|
|
Journal of the Korean Ceramic Society 1985;22(2): 11. |
정저항요업체의 제조와 전기적 성질 |
정형진, 윤상옥 |
한국과학기술원 무기재료연구실 |
Preparation and Electrical Properties of PTCR Ceramic Materials |
|
|
|
|
|
ABSTRACT |
The semiconducting ceramics having positive temperature coefficient of resistivity in he family of 0.25mol% $Sb_2O_3$ doped barium titanates were prepared with AST ($4Al_2O_3$.$9SiO_2$.$3TiO_2$) and $MnO_2$ as additives and these electrical properties were investigated. The PTCR characteristic in these ceramic materials was improved by the addition of AST and $MnO_2$ because the addition of AST decreased the room temperature resistivity and controlled grin size due to the formation of a liquid phase during sintering and the addition of $MnO_2$ improved by forming acceptor level on the intergranular layer. On dependence on the switching time as switching temperature was increased the initial power and switching time increased. |
|
|
|