Calcium Behaviors in MnZn Ferrite at Different Temperatures
MnZn ferrites have been widely used as magnetic core materials.It is well known that Ca addition is effective to obtain homogeneous microstructure of fine grains and highly resistive grain boundaries.However,the behaviors of calcium as one of the main additives at different temperature ranges during sintering process are not completely understood yet.In this study,the influence of CaCO3 content and sintering temperature on the microstructure was investigated in 1473-1623 K.It was found that there existed a critical temperature around 1550 K.The grain size decreased with the increase of Ca content when the sintering temperature was lower than the critical temperature,but completely opposite result was observed at higher temperatures range.Possible mechanisms were discussed.When the sintering temperature was lower than the critical temperature,Ca content greatly affected the grain boundary mobility and dominated the grain growth.At higher temperatures,however,formation of liquid phases might be the main cause for the grain growth.
MnZn Ferrite Calcium Grain boundary Liquid phase
Yaqiu Cai Y.Lin X.Li J.Huang T.Aoki
Materials Research Center,TDK Xiamen Co.,Ltd.,Lian Sheng Rd.1-19＃,North Industrial District,Jimei,Xi Materials & Process Development Center,TDK Corporation,570-2,Matsugashita,Minamihatori,Narita,Chiba
国际会议
The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))
厦门
英文
1412-1415
2011-11-04（万方平台首次上网日期，不代表论文的发表时间）