碳纤维增强SiBCN陶瓷基复合材料的制备及性能

摘要

Carbon fiber reinforced SiBCN-matrix composites were fabricated by polymer infiltration and pyrolysis route (PIP) with a lab-produced SiBCN precursor (P-SiBCN) as a matrix source.Their mechanical properties were investigated.The composite obtained from 8 PIP-cycles showed its flexure strengths of 334 MPa at room temperature,and in-situ flexure strength of 367 MPa at 800℃ in inert gas atmosphere.The composite retained its 60％ strengths upon bending even at 800℃ in air.%以自制的聚硼硅氮烷(P-SiBCN)为基体聚合物利用前驱体浸渍裂解技术(PIP)制备了二维碳纤维增强SiBCN陶瓷基复合材料,并对其力学性能进行了初步研究.经8次浸渍-裂解,所得复合材料室温弯曲强度为334 MPa,800℃/氩气条件下弯曲强度367 MPa.该复合材料未经抗氧化防护处理情况下,800℃静态空气中氧化3h后,强度保留率约为60％.