Preparation of High-Performance 2D Si3N4f/SiBN Ceramic Matrix Composites by Precursor Infiltration Pyrolysis

Abstract

Abstract Continuous nitride fiber reinforced nitride matrix composite has been recognized as a promising microwave transparent radome material. The preparation of 2D silicon nitride fibers fabric reinforced silicon boronitride ceramic composites through polyborosilazane precursor infiltration pyrolysis routine is reported. The effects of thermal molding process on the properties and microstructure of theSi3N4f/SiBN composites were studied. The results show that the optimal molding pressure was 6 MPa due to the fine interfacial bonding between fiber and matrix. The Si3N4f/SiBN composites exhibits brittle fracture characteristic, the flexural strength and elastic modulus182.7 MPa and 51.1 GPa respectively, and the dielectric constant and dielectric loss are 4.12 and 8.82×10−3, respectively. The Si3N4f/SiBN composites get the best comprehensive performance.