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

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.

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

Materials Science Forum ◽

10.4028/www.scientific.net/msf.534-536.1129 ◽

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.

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

Фізика і хімія твердого тіла ◽

10.15330/pcss.21.3.496-502 ◽

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.

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

Glass and Ceramics ◽

10.1007/bf00677671 ◽

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

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

Vestnik Tambovskogo gosudarstvennogo tehnicheskogo universiteta ◽

10.17277/vestnik.2021.01.pp.124-131 ◽

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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Investigations into the phase composition of zirconia-based sinters with an axial texture

Journal of Applied Crystallography ◽

10.1107/s1600576717004575 ◽

2017 ◽

Vol 50 (3) ◽

pp. 769-775

Author(s):

J. Podwórny ◽

M. Staszewski ◽

Józef Wojsa

Keyword(s):

Phase Composition ◽

Phase Analysis ◽

Crystallographic Orientation ◽

Volume Fraction ◽

Mechanical Stresses ◽

Quantitative Phase Analysis ◽

Solid Samples ◽

Statistical Point ◽

X Ray ◽

Quantitative Phase

Owing to the phase transition of the tetragonal form of ZrO2into the monoclinic one, caused by mechanical stresses, preparation of powder samples for quantitative phase analysis by the X-ray diffraction method should be avoided. The process of grinding of zirconia sinters leads to considerable changes in their phase composition. For this reason, a quantitative phase analysis should be conducted on solid samples not subjected to mechanical stresses, irrespective of problems appearing during experiments and analysis. One such problem is preferred crystallographic orientation (texture). This paper describes the influence of a preferred crystallographic orientation on the quantitative phase analysis conducted on solid samples and presents the results of an analysis in which corrections for uniaxial and multiaxial textures were applied. It was found that the examined samples had a very weak but nonzero multiaxial texture. The share of the randomly oriented fraction in the examined sinters was determined to beca94 vol.% and the share of the textured fractionca6 vol.%. From the statistical point of view, in the case of small amounts of the textured fraction, a correction on one distinguished crystallographic plane can overcome this problem. In the case of the slightly textured sinters of metering nozzles subjected to investigation here, the correction related to all the unique directions was statistically insignificant because the textured part corresponds to only a small volume fraction. However, corrections related to all texture axes considerably improve the fit of the calculated X-ray pattern with the experimental one and help to better characterize the examined materials.

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

CHEMISTRY AND CHEMICAL ENGINEERING ◽

10.51348/erbx2001 ◽

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.

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Formation of glasses and glass ceramics in the TeO2–BaZrF6–NaPO3 system

Вестник ДВО РАН ◽

10.37102/08697698.2020.214.6.005 ◽

2020 ◽

pp. 50-55

Author(s):

Ю.В. МАРЧЕНКО ◽

Л.Н. ИГНАТЬЕВА ◽

И.Г. МАСЛЕННИКОВА ◽

В.К. ГОНЧАРУК

Keyword(s):

Raman Spectroscopy ◽

Phase Composition ◽

Phase Analysis ◽

Glass Ceramics ◽

Ir And Raman Spectroscopy ◽

X Ray ◽

Composition And Structure ◽

Component Systems ◽

Ir And Raman

Синтезированы новые стеклокристаллические трехкомпонентные системы TeO2–BaZrF6–NaPO3. Методами ИК-, КР-спектроскопии и рентгенофазового анализа изучено влияние соотношения компонентов в системе на фазовый состав и строение полученных стеклокерамик. The new glass-crystalline three-component systems of TeO2–BaZrF6–NaPO3 have been synthesized. The influence of the ratio of the components in the system on the phase composition and structure of the glass-ceramics obtained has been studied by IR and Raman spectroscopy and X-ray phase analysis.

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Application of the Method of Coprecipitation of Salts to Obtain Zinc Orthostannate

MATEC Web of Conferences ◽

10.1051/matecconf/202134602012 ◽

2021 ◽

Vol 346 ◽

pp. 02012

Author(s):

Dmitry A. Antonov ◽

Valery V. Anisimov ◽

Mikhail A. Tarasenko

Keyword(s):

Phase Composition ◽

Phase Analysis ◽

Chemical Reactions ◽

Temperature Treatment ◽

Initial Composition ◽

X Ray ◽

Temperature Range ◽

Highly Dispersed ◽

Co Precipitation

The effect of the temperature treatment of compounds obtained by the method of co-precipitation of zinc and tin (IV) salts on the synthesis of highly dispersed zinc orthostannate in the temperature range 800 – 1300 °C was studied. The effect of the nonstoichiometric ratio of the components in the initial composition on the phase composition of the resulting zinc orthostannate was considered. The phase composition of the obtained powders is presented according to the data of X-ray phase analysis. Demonstrated chemical reactions occurring during the experiment.

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