High-density alumina fiber reinforced alumina ceramic-based composite material and low-temperature preparation method thereof

The invention provides a high-density prepared alumina fiber reinforced alumina ceramic-based composite material and a low-temperature preparation method thereof. The method comprises the following steps: pretreating an alumina fiber preform to remove glue; preparing a lanthanum phosphate interface solution, fully infiltrating the pretreated alumina fiber preform into the lanthanum phosphate interface solution for vacuum impregnation, taking out, standing, drying at a low temperature, presintering at a low temperature, and circulating for multiple times until an interface layer reaches a set thickness, so as to obtain a preform containing a lanthanum phosphate interface layer; preparing aluminum sol containing lithium fluoride, carrying out vacuum impregnation on the preform containing the lanthanum phosphate interface layer in the aluminum sol containing lithium fluoride, taking out, standing, drying at a low temperature, presintering at a low temperature, circulating for multiple times until the weight incr