A Review on Ceramic Matrix Composites and Environmental Barrier Coatings for Aero-Engine: Material Development and Failure Analysis

Abstract

Ceramic matrix composites with environmental barrier coatings (CMC/EBCs) are the most promising material solution for hot section components of aero-engines. It is necessary to access relevant information and knowledge of the physical properties of various CMC and EBCs, the characteristics of defects and damages, and relevant failure mechanisms. Then, effective failure prediction models can be established. Individually assessing the failure of CMC and EBCs is not a simple task. Models considering the synergetic effect of coating properties and substrate fibrous architecture are more reasonable and more challenging. This paper offers a review and a detailed description of the materials features, failure mechanism, and failure modeling for both CMC substrate and EBC coatings. The various methods for failure analyses and their pros and cons are discussed. General remarks on technical development for failure modeling are summarized subsequently.

Cyclic Ablation Properties of C/SiC-ZrC Composites

“…Ceramic matrix composites (CMCs) are widely regarded as the most promising thermal protection materials due to their excellent high-temperature resistance, oxidation resistance, and ablation resistance [5,6]. However, CMCs may undergo thermal ablation and damage structural integrity in high-temperature applications [7]. Exploring the ablation mechanism of CMCs at high temperatures is of great research significance for improving the lifespan and performance of the RDE.…”

Analytical Model of Deformation of a Functionally Graded Ceramic Coating under Local Load

“…Despite all the advantages of functional coatings, there is the problem of ensuring that they work in extreme operating conditions, for example, in conditions of high temperatures, with intense contact effects or the appearance of local loads [15,16]. The presence of clear interfaces between individual components of the material, which have different coefficients of thermal expansion or values of elastic moduli, can lead to the delamination of components or the appearance of cracks, which causes the destruction of the coating [17,18].…”

High-Temperature Solid Particle Erosion of Environmental and Thermal Barrier Coatings

“…As such, the use of CMCs can lead to increased thermal and propulsive efficiency [1,2]. However, for silicon carbide (SiC)-based CMCs, the protective silica (SiO 2 ) scale responsible for oxidation resistance at high temperature reacts with water vapor that is produced as a by-product of combustion and forms a volatile silicon hydroxide species [1][2][3][4][5][6][7][8][9][10]. The competing reactions of SiO 2 scale growth and SiO 2 volatilization result in surface recession and a loss of structural integrity.…”

“…The competing reactions of SiO 2 scale growth and SiO 2 volatilization result in surface recession and a loss of structural integrity. Consequently, environmental barrier coatings (EBCs) were developed to protect SiC-based CMC components from the combustion environment and are critical for the durability and long-life requirements of CMC components [1][2][3][4][5][6][7][8][9][10].…”