Abstract: Bamboo charcoal has certain electrical conductivity and the potential to be applied in the field of electrical materials. In order to improve the electrical conductivity of bamboo charcoal, this paper used insulating bamboo charcoal as the raw material for recarbonization.The physical and chemical properties and structure of bamboo charcoal after different temperatures recarbonization were studied.Elemental analyzer, calorimeter, specific surface area and porosity analyzer, infrared spectrometer, Raman spectrometer, X-ray diffractometer, scanning electron microscope and transmission electron microscope were used to measure the basic physical and chemical properties and microstructure of bamboo charcoal.The results showed that as the recarbonization temperature increased, the specific surface area of bamboo charcoal increased first and then decreased within the range of 700—1 500 ℃. The C content increased from 82.45% to 96.87%, the fixed carbon content increased from 81.22% to 96.3%, and the calorific value from 31.385 MJ/kg to 34.904 MJ/kg, the conductivity increased from 10-8 S/cm to 92.94 S/cm. The recarbonization reduced the polarity of bamboo charcoal and resulted in the formation of many macroporous structures on the fiber cap and cell wall. This feature of bamboo charcoal can be advantage for bamboo charcoal to be used as a reinforcing phase for composite materials. After the recarbonization, the bamboo charcoal formed curved graphite edges, and the degree of graphitization gradually increased with the increase of temperature. The crystallite size corresponding to the (002) peak of BC1500 was 0.334 nm, which was close to the graphite stripe spacing of 0.34 nm.The recarbonization significantly enhanced the conductivity of bamboo charcoal, which was the result of increased carbon content, further shrinkage of cell walls and fiber caps, and formation of curved graphite edges.Recarbonization provides a simple and efficient method for the preparation of high-quality charcoal.
江文正, 章卫钢, 子绚, 刘贤淼, 张文标, 李文珠. 二次炭化温度对竹炭导电性能及结构的影响[J]. 材料导报, 2021, 35(8): 8023-8027.
JIANG Wenzheng, ZHANG Weigang, ZI Xuan, LIU Xianmiao, ZHANG Wenbiao, LI Wenzhu. Effect of Recarbonization Temperature on Conductive Properties and Structure of Bamboo Charcoal. Materials Reports, 2021, 35(8): 8023-8027.
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2021, Vol. 35 
