Preparation method of alumina fiber reinforced ceramic matrix composite material containing alumina interface layer

Abstract

The invention discloses a preparation method of an alumina fiber reinforced ceramic matrix composite material containing an alumina interface layer, and relates to the technical field of alumina fiber reinforced ceramic composite materials. An acid hydrolysis method is used to prepare alumina sol, and the alumina fiber is pretreated to remove After the impregnating agent, the impregnated alumina sol is wound onto the mandrel for molding, followed by repeated impregnation of the oxide sol and drying-heat treatment to obtain a composite material. The method omits the weaving forming process of the fiber prefabricated body, adopts the winding forming method, and prepares the alumina fiber reinforced ceramic matrix composite material in one step, thereby reducing the waste of broken yarn in the weaving process of the fiber. An alumina interface layer is formed between the alumina fiber and the oxide matrix, which effectively reduces the bonding strength between the fiber and the matrix, exerts the toughening and strengthening effect of the fiber, and improves the mechanical properties of the composite material. The preparation method provided by the invention has the advantages of simplicity, low cost, no pollution and the like.

Description

technical field [0001] The invention relates to the technical field of alumina fiber-reinforced ceramic composite materials, in particular to a preparation method of alumina fiber-reinforced ceramic-based composite materials containing an alumina interface layer. Background technique [0002] The continuous alumina fiber reinforced oxide ceramic matrix composite material has high temperature resistance, oxidation resistance, good mechanical strength and heat insulation performance, and can be used for a long time at 1200 ° C. This material can replace the poor strength and toughness under high temperature oxidative conditions. Metal materials and non-oxide-based ceramic composite materials meet the application requirements of a new generation of aerospace vehicles and aero-engines, and have broad application prospects in aviation, aerospace, nuclear energy and other fields. Fiber-reinforced oxide composites tend to have a strong bond between the fiber and the matrix under hi...

AI Technical Summary

Problems solved by technology

This method needs to weave continuous alumina fibers into three-dimensional fabrics in advance. Because alumina fibers are brittle and easy to break, the weaving process will cause great damage to the fibers, the utilization rate of alumina fibers is low, and the subsequent densification process of composite materials is complicated, resulting in It is expensive to prepare

In addition, due to the steric hindrance effect of the fiber, it is difficult for the alumina sol to penetrate into the interior of the fabric, resulting in poor uniformity of the interface layer on the surface of the fabric, thereby affecting the mechanical properties of the composite material.

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