材料工程Issue(2)：42-45,4.
CBS涂层对多孔氮化硅高温高频介电性能的影响
Effects of CBS Coating on Dielectric Properties of Porous Si3N4 Ceramic at High Temperature and High Frequency
孙雨薇 1王树彬 1张健2
作者信息
- 1. 北京航空航天大学,材料科学与工程学院,北京,100191
- 2. 北京航天材料及工艺研究所,先进功能复合材料技术国防科技重点实验室,北京,100076
- 折叠
摘要
Abstract
Compact moisture proof coating was fabricated with CaO-B2O3-SiO2 (CBS) glass ceramic on the porous silicon nitride substrate by sol-gel method. The dielectric constant and dielectric loss from 7.3GHz to 18.4GHz were tested from room temperature to 1200℃ by applying factor cylindrical cavity working in multimode before and after sealing. The result shows that, after coating, the dielectric constant is slightly higher and the fluctuation of dielectric loss decreases with frequency. At frequency of 9.2GHz the temperature coefficient of dielectric constant increases after coating. The dielectric loss is decreased by 60％ or more at room temperature after coating; the temperature stability of dielectric loss is improved by coating, and the demands of dielectric properties of radome are well satisfied.关键词
CaO-B2O3-SiO2涂层/氮化硅/多孔陶瓷/高频介电性能Key words
CaO-B2O3-SiO2 coating / silicon nitride / porous ceramic/ high-frequency dielectric property分类
航空航天引用本文复制引用
孙雨薇,王树彬,张健..CBS涂层对多孔氮化硅高温高频介电性能的影响[J].材料工程,2011,(2):42-45,4.
