scholarly journals JUSTIFICATION OF THE SEARCH FOR THE COMPOSITION AND TECHNOLOGY OF PRODUCTION OF HEAT INSULATING MATERIAL OF HIGHER STRENGTH

2021 ◽  
pp. 87-100
Author(s):  
A.G. Nevynsky ◽  
◽  
S.Yu. Kel’ina ◽  
V.A. Chvyr ◽  
◽  
...  
Keyword(s):  
Phase Composition ◽  
Wide Temperature Range ◽  
Liquid Glass ◽  
Chemical Interaction ◽  
Environmental Safety ◽  
Optical Methods ◽  
Technological Parameters ◽  
Insulating Material ◽  
X Ray ◽  
Temperature Range

Abstract. The growth of requirements for the quality and performance of materials used for the construction of ship premises indicates the need to create new types of heat-insulating and structural and finishing products that can provide the stability of operational properties in a wide temperature range, high aesthetics and environmental safety. One of the means of providing these requirements is the use of non-flammable and non-toxic heat-insulating materials of increased strength during a fire. The processes of interaction between the components, the structure and phase composition of the obtained materials studied using complex X-ray phase, IR spectroscopic, and electron-optical methods of analysis. The main estimated quality indicators of the manufactured samples were taken: material density, thermal conductivity, ultimate strength in static bending, water absorption, also flammability and fire resistance, which determined in accordance with the current state standard and international ISO standards. The determination of the basic recipe composition of the raw mixture and the influence of technological parameters on the strength characteristics of the composite material was carried out using the method of mathematical planning of the experiment. The results obtained made it possible to fairly accurately outline the boundaries of variation of the composition of the vermiculite-silicate presscomposition and the main technological parameters. The results of the studies carried out correlate with the indicators of the physical, mechanical and technical properties of the varieties of the modified material, which makes it possible to purposefully search for the optimal composition and technological modes of manufacturing heat-insulating material for shipbuilding purposes. Using the methods of X-ray structural and electron-optical analysis, infrared spectroscopy, it has been established that as a result of heat treatment of the vermiculate-silicate presscomposition, complex physicochemical processes occur. It was found that in the system vermiculate–liquid glass –hardener, the chemical interaction of Al2O3 of vermiculate with liquid glass occurs with the formation of aluminosilicates. Additional crystallization at the vermiculite-water glass interface causes the formation of an intermediate layer of products, which prevents the occurrence of tension. The main regularities of directed synthesis in the system vermiculate–binder–hardener of neoplasms characterized by high strength and thermal stability in a wide temperature range have been studied. The optimal ratios of the main recipe components (vermiculate–binder–hardener), also a certain influence of water repellents, modifiers and reinforcing components on the processes of interaction between components, phase composition and structure of the composite have been determined.

Formation of nanoscale sodium dodecahydro-closo- dodecaborate Na2[B12H12] on silicate matrix surface

2019 ◽  
Vol 484 (1) ◽  
pp. 41-43
Author(s):  
E. A. Malinina ◽  
V. K. Skachkova ◽  
I. V. Kozerozhets ◽  
V. V. Avdeeva ◽  
L. V. Goeva ◽  
...  
Keyword(s):  
Phase Composition ◽  
Ammonium Salt ◽  
Liquid Glass ◽  
Silicate Matrix ◽  
X Ray Diffraction ◽  
X Ray ◽  
Salt Sample ◽  
Matrix Surface

The method of nanoscaled sodium dodecahydro-closo-dodecaborate Na2[B12H12] synthesis is presented. The composite is heated to 200°C to yield the desired product, forming with the introduction of triethyl- ammonium salt [Et3NH]2[B12H12] into the silicate matrix of a sodium liquid glass. The morphology and phase composition of the synthesized sample are studied through SEM and X-ray diffraction methods, in comparison to those of a standard salt sample Na2[B12H12]. Based on the obtained data, the sample under study is an amorphous composite, on the surface of which nanoscale crystals of Na2[B12H12] form.

scholarly journals Phase composition of coatings on the D16 alloy during micro-arc oxdation in alkaline and silicate electrolytes

2020 ◽  
Vol 1,2020 (1,2020 (124)) ◽  
pp. 51-55
Author(s):  
Subbotina V ◽  
Belozerov V ◽  
Sobol’ O
Keyword(s):  
Phase Composition ◽  
Liquid Glass ◽  
Amorphous State ◽  
Practical Significance ◽  
Alkaline Electrolyte ◽  
X Ray ◽  
Micro Arc Oxidation ◽  
Coating Formation ◽  
Al2o3 Phase ◽  
Α Al2o3

