Fabrication of High Performance 2.5D SiO_2f/Si₃N₄‐BN Composites for High‐temperature Application

A radar window for a re-entry vehicle should process critical mechanical properties. Fused silica, BN and Si3N4 ceramics are the three popular materials for such applications, but are limited in some fields for their intrinsic disadvantages. In the present study, 2.5 dimensional silica fiber reinforced Si3N4-BN matrix composites were prepared by a PIP method through repeated infiltration of hybrid precursor and pyrolysis at high temperature in ammonia atmosphere.