Preparation of ZrP2O7-based fiber composites by in situ synthesis method

ZrP 2 O 7 -based fiber composites were prepared by in situ synthesis and their microstructure, thermal conductivity, mechanical and dielectric properties were determined. The chemical reaction with BPO 4 as the phosphorus source and nano-ZrO 2 as the zirconium source was initiated at 900°C, which promotes liquid-phase sintering and reduces the sintering densification temperature of the ZrP 2 O 7 -based fiber composites by generating small ZrP 2 O 7 grains and low-melting B 2 O 3 . The lower sintering densification temperature and the appropriate amount of network formers effectively suppressed the high-temperature crystallization phenomenon of the high-silica-oxygen fibers, strengthened the interfacial bonding between the fibers and the matrix, and improved the interfacial debonding problem of the ZrP 2 O 7 -based fiber composites. It is found that the ZrP 2 O 7 -based fiber composites possess low dielectric constant, low dielectric loss, good thermal conductivity, and acceptable mechanical properties, which can meet the relevant application requirements of centimeter-wave technology.