Sinetring of Cobalt - (3-25 wt.%) Iron Materials

2007 ◽  
Vol 534-536 ◽  
pp. 1129-1132
Author(s):  
Andrzej Romanski
Keyword(s):  
Phase Composition ◽  
Phase Analysis ◽  
Iron Content ◽  
Nitrogen Atmosphere ◽  
X Ray ◽  
Kinetics Of ◽  
Sintered Materials

The kinetics of sintering of Co-Fe materials was studied. The main objective of the work was to establish the effects of iron content and sintering parameters on the microstructure and phase composition of the as-sintered materials. Specimens containing from 3 to 25 wt.% iron were sintered in a dilatometer for one hour at 900, 1000 and 1150OC in either hydrogen or nitrogen atmosphere. The length of specimens during the heating, hold at the temperature and cooling steps were monitored to establish the sample’s shrinkage. Microstructural observations were carried out on polished and etched transverse sections which were also subjected to the X-ray phase analysis.

Formation of bulk samples from the Ti3AlC2 MAX-phase powder by selective laser sintering

2021 ◽  
Vol 2 ◽  
pp. 27-33
Author(s):  
M. G. Krinitcyn ◽  
◽  
I. A. Firsina ◽  
A. V. Baranovskiy ◽  
M. P. Ragulina ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Phase Composition ◽  
Phase Analysis ◽  
Selective Laser Sintering ◽  
Structural Phase ◽  
Laser Sintering ◽  
Max Phase ◽  
X Ray ◽  
Phase Study ◽  
Complex Structural

Bulk samples from the powder of the MAX-phase Ti3AlC2 were obtained by selective laser sintering (SLS). A complex structural-phase study was carried out using optical and electron microscopy, as well as X-ray phase analysis, the elemental and phase composition of the samples was determined, and the morphology of the initial powders and bulk SLS samples was described. This study allowed to describe the elemental and phase composition, as well as the morphology of both the initial powders and bulk SLS samples. Modes of selective laser sintering are established at which the maximum presence of the MAX-phase in the samples after SLS is observed.

scholarly journals Hydrogen desorption kinetics of MgH2 synthesized from modified waste magnesium

2014 ◽  
Vol 32 (3) ◽  
pp. 385-390
Author(s):  
Aysel Kantürk Figen ◽  
Bilge Coşkuner ◽  
Sabriye Pişkin
Keyword(s):  
Hydrogen Desorption ◽  
Nitrogen Atmosphere ◽  
Desorption Kinetics ◽  
X Ray Diffraction ◽  
Heating Rates ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Xrf Scanning ◽  
Isothermal Kinetic ◽  
Kinetics Of

AbstractIn the present study, hydrogen desorption properties of magnesium hydride (MgH2) synthesized from modified waste magnesium chips (WMC) were investigated. MgH2 was synthesized by hydrogenation of modified waste magnesium at 320 °C for 90 min under a pressure of 6 × 106 Pa. The modified waste magnesium was prepared by mixing waste magnesium with tetrahydrofuran (THF) and NaCl additions, applying mechanical milling. Next, it was investigated by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM) and Brunauer-Emmett-Teller (BET) techniques in order to characterize its structural properties. Hydrogen desorption properties were determined by differential scanning calorimetry (DSC) under nitrogen atmosphere at different heating rates (5, 10, and 15 °C/min). Doyle and Kissenger non-isothermal kinetic models were applied to calculate energy (Ea) values, which were found equal to 254.68 kJ/mol and 255.88 kJ/mol, respectively.

