Preparation and properties of unidirectional boron nitride fibre reinforced boron nitride matrix composites via precursor infiltration and pyrolysis route

► BN fibres degrade little when exposed at elevated temperatures. ► Precursor infiltration and pyrolysis route is useful to prepare BNf/BN composites. ► Few reports have related to the preparation and properties of BNf/BN composites. ► BNf/BN composites have desirable high-temperature mechanical properties. ► BNf/BN composites have excellent dielectric properties at 2-18 GHz.