摘要
将金属Ni加入到(Ba,Sr)TiO3陶瓷基质中来制备低阻复合PTC材料。复合材料在石墨粉形成的弱还原气氛下烧成后,Ni主要以单质态存在。研究了添加Al2O3-SiO2-TiO2(AST)与PbO-B2O3-ZnO-SiO2玻璃料对复合材料微观结构和电性能的影响。与AST一样,玻璃料可作为复合材料的烧结助剂,更突出的是玻璃料能实现金属Ni在陶瓷基质中的均匀分布。从烧结助剂引起的陶瓷基质和金属分布两方面的变化来讨论复合材料的电性能。采用玻璃料作为烧结助剂,复合材料获得了较低的室温电阻率和较高的升阻比。
Nickel was added to （Ba,Sr）TiO3 ceramic matrix to form PTC composite with low room-temperature resistivity. Metallic nickel is the main chemical state after sintering in a mildly reducing atmosphere produced by graphite powder. The effect of Al2O3-SiO2-TiO2 （AST） and PbO-B2O3-ZnO-SiO2 glass on the microstructures and PTC characteristics of Ni/（Ba,Sr）TiO3 composite was investigated. Like the conventional AST, glass can work as the sintering aid for the composite. Most significant is that more homogeneous Ni distribution in the ceramic matrix is obtained by employing glass as the sintering aid. Based on the ceramic matrix and metal distribution changes arising from the sintering aids, the electrical properties were discussed. Lower room-temperature resistivity and higher PTC jump are obtained for the glass-added composite.
出处
《压电与声光》
CSCD
北大核心
2009年第4期531-534,共4页
Piezoelectrics & Acoustooptics
基金
中国博士点基金资助项目(20050056055)
