Abstract
Highly conductive fillers have a strong influence on improving the poor out of plane thermal conductivity of carbon fiber reinforced composites. The objective of this study has been to investigate the role of the diamond powder (DP) in enhancing the out-of-plane thermal conductivity of the woven composites. Samples of the standard modulus T300 carbon fiber composite with 44% and 55% fiber volume fraction and the high modulus YS90A carbon fiber composite with 50% volume fraction were fabricated with their matrices comprising of neat epoxy and different loading of diamond powder within epoxy resin. Steady state thermal conductivity measurements were carried out and it was found from the measurements that the out of plane thermal conductivity of the standard modulus composite increased by a factor of 2.3 with 14% volume fraction of diamond powder in the composite while the out of plane thermal conductivity of the high modulus composite increased by a factor of 2.8 with 12% volume fraction of diamond powder in the composite. Finite Element Modeling (FEM) with the incorporation of microstructural characteristics is presented and good consistency between the measurements and FEM results were observed.
Highlights
Polymer-matrix composites with continuous carbon fiber are important for many high technology industrial or research applications
Finite Element Modeling (FEM) results T300 composite with fiber volume fraction of 44% shown in the Figure 8 and Table 4 predicted the lack of improvement in thermal conductivity at lower diamond powder content
The out of plane thermal conductivity of the standard modulus T300 and the high modulus YS90A woven composites were examined by FEM and thermal measurements
Summary
Polymer-matrix composites with continuous carbon fiber are important for many high technology industrial or research applications. The research and development reported in this paper have been conducted in the framework of the experiments for particle physics, such as at the Large Hadron Collider (LHC) [2] at the European Organization for Nuclear Research (CERN). Light weight but very stable support structures for high precision sensors are required with the additional constraint to remove the heat produced from the read-out electronics and the sensors themselves. Carbon fiber reinforced composites are used in this case to provide mechanical support and protection from thermal runaway of the detector. This study has been intended to investigate the improvements of thermal properties of the composite, with the intention of improving the thermal behavior of the support structure (Figure 1) of pixel detector of the ATLAS experiment [3] at the LHC
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