共沉淀MgO(10.4mol%)-ZrO_2粉体中MgO的固溶度  

Solid-Solubility of MgO in the MgO (10.4mol%)-ZrO_2 Powder Coprecipitated

作　　者：荣天君[1] 黄校先[1] 郭景坤[1] 王士维[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2003年第1期238-242,共5页Journal of Inorganic Materials

基　　金：国家973项目(G2000067200-2)

摘　　要：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 1450degreesC, 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 1450degreesC for 2h and quenching; at 750similar to1350degreesC, the solubility of MgO is about 2.2mol%; at 500degreesC, it is 7.7mol%. The rest of MgO exists on the surface of the ZrO2 crystallites.

关 键 词：共沉淀 MgO-ZrO2粉体 MGO 固溶度 氧化镁 氧化锆 陶瓷 

分 类 号：TQ174.758[化学工程—陶瓷工业]