Brittle Fracture and Thermal Shock Resistance of Mechanical Ceramics

Authors: J. C. Glandus, 1981

Original Language: French (see French version)

Abstract

The present work is a contribution to a quantitative interpretation of thermal shock of ceramics to cold water. Materials used for the study are: Alumina Al23, Silicon nitride NR115, vitreous silica Pursil K, silicon oxynitride, sintered aluminium nitride and also silicon carbide and zirconium oxide. Elastic moduli are measured at medium frequency and an original method by disk vibrations is developed. Fracture toughness is examined and values obtained by different methods are discussed. Thermal shock is examined and a nondestructive method is presented. Influence of microstructural parameters and of temperature on mechanical properties are studied and consequences on resistance to thermal shocks are drawn. Importance of elaboration conditions on mechanical properties are underlined