ZnO－MgO－Al_2O_3陶瓷性能研究

Properties of ZnO-MgO-Al_2O_3 ceramics

ＺｎＯ－ＭｇＯ－Ａｌ２Ｏ３陶瓷是一种复合烧结体，其主晶相为ＺｎＯ与ＺｎＡｌ２Ｏ４，且均以晶粒存在．ＭｇＯ能调节电阻温度系数，使之由负变为正．Ａｌ２Ｏ３能调节电阻率．慢的降温速度能提高线性及耐浪涌能量，降低电阻温度系数．

ZnO-MgO-Al2O3 ceramic is a composite sintered body of crystal grains of ZnO and ZnAl2O3, and having no grain boundary layer of higher electric resistance than that of the crystal grains of ZnO. The resistance-temperature coefficient can be changed from negative to positive with the increase of MgO content, the resistivity is increased with the increase of Al2O3 content. Slow cooling speed can improve the properties of ZnO-MgO-Al2O3 ceramics.