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.
Highlights
High-thermal-conductive carbon-fiber-reinforced polymers (CFRPs) have recently been proposed as base material for thermal control devices in spacecraft [1]
CFRPs can have large anisotropy depending on the direction of the carbon fibers, and are used over a wide temperature range
The thermal diffusivity of the CP CFRP was larger than the average of the thermal diffusivity of UD// and UD⊥
Summary
High-thermal-conductive carbon-fiber-reinforced polymers (CFRPs) have recently been proposed as base material for thermal control devices in spacecraft [1]. Wrobel [2] reported thermal diffusivity measurements in the out-of-plane direction at room temperature for a PAN-based CFRP by a flash method. Ellis [3] measured the temperature dependence of thermal diffusivity parallel and perpendicular to the fiber directions of PAN-based carbon fibers and copper matrix composites by using a laser flash method. Mirmira [4] measured the temperature dependence of thermal conductivity for PAN-based CFRPs by using a steady method. This paper presents the temperature dependence of in-plane thermal diffusivity and anisotropy distribution for pitch-based CFRPs. In the measurements, a laser-spot periodic heating method was selected to evaluate in-plane anisotropy
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