Fracture Mechanism Maps for Advanced Structural Ceramics. Part 1. Methodology and Hot-Pressed Silicon Nitride Results.

摘要

The static fatigue behavior of advanced structural ceramics can be controlled by a variety of failure mechanisms. A fracture mechanism map can define the stress-temperature regimes where the different mechanisms are dominant. The static fatigue resistance of a hot-pressed silicon nitride with magnesia sintering aid is limited by slow crack growth or creep fracture, depending upon the specific stress-temperature conditions. The flexural fracture map is considerably refined relative to earlier versions, and in conjunction with available tension data, was used to create a tension fracture map. The fracture map brings together the findings of a number of studies and can be appreciated by materials scientists and engineers. Ceramics, Silicon nitride, Powders, Hot pressing, Fracture mechanics, Fracture maps, Stress rupture, Creep rupture, Hot-Pressed Silicon Nitride(HPSN). (jg)