scholarly journals Thermal expansion of nickel-chromium ChS88U alloy at high temperatures

2021 ◽  
Vol 2057 (1) ◽  
pp. 012116
Author(s):  
Yu M Kozlovskii ◽  
S V Stankus
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Temperature Dependence ◽  
High Temperatures ◽  
Reference Values ◽  
Experimental Results ◽  
Temperature Range ◽  
Nickel Chromium ◽  
Estimated Error

Abstract The experimental results of the study of thermal expansion of nickel-chrome alloy in the temperature range of 293.15–1400 K are presented. The phase transformation of the first kind in the alloy is observed. The estimated error of the obtained data is 3%. Approximation equations and a table of reference values for the temperature dependence of the studied properties are obtained.

The Phase Transformation of Recycling Concrete in Recalcination

2013 ◽  
Vol 743-744 ◽  
pp. 175-179 ◽  
Author(s):  
Zhi Gang Zhang ◽  
Zong Hui Zhou ◽  
De Cheng Zhang ◽  
Xin Cheng
Keyword(s):  
Phase Transformation ◽  
Calcium Hydroxide ◽  
Calcium Silicate ◽  
Calcium Silicate Hydrate ◽  
Eutectic Temperature ◽  
Experimental Results ◽  
Industrial Wastes ◽  
Cement Clinker ◽  
Temperature Range ◽  
Natural Aggregates

In this paper, the artificial aggregates were prepared by limestone and industrial wastes in accordance with the ratio of cement raw meal, to obtain the recycling concrete replacing natural aggregates. Cement clinker could be regenerated by these recycling concrete and the aim of recycling could be realized. After these concrete was cured for 90 days, then was crushed and grinded, the phase transformation of recycling concrete in recalcination would been studied by XRD and so on. The experimental results showed that the composition of the recycling concrete met the demand of clinker modulus and C2S, C3S, C4AF, C3A were well crystallized at 1400 °C. So these recycling concrete could be directly calcined. The calcium hydroxide dehydrated around the temperature of 500°C. The calcium silicate hydrate was dehydrated gradually between the temperature of 400°C and 1000°C. At the same time, C2S crystallized during the temperature range. C4AF and C3A stared to crystallize around the temperature of 1000°C. Due to the composition of these concrete was complex, the lowest eutectic temperature dropped. C3S started to crystallize around the temperature of 1250°C and the best crystallization was achieved at the temperature of 1400°C.

The Coefficients of Thermal Expansion of La2O3, TaVO5 and Ta16W18O94 Below Room Temperature

1986 ◽  
Vol 108 (3) ◽  
pp. 275-277 ◽  
Author(s):  
C. N. Chu ◽  
N. Saka ◽  
N. P. Suh
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Room Temperature ◽  
Space Applications ◽  
Thermal Expansion Data ◽  
Temperature Range ◽  
Reversible Phase

The coefficients of thermal expansion (CTE) of La2O3, TaVO5 and Ta16W18O94 were measured in the temperature range 150–300 K for space applications. Hot pressed La2O3 showed a positive CTE of 8.6 × 10−6 K−1. Sintered TaVO5 had a positive and extraordinarily large CTE (50 × 10−6 K−1), but the CTE was negative (−4.0 × 10−6 K−1) in the temperature range 340–380 K. The thermal expansion data suggest a reversible phase transformation near 260 K. The CTE of hot pressed Ta16W18O94 was −1.52 × 10−6 K−1. Sintered Ta16W18O94 showed slight hysteresis, but the CTE was about −1.0 × 10−6 K−1.

scholarly journals Studies on Thermophysical Properties of CaO and MgO by γ-Ray Attenuation

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
A. S. Madhusudhan Rao ◽  
K. Narender
Keyword(s):  
Thermal Expansion ◽  
Temperature Dependence ◽  
Thermophysical Properties ◽  
Linear Thermal Expansion ◽  
Temperature Dependent ◽  
Degree Polynomial ◽  
Attenuation Coefficients ◽  
Temperature Range ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients

