scholarly journals STRUCTURE AND PHASE COMPOSITION OF THE SURFACES RECOVERED BY ELECTROSPARKING COATINGS. RESULTS OF MICROSTRUCTURAL AND X-RAY DIFFRACTION ANALYSIS

2016 ◽  
Vol 29 (1) ◽  
Author(s):  
А. А. Tamargazin ◽  
Y. V. Brusilo ◽  
Е. P. Puhachevska Puhachevska
Keyword(s):  
Phase Composition ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals X-ray diffraction analysis of products sintered from isostatically pressed leaded bronze powders

2019 ◽  
Vol 298 ◽  
pp. 00037 ◽  
Author(s):  
Evgeny Ageev ◽  
Anton Pereverzev
Keyword(s):  
Phase Composition ◽  
Diffraction Analysis ◽  
Sintered Sample ◽  
Distilled Water ◽  
X Ray Diffraction ◽  
X Ray

This article presents a study of the phase composition of samples sintered from isostatically pressed leaded bronze electroerosion powders obtained in distilled water. It is identified that the main phases in the sintered sample are Cu, Zn2SnO4, Pb(Cu2O2), PbO, Fe3O4.

Synthesis of nanocomposite coating of electrodeposed amorphic layers of the Ni–P–W system

2020 ◽  
pp. 53-60
Author(s):  
A. V. Krasikov
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Differential Scanning Calorimetry ◽  
Phase Composition ◽  
Diffraction Analysis ◽  
Nanocomposite Coating ◽  
Nanocrystalline Phase ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray

The processes of the formation of the nanocomposite coating of Ni–11.5% P–5%W were studied during the heat treatment of amorphous electrodeposited layers. Using the method of differential scanning calorimetry, the temperature of the onset of crystallization of the nanocrystalline phase Ni3P was determined. X-ray diffraction analysis showed that heat treatment produces Ni3P phosphides and, presumably, Ni5P2, the size of which, according to electron microscopy, is 5–50 nm. The influence of the duration of heat treatment on the phase composition and microhardness of coatings is investigated.

scholarly journals Studies on the transformation of calcium sulphate dihydrate to hemihydrate in the wet process phosphoric acid production

2012 ◽  
Vol 14 (2) ◽  
pp. 80-87 ◽  
Author(s):  
Barbara Grzmil ◽  
Bogumił Kic ◽  
Olga Żurek ◽  
Konrad Kubiak
Keyword(s):  
Phase Composition ◽  
Phosphoric Acid ◽  
Diffraction Analysis ◽  
Acid Production ◽  
Phosphate Rock ◽  
Calcium Sulphate ◽  
Industrial Plant ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wet Process

Studies on the transformation of calcium sulphate dihydrate to hemihydrate in the wet process phosphoric acid production The influence of the process temperature from 85°C to 95°C, the content of phosphates and sulphates in the wet process phosphoric acid (about 22-36 wt% P2O5 and about 2-9 wt% SO42-) and the addition of αCaSO4·0.5H2O crystallization nuclei (from 10% to 50% in relation to CaSO4·2H2O) on the transformation of calcium sulphate dihydrate to hemihydrate has been determined. The wet process phosphoric acid and phosphogypsum from the industrial plant was utilized. They were produced by reacting sulphuric acid with phosphate rock (Tunisia) in the DH-process. The X-ray diffraction analysis was used to determine the phase composition and fractions of various forms of calcium sulphates in the samples and the degree of conversion of CaSO4·2H2O to αCaSO4·0.5H2O and CaSO4. It was found that the transformation of CaSO4·2H2O to αCaSO4·0.5H2O should be carried out in the presence of αCaSO4·0.5H2O crystallization nuclei as an additive (in the amount of 20% in relation to CaSO4·2H2O), at temperatures 90±2°C, in the wet process phosphoric acid containing the sulphates and phosphates in the range of 4±1 wt% and 27±1 wt%, respectively.

Texture on Ground, Fractured, and Aged Y-TZP Surfaces

1986 ◽  
Vol 78 ◽  
Author(s):  
Franz Reidinger ◽  
Philip J. Whalen
Keyword(s):  
Phase Composition ◽  
Transition Temperature ◽  
Diffraction Analysis ◽  
Surface Treatment ◽  
Tetragonal Phase ◽  
Surface Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
History Of

ABSTRACTThe phase composition of Y-TZP surfaces has been shown to vary greatly depending on the thermo-mechanical history of the surface. The orientation of these different phases in the surface region is not always random. There is speculation that the alignment of the tetragonal phase before fracturing may play a part in increasing the toughness of these materials. This article deals with an X-ray diffraction analysis of various Y-TZP surfaces with special emphasis on the texture of the different phases. Surfaces which have been ground (and polished), fractured, and aged (200°C) have been examined. In all cases, the monoclinic component that was formed was strongly oriented. The tetragonal phase may or may not be oriented depending on surface treatment. Annealing above the monoclinic-tetragonal transition temperature had little effect on the tetragonal orientation in most cases. Samples fractured at 1000°C have no unusual orientation on the fracture faces.

scholarly journals Evaluation of Cyclic Durability in Surfacemodified Layers with TiNiZr Thermoelastic Phase Transformations