Goal. The influence of electrolysis conditions at different electrolyte compositions on the phase formation of coatings obtained by micro-arc oxidation (MDO) on an aluminum alloy D16 was studied. Method. For electrolysis, two types of electrolytes were used: alkaline electrolyte (solution (KOH) in distilled water), silicate electrolyte (with different percentages of Na2SiO3 component). Research results. It was found that the phase composition of the MAO coatings obtained in an alkaline (KOH) electrolyte mainly consists of γ - Al2O3 phases and, to a much lesser extent, the α-Al2O3 phases. An increase in the KOH concentration leads to a shift in the γ – Al2O3 → α – Al2O3 polymorphic reaction toward the formation of the hardest α-Al2O3 phase (corundum). The formation of the preferred orientation of the growth of crystallites of γ – Al2O3 and α – Al2O3 phases during their formation in an alkaline electrolyte was not detected. Scientific novelty. A significant influence on the mechanism and processes of coating formation is made by the addition of liquid glass (Na2SiO3) in the electrolyte. In this case, the growth rate of the coating increases significantly, but the size of the ordering regions decreases from crystalline to X-ray amorphous. The phase composition of the MAO coatings, when they are formed in a silicate electrolyte, varies from a mixture of the γ - Al2O3 phase and mullite (3Al2O3 • 2SiO2) with a low content of liquid glass (10 g/l Na2SiO3) to the formation of only the X-ray amorphous phase with a high content of liquid glass in the electrolyte (50 g/l Na2SiO3). Practical significance. It was concluded that the use of an alkaline or silicate electrolyte with different percentages allows a wide variation of both the phase composition and structural state (α- Al2O3 and γ- Al2O3 phases, mullite (3Al2O3 • 2SiO2) or X-ray amorphous state) and the kinetics of growth the coating itself.

The Technique of Studying X-Ray Scattering over Wide Temperature Range in an Electric Field

2018 ◽  
Vol 60 (5) ◽  
pp. 963-966 ◽  
Author(s):  
S. A. Udovenko ◽  
D. Yu. Chernyshov ◽  
D. A. Andronikova ◽  
A. V. Filimonov ◽  
S. B. Vakhrushev
Keyword(s):  
Electric Field ◽  
Wide Temperature Range ◽  
X Ray ◽  
Temperature Range ◽  
X Ray Scattering ◽  
Ray Scattering

Chemical Interaction of Phosphates MII2P4O12 with Melted MICl or MINO3 (MI – Li, Na, K; MII – Mg, Co, Ni, Zn)

2015 ◽  
Vol 230 ◽  
pp. 297-302 ◽  
Author(s):  
Oksana V. Livitska ◽  
Nataliya Yu. Strutynska ◽  
Igor V. Zatovsky ◽  
Nikolay S. Slobodyanik
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ftir Spectroscopy ◽  
Powder Diffraction ◽  
Diffuse Reflectance ◽  
Chemical Interaction ◽  
Crystalline Phases ◽  
X Ray ◽  
Temperature Range ◽  
Scanning Electron

The interaction in the systemsMII2P4O12-MICl (MINO3) (MI– Li, Na, K;MII– Mg, Co, Ni, Zn) was investigated in temperature range 1073-673 K. The conditions of formation phosphates: Li3PO4,MIMIIPO4(MI– Na, K), Na4MII3(PO4)2P2O7, Na9Co3(PO4)5have been established. Obtained crystalline phases have been investigated using X-ray powder diffraction, Diffuse reflectance, Raman and FTIR spectroscopy and scanning electron microscopy methods.

Crossover from classical to 3d-Ising critical behaviour near the antiferrodistortive phase transition of lawsonite

2005 ◽  
Vol 220 (8) ◽  
Author(s):  
Wilfried Schranz ◽  
Andreas Tröster ◽  
Manuel Gardon ◽  
Gerhard Krexner ◽  
Manfred Prem ◽  
...  
Keyword(s):  
Phase Transition ◽  
Single Crystals ◽  
Wide Temperature Range ◽  
Critical Behaviour ◽  
X Ray ◽  
Temperature Range ◽  
X Ray Scattering ◽  
Ray Scattering

AbstractResults of X-ray scattering intensities and peak profiles of lawsonite single crystals are presented in a wide temperature range including the antiferrodistortive phase transition

scholarly journals Features of Magnetocaloric Effect in Er(Co-Fe)2 Laves Phases

2016 ◽  
Vol 1 (1) ◽  
pp. 5 ◽  
Author(s):  
M.S. Anikin ◽  
E.N. Tarasov ◽  
N.V. Kudrevatykh ◽  
M.A. Semkin ◽  
A.S. Volegov ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Phase Composition ◽  
Magnetocaloric Effect ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Concentration Increase ◽  
Laves Phases ◽  
X Ray ◽  
Temperature Range

