METHOD FOR PRODUCING PART FROM COMPOSITE MATERIAL Russian patent published in 2022 - IPC C04B35/571 C04B35/532 C04B35/80 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to production of a part from a composite material, which can be a part of a hot section of a gas turbine of an aircraft or aerospace engine, or an industrial turbine, or a part of a turbine engine. Method includes at least the following stages. 1) Introduction of an adhesion promoter into the pores of the fibrous preform formed from refractory fibers with a coating having OH groups on its surface. Adhesion promoter comprises an electron-acceptor group G1, which is reactive with respect to a substitution reaction or nucleophilic addition to OH groups, and a reactive group G2, selected from: a hydroxyl group, an epoxide, a halogen atom, an amino group, a carbonyl group, a carbon-carbon double bond or a carbon-carbon triple bond. 2) Grafting of the adhesion promoter to the coating surface by means of a substitution reaction or nucleophilic addition of the G1 group to OH groups, wherein grafting is carried out by first heating the fibrous preform into which an adhesion promoter has been introduced. 3) Introduction of the ceramic precursor resin into the pores of the fibrous preform after the adhesion promoter grafting step. 4) Polymerisation of the introduced resin and binding of the graft adhesion promoter to the resin by means of a chemical reaction between these two compounds at the level of the G2 group. Said polymerisation and said binding are carried out by means of the second heating of the fibrous preform, into which the resin has been introduced. 5) Formation of the ceramic matrix phase in the pores of the fibrous preform by pyrolysis of the polymerised resin.

EFFECT: technical result of the invention is an increase in the mechanical strength of the part due to improved adhesion between the matrix phase and the fibrous preform.

10 cl, 13 dwg, 2 ex