The effect of iron content on dehydration kinetics of talc

2020 ◽  
Author(s):  
Li Yi ◽  
Ruixin Zhang ◽  
Siyu Yang
Keyword(s):  
Subduction Zone ◽  
Iron Content ◽  
Diffraction Experiment ◽  
Dehydration Reaction ◽  
X Ray Diffraction ◽  
Hydrous Mineral ◽  
Hydrous Minerals ◽  
X Ray ◽  
Kinetics Of

<p>    Subduction zone is a distinct activity structure of hypocenter distribution of earthquakes. Hydrous minerals are involved in the chemical and physical activities in subduction zones. As a widely distributed hydrous mineral in shallow depths, talc has potential significance in various fault activities, and its dehydration reaction may be an important cause of the earthquake. Iron is a main element of the earth's crust, and the iron contents of hydrous minerals have a large impact on melting point, the rheological strength physical and chemical properties of the rocks. As a common hydrous mineral, the iron content of talc is not uniform; therefore, it is very important to study the dehydration kinetics of talc with different iron content.</p><p>    The dehydration reaction of three different iron contents talc was studied by means of synchronous thermal analysis, high temperature and high pressure differential thermal experiment and in-situ synchrotron X-ray diffraction experiment. Data of synchronous thermal analysis was calculated by Flynn-Wall-Ozawa (FWO). The activation energies of different iron content talc were calculated as 359.8 kJ/mol（FeO：0.4wt%），368.2.0 kJ/mol（FeO：2.0wt％），belonging to the second-order reaction. Data of in-situ synchrotron X-ray diffraction experiment was fitted by Avrami equation, E=350 kJ/mol（FeO：2.0wt％），n=1.67. The dehydration of talc followed random nucleation and growth mechanism. High content of iron obviously resulted in lower dehydration temperature.</p><p>  The release rate of talc dehydration fluid was 2.3E-05 to 6.1E-06 obtained by in-situ synchrotron X-ray diffraction experiment，it could lead to local overpressure induced rock brittle fracture. The supercritical fluid produced by the dehydration of talc in the subduction zone further attenuates the rock, resulting in local overpressure, which eventually leads to rock failure. The results suggested that the dehydration of different iron contents of talc may occur at the different depth around hundreds of kilometers, so the study was significant to our understanding of the genetic mechanism of earthquakes in the subduction zone.</p>

scholarly journals Influence of the nano-WC content and Sintering Temperature on the Phase Composition of Hard Alloys in the System TiC–WC–VC–NiCr

2020 ◽  
Vol 21 (3) ◽  
pp. 496-502
Author(s):  
S. Pukas ◽  
L. Zinko ◽  
N. German ◽  
R. Gladyshevskii ◽  
I. V. Koval ◽  
...  
Keyword(s):  
Solid Solution ◽  
Phase Composition ◽  
Phase Analysis ◽  
Sintering Temperature ◽  
Technological Factor ◽  
Hard Alloys ◽  
X Ray ◽  
Metal Binder

The effect of the WC content and the sintering temperature, as the main technological factor, on the phase composition of TiC–xWC–5VC–18NiCr alloys was investigated by X-ray phase analysis. It was established that the main phases in the investigated alloys were the NaCl-type quaternary (Ti,V,W)C phase and a solid solution of Cr in Ni. Depending on the size of the WC particles used for the preparation, the metal binder could be described by the formula Ni0.75Cr0.25 (for nano WC) or Ni0.5Cr0.5 (for fine-sized WC). In alloys prepared with fine-sized WC, elementary Cr and traces of the Cr3C2 and Cr23C6 were also found. With increasing content of nano-sized WC and sintering temperature the solubility of W in (Ti,V)C increased. No W2C phase was detected under the conditions of the investigation.

Synthesis of Aromatic Polyethersulfones

2020 ◽  
Vol 869 ◽  
pp. 15-20
Author(s):  
Zakhirat Kh. Sultigova ◽  
Zareta I. Inarkieva ◽  
Arsen M. Kharaev ◽  
Rima Ch. Bazheva ◽  
Maryam Parchieva
Keyword(s):  
Ir Spectroscopy ◽  
Phase Analysis ◽  
Main Chain ◽  
X Ray ◽  
Kinetics Of

Modified aromatic polyethersulfones containing dichloroethylene and arylate groups in the main chain were modified . The kinetics of the synthesis of polyethersulfones by the method of acceptor-catalytic polycondensation was studied. By the methods of IR spectroscopy, elemental, X-ray phase analysis, the formation of polymers of a given structure is proved. It is shown that the property of the obtained polymers depends on the ratio of the starting monomers.

