Abstract:SiBN fiber-reinforced nitride ceramic matrix composite materials were prepared by the precursor polymer
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 lowcarbon
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.
