Toughening of a Particulate-Reinforced/Ceramic-Matrix Composite.

摘要

The toughening mechanism of particulate-reinforced/ceramic-matrix composites was attributed to the thermal residual stress field induced by the differential thermal expansions of the matrix and the particulate when the composite is cooled from the processing to room temperature. The measured increase 77 percent in toughness in a TiB2-particulate/SiC-matrix ceramic composite compared well with the predicted increase of 52 percent. Keywords: Toughening mechanism; Particulate-reinforced/ceramic-matrix composite; Thermal residual stress; Crack deflection model; Eshelby's model; Coefficient of thermal expansion. (SDW)