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 Preparation of basalt-based glass ceramics

2003 ◽  
Vol 68 (6) ◽  
pp. 505-510 ◽  
Author(s):  
Branko Matovic ◽  
Snezana Boskovic ◽  
Mihovil Logar
Keyword(s):  
Optical Microscopy ◽  
Phase Analysis ◽  
Glass Ceramic ◽  
Glassy Phase ◽  
Raw Materials ◽  
Glass Ceramics ◽  
High Strength ◽  
Ceramic Materials ◽  
X Ray ◽  
Glass Ceramic Materials

Local and conventional raw materials?massive basalt from the Vrelo locality on Kopaonik mountain?have been used as starting materials to test their suitability for the production of glass-ceramics. Crystallization phenomena of glasses of the fused basalt rocks were studied by X-ray phase analysis optical microscopy and other techniques. Various heat treatments were used and their influences, on controlling the microstructures and properties of the products were studied with the aim of developing high strength glass-ceramic materials. Diopside CaMg(SiO3)2 and hypersthene ((Mg,Fe)SiO3) were identifies as the crystalline phases. The final products contained considerable amounts of a glassy phase. The crystalline size was in range of 8?480 ?m with plate or needle shape. Microhardness, crashing strength and wears resistence of the glass-ceramics ranged from 6.5?7.5, from 2000?6300 kg/cm2 and from 0.1?0.2 g/cm, respectively.

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.

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.

Quantitative Phase Analysis of Synthetic Silicon Nitride by X-Ray Diffraction

1979 ◽  
Vol 23 ◽  
pp. 375-379
Author(s):  
Z. Mencik ◽  
M. A. Short ◽  
C. R. Peters
Keyword(s):  
Silicon Nitride ◽  
Phase Analysis ◽  
Gas Turbines ◽  
Ceramic Materials ◽  
Silicon Oxynitride ◽  
Quantitative Phase Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Quantitative Phase ◽  
Typical Material

Synthetically prepared silicon nitride is one of the more promising ceramic materials for structural components of gas turbines. Typical material may contain a-silicon nitride, Si3N4 (which is believed to always contain oxygen and therefore, according to Grievson, Jack and Wild, is more properly written as Si11.5N15O0.5), β-silicon nitride, Si3N4, silicon oxynitride, Si2ON2, silicon metal, Si, and α-cristobalite, SiO2. Because the physical properties of the ceramic parts are dependent on their phase composition, it is essential that a technique be available for performing a phase analysis. An X-ray diffraction procedure has been, developed for the quantitative phase analysis of synthetically prepared silicon nitride. This procedure converts experimentally measured intensities of selected X-ray diffraction peaks to weight fractions of components using empirically determined intensity coefficients.

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 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.

scholarly journals Effect of fine-grained components on concrete properties and structure formation

2018 ◽  
Vol 143 ◽  
pp. 02004
Author(s):  
Galina Zimakova ◽  
Valentina Solonina ◽  
Marina Zelig ◽  
Viktor Orlov
Keyword(s):  
Phase Analysis ◽  
Size Composition ◽  
Frame Structure ◽  
Material Structure ◽  
X Ray ◽  
Fine Grained ◽  
Silicate Formation ◽  
Zeolite Type ◽  
Hydrated Calcium ◽  
Cellular Concrete

The paper investigates the influence of fine-grained components on the synthesis of new formations and structure of cellular concrete. Grain size composition was defined with the aid of a laser diffraction analyzer of particles ANALYSETTE 22 NanoTecplus. The composition of the obtained hydrated phases was studied using electron microscopy and X-ray phase analysis. The introduction of silica and aluminosilicate components with the specific surface area >350 m2/kg enabled to directly influence the mechanism of the hydrated phases formation. Complex hydrated calcium aluminosilicates of the frame structure of zeolite type and non-permanent composition were identified in the hydration products. The formation of the total set of properties is attributed to the morphological features of the hydrated phases, the nature of connections between the crystalline hydrates, and their location in the material structure. X-ray phase analysis showed that ultra-micro-dispersed components have the stimulating impact on the processes of silicate formation. With the increase in the amount of hydrated new formations and decrease in the liquid phase volume the conditions for building of strong crystal intergrowth contacts were created.

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

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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