Effect of MgO doping on densification and grain growth behavior of Gd2Zr2O7 ceramics by microwave sintering process
Effect of MgO doping on densification and grain growth behavior of Gd2Zr2O7 ceramics by microwave sintering process
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DOI：
10.1007/s00339-019-2835-y
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Junjing Duan;Zhangyi Huang;Chen Shi;Yao Yang;Jianqi Qi;Yutong Zhang;Yanli Shi;Z. Tang;T. Lu
中科院分区：
文献类型：
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作者：
Junjing Duan;Zhangyi Huang;Chen Shi;Yao Yang;Jianqi Qi;Yutong Zhang;Yanli Shi;Z. Tang;T. Lu
本研究报道了微波烧结过程中MgO掺杂对锆酸钆（Gd2Zr2O7）致密化和晶粒生长的影响，并采用新型共沉淀辅助溶剂热法合成了用于成型和烧结的纳米晶Gd2Zr2O7和掺镁的Gd2Zr2O7原料粉。结果表明，在不同烧结温度（1200 °C、1250 °C和1300 °C）下，致密度的增加总是伴随着晶粒尺寸不同程度的长大。在1300 °C时，随着晶粒的迅速长大，相对密度沿着迅速增加。而在1200 °C和1250 °C烧结时，随着MgO含量的增加，晶粒尺寸缓慢增大，致密度显著提高。在MgO掺杂量为2at%、烧结温度为1250 °C的条件下，制备了致密度为95%、晶粒尺寸为106 nm的Gd2Zr2O7陶瓷。MgO是一种有效的烧结助剂，能显著促进Gd2Zr2O7陶瓷的致密化过程，并能进一步降低其致密化温度。
In our study, the effect of MgO doping on the densification and grain growth in gadolinium zirconate (Gd2Zr2O7) during microwave sintering was reported, and the nanocrystalline Gd2Zr2O7and Mg-doped Gd2Zr2O7raw powders used for shaping and sintering were synthesized by a novel co-precipitation assisted solvothermal method. The results indicate that the increase in density is always accompanied by grain size growth with different degrees at different sintering temperatures (1200 °C, 1250 °C, and 1300 °C). The relative density increased rapidly along with the prompt grain growth at 1300 °C. However, when sintered at 1200 °C and 1250 °C, the grain size increased slowly, while the density increased remarkably with the further addition of MgO. Gd2Zr2O7ceramics with high density (95%) and relatively small grain size (106 nm) were fabricated at a MgO-doping amount of 2 at % and sintering temperature at 1250 °C. MgO was proved as an effective sintering additive for Gd2Zr2O7which can significantly promote the densification process and also can furtherly reduce the densification temperature.