Abstract: The present invention relates to a process for coating high-temperature-resistant fibrous materials with metal aluminates. The disclosed process includes immersing the starting fibrous material in a sol derived from at least two compounds: a compound of cerium or lanthanum and a compound of aluminum, to deposit a coating of metal aluminate on the fibrous material. The compounds of cerium, lanthanum and aluminum are selected from nitrates, acetates, oxalates and acetylacetonates. After the immersion, the fibrous material is removed from the sol after it is wetted, dried at temperatures of less than 400 degrees C. for at least 1 hour under pressure of less than or equal to 5 mbar and the fibrous material is introduced into a desired matrix at a temperature of more than 600 degrees C.