Effect of groove-like structures on residual stress and shear strength in C/SiC–C103 alloy joints

Abstract

The study integrates a groove-like structure (GLS) into C/SiC composites utilizing Ticusil® braze alloy, leading to decreased residual stress and fortified joint connections with the C103 alloy. The primary joining mechanisms involve the infiltration of molten alloy into the composite, leading to the formation of a continuous thin TiCu2 layer near the brazing seam and a TiC/Ti5Si3 layer at the metal–ceramic interface. The residual stresses in the joints and their concentration sites are determined using the finite element method. The effects of GLS configurations including width, depth, and spacing on microstructure, composition, and residual stress, as well as potential crack sites, are comprehensively evaluated and compared to experimental results. GLS behavior under loading conditions is also inferred, in part, by predicting stress paths via shear strength simulations. An optimal GLS configuration with 1 mm depth, width, and spacing is identified that yields a shear strength of 22.8 MPa, 99% of that of a C/SiC composite strength. © 2025 The American Ceramic Society.