Effect of radiation of an Ra-?-Be-source on the temperature coefficient of linear expansion of solid solutions of the system KCL-KBr

1973 ◽  
Vol 16 (9) ◽  
pp. 1197-1199
Author(s):  
M. S. Ivankina
Keyword(s):  
Temperature Coefficient ◽  
Solid Solutions ◽  
Linear Expansion ◽  
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 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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