Resistance to erosion is one of the most desirable characteristics of materials that must undergo a tribological interaction, where engineering ceramics play an important role given their intrinsically enhanced mechanical properties. The fracture toughness and hardness of Al2O3 (alumina), ZrO2 (zirconia) and Si3N4 (silicon nitride) were compared with their erosion rate when subjected to solid particle jet wear from different incidence angles (30°, 60° and 90°) at room and elevated temperatures (25 °C and 850 °C), aiming to compare the results with the analytical Wiederhorn and Evans equations. Erosion rates are directly related to fracture toughness, but not with hardness. Scanning electron microscopy allowed to identify particular fracture mechanisms of each material at each temperature, especially for ZrO2 given its temperature-induced polymorphism confirmed by X-ray diffraction tests.
Dauber C., Vannucchi de Camargo F., Alves A.K., Pavlovic A., Fragassa C., Bergmann C.P. (2019). Erosion resistance of engineering ceramics and comparative assessment through Wiederhorn and Evans equations. WEAR, 432-433, 1-13 [10.1016/j.wear.2019.202938].
Erosion resistance of engineering ceramics and comparative assessment through Wiederhorn and Evans equations
Vannucchi de Camargo F.;Pavlovic A.;Fragassa C.;
2019
Abstract
Resistance to erosion is one of the most desirable characteristics of materials that must undergo a tribological interaction, where engineering ceramics play an important role given their intrinsically enhanced mechanical properties. The fracture toughness and hardness of Al2O3 (alumina), ZrO2 (zirconia) and Si3N4 (silicon nitride) were compared with their erosion rate when subjected to solid particle jet wear from different incidence angles (30°, 60° and 90°) at room and elevated temperatures (25 °C and 850 °C), aiming to compare the results with the analytical Wiederhorn and Evans equations. Erosion rates are directly related to fracture toughness, but not with hardness. Scanning electron microscopy allowed to identify particular fracture mechanisms of each material at each temperature, especially for ZrO2 given its temperature-induced polymorphism confirmed by X-ray diffraction tests.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
