| Preparation and dielectric properties of porous silicon nitride ceramics |
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| 引用本文： | 李军奇 罗发 朱冬梅 周万城. Preparation and dielectric properties of porous silicon nitride ceramics[J]. 中国有色金属学会会刊, 2006, 16(B02): 487-489 |
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| 作者姓名： | 李军奇 罗发 朱冬梅 周万城 |
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| 作者单位： | State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi＇an 710072, China |
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| 基金项目： | Project （50572090） supported by the National Natural Science Foundation of China |
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| 摘 要： | Porous silicon nitride ceramics with difference volume fractions of porosity from 34.1% to 59.2% were produced by adding different amount of the pore-forming agent into initial silicon nitride powder. The microwave dielectric property of these ceramics at a frequency of 9.36 GHz was studied. The crystalline phases of the samples were determined by X-ray diffraction analysis. The influence of porosity on the dielectric properties was evaluated. The results show that α-Si3N4 crystalline phase exists in all the samples while the main crystalline phase of the samples is β-Si3N4, indicating that the αβ transformation happens during the preparation of samples and the transformation is incomplete. There is a dense matrix containing large pores and cavities with needle-shaped and flaky β-Si3N4 grains distributing. The dielectric constant of the ceramics reduces with the increase of porosity.
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| 关 键 词： | 氮化硅 多孔陶瓷 制备 介电性质 成孔剂 |
| 收稿时间： | 2006-04-10 |
| 修稿时间： | 2006-04-25 |
Preparation and dielectric properties of porous silicon nitride ceramics |
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| LI Jun-qi, LUO Fa, ZHU Dong-mei, ZHOU Wan-cheng. Preparation and dielectric properties of porous silicon nitride ceramics[J]. Transactions of Nonferrous Metals Society of China, 2006, 16(B02): 487-489 |
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| Authors: | LI Jun-qi LUO Fa ZHU Dong-mei ZHOU Wan-cheng |
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| Abstract: | |
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| Keywords: | silicon nitride pore-forming agent porosity geometry dielectric properties |
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