CAJ | 학술논문

为了得到低B值(2 100 K)、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%.
위료득도저B치(2 100 K)、고정도호환、균균성호적NTC열민전조기,채용취합락합법제비료Mn0.43Ni0.90CuFe0.67O4 NTC열민재료적전구체,재500 ℃진행열분해후획득양화물,경불동온도미파단소,학정최가온도후성형,분별진행미파소결여상규소결.채용TGA-DTA、FT-IR、XRD、립도분석급SEM등수단,대재료진행표정.결과표명:미파단소최가온도위650 ℃,도자체유결동상화부동상량상조성;미파소결대대제고료원건적균균성,성품솔유상규소결적30%제고지85%.
In order to obtain NTC thermistor with low B value (2 100 K), high-precision、exchange-type and fine homogeneity, Mn0.43Ni0.90CuFe0.67O4 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, FT-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 80% from 30% compared with the one of conventional sinter.