CaZrO3的合成及其高温化学稳定性研究  

Synthesis and high temperature chemical stability of CaZrO3

作　　者：张广宇 王榕林 刘一帆 姬莹莹 刘会 Zhang Guangyu;Wang Ronglin;Liu Yifan;Ji Yingying;Liu Hui(Key Laboratory of Inorganic Nonmetallic Materials of Hebei Province,College of Material Science and Engineering,North China University of Science and Technology,Tangshan 063210,Hebei,China)

机构地区：[1]华北理工大学材料科学与工程学院河北省无机非金属材料重点实验室

出　　处：《耐火材料》2019年第4期288-293,共6页Refractories

基　　金：河北省钢铁联合基金资助项目(E2014209273)

摘　　要：首先以CaO粉、CaCO3粉、Ca(OH) 2粉为钙源,以纳米级m-ZrO2粉、微米级m-ZrO2粉、微米级CaO部分稳定ZrO2粉(Ca - PSZ)为锆源,采用高温固相反应法合成了CaZrO3粉,研究CaZrO3合成过程中试样的相组成随煅烧温度(800、900、1 000、1 100、1 200、1 300、1 400、 1 500 和1 600 ℃)与保温时间(3、4和5 h)的变化,以探讨其合成机制;然后将合成的CaZrO3分别与CaO、MgO、Al2O3、Cr 2O3、SiO 2、ZrO2粉制成试样在1 500 ℃保温 3 h 煅烧,以研究CaZrO 3在不同反应介质中的高温化学稳定性。结果表明:在CaZrO 3合成过程中,CaZrO 3含量并非始终随煅烧温度升高或保温时间延长而增加,期间存在源于CaZrO 3中的Ca^2+、O^2-离子向m-ZrO2或 c-ZrO2 中扩散而发生的CaZrO3分解反应。高温下,当CaZrO 3处于碱性(如CaO、MgO)环境中,其高温化学性质稳定;而当CaZrO 3处于非碱性(如Al2O3、Cr2O3、SiO2、ZrO2)环境中,其高温化学性质不稳定。CaZrO3 powder was prepared using CaO,CaCO3 and Ca(OH)2 as calcium source,nano m-ZrO2 powder,micron m-ZrO2 powder,micron CaO partially stabilized ZrO2 (Ca - PSZ) powder as zircon source,through high temperature solid reaction.Effect of the calcination temperature (800,900,1 000,1 100,1 200,1 300,1 400, 1 500 ,and 1 600 ℃) and the holding time (3,4,and 5 h) on the phase composition change was studied to research the synthesis mechanism.The synthesized CaZrO3 powder was mixed with CaO,MgO,Al2O3,Cr2O3,SiO2,and ZrO2 powder separately and fired at 1 500 ℃ for 3 h to prepare specimens to research the high temperature chemical stability of CaZrO3 with different reaction mediums.The results show that during the synthesis process,the CaZrO3 content does not always increase with the increasing calcination temperature or the prolonging holding time,CaZrO3 decomposes resulting from the diffusion of Ca^2+ and O^2- in CaZrO3 to m-ZrO2 or c-ZrO2 .At high temperatures,when CaZrO3 is in alkaline environment (such as environment containing CaO or MgO),the high temperature chemical stability is high,but when CaZrO3 is not in alkaline environment (such as environment containing Al2O3,Cr2O3,SiO2 or ZrO2),the high temperature chemical stability is low.

关 键 词：锆酸钙 合成反应 相组成 离子扩散 显微结构 

分 类 号：TQ175[化学工程—硅酸盐工业]