Design, preparation, and structure of particle preforms for Si3N4(P)/Si3N4 radome composites prepared using chemical vapor infiltration process

作者：Liu Yongsheng; Cheng Laifei; Zhang Litong; Xu Yongdong; Liu Yi

来源：Journal of University of Science and Technology Beijing, 2008, 15(1): 62-66.

DOI：10.1016/S1005-8850(08)60013-4

• silicon nitride
• particle preform
• design
• microstructure
• chemical vapor infiltration (CVI)

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 cauliflower-shaped structure.

• 出版日期2008-2
• 单位西北工业大学