Preparation of near fully dense (LaO1.5)x(ErO1.5)x(YO1.5)0.03-0.5x(ZrO2)0.97-x ceramics with restricted grain growth and high surface residual stress by hot pressing sintering at 950 °C

(LaO 1.5 ) x (ErO 1.5 ) x (YO 1.5 ) 0.03 - 0.5 x (ZrO 2 ) 0.97- x ceramics with high density (98.1 %), high strength (1533 MPa), high surface residual stress (1305 MPa) and fine grain (96 nm) were prepared by ultra-low temperature hot pressing sintering. The results indicate that high pressure significantly promotes densification in the contact area of (LaO 1.5 ) x (ErO 1.5 ) x (YO 1.5 ) 0.03 - 0.5 x (ZrO 2 ) 0.97- x ceramics particles and no effect on grain growth. Low temperature can effectively reduce the transition from tetragonal to cubic phase (T-C) and limit grain growth. In addition, 1305 MPa compressive stress on the surface of (LaO 1.5 ) x (ErO 1.5 ) x (YO 1.5 ) 0.03 - 0.5 x (ZrO 2 ) 0.97- x ceramics were the main reason for the improvement of bending strength . This process provides a design idea for obtaining fine-grained fully dense structural ceramics .