摘要
以Mg2SiO4和SiC为原料,Al2O3-BaO-SiO2作为复合烧结助剂,H2气氛下在1450℃下保温1 h常压烧结制备出了Mg2SiO4-SiC复相微波衰减材料;采用X射线衍射、扫描电子显微镜对复相材料的相组成、显微结构进行表征。研究了SiC添加量对复相材料X波段(8～12 GHz)微波衰减性能的影响。结果表明:通过加入一定量的Al2O3-BaO-SiO2复合烧结助剂能有效促进烧结致密化,复相材料的显气孔率均在0.5%以下;SiC含量从0增加到10%,复相材料谐振频率由11.8 GHz递减到10.0 GHz,衰减峰值的绝对值由3.62 dB递减到1.18 dB,有效衰减带宽由0.48 GHz递增到1.03 GHz,随着SiC含量的增加,谐振频率向低频移动,衰减峰绝对值降低,有效衰减带宽增大。
Mg2SiO4-SiC composite materials were prepared by pressureless sintering at 1450 ℃ for 1 h under H2 atmosphere using Mg2SiO4,SiC as raw materials and Al2O3-BaO-SiO2 as composite sintering additives.The phase composition and microstructure of composite materials were characterized by X-ray diffraction（XRD）,scanning electron microscope（SEM）.The effects of SiC addition on the microwave characteristics in X band（8-12 GHz） were investigated.The results show that a certain amount of Al2O3-BaO-SiO2 composite sintering additives are effective in promoting densification,the apparent porosity of composite materials is below 0.5%.As the SiC content increased from 0 to 10%,the harmonic frequency decreases from 11.8 GHz to 10.0 GHz,at the same time,absolute value of the attenuation peak decreases from 3.62 dB to 1.18 dB and effective attenuation bandwidth increases from 0.48 GHz to 1.03 GHz.The harmonic frequency of composites shifts to a low frequency attenuation peak,the effective attenuation bandwidth increases.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2011年第4期973-977,共5页
Journal of Synthetic Crystals
基金
国防科工委基金资助项目
关键词
常压烧结
复相材料
微波衰减性能
pressureless sintering
composite materials
microwave attenuation performance