The study on temperature dependent γ-ray attenuation and thermophysical properties of CaO and MgO has been carried out in the temperature range 300 K–1250 K using different energies of γ-beam, namely, Am (0.0595 MeV), Cs (0.66 MeV), and Co (1.173 MeV and 1.332 MeV) on γ-ray densitometer fabricated in our laboratory. The linear attenuation coefficients (μl) for the pellets of CaO and MgO as a function of temperature have been determined using γ-beam of different energies. The coefficients of temperature dependence of density have been reported. The variation of density and linear thermal expansion of CaO and MgO in the temperature range of 300 K–1250 K has been studied and compared with the results available in the literature. The temperature dependence of linear attenuation coefficients, density, and thermal expansion has been represented by second degree polynomial. Volume thermal expansion coefficients have been reported.

Magnetic properties of rare earth chromium borates at high temperatures

2021 ◽  
pp. 166-170
Author(s):  
O.K. Kuvandikov ◽  
◽  
N.I. Leonyuk ◽  
V.V. Malsev ◽  
M.M. Kuzmin ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Rare Earth ◽  
Temperature Dependence ◽  
High Temperatures ◽  
Wide Temperature Range ◽  
Magnetic Moments ◽  
Chemical Formula ◽  
Temperature Range ◽  
Curie Temperatures

Temperature dependence of the magnetic susceptibility has been studied for rare-earth borates NdCr3(BO3)4, SmCr3(BO3)4 and LuCr3(BO3)4 by the Faradey method in the wide temperature range (300-1200 K). The dependence for each phase follows the Curi - Weis law. The Curie temperatures, Neel temperatures and magnetic moments corresponding to the chemical formula of the crystals, have been found.

Thermal expansion of decagonal Al70.7Co13.3Ni16.0 in the temperature range 15–300 K

2001 ◽  
Vol 216 (12) ◽  
Author(s):  
A. Kupsch ◽  
D. C. Meyer ◽  
P. Gille ◽  
P. Paufler
Keyword(s):  
Thermal Expansion ◽  
Temperature Dependence ◽  
Lattice Parameters ◽  
Temperature Range

AbstractThe temperature dependence of lattice parameters

Optical Determination of Thermal Conductivity with a Plane Source Technique

1968 ◽  
Vol 23 (5) ◽  
pp. 682-686 ◽  
Author(s):  
Silas E. Gustafsson ◽  
Nils-Olov Halling ◽  
Rolf A. E. Kjellander
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Temperature Dependence ◽  
Theoretical Approach ◽  
Experimental Results ◽  
Plane Source ◽  
Melting Points ◽  
Temperature Range ◽  
Optical Determination

The thermal conductivity and the thermal diffusivity of the three alkali nitrates LiNO3 , RbNO3 and CsNO3 have been measured over a temperature range between 50° and 100 °C above their melting points. Any temperature dependence of the thermal conductivity cannot be established for any of the investigated liquids but the results indicate that it must be less than 10-3 °C-1. The experimental results are compared with the conductivities which can be calculated with already excisting theories. A somewhat modified theoretical approach is suggested for estimating the thermal conductivity, where no adjustable parameters are being used. The experimental and theoretical values at the melting points agree within about 10 percent.

scholarly journals Structural and optical characterization of the crystalline phase transformation of electrospinning TiO2 nanofibres by high-temperatures annealing

2019 ◽  
Vol 65 (5 Sept-Oct) ◽  
pp. 459
Author(s):  
O. Secundino-Sánchez ◽  
J. Diaz-Reyes ◽  
J. F. Sánchez-Ramírez ◽  
And J.L. Jiménez-Pérez
Keyword(s):  
Phase Transformation ◽  
Raman Scattering ◽  
High Temperatures ◽  
Crystalline Phase ◽  
Annealing Temperature ◽  
Crystal Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Range ◽  
Wide Range

