Temperature coefficient of linear expansion on an interference dilatometer over the temperature range ?60?60�C

1980 ◽  
Vol 23 (1) ◽  
pp. 51-53
Author(s):  
I. M. Buzhinskii ◽  
Zh. G. Zhukovets ◽  
I. I. Yakovleva
Keyword(s):  
Temperature Coefficient ◽  
Linear Expansion ◽  
Interference Dilatometer ◽  
Temperature Range ◽  
Coefficient Of Linear Expansion

Heat conductivity and temperature coefficient of linear expansion of fluorite

1979 ◽  
Vol 22 (8) ◽  
pp. 968-969 ◽  
Author(s):  
V. G. Kuz'min ◽  
G. V. Ivanova ◽  
O. V. Morozova ◽  
B. A. Savchenko
Keyword(s):  
Temperature Coefficient ◽  
Heat Conductivity ◽  
Linear Expansion ◽  
Coefficient Of Linear Expansion

scholarly journals Temperature Dependences of Structural Parameters of PMN in the Region of Diffuse Phase Transition

2020 ◽  
Vol 329 ◽  
pp. 02037
Author(s):  
Alla Lebedinskaya ◽  
Angela Rudskaya
Keyword(s):  
Diffuse Phase Transition ◽  
Linear Expansion ◽  
Structural Parameters ◽  
Potential Relief ◽  
Abrupt Decrease ◽  
X Ray ◽  
Temperature Range ◽  
Temperature Dependences ◽  
Coefficient Of Linear Expansion ◽  
Diffuse Phase

In this work, we analyzed the structural parameters of the lead magnoniobate sample in the temperature range from 20 ºC to 450 ºC by X- ray structural analysis. It was found that the PMN cubic perovskite cell does not undergo distortions over the entire temperature range under study. In the vicinity of a temperature of 250 ºC in PMN, an abrupt decrease in the coefficient of linear expansion from 1.06∙10-5 K-1 to 0.32∙10-5 K-1, which is possibly associated with a change in the anharmonicity of the potential relief of atoms in the structure, is recorded.

scholarly journals GENERATION OF NANO-FILLED EPOXY-POLYESTER COMPOSITE MATERIALS FOR PROTECTION OF ELEMENTS OF VESSEL TECHNICAL MEANS

2020 ◽  
Vol 1 (22) ◽  
pp. 154-162
Author(s):  
M. Brailo ◽  
◽  
S. Yakushchenko ◽  
O. Kobelnik ◽  
N. Buketova ◽  
...  
Keyword(s):  
Composite Material ◽  
Silicon Dioxide ◽  
Heat Resistance ◽  
Temperature Coefficient ◽  
Thermophysical Properties ◽  
Linear Expansion ◽  
Technical Equipment ◽  
Thermal Coefficient ◽  
Coefficient Of Linear Expansion ◽  
Pyrogenic Silicon Dioxide

The influence of nanofillers on thermophysical properties of epoxy-polyester composites has been investigated in the work. The filler content (oxidized nanodisperse additive and pyrogenic silicon dioxide) has been varied within q = 0.02…1.0 pts.wt. per 100 pts.wt. of epoxy oligomer ED-20. It has been discovered that the introduction of the oxidized nanodisperse additive in the amount of q = 0.05…0.08 pts.wt. into the epoxy-polyester binder leads to an improvement in the thermophysical properties of the composite. Value of heat resistance (according to Martens) increased from Т = 335 К (for the epoxy-polyester matrix) to T = 346 K at the content of oxidized nanodisperse additive of q = 0.075 pts.wt. Introduction of q = 0.05 pts.wt. of oxidized nanodisperse additive allows to obtain improved values of the temperature coefficient of linear expansion in different temperature ranges: in the region ΔT = 303…323 K – α = 1.0 × 10-5 K-1, in the region ΔT = 303… 373 K - α = 1.9 × 10-5 K-1, in the region ΔT = 303… 423 K – α = 3.4 × 10-5 K-1. It has been determined that the composite material has also improved its heat resistance (according to Martens), which is T = 347 K and the minimum thermal coefficient of linear expansion at the content of q = 0.05 pts.wt. of pyrogenic silicon dioxide nanofiller. Values of the temperature coefficient of linear expansion were: α = 1.0 × 10-5 K-1 in the region (ΔT = 303… 323 K), α = 1.9 × 10-5 K-1 (in the region ΔT = 303… 373 K), Δα = 3.4 ×× 10-5 K-1 (in the region ΔT = 303… 423 K), α = 8.4 × 10-5 K-1 (in the region ΔT = 303… 473 K). It is recommended that in order to form a composite material with improved thermophysical properties to protect the elements of ship technical equipment, it is advisable to introduce the pyrogenic silicon dioxide nanofiller in the amount of q = 0.05 pts.wt. into the epoxy-polyester binder.

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