Preparation method of continuous alumina fiber-reinforced aluminum oxide ceramic matrix composite material

Abstract

The invention belongs to a continuous alumina fiber-reinforced aluminum oxide ceramic matrix composite material preparation technology and relates to a preparation method of a continuous alumina fiber-reinforced aluminum oxide ceramic matrix composite material. Firstly, an oxide organic polymer precursor is adopted as a raw material, a porous oxide ceramic coating is prepared through PIP process to serve as a fiber and matrix interface in the composite material, then a freeze drying process of aluminum oxide ceramic slurry is utilized to obtain a porous aluminum oxide matrix green body framework provided with three-dimensional network through holes, the oxide organic polymer precursor is utilized to repeatedly dip the porous aluminum oxide matrix green body framework to obtain a dense matrix green body, and finally the composite material green body is sintered to obtain the high-performance composite material. The freeze drying process is adopted in the matrix compactness process so that the high compactness matrix can be obtained, it can be also ensured that the interlayer layer does not crack before high-temperature heat treatment, obtaining of the porous oxide coating is ensured, so that a weak interface is formed between the fiber and the matrix of the composite material, and a toughness improving effect of the composite material is achieved.

Description

technical field [0001] The invention belongs to the preparation technology of continuous fiber reinforced ceramic matrix composite material, and relates to a preparation method of continuous alumina fiber reinforced alumina ceramic matrix composite material. Background technique [0002] Continuous fiber-reinforced composite materials have the characteristics of low density, high specific strength, high specific modulus, high temperature resistance, oxidation resistance, and good reliability. They are the development direction of high-performance aero-engine materials. Among them, ceramic matrix composite (CMC) is a kind of high temperature (1650 ℃) and low density (2.5g / cm 3 ~3.3g / cm 3 ), which is expected to replace the density greater than 8.0g / cm 3 High-quality nickel-based or single-crystal nickel alloys are used as engine combustion chambers, flame stabilizers, inner cones, tail nozzles, worm wheel outer rings, high-pressure turbines, low-pressure turbines and other ...

AI Technical Summary

Problems solved by technology

Among the above three interface designs, among them, the process of depositing C and BN interface is relatively mature, but it is more suitable for non-oxide composite materials, because C and BN themselves are not anti-oxidation, and the interface of oxide composite materials will not allow composite materials. The material has been used for a long time in an oxidizing environment, which violates the original intention of preparing the oxide composite material; and for the interface design of preparing the matrix into a porous structure, although the structure of the porous matrix is ​​conducive to the improvement of the damage tolerance of the composite material, its external load The transmission will be significantly reduced, resulting in a decrease in the strength of the composite material

At the same time, when the porous matrix composite material is used in harsh working conditions such as gas, the water vapor and other water and oxygen environments in the gas will interact with the fiber through the porous matrix to accelerate the creep of the fiber, and the matrix material cannot provide proper protection for the composite material. For the third interface design using escaped carbon, in the process of composite material preparation, due to the existence of C interface, in order to protect C from oxidation, the densification process of the matrix can only be performed in non-oxygen It is carried out in an atmosphere, which greatly increases the complexity of the preparation and increases the cost