MICROSTRUCTURE-PROPERTY RELATIONSHIPS OF SiC FIBRE-REINFORCED MAGNESIUM ALUMINOSILICATES--II. MECHANICAL PROPERTIES AND FAILURE CHARACTERISTICS

摘要

Interfacial frictional shear stresses, flexural properties and failure mechanisms are reported for two magnesium aluminosilicates unidirectionally reinforced with Nicalon SiC fibres. Composites A and B were hot-pressed at 1500 and 920℃, respectively. High values of interfacial frictional shear stresses inferred from Marshall's analysis of the micro-indentation technique could be attributed in part to the presence of compressive radial stresses at the fibre-matrix interfaces. Although both composites failed non-catastrophically in symmetrical four point bend testing at room temperature, the failure modes were different.