AlN-C(石墨)复相材料微波衰减性能的研究  

Study on Microwave Attenuation Characteristics of AlN-C Composites

作　　者：步文博[1] 丘泰[2] 徐洁[2] 沈春英[2] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050 [2]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《电子元件与材料》2003年第2期1-3,共3页Electronic Components And Materials

基　　金：国防化工新材料重点科研项目

摘　　要：采用热压烧结工艺,通过合理的烧结温度及保温时间的控制,制备了性能优异的AlN-C复相微波衰减材料。通过网络分析仪、SEM等测试手段,研究了衰减剂C含量对AlN-C复相材料微波衰减性能的影响,结果表明,当衰减剂C含量极小时(w≤1.0 %),AlN-C复相材料不具备衰减电磁波的特性;当衰减剂C含量为3.0 %～5.0 %时,AlN-C复相材料呈现良好的宽频衰减特性;当衰减剂C含量大于7.0 %时,AlN-C复相材料呈现明显的选频衰减特性,且随着C含量的增加,材料的衰减量增大,有效衰减带宽减小,中心谐振频率f0有向高频漂移的趋势。对AlN-C复相材料的频谱特性进行了初步的分析。探讨了AlN-C复相材料的微波衰减机理,电导损耗、界面极化损耗是其主要的微波衰减机理。AlN-C composites with excellent microwave attenuation characteristics were prepared by hot-pressing under the reasonable controls of sintering temperature and soaking time with the AlN and C powder as starting powder. The effect of the content of attenuator C on the microwave attenuation characteristics of AlN-C composites was investigated by network analyzer and SEM. The results show that: when the content of the attenuator C is very low(w ≤ 1.0%), AlN-C composites has not attenuate electromagnetic wave performance. When the content of attenuator C is in the range of 3.0 to 5.0 %, AlN-C composites represents the wide frequency band attenuation performance favorably. When the content of attenuator C is more than 7.0 %, AlN-C composite represents the narrow frequency band attenuation performance obviously. At the same time with the content of C increasing, the attenuation increases, the effective attenuation bandwidth decreases gradually and the center resonant frequency f0 will shift to high frequency. The dielectric characteristics of AlN-C composites are also analyzed. The mechanisms of microwave attenuation mainly ascribe to the electric conductive loss and the interfacial polarization loss.

关 键 词：氮化铝 石墨 微波衰减材料 热压法 AW-C复相材料 

分 类 号：TQ174.756[化学工程—陶瓷工业]