2.10 – Toughness, Fatigue and Thermal Shock of Ceramics: Microstructural Effects

摘要: The aim of this chapter is to review the influence microstructure and microstructural toughening on fracture behavior, particularly during static or cyclic fatigue thermal shock. Attention focused representative materials like polycrystalline alumina (Al 2 O 3 ), silicon carbide, nitride (Si N 4 known exhibit R-curve behavior as a result grain-bridging mechanism, zirconia (ZrO )-based ceramics exhibiting phase transformation toughening. development specific microstructures leads flaw-tolerant with an improved crack resistance (R-curve). consequence crack-shielding mechanisms which decrease net tip driving force due closure tractions in wake. It has been shown that decreases susceptibility subcritical growth under loading, increases shock resistance. However, toughened are generally more susceptible degradation loading.