A novel approach to improve flexural strength of Al₂O₃‐20 wt% ZrO₂ composites by oscillatory pressure sintering

Abstract

In this communication, Al 2 O 3 -20 wt% ZrO 2 composites (ZTA) were prepared by a novel oscillatory pressure sintering (OPS) process. An almost perfectly full density of 99.94% and a relatively high flexural strength of 1145 MPa can be achieved for the OPS-fabricated specimen, which were higher than those prepared by pressureless sintering (98.24% and 682 MPa) and hot pressing (99.53% and 990 MPa). The enhancement of flexural strength of the OPS-fabricated specimen was correlated with its smaller flaw size and higher fracture surface energy. It was suggested that OPS was an effective approach to fabricate ZTA composites with ultrahigh density and high strength. K E Y W O R D S flexural strength, microstructure, oscillatory pressure sintering (OPS), ZTA ceramics

Performance analysis of Na-β″-Al2O3/YSZ solid electrolytes produced by conventional sintering and by vapor conversion of α-Al2O3/YSZ

“…Zirconia is often used both as a reinforcing aid for sintering and to enhance the mechanical properties of α-and Na-β''-Al2O3. [29] For the composites sintered with Na-β''-Al2O3, an almost linear increase in flexural strength is observed with increasing concentration of YSZ-3. The strength of the vapor phase converted composites are more than 100 MPa higher than the directly sintered Na-β''-Al2O3 ceramics with the same YSZ-3 concentration (Figure 10).…”

ZrO2 Matrix Toughened Ceramic Material‐Strength and Toughness

“…In addition, the particle reinforced phase is not easily affected by the working temperature, and thus it is a good toughening method for ceramics. [ 127 ]…”