High-temperature-resistant ceramic-based composite member and connecting method thereof

Abstract

The invention relates to a high-temperature-resistant ceramic-based composite member and a connecting method thereof. The method comprises the following steps: (1) uniformly mixing silicon powder, chopped carbon fibers, an organic dispersing agent and a phenolic resin to obtain mixed slurry; (2) coating a joint face of a first to-be-connected prefabricated member and / or a second to-be-connected prefabricated member with the mixed slurry, and laminating and connecting the joint face of the first to-be-connected prefabricated member and the second to-be-connected prefabricated member so as to obtain a pre-connecting piece, wherein the first to-be-connected prefabricated member and / or the second to-be-connected prefabricated member are / is made from fiber preforms; (3) at least impregnating the joint of the pre-connecting piece with the mixed slurry, and sequentially curing and splitting the impregnated pre-connecting piece so as to obtain a pre-connected member; and (4) carrying out a silicon-zirconium alloy infiltration reaction on the pre-connected member, thereby obtaining the high-temperature-resistant ceramic-based composite member. The method disclosed by the invention has the advantages of being simple in process, capable of obviously enhancing the member connection strength and enabling the overall member to be high-temperature-resistant, and the like.

Description

technical field [0001] The invention belongs to the technical field of ceramic matrix composite materials, and in particular relates to a high-temperature-resistant ceramic matrix composite material component and a connection method thereof. Background technique [0002] With the development of aerospace technology and the development needs of future aircraft, lightweight, high-strength fiber-reinforced high-temperature structural composite materials have increasingly become key structural materials supporting the development of hypersonic aircraft and engines. For example, continuous carbon fiber toughened silicon carbide ceramic matrix composite (C / SiC ceramic matrix composite) is an ideal high-temperature structural material, which has a series of advantages such as high temperature resistance, low density, high strength, and thermal shock resistance. It is a thermal protection material developed earlier, with lower cost and more mature technology. In the practical appli...

AI Technical Summary

Problems solved by technology

Chinese patent application 201611182773.1 discloses a SiC ceramic matrix composite component and its preparation method. Although the preparation method improves the connection strength of the joint of the component compared with the traditional C / SiC composite component preparation method, the connection Because the connection strength is still low, the method is only suitable for the connection of carbon fiber reinforced carbon ceramic matrix composites (C / C ceramic matrix composites), C / SiC ceramic matrix composites, etc.

The existing connection methods are suitable for ceramic matrix composites such as C / C and C / SiC, but in the ultra-high temperature environment, the existing connection methods are likely to cause the failure of the connection position; and the current modified ultra-high temperature ceramic matrix composites The special conditions of the joints are not taken into account in the preparation methods, and the joints and the integral components are connected by the same connection method without strengthening the joints, which will easily cause the joints to be damaged under ultra-high temperature conditions. Invalid use