The invention relates in particular to a method of manufacturing a part made of composite material, comprising at least: - the formation of a fibrous preform impregnated with a suspension, the suspension comprising a liquid medium comprising an aluminum phosphate having an atomic ratio Al / P less than 1, and ceramic particles present in the liquid medium, and - the heat treatment of the impregnated fiber preform at a temperature between 350 ° C and 1050 ° C in order to form, in the porosity of the fiber preform , a matrix binding the fibers of the preform and comprising crystalline aluminum metaphosphate Al (PO3) 3.
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