Abstract
The graphite block as a phase change materials (PCMs) was manufactured by graphitization of a carbon block. Carbon blocks were prepared by filler (cokes or graphite) and binder (pitch). The binder-coated filler was thermally treated for carbonization. The gases generated from the evaporation of low molecular weight components in the binder pitch during the carbonization process were not released to the outside. Consequently, porosity and volume expansion were increased in artificial graphite, and thereby the thermal conductivity decreased. In this study, to prevent the decrease of thermal conductivity in the artificial graphite due to the disadvantages of binder pitch, the carbon block was prepared by the addition of carbon black, which can absorb low molecular weight compounds and release the generated gas. The properties of the prepared carbon blocks were analyzed by SEM, TGA, and thermal conductivity. The addition of carbon black (CB) decreased the porosity and volume expansion of the carbon blocks by 38.3% and 65.9%, respectively, and increased the thermal conductivity by 57.1%. The CB absorbed the low molecular weight compounds of binder pitch and induced the release of generated gases during the carbonization process to decrease porosity, and the thermal conductivity of the carbon block increased.
Highlights
Phase change materials (PCMs), which are applied to biotech industries such as temperature-sensitive food transport and biomedical applications, require materials with high thermal conductivity
Carbon blocks were prepared by binder pitch and natural graphite flakes, and carbon black (CB) was added to increase the thermal for the application biomedical
Graphite flakes, CBtowas process with binder pitch and natural graphite flakes (NGF) to prepare a mixture for carbon blocks
Summary
Phase change materials (PCMs), which are applied to biotech industries such as temperature-sensitive food transport and biomedical applications, require materials with high thermal conductivity. Graphite has been used as a PCM based on its high thermal conductivity, excellent mechanical properties, good chemical stability, and low thermal expansion [1,2,3]. The artificial graphite is advantageous to apply to PCMs because it is easy to control its size and properties [4,5,6,7,8]. Natural graphite (NG) has been used instead of coke filler to prepare carbon blocks owing to its high degree of graphitization and high thermal stability [9,10,11]. The use of NG circumvents high-temperature graphitization; as a result, it could simplify the preparation process, save energy, and reduce costs [12]
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