MnNiCuFe系材料的聚合络合法制备及微波烧结  

Microwave sinter of Mn_(0.43)Ni_(0.90)CuFe_(0.67)O_4 thermistor materials prepared by polymerized complex method

作　　者：靳先静[1,2] 常爱民[1] 张惠敏[1,2] 张东炎[1,2] 

机构地区：[1]中国科学院新疆理化技术研究所,新疆乌鲁木齐830011 [2]中国科学院研究生院,北京100049

出　　处：《电子元件与材料》2009年第8期30-34,共5页Electronic Components And Materials

基　　金：乌鲁木齐市科技攻关项目(No.G06211002);乌鲁木齐市种子基金资助项目(No.K08141001)

摘　　要：为了得到低B值(2100K)、高精度互换、均匀性好的NTC热敏电阻器,采用聚合络合法制备了Mn0.43Ni0.90CuFe0.67O4 NTC热敏材料的前驱体,在500℃进行热分解后获得氧化物,经不同温度微波煅烧,确定最佳温度后成型,分别进行微波烧结与常规烧结。采用TGA-DTA、FT-IR、XRD、粒度分析及SEM等手段,对材料进行表征。结果表明:微波煅烧最佳温度为650℃,陶瓷体由缺铜相和富铜相两相组成;微波烧结大大提高了元件的均匀性,成品率由常规烧结的30%提高至85%。In order to obtain NTC thermistor with low B value （2 100 K）, high-precision, exchange-type and fine homogeneity, Mn0.43Ni0.90CuFe0.6704 NTC thermistor material precursors were prepared by the polymerized complex method. The oxide mixtures were attained from calcining of the polymerized gel precursor at 500℃ and then were microwave-calcined at different temperatures to determine the optimum temperature. The materials were then microwave and conventionally sintered after forming. The materials were characterized by TGA-DTA, Fr-IR, XRD, particle size analyzer, SEM and EDS. The experimental results indicate that the particles microwave calcined at 650℃ were small and uniform. The ceramics mainly consist of rich-Cu phase and poor-Cu phase. The homogeneity of components is significantly increased by microwave sinter. Moreover, the rate of finished products is increased to 85% from 30% compared with the one of conventional sinter.

关 键 词：聚合络合法 微波煅烧 微波烧结 Mn0.43Ni0.90CuFe0.67O4 热敏材料 

分 类 号：TN304.2[电子电信—物理电子学]