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共沉淀MgO(10.4mol%)-ZrO2粉体中MgO的固溶度

荣天君; 黄校先; 郭景坤; 王士维   

  1. 中国科学院上海硅酸盐研究所 上海 200050
  • 收稿日期:2001-12-28 修回日期:2002-03-06 出版日期:2003-01-20 网络出版日期:2003-01-20

Solid-Solubility of MgO in the MgO (10.4mol%)-ZrO2 Powder Coprecipitated

RONG Tian-Jun; HUNAG Xiao-Xian; GUO Jing-Kun; WANG Shi-Wei   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2001-12-28 Revised:2002-03-06 Published:2003-01-20 Online:2003-01-20

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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.

关键词: 共沉淀, MgO-ZrO2粉体, MgO, 固溶度

Abstract: 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.

Key words: coprecipitation, MgO-ZrO2 powder, MgO, solid solubility

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