摘要
本文根据单相的个体特性选择堇青石和ＴｉＣ两相复合制备出了导电型的红外辐射陶瓷材料。对体系电性能进行研究发现，体系电导率值随ＴｉＣ含量的变化呈非线性变化，ＴｉＣ含量在９％ｗｔ以下时，体系电导率在１０￣（－１）Ｓ／ｃｍ以下，而从９％ｗｔ开始，随着ＴｉＣ含量的增加，体系的电导率迅速增加，幅度达几个数量级之多。通过电子探针分析我们认为，材料的导电是由ＴｉＣ相形成的导电通路所提供的，其导通过程是一种逾渗过程。根据渗流理论对体系的导电特性进行分析，可以很好地说明电导率发生的突跃现象，由此得到了本复合体系的导电模型。利用这种模型可以从理论上预测某一给定ＴｉＣ含量时系统电导率值的大小，使体系的电导率可控可调。
According to thier properties,cordierite and TiC were chosen to compound ainfrared nadiation ceramic system. Studing electricproperty of this system,we noticed that theconductivity had nonlinear change with the changeof TiC contert.TiC contert being below 9%wt,theconductivity xvas below 10￣(-10)S/cm, but being above9%wt,the conductivity increased rapidly to a greatextent of everal orders. according to EPMAanalysis, we thought that the conductivity of thematerial Was provided by TiC phase which formed aconduct path,and the process of condution was apcrcolation,which gave us a conduct model.Withthe model, we could know the conductivity of thematerial with a given TiC content.Then we couldcontrol and adjust the conductivity.
出处
《功能材料》
EI
CAS
CSCD
1994年第6期556-560,共5页
Journal of Functional Materials
