A Method for Predicting Internal Oxidation Morphology of Unidirectional Ceramic Matrix Composites under Stressed Water Vapor Environment

Abstract

The invention discloses a method for predicting the internal oxidation morphology of a unidirectional ceramic matrix composite material in a stress water vapor environment, comprising the following steps: determining the number of cracks in the matrix of the unidirectional ceramic matrix composite material; and H 2 Diffusion coefficient in gas mixture; measured for CO and H formation in actual oxidation reactions 2 The specific ratio; determine the internal oxidation morphology of the ceramic matrix composite material: obtain the water vapor concentration field, and determine the internal oxidation morphology of the ceramic matrix composite material at any time. The invention predicts the internal oxidation morphology of the ceramic matrix composite material under the stress water vapor environment, and accurately obtains the oxidation of the internal crack wall of the material after the stress oxidation, and the oxidation morphology of the fiber, interface and matrix after the water vapor enters the bottom of the crack. The appearance provides theoretical support and experimental basis for calculating the oxidation of unidirectional ceramic matrix composites in a 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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