Abstract：On the basis of pressure less sintering, the effects of MgO-Y2O3, MgO-Y2O3-La2O3 additives and sintering process containing one-step and two-step non-isothermal sintering on the microstructure and properties of Al2O3 ceramics were studied. The results show that using non-isothermal sintering method can significantly refine the Al2O3 grains. When MgO-Y2O3 are used as sintering aids, the closed porosity of Al2O3 ceramics prepared by one-step sintering and two-step non-isothermal sintering method are 1.88% and 3.93%, respectively, and its corresponding Al2O3 grains are 0.42 μm and 0.38 μm, respectively. At the same time, when MgO-Y2O3-La2O3 are used as sintering additives, the closed porosity of ceramics prepared by one-step sintering method and two-step non-isothermal sintering method are 3.59% and 2.82%, respectively, and its corresponding Al2O3 grains are 0.40 μm and 0.42 μm, respectively. When MgO-Y2O3 and MgO-Y2O3-La2O3 are used as sintering aids, the Al2O3 ceramics prepared in a one-step sintering process have higher hardness, and they are (18.3±0.5) GPa and (18.2±0.6) GPa, respectively. In order to obtain the higher fracture toughness, it is necessary to use MgO-Y2O3 as a sintering aid to prepare Al2O3 ceramic by one-step sintering method, and the fracture toughness value can reach (4.6±0.3) MPa·m1/2.
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2021, Vol. 26 
