A Method for Determination of Consumed Volume of Carbon Interface in Oxidation Environment of Ceramic Matrix Composites

Abstract

The invention discloses a method for determining ceramic matrix composite material oxidation environment carbon interface consumption area. The method specifically comprises the steps that total number of fiber of a material cross section is counted, the average thickness of the interface and the average diameter of the fiber are measured, number of matrix cracks, distance between the matrix cracks, and distances between the two end surfaces of a material and the adjacent cracks are obtained and sorted from small to large; the fiber on the cross section is divided into independent fiber, single-point contact fiber, two-point contact fiber and multi-point contact fiber, and the number of corresponding types of fiber is counted; the areas of outer carbon interfaces of all types of fiber, andcontained carbon quality fraction of the material are calculated; the interface consumption lengths of the material in different oxidation time are calculated; and the relationship of size of 1 / 2 ofthe distances between interface consumption lengths and the matrix cracks, and 1 / 2 of the distance between the two end surfaces of the material and the adjacent cracks is compared, the total length ofcarbon interface consumption is obtained, and finally the interface consumption area is obtained through calculation. According to the method for determining ceramic matrix composite material oxidation environment carbon interface consumption area, the carbon interface consumption area and distribution condition after the material is oxidized for a certain time can be accurately given.

Description

technical field [0001] The invention relates to a method for determining the consumed volume of a carbon interface in an oxidizing environment of a ceramic matrix composite material, in particular to a method for determining the consumed volume of a carbon interface in an oxidizing environment of a unidirectional silicon carbide fiber toughened silicon carbide ceramic based composite material. Background technique [0002] Silicon carbide fiber toughened silicon carbide ceramic matrix composites (Continuous silicon carbide fiber reinforced silicon carbide composites, hereinafter referred to as SiC / SiC) have excellent properties such as high temperature resistance, low density, high specific strength, and high specific modulus, making it a One of the irreplaceable new high-temperature structural materials, widely used in aerospace engine hot-end parts, aerospace back-and-forth heat protection systems, high-speed brakes, gas turbine hot-end parts, high-temperature gas filtratio...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for determining the consumed volume of the carbon interface in the oxidizing environment of the ceramic matrix composite material, which solves the problem that the prior art cannot accurately predict the interface of the unidirectional SiC / SiC composite material in the oxidizing environment Consumption volume distribution problem

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