Abstract
The fracture parameters of Si3N4 ceramics including short W-filaments or dispersed by MoSi2 particles have been studied by using a fracture mechanic model and radiographic technique. The change in ultrasonic velocity and acoustic attenuation through the Si3N4 ceramics with varying content of MoSi2 dispersions have been researched by means of ultrasonic technique. The subcritical crack growth in Si3N4 ceramics with inclusions of WC particles has majorly been investigated by double torsion testing method and simultaneous acoustic emission technique; each type of specimens includes a certain size of WC particles ranging from 30 up to about 90 micrometers. The WC particles locating along the crack path in matrix play the role in hindering crack propagation. This can further be confirmed by the fractography in which the zigzag crack path as a result of temporary arrest of crack propagation is demonstrated.
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