scholarly journals INFLUENCE OF THE ALUMINUM OXIDE ADDITIVE ON THE PHASE COMPOSITION OF MULLIT-FORMING ALUMINOSILICATE MINERALS

2020 ◽  
pp. 22-26
Keyword(s):  
Phase Composition ◽  
Comparative Analysis ◽  
High Temperature ◽  
Aluminum Oxide ◽  
Phase Analysis ◽  
Quartz Content ◽  
Oxide Additive ◽  
X Ray ◽  
Temperature Firing ◽  
Positive Effect

The aim of the research is to determine the effect of alumina on the phase composition of shale of the Jerdanak deposit and the quartz-pyrophyllite rock of the Baynaksay deposit during high-temperature firing. X-ray phase analysis determined changes in the phase composition of rocks with additives from 5 to 20% aluminum oxide as a result of firing at 1300 and 1400 °C. A comparative analysis revealed the absence of cristobalite formation, a decrease in the quartz content, and an increase in the amount of mullite for shale samples. No positive effect of alumina additives on the phase composition of quartz-pyrophyllite rock was found.

Study of the phase composition of fine-grained tungsten carbide based ceramic materials by x-ray phase analysis

2019 ◽  
Vol 85 (8) ◽  
pp. 37-42 ◽  
Author(s):  
P. V. Andreev ◽  
K. E. Smetanina ◽  
E. A. Lantsev
Keyword(s):  
Phase Composition ◽  
Tungsten Carbide ◽  
Phase Analysis ◽  
Ceramic Materials ◽  
X Ray ◽  
Fine Grained

scholarly journals Determination of Chromite Sands Suitability for Use in Moulding Sands

2017 ◽  
Vol 17 (2) ◽  
pp. 107-110
Author(s):  
K. Stec ◽  
J. Podwórny ◽  
B. Psiuk ◽  
Ł. Kozakiewicz
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Chemical Composition ◽  
Chemical Properties ◽  
Grinding Process ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
Spectroscopy Technique ◽  
X Ray

Abstract Using the available analytical methods, including the determination of chemical composition using wavelength-dispersive X-ray fluorescent spectroscopy technique and phase composition determined using X-ray diffraction, microstructural observations in a highresolution scanning microscope equipped with an X-ray microanalysis system as well as determination of characteristic softening and sintering temperatures using high-temperature microscope, the properties of particular chromite sands were defined. For the study has been typed reference sand with chemical properties, physical and thermal, treated as standard, and the sands of the regeneration process and the grinding process. Using these kinds of sand in foundries resulted in the occurrence of the phenomenon of the molding mass sintering. Impurities were identified and causes of sintering of a moulding sand based on chromite sand were characterized. Next, research methods enabling a quick evaluation of chromite sand suitability for use in the preparation of moulding sands were selected.

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.

Biomorphic TiO2 Ceramics Prepared from Cotton Stalk

2012 ◽  
Vol 602-604 ◽  
pp. 526-529
Author(s):  
Qing Wang ◽  
Lin Zhang ◽  
Ya Hui Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phase Composition ◽  
High Temperature ◽  
Sol Gel ◽  
Cotton Stalk ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbon Template ◽  
Scanning Electron

Biomorphic TiO2 was prepared by high temperature pyrolysis and a modified sol-gel route. The morphology and microstructure of TiO2 samples were characterized by scanning electron microscopy. The phase composition of the resulting sample was analyzed by X-ray diffraction. The results suggest that the biomorphic TiO2 mainly consists of rutile TiO2, and replicates the shape and part microstructure of the carbon template.

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.

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.

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 Mechanoactivation of chromium silicide formation in the SiC-Cr-Si system

2002 ◽  
Vol 34 (3) ◽  
pp. 231-240 ◽  
Author(s):  
M. Vlasova ◽  
M. Kakazey ◽  
J.G. Gonzales-Rodriguez ◽  
G. Dominguez ◽  
Momcilo Ristic ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silicon Carbide ◽  
High Pressure ◽  
High Temperature ◽  
Ir Spectroscopy ◽  
Phase Analysis ◽  
Temperature Treatment ◽  
Silicide Formation ◽  
X Ray ◽  
Chromium Silicide

The processes of simultaneous grinding of the components of a SiC-Cr-Si mixture and further temperature treatment in the temperature range 1073-1793 K were studied by X-ray phase analysis, IR spectroscopy, electron microscopy, and X-ray microanalysis. It was established that, during grinding of the mixture, chromium silicides form. A temperature treatment completes the process. Silicide formation proceeds within the framework of the diffusion of silicon into chromium. In the presence of SiO2 in the mixture, silicide formation occurs also as a result of the reduction of silica by silicon and silicon carbide. The sintering of synthesized composite SiC-chromium silicides powders at a high temperature under a high pressure (T = 2073 K, P = 5 GPa) is accompanied by the destruction of cc-SiC particles, the cc/3 transition in silicon carbide and deformation distortions of the lattices of chromium silicides.

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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