 1400, 1450 °C, and Impurity Content. The obtained microstructures are discussed on the basis of the phase equilibrium relationships.
Carmen Baudin - One of the best experts on this subject based on the ideXlab platform.
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cazro3 mgo structural ceramics obtained by reaction sintering of dolomite zirconia mixtures
Journal of The European Ceramic Society, 2016Co-Authors: P Pena, Fernando Booth, Liliana B Garrido, E F Aglietti, Abilio P Silva, Carmen BaudinAbstract:Abstract Processing and properties of two fine grain and dense CaZrO 3 -MgO based composites obtained by reaction sintering of pure ZrO 2 and dolomite (CaMg(CO 3 ) 2 ) are described. Two dolomites with different levels of impurities were used to fabricate the materials: high purity (Impurity Content ≈1.2 wt.%, material DBZ) and impure dolomite (Impurity Content ≈6.12 wt.%, material DNZ). Mixtures (molar 1:1) were attrition milled and the reaction and sintering processes were studied using dynamical techniques (DTA-TG and dilatometry). Adequate sintering schedule was selected using the controlled sintering technique. The role of impurities on the physical characteristics, microstructure and mechanical properties of the obtained composites was analysed. Noticeable changes in microstructure, porosity, grain size and phases, were observed as function of final sintering temperature at 1350, 1400, 1450 °C, and Impurity Content. The obtained microstructures are discussed on the basis of the phase equilibrium relationships.
Abilio P Silva - One of the best experts on this subject based on the ideXlab platform.
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cazro3 mgo structural ceramics obtained by reaction sintering of dolomite zirconia mixtures
Journal of The European Ceramic Society, 2016Co-Authors: P Pena, Fernando Booth, Liliana B Garrido, E F Aglietti, Abilio P Silva, Carmen BaudinAbstract:Abstract Processing and properties of two fine grain and dense CaZrO 3 -MgO based composites obtained by reaction sintering of pure ZrO 2 and dolomite (CaMg(CO 3 ) 2 ) are described. Two dolomites with different levels of impurities were used to fabricate the materials: high purity (Impurity Content ≈1.2 wt.%, material DBZ) and impure dolomite (Impurity Content ≈6.12 wt.%, material DNZ). Mixtures (molar 1:1) were attrition milled and the reaction and sintering processes were studied using dynamical techniques (DTA-TG and dilatometry). Adequate sintering schedule was selected using the controlled sintering technique. The role of impurities on the physical characteristics, microstructure and mechanical properties of the obtained composites was analysed. Noticeable changes in microstructure, porosity, grain size and phases, were observed as function of final sintering temperature at 1350, 1400, 1450 °C, and Impurity Content. The obtained microstructures are discussed on the basis of the phase equilibrium relationships.
Ann M Hirt - One of the best experts on this subject based on the ideXlab platform.
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magnetic susceptibility as a tool to study deformed calcite with variable Impurity Content
Geochemistry Geophysics Geosystems, 2010Co-Authors: Bjarne S G Almqvist, Marco Herwegh, Volkmar Schmidt, Thomas Pettke, Ann M HirtAbstract:[1] A set of calcite mylonites were systematically sampled along the basal shear zone of the Morcles Nappe, located in the southwestern Swiss Alps, to investigate the relationship among crystallographic preferred orientation (CPO), chemistry, and anisotropy of magnetic susceptibility (AMS). Second-phase minerals are ≤10 vol % of the rock. The substitution of trace impurities for Ca in the calcite crystal lattice, in particular, Fe, Mn, Mg, and Sr, varies among the samples with total values ranging from 1450 ± 190 ppm in the most pure sample to 2450 ± 320 ppm for the most impure sample. Fe shows the largest variation among the sample group and varies by a factor of nearly four from the purest (230 ± 30 ppm) to the most impure sample (840 ± 110 ppm). All samples have negative bulk susceptibility, and the concentration of ferromagnetic (in a broad sense) phases is very low. A correlation is identified between trace element chemistry, CPO of calcite, and the magnetic susceptibility. The bulk susceptibility and the AMS vary systematically with Fe and Mn elemental concentration in the matrix calcite, and this variation is apparent for the entire length of the shear zone. A simple model that takes into account the CPO and trace element chemistry is used to explain the resulting bulk susceptibility and AMS. Calcite mylonites and marbles from other locations fit the model, indicative of a general relationship between CPO, chemistry, and AMS in calcites where second-phase minerals are sparse. For lithologies that are dominated magnetically by calcite, with a deficiency of secondary phases, magnetic susceptibility can be used to rapidly screen rock samples for the variation of paramagnetic trace elements Fe and Mn and CPO, which can then be used for detailed microfabric studies.
T L Prakash - One of the best experts on this subject based on the ideXlab platform.
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preparation of high pure zinc for electronic applications using selective evaporation under vacuum
Separation and Purification Technology, 2012Co-Authors: S T Ali, Srinivas K Rao, C Laxman, N R Munirathnam, T L PrakashAbstract:Abstract m6N pure (99.9999%) zinc (Zn) was obtained through multiple vacuum distillations using 99.9% (m3N) pure Zn as input material at 2 kg batch-size. The soaking (distillation) temperature and the time of distillation at a dynamic vacuum level of 2.1 * 10−3 Torr were optimized to achieve the desired purity, distillation rate and yield. The detailed analysis of input as well as purified Zn was carried out by inductively coupled optical emission spectroscopy (ICP-OES) technique for 14 major Impurity elements. This confirmed the reduction of total Impurity Content from ∼983 to
