TITLE:
Anisotropic Thermal Diffusivity Measurements in High-Thermal-Conductive Carbon-Fiber-Reinforced Plastic Composites
AUTHORS:
Masaya Kuribara, Hosei Nagano
KEYWORDS:
AC Calorimetric Method, Anisotropy, Carbon-Fiber-Reinforced Polymers, High Thermal Conductivity, Thermal Diffusivity
JOURNAL NAME:
Journal of Electronics Cooling and Thermal Control,
Vol.5 No.1,
March
26,
2015
ABSTRACT: This
paper presents the temperature dependence of in-plane thermal diffusivity and
anisotropy distribution for pitch-based carbon-fiber-reinforced polymers
(CFRPs). The measurement was performed using the laser-spot periodic heating
method. The samples were unidirectional (UD) and crossply (CP) CFRPs. All
carbon fibers of the UD samples ran in one direction, while those of the CP
samples ran in two directions. In both UD and CP CFRPs, from -80°C to +80°C, temperature
dependence of thermal diffusivity values increased as temperature decreased. In
this temperature range, the anisotropic ratio between the fiber direction and
its perpendicular direction of the UD CFRP was 106 - 124. During the anisotropy
distribution measurement, it was found that thermal anisotropy can be
visualized by scanning the laser in a circle on the sample. The thermal
diffusivity of the UD CFRP in the fiber direction was 17 times larger than that
in the 15° direction, and the thermal diffusivity in the other directions was
lower than that in the 15° direction. The anisotropy distribution for the CP
CFRP reflected its inhomogeneous structure.