Patent ID: 9302946
Filing Date: 2016-04-05
CPC Classification: C04B

Claim Text:
1. A process for producing a ceramic matrix composite part by injection of a suspension of a ceramic powder into a fibre reinforcement which has not been pre-impregnated, the method comprising: a) preparing a suspension of ceramic powder containing particles of chosen particle sizes dispersed in at least one solvent, in which the ceramic powder contains particles having a diameter which is from 5 to 10 times smaller than an average size of voids delimited by fibres of which the fibre reinforcement is composed, and in which the suspension has a loading rate of particles sufficient that only a single injection step is required to obtain a desired density of the ceramic matrix composite; b) positioning the fibre reinforcement in a mould; c) positioning on the fibre reinforcement a permeable membrane of chosen permeability that is permeable to gases and/or to liquids and impermeable to the particles, thus allowing a first cavity containing the fibre reinforcement to be closed; d) positioning an impermeable membrane, which forms a counter-mould, thus allowing a second, tight cavity which is next to the first cavity and contains the first cavity to be closed; e) establishing a vacuum between the impermeable membrane and the permeable membrane, in the second cavity, so as to create the vacuum in the first cavity; f) injecting, into said first cavity, beneath the permeable membrane, the suspension of ceramic powder of step a) into the fibre reinforcement, by means of a difference of pressure, the injection being carried out in a single injection step; g) removing the solvent through the permeable membrane in order to obtain an impregnated fiber reinforcement; h) removing the impregnated fiber reinforcement obtained in step g) from the mould; and i) sintering the impregnated fiber reinforcement obtained in step h).