FeNi@CNOs/AlN复合材料的制备及其吸波性能

核壳结构的碳材料具有优异的吸波性能,但是在陶瓷基体中难以分散均匀.本研究通过化学气相沉积法在氮化铝陶瓷机体中引入磁性纳米洋葱碳,制备了FeNi@CNOs/AlN复合材料,研究了其相组成、微观形貌和吸波性能.结果表明,1100 K下基于Al粉与C粉,FeNi催化剂的存在可原位生成FeNi@CNOs/AlN复合材料;10wt;FeNi@CNOs/AlN复合材料在8.29～15.32 GHz范围内,其RL值均低于-10 dB,在13.2 GHz处达到最大值为-23 dB.

Fabrication and Microwave Absorption Properties ofFeNi@CNOs/AlN Composites

Core shell structured carbon materials possess excellent microwave absorption properties,however they are very difficult to be dispersed in ceramic matrixs.FeNi@CNOs/AlN composites were fabricated through introducing magnetic carbon nano onions into AlN ceramic matrix by chemical vapor deposition process,and the phase composition,micro morphology and microwave absorption properties also were studied.The results show that,FeNi@CNOs/AlN composites can be fabricated in situ based on Al and C powders with the exits of FeNi catalyst under 1100 K.The RL values of as fabricated 10wt% FeNi@CNOs/AlN composites are all below -10 dB during 8.29-15.32 GHz,and the max value reaches-23 dB at 13.2 GHz.