中文摘要：

以分析纯的Mg O、烧结尖晶石、活性α-Al2O3、电熔单斜氧化锆为原料,采用淬冷法研究了Y2O3和Ti O2对Mg4.68Al2.64Zr1.68O12合成的影响。结果表明：当温度为1 710℃,Mg4.68Al2.64Zr1.68O12的合成优先于Y2O3、Ti O2在Zr O2中的固溶,Zr O2固溶体须脱溶出Y2O3、Ti O2,才能参与Mg4.68Al2.64Zr1.68O12的反应,其稳定性与Mg4.68Al2.64Zr1.68O12的合成率呈反比。Y2O3质量分数小于1.0%时对Mg4.68Al2.64Zr1.68O12的合成影响不大,超过1.5%时不利于Mg4.68Al2.64Zr1.68O12的合成,但却有利于试样的致密化及Zr O2晶粒细化。Ti O2较Y2O3稳定Zr O2的效果差,其能同时促进Mg4.68Al2.64Zr1.68O12的合成及晶粒长大,其加入量以1.0%质量分数为佳。

英文摘要：

The effects of Y203 and TiO2 on the synthesis of Mg4.68Al2.64Zr1.68O12 prepared by a quenching method with analytically pure MgO, sintered spinel, active a-A1203 and fused m-ZrO2 as raw materials were investigated. The results show that the desolution of Y203 and TiO2 from ZrO2 at 1 710 ℃ occurs before the synthesis of Mg4.68Al2.64Zr1.68O12. The synthesis rate is inversely to the stability of ZrO2. Y2O3 of 〈 1.0% （in mass content） has little effect on the synthesis of Mg4.68Al2.64Zr1.68O12. When Y203 mass content is 〉1.5%, it is favorable to the densification and grain refinement of ZrO2 rather than the synthesis of Mg4.68Al2.64Zr1.68O12. Compared to Y2O3, the effect of TiO2 stabilizing ZrO2 is ineffective. TiO2 can promote the synthesis and grain growth of Mg4.68Al2.64Zr1.68O12, and the optimal mass fration of TiO2 is 1.0%.