Measurement of the thermal properties of Li2CO3, Na2CO3, K2CO3, CaCO3, MgCO3, and NiCO3 in the temperature range 300-700 K by the heat-flash technique

1995 ◽  
Vol 27/28 (1) ◽  
pp. 41-45
Author(s):  
Abdelsalam Abousehly ◽  
Mohamed Ibrahiem ◽  
Mohamed Desouky ◽  
Afaf Abdel-Rahman ◽  
Mohamed Tag-Alden ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Temperature Range ◽  
Flash Technique

Thermal properties of poly(vinilidene fluoride) in the temperature range from 25 to 210 °C

2008 ◽  
Vol 27 (2) ◽  
pp. 204-208 ◽  
Author(s):  
W.N. dos Santos ◽  
C.Y. Iguchi ◽  
R. Gregorio
Keyword(s):  
Thermal Properties ◽  
Temperature Range

The Effect of Sintering Temperature to the Properties of Zinc Oxide

2013 ◽  
Vol 795 ◽  
pp. 419-423 ◽  
Author(s):  
J.H. Lim ◽  
C.K. Yeoh ◽  
Pei Leng Teh ◽  
W.M. Arif ◽  
A. Chik
Keyword(s):  
Thermal Conductivity ◽  
Zinc Oxide ◽  
Thermal Properties ◽  
Solid State ◽  
Sintering Temperature ◽  
Solid State Method ◽  
Influence Of Temperature ◽  
Temperature Range ◽  
Influence Of Temperature On ◽  
State Method

In this paper, different sintering temperature used to study the influence of temperature on the structural and thermal properties of zinc oxide (ZnO). On this research, the sample was prepared by solid-state method for zinc oxide (ZnO) at different sintering temperature which was 700°C, 800°C and 900°C. It was observed that the density of bulk ZnO that sintering at 900°C had the higher value of density 5.03 g/cm3. The microhardness of the bulk ZnO had a higher measurement 397.3 Hv after sintered at 900°C. ZnO that sintering at 900°C had been observed that had thermal conductivity 1.1611W/cm-K in the sintering temperature range 700°C to 900°C.

Comparison of thermal properties of fish collagen and bovine collagen in the temperature range 298–670 K

2017 ◽  
Vol 80 ◽  
pp. 468-471 ◽  
Author(s):  
Marlena Gauza-Włodarczyk ◽  
Leszek Kubisz ◽  
Sławomir Mielcarek ◽  
Dariusz Włodarczyk
Keyword(s):  
Thermal Properties ◽  
Temperature Range ◽  
Bovine Collagen ◽  
Fish Collagen

Thermal polymerization of arylacetylenes: spectroscopic and thermal studies

1994 ◽  
Vol 6 (4) ◽  
pp. 347-383 ◽  
Author(s):  
Marie-Florence Grenier-Loustalot
Keyword(s):  
Thermal Properties ◽  
Reaction Mechanisms ◽  
Thermal Studies ◽  
Thermal Polymerization ◽  
Temperature Range ◽  
H Nmr ◽  
Kinetics Of ◽  
Competing Reactions

The reaction mechanisms and kinetics of endcapped ethynyl polyethers were studies in the temperature range 150-220C. The results obtained by '3C and 'H NMR, FrTIR, HPLC and DSC indicate reactivity differences and competing reactions. These materials were cured and their thermal properties evaluated.

Mechanical and thermal properties of the glassy semiconductor chlorinated Se0 997As0 003 used as an X-ray imaging material

1989 ◽  
Vol 67 (7) ◽  
pp. 686-693 ◽  
Author(s):  
S. O. Kasap ◽  
S. Yannacopoulos
Keyword(s):  
Thermal Properties ◽  
Structural Changes ◽  
Relaxation Times ◽  
Thermal Relaxation ◽  
Mechanical And Thermal Properties ◽  
Debye Relaxation ◽  
X Ray ◽  
Temperature Range ◽  
Glass Transformation ◽  
X Ray Imaging

