纤维增强SiBN陶瓷基复合材料的制备及性能

Preparation and Performance of Fiber Reinforced SiBN Ceramic Matrix Composite

为了满足不同马赫数飞行器对透波材料提出的集透波、承载、防热、耐蚀、抗冲击于一体的性能要求,本文开展了不同耐热区间纤维增强陶瓷基复合材料的研究。采用PIP工艺分别制备了氧化铝、莫来石、石英、氮化硅纤维增强SiBN陶瓷基复合材料,并对其介电和力学性能进行了测试与评价。结果发现莫来石纤维增强SiBN陶瓷基复合材料的介电常数和介电损耗分别为4.1~4.2和1.0×10^-2~9.7×10^-3,抗弯、拉伸、压缩强度分别为95.12、34.95和80.92 MPa,具有最佳的综合性能。

Aimed at the comprehensive performance of wave-transparent materials applied in aircrafts at different Mach number,integrating the performance of wave transmissivity,load bearing,thermal insulation,corrosion resistance,shock resistance,research of ceramic matrix composites reinforced by continuous fibers of different temperature range were carried on. The Al_2O_3 fiber,mullite fiber,SiO_2 fiber,Si_3N_4 fiber-reinforced SiBN ceramic matrix composites have been fabricated by the way of precursor infiltration pyrolysis（ PIP） respectively. Subsequently,the dielectric and mechanical properties of the composites have been measured and evaluated. The mullitef-SiBN composite＇s dielectric constant and dielectric loss are 4. 1 to 4. 2 and 1. 0 × 10^（-2） to 9. 7 × 10^（-3） respectively. The composite＇s bending strength,tensile strength and compressive strength are 95. 12 MPa,34. 95 MPa and 80. 92 MPa respectively. The results prove that the mullitef-SiBN composite get the best comprehensive performance.