The Control of Volume Expansion and Porosity in Carbon Block by Carbon Black (CB) Addition for Increasing Thermal Conductivity
C1 Gas & Carbon Convergent Research, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Korea
Department of Applied Chemical Engineering, Chungnam National University, Daejeon 34134, Korea
Strategic Planning Division, Korea Institute of Convergence Textile, Iksan 54588, Korea
Advanced Materials and Chemical Engineering, University of Science and Technology (UST), Daejeon 34113, Korea
Authors to whom correspondence should be addressed.
Appl. Sci. 2020, 10(17), 6068; https://doi.org/10.3390/app10176068
Received: 11 August 2020 / Revised: 26 August 2020 / Accepted: 31 August 2020 / Published: 1 September 2020
(This article belongs to the Special Issue Polymeric Adhesives for Biomedical Applications)
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.