氮化硅短纤维多孔材料制备与性能研究
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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

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Fabrication and Properties of Silicon Nitride Short Fibers Porous Materials
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1.Aerospace Research Institute of Materials & Processing Technology,Beijing 100076;2.Military Representative Office of Rocket Force in Capital Aerospace Machinery Company,Beijing 100076

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    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。

    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.

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宋雪峰,王树浩,李杨柱,张大海,周军.氮化硅短纤维多孔材料制备与性能研究[J].宇航材料工艺,2019,49(1):58-62.

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历史
  • 收稿日期:2018-08-07
  • 最后修改日期:2018-12-25
  • 录用日期:2018-11-06
  • 在线发布日期: 2019-02-18
  • 出版日期:
第十一届航天复合材料成形与加工工艺技术中心交流会 征文通知

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