研究了等温热处理的共沉淀MgO(10.4mol％)-ZrO2粉体的酸浸滤,并利用XRD和TEM表征了粉体的物相和晶粒尺寸.结果表明:在1450℃,MgO全部溶入ZrO2晶格,相应的相是四方和立方相;在1350-750℃,只有约2.2mol％MgO溶入ZrO2晶格,相应的相为四方相;750℃以下,溶入ZrO2晶格的MgO反而增加,在500℃时,固溶度为7.7mol％MgO,相应的相是立方相.其余的MgO分布在ZrO2晶粒的表面.
MgO(10.4mol%)-ZrO2 powders coprecipitated were heated isothermally and quenched from 500 to 1450℃, then acid-leached and milled. Afterwards, the prepared powders were characterized by XRD and TEM technologies. The results show that all MgO(10.4mol%) is almost soluble in ZrO2 after isothermal heating at 1450℃ for 2h and quenching; at 750-1350℃, the solubility of MgO is about 2.2mol%; at 500℃, it is 7.7mol%. The rest of MgO exists on the surface of the ZrO2 crystallites.
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