Mechanical and thermal properties of a typical X-ray imaging material amorphous Se0.997As0.003, chlorinated in the ppm range were investigated using thermal microhardness analysis (TμHA) and differential scanning calorimetry (DSC). The experiments were carried out over a temperature range encompassing the glass transformation to study the nature of structural changes controlling the mechanical and thermal properties. It is shown that the mechanical property microhardness when examined on an Itoh–Shishokin plot of log Vickers hardness number (VHN) vs. temperature (T) exhibits a hardness transition temperature, Tg*, in the glass transformation region. The rates of relaxation of the mechanical and thermal properties in the glass transformation region were studied by investigating the heating rate dependence of the glass transition temperatures, Tg* and Tg, defined empirically on the log VHN vs. T behavior and the DSC glass transformation endotherm, respectively. By applying the present thermoanalytical methods, it has proved possible to identify a typical Vogel–Tammann–Fulcher type of behavior in the mechanical and thermal relaxation times that correlates remarkably well with the viscosity–temperature data of M. Cukierman and D. R. Uhlmann (J. Non-Cryst. Solids, 12, 199 (1973)) as well as the dielectric loss experiments of M. Abkowitz, D. F. Pochan, and J. M. Pochan (J. Appl. Phys. 51, 1539 (1980)). The latter had previously exposed a Williams–Landel–Ferry relation for the Debye relaxation times in a-Se and a-Se: 1% As. It is therefore concluded that the behavior of mechanical, thermal, and dielectric properties of a-Se0997As0003 in the glass transformation region is inversely proportional to the viscosity, which in turn can be adequately described over a temperature range above ~30 °C by a Vogel expression.

Thermal properties of aqueous solutions of polyvinylpyrrolidone in the temperature range 20?80�C

1990 ◽  
Vol 11 (3) ◽  
pp. 515-523 ◽  
Author(s):  
A. Z. Dakroury ◽  
M. B. S. Osman ◽  
A. W. A. El-Sharkawy
Keyword(s):  
Thermal Properties ◽  
Aqueous Solutions ◽  
Temperature Range

Study of thermal properties of glass system 77% B2O3-23% PbO doped with ZnO in the temperature range 300 to 700 K

1990 ◽  
Vol 25 (1) ◽  
pp. 431-433 ◽  
Author(s):  
A. M. Abousehly ◽  
A. M. Abou-El-Azm ◽  
M. H. Wasfy ◽  
A. A. El-Sharkawy ◽  
M. B. Osman
Keyword(s):  
Thermal Properties ◽  
Glass System ◽  
Temperature Range

Characteristics of Thermal Properties of Gd2Zr2O7 – ZrO2XY2O3 Powder Mixtures Intended for Deposition of Gradient Layers of TBC Type

2011 ◽  
Vol 312-315 ◽  
pp. 577-582 ◽  
Author(s):  
Grzegorz Moskal ◽  
Lucjan Swadźba ◽  
Bartosz Witala
Keyword(s):  
Thermal Properties ◽  
Thermal Diffusivity ◽  
Specific Heat ◽  
Flash Method ◽  
Endothermic Effect ◽  
Equal Weight ◽  
Gradient Structure ◽  
Calorimetric Analysis ◽  
Powder Mixtures ◽  
Temperature Range

This article presents a study and results concerning the characteristics of selected thermal properties of the powders intended for deposition of gradient structure layers of the TBC type. The study included evaluation of the thermal diffusivity and specific heat of the powders in the initial state, and also calorimetric analysis of powder mixtures. Thermal diffusivity tests were performed with the laser-flash method. The temperature range of the tests was 25°C-1400°C. Specific heat and calorimetric analyses were performed with the heat flux method within a similar temperature range. The Gd2Zr2O7 powders obtained by spray drying method and standard ZrO2 x 8Y2O3 powder were analysed. The thermal diffusivity analysis and calorimetric analysis were performed for the samples obtained by pressing the Gd2Zr2O7 - ZrO2 x 8Y2O3 powder mixture of equal weight fractions. Specific heat measurements were taken for pure powders. The calorimetric analysis performed showed that no significant thermal effects were observed in both pure powders and their mixture within the temperature range of 800°C-1400°C. A small endothermic effect (approx.-7J/g) was observed for gadolinium powder within the temperature range of 350°C-615°C. Specific heat measurements revealed that gadolinium powder was characterized by stable values of that parameter within the whole temperature range like zirconium powder. The analyses performed showed that the powders were characterized by small mutual reactivity, and gadolinium powder showed a definitely lower thermal diffusivity, which is advantageous as regards obtaining TBC layers with a gradient structure on the basis of those two powders.

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