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中文摘要：
以CaO-MgO-SiO2玻璃为烧结助剂,用液相烧结法制备了氧化铝和3%氧化钇稳定四方氧化锆复相材料.研究了烧结助剂对材料致密化、显微结构及力学性能的影响.结果表明：由于CaO-MgO-SiO2玻璃具有较小的液相粘度,因而对材料的致密化有较大促进作用,可使材料在1 500℃获得致密.烧成温度和材料组成均对Al2O3和ZrO2的平均晶粒尺寸产生影响.显微结构中少量的Al2O3和ZrO2晶粒为晶内分布.引入烧结助剂降低了材料的烧结温度,使材料具有细晶结构,因而具有良好的力学性能,在最佳条件下,样品的抗弯强度可达到778 MPa.
英文摘要：
Composites of Al2O3 and 3% （in mole） yttria-stabilized tetragonal zirconia polycrystals （3Y - TZP） were prepared by liquid phase sintering with the addition of CaO - MgO - SiO2 glass as sintering additive. The effects of the sintering additive on the densification, microstructure and mechanical properties of the composites were investigated. The results indicate that the densification is greatly improved by the addition of CaO - MgO - SiO2 glass because of its lower liquid viscosity. The composites can be densified at 1 500 ℃. The average grain sizes for Al2O3 and ZrO2 are associated with the sintering temperature and the composite composition. Some grains of Al2O3 and ZrO2 in the microstructure are intragranular. The sintering temperature is reduced after the introduction of CaO - MgO - SiO2 glass, and this gives the composites a fine grain structure and excellent mechanical properties. Bending strength of 778 MPa is obtained under the optimal preparation conditions.
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