Strength Analysis and Stress-Strain Deformation Behavior of 3 mol% Y-TZP and 21 wt.% Al2O3-3 mol% Y-TZP

Abstract

The mechanical behavior of 3 mol% Y2O3-ZrO2 ceramic and 21 wt.% Al2O3-3 mol% Y2O3-ZrO2 ceramic composite with submicron grain size was studied. Mechanical properties, such as hardness, Young’s modulus, four-point bending strength, and fracture toughness of both materials were measured. Linear stress-strain deformation behavior of both 3 mol% Y2O3-ZrO2 and 21 wt.% Al2O3-3 mol% Y2O3-ZrO2 was observed in flexure, both at room temperature and at 400 °C. A small deviation from linear elastic deformation was detected in 21 wt.% Al2O3-3 mol% Y2O3-ZrO2 ceramic composite when loaded above a stress of 1500 MPa. Therefore, it was concluded that only elastic deformation occurred at low stresses upon loading, which exclude the presence of domain switching in zirconia upon bending under the loading conditions of this study.

Effects of Sintering Temperature and Yttria Content on Microstructure, Phase Balance, Fracture Surface Morphology, and Strength of Yttria-Stabilized Zirconia

“…Perfect properties of ZrO 2 -based ceramics (zirconia) such as high bending strength and fracture toughness, as well as their high chemical stability and biocompatibility [1,2], allow these ceramics to be widely used in the manufacturing of various high-temperature components and units [3][4][5][6][7], as well as in chemical industry [8][9][10], energy generation [11,12], and biomedical applications, in particular, for the manufacture of dental and other implants [13,14] and prostheses [15][16][17]. In dentistry, zirconia ceramics are used for the manufacture of frameworks for dental prostheses, monolithic restorations [18][19][20][21][22][23], as well as abutments for implants, inlay-and onlay-bridges, and single crowns [24].…”