摘要
在隔绝空气条件下对毛竹进行500℃、600℃、700℃、800℃、900℃的炭化处理,采用XRD、SEM、网络矢量分析仪对竹炭形貌、结构、电磁波吸收性能进行研究。结果表明,一方面升高炭化温度可促进竹炭中石墨微晶的生长和提高石墨层面排列的规整性,从而提高竹炭的电导率,另一方面通过改变炭化温度可调节竹炭介电常数和磁导率,进而改善其电磁波吸收性能;炭化温度为800℃的竹炭,吸收频段较宽,电磁波吸收效果最好,因此,竹炭粉粒是一种同时存在电损耗和磁损耗的轻质电磁波吸收剂,不规则的外形和大量孔径不同的孔隙所产生的内反射作用有利于提高其电磁波吸收性能。
Through the carbonization of bamboo at 500℃, 600℃, 700℃, 800℃, 900℃ in vacuum and studying on the morphology, structure and electromagnetic wave absorption properties of bamboo charcoal powder by XRD, SEM and vector network analyzer, the result show that with the increase of the temperature, the conductivity of bamboo charcoal powder increase because of the growth of graphite Crystallite and the orderliness of graphite level, at the same time. Dielectric constant, magnetic permeability and electromagnetic waves absorption properties can be adjusted by the change of the carbonization temperature. The bamboo charcoal powder at 800℃ has the best electromagnetic absorption properties with a wide absorption band. Therefore bamboo charcoal powder has both dielectric loss and magnetic loss, and the irregular appearance and different aperture of which can improve the electromagnetic wave absorption properties.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2010年第24期5-8,共4页
Materials Reports
基金
十一五国家科技支撑计划课题(2006BAD19B06)
关键词
竹炭
炭化温度
吸收剂
吸波性能
bamboo charcoal, carbonization temperature, absorption materials, wave absorption properties