<p>In this work the results of measurements of heat capacity (C<sub>P</sub>) and magnetocaloric effect (MCE) in Er(Co<sub>1-</sub><sub>х</sub>Fe<sub>х</sub>)<sub>2</sub> system in the concentration range 0.07 ≤ x ≤ 0.80 are presented. Phase composition was controlled by X-ray difraction analysis. Heat capacity was measured in the temperature range 77-320 K. MCE has been studied within the temperature range 5-670 K in magnetic fields up to 70 kOe. It was found that Fe concentration increase caused the table-like (plateau) MCE temperature dependence for both magnetic entropy change date and direct ∆T-effect measurements independently on Fe concentration. The possible reasons of such behavior are discussed.</p>

scholarly journals Phase equilibria in the MnO-Mn2O3-FeO-Fe2O3-Sb2O3-Sb2O5 System in Air at 1200℃

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
BG Golovkin
Keyword(s):  
Phase Diagram ◽  
Phase Composition ◽  
Phase Equilibria ◽  
Normal Pressure ◽  
X Ray ◽  
Densitometric Analysis ◽  
Temperature Range ◽  
Air Atmosphere ◽  
Different Temperatures ◽  
New Phase

Using the methods of X-ray phase and X-ray Densitometric analysis, the phase equilibria between oxides of manganese, iron and antimony have been investigated in an air atmosphere at temperatures up to 1250? in an air mosphere at normal pressure. The phase diagram of the system at 1200? was built MnO-Mn2O3-FeO-Fe2O-Sb2O3-Sb2O5. A new phase was found Mn12-2x,sup>2+Fe2x2+Sb3+Sb55+O26(0?x?1), with edge compositions FeMn5Sb3O13 and Mn6Sb3O3 (a=8.5003?0.0025Å; b=8.0064?0.0025Å; c=11.5779?0.0025Å; Z = 3; ?obs. = 5.7 g/cm3; ?calc = 5.6991 g/cm3). The phase exists in the temperature range 1180-1230oC and can be obtained by quenching, but always with a large admixture of Mn2Sb2O7 and spinel Mn112+Mn133+Sb93+O44.The reason for this behavior is that air molecules have different temperatures, as a result of which the phase composition of the reaction mixture cannot be strictly related to one temperature, and different phases can be stable at different temperatures.

Influence of Electrolyte-Plasma Hardening Technological Parameters on the Structure and Properties of Banding Steel 2

2020 ◽  
Vol 989 ◽  
pp. 787-792
Author(s):  
Erkezhan Erkinbekkyzy Tabieva ◽  
Laila Gylymmeddenovna Zhurerova ◽  
Daryn Baizhan
Keyword(s):  
Aqueous Solution ◽  
Phase Composition ◽  
Processing Conditions ◽  
Structure And Properties ◽  
Technological Parameters ◽  
Initial State ◽  
Plasma Surface ◽  
X Ray ◽  
Surface Quenching ◽  
Technological Processing

This work is devoted to the study of the influence of technological parameters of electrolytic-plasma surface quenching (EPQ) on the structure and surface properties of samples of bandage steel 2. In the electrolytic-plasma treatment, we performed the cathode mode in an electrolyte containing an aqueous solution of 20% carbamide (NH2)2CO and 20% sodium carbonate Na2CO3, on the installation of EPO with appropriate technological processing conditions. According to the electron-optical, X-ray phase studies, the phase composition of the steel after the EPQ was determined. This differs from the initial one by the formation of cementite and iron oxides on the surface of the samples. It is established that the microhardness of the bandage steel 2 after the EPQ during heating for 4 seconds increases 2.4 times, in comparison with the initial state.

scholarly journals Recent Advances in X-Ray Astronomy

1995 ◽  
Vol 10 ◽  
pp. 3-16
Author(s):  
Yasuo Tanaka
Keyword(s):  
Wide Temperature Range ◽  
X Rays ◽  
New Era ◽  
X Ray ◽  
Temperature Range ◽  
Rocket Flight ◽  
Recent Advances ◽  
Multi Wavelength ◽  
The Universe ◽  
Made In

X-ray astronomy was born in June 1962 with a totally unexpected discovery of a bright X-ray source (presently known as Sco X-1) in a historic rocket flight conducted by Riccardo Giacconi, Herb Gursky, Frank Paolini and late Bruno Rossi. In the last 30 years, astronomy through the newly opened window has made a dramatic expansion.The universe contains enormously rich varieties which had been left unexplored until recent times. From 40’s through 60’s, new wavelength windows, radio, infrared and X-rays successively opened. As a result, the presence of objects and regions distributed over an extremely wide temperature range from a few Kelvin through hundreds of millions of Kelvin were discovered. A burst of surprising discoveries made in 60’s marked the opening of a whole new era of multi-wavelength astronomy.

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