摘要
以溶胶-凝胶、碳热还原法制备了SiC／Al2O3纳米复相粉体，研究了处理温度对粉体相组成的影响及其在8．2～12．4GHz频率范围的介电性能。凝胶先驱体经1700℃处理可得到SiC／Al2O3复相粉体，粉体为300～400nm的球形颗粒，由晶粒尺寸约为45ilm的SiC和Al2O3纳米微晶组成；研究结果表明：Al原子未能固溶于SiC晶格中，导致随着粉体中Al含量的增加，复相粉体中Al2O3的量增加，粉体的复介电常数和介电损耗角正切降低。
To the best of our knowledge, there is no paper in the open literature dealing with the preparation of SiC-Al2O3 nanoeomposite powder with the method of sol-gel and earbonthermal reduction. We aim to explore preparing such nanoeomposite powder with the above-mentioned procedure and then investigate the variation of its microwave permittivity with aluminum content in the frequency range of 8.2-12.4 GHz. The powder synthesized at 1 700℃ in the atmosphere of argon consists of globose particles 300 - 400 nm in diameter, which, in their turn, consist of SiC and Al2O3 mieroerystals approximately 45 nm in diameter. The atom of aluminum cannot resolve in the lattice of SiC; this induces hoth ε＇, the real part of complex permittivity, and the dissipation factor tgδ＇ to decrease with increasing aluminum content, tgδ denotes ε＂/ε＇, where ε＂ is the imaginary part of permittivity.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2006年第1期128-131,共4页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金(50572090)资助
