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氮化硅短纤维多孔材料制备与性能研究
宋雪峰1, 王树浩2, 李杨柱2, 张大海1, 周军1
1.航天材料及工艺研究所,北京 100076;2.火箭军驻首都航天机械有限公司军事代表室,北京 100076
摘要:
以氮化硼为烧结助剂,采用抽滤成型方法制备氮化硅短纤维多孔材料。通过氮化硼和氮化硅纤维的氧化过程分析,确定了最佳烧结制度。对不同氮化硼含量材料的微观结构、压缩及介电性能进行了测试分析。结果表明:在1 200 ℃时,氮化硼氧化增重达20%,氮化硅纤维表面明显氧化;随着氮化硼含量的增加,氮化硅纤维粘结明显,粘结点主要成分为二氧化硅和硼硅酸盐,氮化硅短纤维多孔材料的ε随着密度的增加从1.36增加到1.62,tanδ从7.8×10-4增加到9.5×10-4,材料10%压缩应变下的压缩强度从0.58 MPa提升到2.03 MPa。
关键词:  多孔材料  氮化硅纤维  透波性能
DOI:10.12044/j.issn.1007-2330.2019.01.011
分类号:
基金项目:
Fabrication and Properties of Silicon Nitride Short Fibers Porous Materials
SONG Xuefeng1, WANG Shuhao2, LI Yangzhu2, ZHANG Dahai1, ZHOU Jun1
1.Aerospace Research Institute of Materials & Processing Technology,Beijing 100076;2.Military Representative Office of Rocket Force in Capital Aerospace Machinery Company,Beijing 100076
Abstract:
Silicon nitride short fibers porous materials were fabricated by using boron nitride as sintering assistant with extraction and filtration method.The optimum sintering system was determined by analyzing the oxidation process of boron nitride and silicon nitride fibers.The microstructure, dielectric properties and compressive properties of different boron nitride content materials were investigated and analyzed. The results show that the oxidation weight of boron nitride increases 20%,the oxidation is obvious on the surface of silicon nitride fiber at 1 200 ℃.Silicon nitride short fibers are adhesived markedly along with increasing of the content of the boron nitride,the test result show the main components of bonding points are silicon dioxide and borosilicate.And with the increase of the density, the dielectric constant of silicon nitride short fibers porous materials increases from 1.36 to 1.62,tanδ increases from 7.8×10-4 to 9.5×10-4,the compressive strength of materials under 10% compressive strain improves from 0.58 MPa to 2.03 MPa.
Key words:  Porous materials  Silicon nitride fibers  Wave-transparent property