2018 ◽  
Vol 142 ◽  
pp. 03005 ◽  
Author(s):  
Peter Rusinov ◽  
Zhesfina Blednova
Keyword(s):  
Phase Composition ◽  
Diffraction Analysis ◽  
Phase Transformations ◽  
Energy Intensity ◽  
Thermodynamic Characteristics ◽  
Ternary Systems ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cyclic Durability ◽  
Surface Modified

This paper estimated longevity and damaging of surface materials modified by alloys with thermoelastic phase transformations, taking into account: the energy consumed for the formation of failure micro-surface in one cycle, in terms of the shape of the hysteresis loop; energy intensity of the alloy, in the light of phase composition by the results of X-ray diffraction analysis. The energy intensity and theoretical strength of ternary TiNiZr systems are calculated and plotted according to thermodynamic characteristics and phase diagrams of ternary systems. This paper carried out tests of steels with surface-modified TiNiZr layers under conditions of multicyclic fatigue and frictional friction.

scholarly journals X-ray diffraction analysis of electroerosive powder materials, obtained from waste of tungsten-free hard alloy grade KNT16

2020 ◽  
Vol 315 ◽  
pp. 01002 ◽  
Author(s):  
Vladimir Serebrovsky ◽  
Boris Sabel’nikov
Keyword(s):  
Phase Composition ◽  
Diffraction Analysis ◽  
Hard Alloy ◽  
Ethyl Alcohol ◽  
Test Sample ◽  
Powder Materials ◽  
X Ray Diffraction ◽  
X Ray

This article presents a study of the phase composition of powder electroerosive materials of TFHA grade KNT16, obtained in ethyl alcohol. It was established that the main phases in the test sample are TiC, MoNi3, Ni, Mo.

scholarly journals Magnetocaloric properties of Gd(Co1-xFex)2 compounds, with x ≤ 0.60

2018 ◽  
Vol 185 ◽  
pp. 05009
Author(s):  
Maksim Anikin ◽  
Evgeniy Tarasov ◽  
Nikolay Kudrevatykh ◽  
Aleksander Zinin
Keyword(s):  
Phase Composition ◽  
Diffraction Analysis ◽  
Temperature Dependence ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Specific Magnetization ◽  
Magnetic Entropy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Magnetocaloric Properties

In this paper the results of specific magnetization and magnetocaloric effect (MCE) measurements for Gd(Co1-xFex)2 system upon the Co substitution by Fe for the x = 0 ÷ 0.60 range are presented. Phase composition was controlled by X-ray diffraction analysis. MCE has been studied within the temperature range of 300-850 K in magnetic fields up to 17 kOe by the magnetic entropy change calculation (ΔSm). It was found that in contrast to the previously studied R(Co-Fe)2 compounds where R = Dy, Ho, Er, an ordinary symmetrical peak of ΔSm(T) in the vicinity of TC is observed for presented samples. Additionally, the MCE comparison of Gd(Co0.88Fe0.12)2 with that for the isostructural Gd(Ni0.88Fe0.12)2 compound having a plateau-like ΔSm temperature dependence is given. The obtained results are discussed.

The Pyrolytic Conversion of Perhydropolysilazane into Si3N4: X-Ray Diffraction Analysis

1993 ◽  
Vol 321 ◽  
Author(s):  
Cheryl R. Blanchard ◽  
Stuart T. Schwab
Keyword(s):  
Phase Composition ◽  
Diffraction Analysis ◽  
Crystallite Size ◽  
Quantitative Data ◽  
Pyrolysis Temperature ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pyrolytic Products ◽  
Rich Material

ABSTRACTX-ray diffraction analysis was used to study the pyrolytic conversion of a preceramic polysilazane into Si3N4. Quantitative data for crystallite size, phase composition, and degree of crystallinity versus pyrolysis temperature and atmosphere (N2 and NH3) are presented. Pyrolytic products produced under N2 and NH3 atmospheres consist of microcrystals of silicon and a- and β-Si3N4. Under both atmospheres, a majority of the char is crystalline at ∼ 1270°C, and the entire char is crystallized at 1400°C. Pyrolysis under an NH3 atmosphere produces near stoichiometric Si3N4, while pyrolysis under N2 produces a silicon-rich material.

Surface Properties of the Ta and Ag Dual-Ion-Implanted Ti6Al4V Alloy

2013 ◽  
Vol 738 ◽  
pp. 78-82
Author(s):  
Chong Yan Leng ◽  
Rong Zhou ◽  
Xu Zhang
Keyword(s):  
Phase Composition ◽  
Diffraction Analysis ◽  
Photoelectron Spectroscopy ◽  
Ti6al4v Alloy ◽  
X Ray Diffraction ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Glancing Angle ◽  
Chemical States ◽  
Ion Implanted

First, Ti6Al4V alloy samples were modified by tantalum ion implantation at a dose of 1.5×1017ions/cm2, and then silver ion at a dose of 1×1017ions/cm2. Glancing angle X-ray diffraction analysis was used to characterize the phase composition of un-implanted Ti6Al4V alloy and Ta+Ag dual-ion-implanted Ti6Al4V alloy samples. X-ray photoelectron spectroscopy analysis was used to investigate the chemical states of the elements on the Ta+Ag dual-ion-implanted Ti6Al4V alloy sample’s surface. The results show that small amounts of Ta and Ag were present in their elementary forms, along with TiO2, Ta2O5, and TaOx.

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