Alumina fiber reinforced ceramic matrix composite material containing lanthanum phosphate interface layer and preparation method of alumina fiber reinforced ceramic matrix composite material

The invention relates to an alumina fiber reinforced ceramic matrix composite material containing a lanthanum phosphate interface layer and a preparation method of the alumina fiber reinforced ceramic matrix composite material. The method comprises the following steps: impregnating an impregnating compound removed alumina fiber three-dimensional fabric in a lanthanum phosphate precursor solution, and sintering at high temperature to obtain an alumina fiber three-dimensional fabric containing a lanthanum phosphate interface layer; preparing aluminum oxide slurry; dipping the alumina fiber three-dimensional fabric in alumina slurry in vacuum, and then uniformly gelling; carrying out high-temperature sintering on the alumina fiber reinforced alumina-based composite material blank to obtain a sintered rough blank; the sintered rough blank is subjected to vacuum impregnation with alumina sol; performing vacuum impregnation on the alumina fiber three-dimensional fabric impregnated with the alumina ...