The electrospinning technique has been used to synthesize TiO2 nanofibres, which by annealing at high temperatures in a wide range achieves the crystal phase transformation of anatase to rutile passing through the anatase+rutile mixed. The investigated temperature range was 0-1000°C. The TiO2 nanofibres chemical stoichiometry and surface morphology were obtained by Scanning Electron Microscopy and Energy Dispersive Spectrometry. The nanofibres diameter was ranged from 137.0 to 115.3 nm in the annealing temperature interval of 0-1000°C. The influence of the annealing temperature on the structure and crystal phase quality of the TiO2crystal has been investigated by X-ray diffraction and Raman scattering. Clear evidence of nanofibres structural transformation from pure anatase to pure rutile structures, including the quasi-amorphous and anatase+rutile mixed phases has been confirmed by Raman scattering. By X-ray diffraction was found that the nanofibres crystalline phases present as preferential growth direction (101) for anatase and (110) for rutile. The Raman spectroscopy exhibits the anomalous behaviour for band broadening and shifting of Raman bands with increasing crystallite size that form the nanofibres. The room-temperature photoluminescence presents radiative bands whose main band redshifts, from 2.56 to 1.32 eV, as the crystalline phase transforms in the investigated annealing temperature range.

Studies of the Vulcanization of High Elastic Polymers. V. Vulcanization of Natural Rubber by Tetramethylthiuram Monosulfide and Sulfur

1956 ◽  
Vol 29 (1) ◽  
pp. 48-62 ◽  
Author(s):  
Walter Scheele ◽  
Georg Bielstein
Keyword(s):  
Natural Rubber ◽  
Temperature Dependence ◽  
Order Reaction ◽  
Experimental Results ◽  
First Order Reaction ◽  
First Order ◽  
Temperature Range ◽  
Quantitative Formation ◽  
Energy Relationships

Abstract The vulcanization of natural rubber (pale crepe) by tetramethylthiuram monosulfide and sulfur (1 mole monosulfide per gram-atom of sulfur) has been studied in the temperature range from 90° to 150° C. The following results were obtained : 1. During vulcanization, the concentration of the thiuram monosulfide and also of the sulfur decreases. 2. In accordance with a first-order reaction, about 66 mole-per cent of zinc dithiocarbamate is formed (calculated on the amount of thiuram monosulfide added). Thus the same relationships were found as in vulcanization with thiuram disulfides. 3. The vulcanization of rubber with thiuram monosulfide and sulfur is, therefore, nothing else than vulcanization by thiuram disulfide, whose quantitative formation precedes the actual vulcanization reaction. 4. In no stage of vulcanization could thiuram disulfide be detected with certainty in the extracts of the vulcanizates. It must be assumed, therefore, that it reacts with the rubber instantly after it is formed. 5. The velocity constants derived for the dithiocarbamate formation at the various temperatures both from the experimental results and from the graphical presentations have been given, and their temperature dependence has been discussed. At lower temperatures, the influence of the prior interaction of the monosulfide with sulfur makes its influence on the energy relationships felt. 6. It is once more emphasized that in thiuram vulcanization it cannot be a question of a vulcanization with sulfur. In this connection we take a decided stand also with regard to the results of the more recent investigations of Craig and his coworkers.

scholarly journals The linear thermal expansion coefficient of Inconel 617 alloy

2021 ◽  
Vol 2119 (1) ◽  
pp. 012136
Author(s):  
Yu M Kozlovskii ◽  
S V Stankus
Keyword(s):  
Thermal Expansion ◽  
Initial Data ◽  
Temperature Dependence ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Reference Values ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Volumetric Properties ◽  
Inconel 617

Abstract The experimental results of a study of the thermal expansion of Inconel 617 alloy in the temperature range of 293.15-1460 K are presented. An anomalous change in the thermal expansion coefficient at high temperatures was detected. The initial data are obtained with an error within 3%. The approximation equations and the table of reference values for the temperature dependence of the volumetric properties are obtained.

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