钨对AlN基复相材料微波衰减性能影响的研究

Effect of Tungsten on Microwave Attenuation of AlN-Based Composites

以AlN和W为原料,Y2O3为烧结助剂,在1850℃的N2气氛下热压烧结制备AlN-W复相衰减材料。运用XRD,SEM,网络分析仪等测试手段,研究了W含量、制备工艺对材料的显微结构、相组成、烧结性能及微波衰减性能的影响。结果表明,AlN-W复相衰减材料的衰减量随W含量的增加而增加,当W含量低于40%时呈现选频衰减特性,而当W含量继续增加到50%时呈现良好的宽频衰减,且衰减量最高达到-1.9 dB。探讨了AlN-W复相衰减材料的主要衰减机制。

A1N-W composites were prepared by hotpressing at 1850℃ for 1 h in a nitrogen atmosphere. The effect of W contents on microwave attenuation, microstructure of materials, phase composition and sintering performance .was studied by XRD, scanning electron microscopy and network analyzer. The results show that atuenuation performance is changed with the content of W. There are narrow frequency band attenuation performances with mass fraction of W lower than 40%, while there are wide frequency band attenuation performances with W content of 50%. The maximal value of attenuation is about - 1.9 dB. The mechanism of microwave attenuation was primarily discussed.