MgAl₂O₄–CaAl₁₂O₁₉ (MA-CA₆) composites were prepared using Al₂O₃, MgO and CaCO₃ powders as the raw materials by solid-state reaction sintering at 1200–1600 ℃. The effects of ZnO addition on the physical and mechanical properties, microstructure, and phase composition were investigated. ZnO additive can significantly increase the amount of MA due to the formation of the (Mg_1-xZn_x)Al₂O₄ solid solution, which greatly improves the densification and the flexural strength of the composites after sintering at 1600 ℃. Flexural strength reaches a maximum of 192.1 MPa and apparent porosity is 8.5% when 2 wt% of ZnO is added. This is resulted by the close bonding between MA and CA₆ grains. However, further increasing the ZnO content results in a slight decrease in the strength of the composites due to the weakening of the plate-like CA₆ bridging effect and the concentration of Zn²⁺ at the MA grain boundary.

以Al ₂ O ₃，MgO和CaCO ₃粉末为原料，在1200-1600℃下进行固态反应烧结，制备了MgAl ₂ O ₄ –CaAl ₁₂ O ₁₉（MA-CA ₆）复合材料。研究了ZnO添加对物理机械性能，微观结构和相组成的影响。ZnO添加剂会由于（Mg _1-x Zn _x）Al ₂ O ₄的形成而显着增加MA的含量固溶体，大大提高了1600℃烧结后复合材料的致密化和抗弯强度。当添加2wt％的ZnO时，弯曲强度最大达到192.1MPa，表观孔隙率为8.5％。这是由于MA和CA ₆晶粒之间的紧密结合所致。但是，由于板状CA _6的架桥作用的减弱和MA晶界处的Zn ²⁺的浓度的降低，进一步增加ZnO的含量会使复合材料的强度稍微降低。