Method for predicting inner oxidation morphology of unidirectional ceramic matrix composite material in stress water vapor environment

Abstract

The invention discloses a method for predicting inner oxidation morphology of a unidirectional ceramic matrix composite material in a stress water vapor environment. The method comprises the following steps of determining a matrix crack number of the unidirectional ceramic matrix composite material; determining a crack width change rule; calculating a diffusion coefficient of water vapor in CO and H2 mixed gas; measuring a specific ratio of CO and H2 which are generated in actual oxidation reaction; and determining the inner oxidation morphology of the ceramic matrix composite material, namely calculating a water vapor concentration field, and determining the inner oxidation morphology of the ceramic matrix composite material at anytime. The method predicates the inner oxidation morphology of the ceramic matrix composite material in the stress water vapor environment and accurately acquires the inner crack wall oxidation of the material after stress oxidation, and oxidation morphology of fibers, an interface and a matrix after the water vapor enters the crack bottom, thereby supplying a theoretical support and an experiment basis for an oxidation problem of the unidirectional ceramic matrix composite material in the stress water oxygen coupling environment.

Description

technical field [0001] The invention relates to a method for predicting the oxidation morphology of a ceramic matrix composite material in a stress water vapor environment, in particular to a method for predicting the internal oxidation morphology of a unidirectional silicon carbide fiber toughened silicon carbide ceramic matrix composite material in a stress water vapor environment. Background technique [0002] Silicon carbide fiber reinforced silicon carbide ceramic matrix composites (Continuous silicon carbide fiber reinforced silicon carbide composites, referred to as SiC / SiC) has excellent properties such as high temperature resistance, low density, high specific strength, high specific modulus, etc. It has a wide application prospect on components such as nozzle adjustment pieces. [0003] Due to the good compatibility of pyrolytic carbon with silicon carbide fiber and matrix, it is widely used as an interface phase in SiC / SiC materials. SiC / C / SiC materials are curre...

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Problems solved by technology

[0009] The present invention aims at the deficiencies of the above-mentioned prior art, and provides a method for predicting the internal oxidation morphology of unidirectional ceramic matrix composites in a stress water vapor environment, so as to solve the problem in the prior art that the unidirectional ceramic matrix composites cannot be predicted under stress water. Problems with Internal Oxidation Morphology in Vapor Oxidation Environment

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