PIP法制备SiBN纤维增强氮化物陶瓷基复合材料Ⅰ——纤维和先驱体性能分析

Continuous SiBN Fiber Reinforced Nitride Ceramic Matrix Composites Fabricated by PIP I-Performance Analysis of Precursor and Fibers

利用先驱体聚合物浸渍-裂解(PIP)技术制备SiBN纤维增强氮化物陶瓷基复合材料,对SiBN纤维、聚硅硼氮烷有机先驱体裂解以及SiBN纤维增强氮化物陶瓷基复合材料性能进行了分析。研究表明:聚硅硼氮烷先驱体在氨气气氛下裂解得到的陶瓷产物碳含量较低,其裂解产物介电常数在3.0左右,介电损耗小于0.01;SiBN纤维中C和O元素含量均较高,碳的存在对材料介电性能影响明显;制备的氮化物陶瓷基复合材料弯曲强度为88.52 MPa,弹性模量为20.03 GPa。

SiBN fiber-reinforced nitride ceramic matrix composite materials were prepared by the precursor poly- mer infiltration/pyrolysis （PIP） technology, and the performances of SiBN fibers, polyborosilazane organic precursors and SiBN fiber-reinforced ceramic matrix nitride composites were investigated. Experimental results indicated that low- carbon ceramics are prepared by SiBN precursor pyrolysis under ammonia atmosphere. Dielectric constant of pyrolysis products is about 3.2, and the dielectric loss is less than 0.01. The content of C and O elements in SiBN fiber are high, and the presence of carbon element had notable impact on the dielectric properties. The flexural strength and modulus of prepared nitride ceramic matrix composites are 88.52 MPa and 20.03 GPa, respectively.