Determination of the qualitative phase composition of a ceramic by x-ray phase analysis

1992 ◽  
Vol 49 (9) ◽  
pp. 435-437
Author(s):  
E. M. Dyatlova ◽  
N. M. Bobkova ◽  
T. N. Yurkevich ◽  
E. M. Kurpan
Keyword(s):  
Phase Composition ◽  
Phase Analysis ◽  
X Ray ◽  
Qualitative Phase

scholarly journals Formation of Silicide and Silicide-Aluminide Coatings on Molybdenum Alloy during Slurry Cementation Process: Influence of Slurry Volume

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6940
Author(s):  
Agnieszka Elżbieta Kochmańska ◽  
Aneta Jarlaczyńska ◽  
Jolanta Baranowska
Keyword(s):  
Phase Composition ◽  
Growth Kinetics ◽  
Protective Coatings ◽  
Void Formation ◽  
Molybdenum Alloy ◽  
X Ray Diffraction ◽  
Time Intervals ◽  
X Ray ◽  
Aluminide Coatings ◽  
Kinetics Of

New slurry cementation method was used to produce silicide and silicide-aluminide protective coatings on molybdenum alloy (TZM). The slurry cementation processes were carried out at a temperature of 1000 °C in different time intervals with the use of varied slurry mass values. The microstructure and thickness of the coatings were studied by means of scanning microscopy. Chemical composition using X-ray microanalysis and phase composition using X-ray diffraction were also investigated. Coating microhardness was determined. The obtained coatings had a multilayer structure. Phases from the Al-Si-Mo system were observed in silicide-aluminide coatings and phases from the Si-Mo system were observed in silicide coatings. The microhardness strongly depended on the phase composition of the coating. It was demonstrated that slurry mass values had an important influence on the morphology and growth kinetics of silicide-aluminide coatings. In the case of a small amount of the slurry, the deficiency of alloying elements occurring during long processes reduces growth kinetics and can lead to void formation in the structure of silicide-aluminide coatings.

scholarly journals Influence of modification of hydroxyapatites by various cations on its phase composition.

2020 ◽  
Vol 11 (3-2020) ◽  
pp. 49-51
Author(s):  
A. S. Gigilev ◽  
Keyword(s):  
Phase Composition ◽  
Phase Analysis ◽  
X Ray ◽  
Modifying Additives ◽  
Doubly Charged

The paper describes the synthesis of hydroxyapatite using doubly charged cations Mg2+, Sr2+, Zn2+as modifying additives. The results of X-ray phase analysis of the obtained samples are presented.

scholarly journals Phase Composition of Silicon in the Krasnoslobodsky Deposit of the Tambov Region

2021 ◽  
Vol 27 (1) ◽  
pp. 124-131
Author(s):  
D. M. Mordasov ◽  
◽  
M. D. Mordasov ◽  
Keyword(s):  
Phase Composition ◽  
Silicon Dioxide ◽  
Elemental Composition ◽  
Diffraction Pattern ◽  
Phase Analysis ◽  
Fluorescence Analysis ◽  
Modern Equipment ◽  
X Ray ◽  
Chemical And Phase Compositions

The study of the chemical and phase compositions of tripoli from Krasnoslobodskoye deposit in the Tambov region was carried out using modern equipment. Using the X-ray fluorescence analysis, the main elemental composition of the rock under study was established, determined mainly by the compounds of Si, Al, Fe, K, Mg, Ca, Ti, P, S, Na. It is shown that the proportion of silicon dioxide in the sample under study exceeds its content in tripoli from many Russian deposits and neighboring countries. The X-ray phase analysis with subsequent interpretation of the diffraction pattern showed that tripoli contains minerals of amorphous opal, microcrystalline - and -cristobalites as structural forms of silica, as well as small amounts of quartz, illite and montmorillonite impurities.

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