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Mechanical behavior of whisker reinforced ceramics
The interest in ceramics and ceramic composites has prompted research concerned with mechanisms to toughen them and to improve their elevated temperature mechanical performance. The beneficial effects of ceramic whiskers on fracture toughness are derived from the high strength of the reinforcing phases and from crack deflection at interfaces. As described earlier, bridging of a crack by these reinforcing phases increases the fracture toughness by the formation of a bridging zone behind the crack tip wherein the bridging ligaments impose a closure stress on the crack. Similar toughening effects due to crack bridging are observed in silicon nitride ceramics containing elongated grains and in ceramics containing plate-like grains or reinforcing phases. The question that remained is whether or not such reinforced ceramics would exhibit attractive mechanical properties at elevated temperatures. This paper will review results that indicate that whisker reinforcement, and similar reinforcing approaches, improves the mechanical performance of ceramics at elevated temperatures.
Mechanical behavior of whisker reinforced ceramics
The interest in ceramics and ceramic composites has prompted research concerned with mechanisms to toughen them and to improve their elevated temperature mechanical performance. The beneficial effects of ceramic whiskers on fracture toughness are derived from the high strength of the reinforcing phases and from crack deflection at interfaces. As described earlier, bridging of a crack by these reinforcing phases increases the fracture toughness by the formation of a bridging zone behind the crack tip wherein the bridging ligaments impose a closure stress on the crack. Similar toughening effects due to crack bridging are observed in silicon nitride ceramics containing elongated grains and in ceramics containing plate-like grains or reinforcing phases. The question that remained is whether or not such reinforced ceramics would exhibit attractive mechanical properties at elevated temperatures. This paper will review results that indicate that whisker reinforcement, and similar reinforcing approaches, improves the mechanical performance of ceramics at elevated temperatures.
Mechanical behavior of whisker reinforced ceramics
P. F. Becher (author) / H. T. Lin (author)
1990
12 pages
Report
No indication
English
Ceramics, Refractories, & Glass , Ceramics , Mechanical Properties , Additives , Amorphous State , Chemistry , Composite Materials , Creep , Deformation , Density , Electron Microscopy , Flexibility , Fracture Mechanics , Grain Boundaries , Grain Orientation , Grain Size , Materials Testing , Measuring Methods , Modifications , Optimization , Performance Testing , Reinforced Materials , Stability , Strength Functions , Temperature Effects , Uses , Very High Temperature , Whiskers , Meetings , EDB/360203 , EDB/360202
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