Silicon nitride fiber reinforced nitride ceramic-based composite material and preparation method thereof

The invention relates to a silicon nitride fiber reinforced nitride ceramic-based composite material and a preparation method thereof. The method comprises the following steps: removing an impregnating compound from a woven silicon nitride fabric, and drying to obtain a to-be-treated silicon nitride fabric; the preparation method comprises the following steps: mixing low-activity inorganic boron nitride powder and liquid borazine to obtain a complex-phase nitride ceramic precursor; immersing a silicon nitride fabric to be treated in the complex-phase nitride ceramic precursor, and carrying out vibration high-pressure immersion treatment and curing treatment to obtain a silicon nitride fiber composite material; oxygen is isolated, the silicon nitride fiber composite material is subjected to first high-temperature heat treatment and second high-temperature treatment, and the high-temperature-resistant wave-transparent ceramic-based composite material is obtained; the preparation method of the silicon nitride fi