| Design,preparation, and structure of particle preforms for Si3N4（p）/Si3N4 radome composites prepared using chemical vapor infiltration process |
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| 作者姓名： | Yongsheng Liu Laifei Cheng Litong Zhang Yongdong Xu Yi Liu |
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| 作者单位： | National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi＇an 710072, China |
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| 基金项目： | 国家自然科学基金，国家自然科学基金，The National Young Elitist Foundation in China，西北工业大学校科研和教改项目 |
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| 摘 要： | A particle preform was designed and prepared by conglomerating and cold-pressed process, which was condensed by chemical vapor infiltration （CVI） process to fabricate silicon nitride particles reinforced silicon nitride composites. The conglomerations are of almost sphericity after conglomerated. There are large pores among the conglomerations and small pores within themselves in the preform according to the design and the test of pore size distribution. The pore size of the preform is characterized by a double-peak distribution. The pore size distribution is influenced by conglomeration size. Large pores among the conglomerations still exist after infiltrated Si3N4 matrix. The conglomerations, however, are very compact. The CVI Si3N4 looks like cauliflowershaped structure. 2008 University of Science and Technology Beijing. All rights reserved.
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| 关 键 词： | 化学结构 硅 化合物 化学特性 |
| 收稿时间： | 2007-01-23 |
Design, preparation, and structure of particle preforms for Si3N4(p)/Si3N4 radome composites prepared using chemical vapor infiltration process |
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| Yongsheng Liu Laifei Cheng Litong Zhang Yongdong Xu Yi Liu.Design, preparation, and structure of particle preforms for Si3N4(p)/Si3N4 radome composites prepared using chemical vapor infiltration process[J].Journal of University of Science and Technology Beijing,2008,15(1):62-66. |
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| Authors: | Yongsheng Liu Laifei Cheng Litong Zhang Yongdong Xu Yi Liu |
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| Affiliation: | aNational Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University, Xi'an 710072, China |
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| Abstract: | A particle preform was designed and prepared by conglomerating and cold-pressed process, which was condensed by chemical vapor infiltration (CVI) process to fabricate silicon nitride particles reinforced silicon nitride composites. The conglomera-tions are of almost sphericity after conglomerated. There are large pores among the conglomerations and small pores within them-selves in the preform according to the design and the test of pore size distribution. The pore size of the preform is characterized by a double-peak distribution. The pore size distribution is influenced by conglomeration size. large pores among the conglomerations still exist after infiltrated Si3N4 maul. The conglomerations, however, are very compact. The CVI Si3N4 looks like cauliflower-shaped structure. |
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| Keywords: | silicon nitride particle preform design microstructure chemical vapor infiltration (CVI) |
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