摘要
以AlN和W为原料,Y2O3为烧结助剂,1850℃、N2气氛下热压烧结制备AlN-W复相衰减材料。运用XRD、SEM和矢量网络分析仪对AlN-W复相衰减材料的相组成、显微结构和衰减性能进行表征。研究了W含量对AlN-W复相衰减材料烧结性能与微波衰减性能的影响。结果表明,烧结性能随W含量的增加而变差;衰减量随W含量的增加而增加。W含量小于10w t%时呈现选频衰减;W含量10w t%-40wt%,呈多点选频衰减;W含量达到50wt%时,表现较好的宽频衰减。初步探讨了AlN-W复相材料微波衰减曲线的频谱特性与衰减机理。
AlN-W composites were prepared with Y2O3 additive by hot-pressing at the temperature of 1850℃ for 1 h under nitrogen atmosphere. The phase composition, micro-structure and microwave attenuation of AlN-W composites were characterized by XRD, SEM and network analyzer. The effects of W content on microstructure and microwave attenuation performance were studied. The results showed that sintering performance decreased with the content of W increasing; attenuation increased with the content of W increasing. There were single narrow frequency band attenuation performances with mass fraction of W less than 10wt% and many narrow frequency band attenuation performances with mass fraction of W between 10wt% and 40wt%, while there were wide frequency band attenuation performances with mass fraction of W more than 50wt%. The max value of attenuation is about 1.9dB. The characteristics of spectrum of microwave attenuation curves and mechanisms of microwave attenuation were discussed.
出处
《中国陶瓷工业》
CAS
2006年第4期22-25,共4页
China Ceramic Industry
基金
国防科工委基金项目资助
关键词
氮化铝
钨
微波衰减
aluminum nitride, tungsten, microwave attenuation
