Microstructure, mechanical and dielectric properties of highly porous silicon nitride ceramics produced by a new water-based freeze casting
Microstructure, mechanical and dielectric properties of highly porous silicon nitride ceramics produced by a new water-based freeze casting
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新型水基冷冻铸造生产的高多孔氮化硅陶瓷的微观结构、机械和介电性能
DOI：
10.1016/j.ceramint.2012.01.012
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发表时间：
2012-07
影响因子：
5.2
通讯作者：
Rubing Zhang, Daining Fang, Yongmao Pei, Licheng
中科院分区：
文献类型：
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作者：
Rubing Zhang, Daining Fang, Yongmao Pei, Licheng
采用新型水基冷冻铸造法制备了不同固含量的新型梯度多孔氮化硅陶瓷。在多孔层上成功地形成了25μ m厚的表面致密层，没有任何明显的缺陷。在体积分数为20- 25%的Si_3N_4多孔陶瓷中，观察到大量的纤维状颗粒从宏观取向的孔道内壁突出固含量为15 vol.%的试样中，纤维状颗粒较少固体含量在相似的工艺路线。随着固含量从15体积%增加到25体积%，孔隙率从76.8%下降到66.4%，抗弯强度和10 GHz下的介电常数分别从14.3MPa和1.78增加到33.5MPa和2.64。致密/多孔Si 3 N4陶瓷具有超低的介电常数和适中的强度，可用于高温宽带天线罩。
Novel graded porous Si3N4ceramics with different solid content have been fabricated by a new water-based freeze-casting method. A 25μm-thick surface dense layer on the porous layer was successfully formed without any noticeable defects. A great number of fibrous grains protruding from the internal walls of the macroscopic aligned channels were observed in the porous Si3N4samples with 20–25vol.% solid content, but little fibrous grains were formed in the sample with 15vol.% solid content at the similar processing route. As the solid content increasing from 15 to 25vol.%, the porosity decreased from 76.8% to 66.4%, while the flexural strength and dielectric constants at 10GHz increased from 14.3MPa to 33.5MPa and 1.78 to 2.64, respectively. The dense/porous Si3N4ceramic is feasible in broadband radomes application at high temperature due to ultra-low dielectric constants and moderate strength.
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影响因子：
3.9
作者：
Young-Hag Koh;In-Kook Jun;Jong-Jae Sun;Hyoun‐Ee Kim
通讯作者：
Young-Hag Koh;In-Kook Jun;Jong-Jae Sun;Hyoun‐Ee Kim
影响因子：
3.9
作者：
J. She;Jianfeng Yang;D. Jayaseelan;N. Kondo;T. Ohji;S. Kanzaki;Y. Inagaki
通讯作者：
J. She;Jianfeng Yang;D. Jayaseelan;N. Kondo;T. Ohji;S. Kanzaki;Y. Inagaki
影响因子：
3.9
作者：
M. Backhaus-Ricoult;V. Guérin;A. Huntz;V. Urbanovich
通讯作者：
M. Backhaus-Ricoult;V. Guérin;A. Huntz;V. Urbanovich
影响因子：
3.9
作者：
Yumin Zhang;Luyang Hu;Jiecai Han
通讯作者：
Yumin Zhang;Luyang Hu;Jiecai Han
DOI：
10.1016/0025-5416(85)90236-8
发表时间：
1985-01-01
期刊：
MATERIALS SCIENCE AND ENGINEERING
影响因子：
--
作者：
BARTA, J;MANELA, M;FISCHER, R
通讯作者：
FISCHER, R