Mechanical Properties of ZrO_2-LaMgAl_(11)O_(19) Ceramics

摘要

ZrO_2 ceramics have been widely used in many fields with its excellent physical and chemical properties, but the mechanical properties of YSZ ceramics, especially the fracture toughness, decline caused by the failure of the phase transformation toughening at high temperature. In this investigation, plate-like LaMgAl_(11)O_(19) toughened ZrO_2 ceramics were prepared by pressureless sintering at 1550 °C for 3 h in air . The bulk density of the sintered samples are between 5.5 to 6.0 g/cm~3, and the relative density are above 93%. The mechanical properties of the ZrO_2-LaMgAl_(11)O_(19) ceramics were studied systematically at room temperature. The flexure strength and fracture toughness of ZrO_2-LaMgAl_(11)O_(19) ceramic are 811.8 MPa and 13.9 MPa·m~(1/2) with the LMA addition of 2 wt%.