Erosion in a Melt-Infiltrated SiC/SiC Ceramic Matrix Composite

摘要

Erosion in CMCs is a complex, iterative process characterized by random microfracture of fibers and matrices by numerous impacting particles. This process is further convoluted due to the inherent complexity in the form of their unique architecture in addition to the presence of pores/defects. Based on the erosion assessments, the macroscopic target material properties such as nominal density, matrix hardness, and elastic modulus were found to be the most significant parameters affecting the erosion of SiC/ SiC CMCs. A phenomenological erosion model was developed for SiC/SiC CMCs by taking those material properties intoaccount in conjunction with particle kinetic energy. The model was in reasonable agreement with the experimental data. How-ever, a physics-based erosion model needs to be developed based on accurate governing erosion mechanisms. Interdisciplinary approaches in characterization, modeling, and CMC material/ component design with respect to erosion are also needed for overall enhanced reliability and durability of CMC engine hardware.