期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 141, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jaap.2019.104643
关键词
Coal tar pitch; Carbon foam; Thermal insulation; Oxidation resistance; Pore structure
资金
- High-level Talent Training Program in Guizhou Province [[2016]5658]
- Major applied basic research project in Guizhou province [[2014] 2004]
- Science and technology major projects of Guizhou province [[2015] 6011]
This report proposes a new method for fabricating tailored coal tar pitch (CTP) precursors to enhance the oxidation-resistant thermal insulation performance of the final carbon foam. A gradient separation method is used to produce controllable CTP using low-temperature coal tar at temperatures between 340 degrees C and 460 degrees C. The effects on the chemical composition, pyrolysis, and rheological behaviour of CTP through the treatment temperature and removal of low-molecular weight species by gradient separation and its distillate were analysed. The results revealed that the chemical compositions of suitable CTPs can be tailored using the gradient selectivity separation method, which decreases the viscosity of CTP and facilitates the growth of bubbles for the preparation of carbon foams during the foaming process. The performance of the carbon foam depends on the pore structure. Carbon foams with pentagonal dodecahedron pore structures showed excellent thermal insulation performance (0.028-0.053 Wm(-1).K-1). The carbon foams also exhibited good oxidation resistance at 1000 degrees C in air, as there is no transitional pore system for oxidizing gas diffusion in the pentagonal dodecahedron structure, and the oxidation reaction occurs on the surface of the carbon foam.
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