ROLE OF THE GRAIN-BOUNDARY PHASE ON THE ELEVATED-TEMPERATURE STRENGTH, TOUGHNESS, FATIGUE AND CREEP RESISTANCE OF SILICON CARBIDE SINTERED WITH Al, B AND C

摘要

The high-temperature mechanical properties, specifically strength, fracture toughness, cyclic fatigue-crack growth and creep behavior, of an in situ toughened silicon carbide, with Al, B and C sintering additives(ABC-SiC), have been examined at temperature from ambient to 1500 deg. C with the objective of resistance and particularly the fracture toughness displayed by ABC-SiC at ambient temperatures was not severely compromised at elevated temperatures; indeed, the fatigue-crack growth properties up to 1300 deg. C were essentially identical to those at 25 deg. C, whereas resistance to creep deformation was superior to published results on silicon nitride ceramics.