Abstract

An important aspect for mechanical properties in ceramic composites is to evaluate the effect of whiskers/matrix interface characteristics, This work presents a microstructural analysis of whiskers/matrix interface of silicon nitride-based ceramic composites, reinforced with silicon carbide whiskers. A high-resolution transmission electrón microscope (HRTEM) has been used for such an evaluation. showing mainly the presence of the glassy phase at the whiskers/matrix interface and boundaries / triple junction of matrix grains. The predominant whiskers/matrix vitreous interface indícales weak interaction between whiskers and the surrounding matrix, which can actívate crack deflection and crack bridging toughening mechanisms. causing a significant increase in fracture toughness in ceramics composites.