SiC纤维增强RBSN高温吸波陶瓷基复合材料的研究

项目名称： SiC纤维增强RBSN高温吸波陶瓷基复合材料的研究

项目编号： No.51302235

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 唐学原

作者单位： 厦门大学

项目金额： 25万元

中文摘要： 吸波陶瓷基复合材料是国家急需的耐高温结构/功能一体化隐身材料。本项目采用碳化硅纤维预制体作为吸波剂和增强体，采用反应烧结的氮化硅（RBSN）作为透波和阻抗匹配基体，在基体中原位引入BN调节纤维和基体之间的界面性能，通过反应烧结法制备SiC/RBSN复合材料。初步测试表明，该复合材料具有优异的力学和介电性能，可用作耐高温吸波复合材料。材料的吸波性能取决于吸波剂的吸波性能（吸波特性）以及空气与材料界面之间的电磁波反射性能（阻抗匹配特性）。本研究将利用厦门大学自主研发的不同电阻率SiC纤维按照一定规律叠层，制成纤维预制体，然后与硅粉、硼粉制成复合材料坯体，最后通过高温氮化制成SiC/RBSN复合材料。主要解决以下科学问题：（1）SiC纤维预制体的设计对复合材料吸波性能的影响规律；（2）硼对复合材料基体氮化性能的影响规律；（3）硼对纤维和基体界面性能的影响规律，以及对复合材料断裂行为的影响规律。

中文关键词： SiC/RBSN复合材料；氮化硼；二氧化锆；介电性能；

英文摘要： Microwave absorbing ceramic-matrix composite is widely used in advanced weapons owing to their excellent combined structural and functional properties. In this project, the SiC preform is used as the reinforcement and microwave absorbing agent and the RBSN is used as the microwave transmitting and impedance matching matrix. The SiC/RBSN composite is fabricated by reactive sintering, using the in-situ formed BN to adjust the interface properties between the fibers and the matrix. The preliminary tests show that this composite has excellent mechanical and dielectric performance, suitable to be used as high temperature microwave absorbing composite. The microwave absorbing performance of a material depends on the two factors: the microwave absorbing ability and the microwave reflecting ability (impedance matching). In this project, SiC fibers with different resistivity are stacked in a certain order to form the SiC fiber preform, and then the SiC fiber preform is impregnated with Si and B powders slurry to produce the composite preform. Finally, the composite preform is nitridated to obtain the SiC/RBSN composite. The objectives of this project is to solve the following scientific problems: (1) the effect of the preform design on the microwave absorbing performance of the composite; (2) the effect of B on the n

英文关键词： SiC/RBSN composite；BN；ZrO2；dielectric performance；