In-situ growth SiC nanowire reinforced SiC ceramic matrix composite material and preparation method thereof

Abstract

The invention relates to an in-situ growth SiC nanowire reinforced SiC ceramic matrix composite material. The in-situ growth SiC nanowire reinforced SiC ceramic matrix composite material consists of areinforced fiber, SiC nanowires, an interface layer and an SiC matrix, and is characterized in that the SiC nanowires are grown on the reinforced fiber in an in-situ manner; the surface of the reinforced fiber and the surfaces of the SiC nanowires are coated with the interface layer; the SiC matrix is filled in a gap surrounded by the reinforced fiber and the SiC nanowires; the reinforced fiber is C fiber or SiC fiber; the diameters of the SiC nanowires are 50 to 200 nm, and the lengths of the SiC nanowires are 0.5 to 3 mm; the interface layer is PyC or BN, and the thickness of the interfacelayer is 0.02 to 0.1 micron. The in-situ growth SiC nanowire reinforced SiC ceramic matrix composite material effectively solves the problem that the SiC nanowires are relatively difficult to distribute uniformly in a fiber perform, and in addition the advantage of the SiC nanowires for the SiC ceramic matrix composite material is sufficiently developed through the in-situ growth SiC nanowires.

Description

technical field [0001] The invention relates to a ceramic matrix composite material and a preparation method thereof, in particular to an in-situ growth SiC nanowire reinforced SiC ceramic matrix composite material and a preparation method thereof. Background technique [0002] SiC ceramic matrix composites have the characteristics of light structure, high specific strength and high ratio modulus, high temperature resistance, good thermal shock resistance, low thermal expansion coefficient, oxidation resistance and corrosion resistance, etc., and have been widely used in aero-engine hot section structural parts, Rocket engine nozzle, combustion chamber and other aerospace fields. As these high-end fields put forward higher requirements on material performance, for example, the engine requires materials to be more resistant to high temperature and withstand greater airflow, and the nozzle part requires materials to withstand greater pressure. Due to the large increase in ambi...

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Problems solved by technology

However, in this method, the fiber preform is directly immersed in the slurry prepared by mixing polycarbosilane, catalyst, and solvent, and then pyrolyzed to grow SiC nanowires in situ. Gas is generated due to the decomposition of polycarbosilane during the pyrolysis process, and Volume shrinkage occurs by itself, which will interfere with the growth of SiC nanowires, resulting in uneven growth and insufficient length to effectively strengthen the composite material