Fabrication of ZrO2 whisker modified ZrO2 ceramics by oscillatory pressure sintering

摘要: Abstract Zirconia ceramics were prepared by oscillatory pressure sintering (OPS) with zirconia whisker as the reinforcement. The effects of fraction on microstructure, densification and mechanical properties investigated. By applying an ranging from 25 to 35 MPa powder mixtures, relative density OPS reached approximately 99.7% at 15 wt%. Because accelerated grain boundary sliding diffusional creep, average size was 0.9 μm, which much finer than that pressure-less sintered (1.5 μm). peak values flexural strength fracture toughness corresponded 1376 MPa 6.7 MPa m1/2, respectively. Whisker bridging, crack deflections considered primary toughening mechanisms. This study provides approach prepare uniform, fine grains excellent toughness.