采用流变相法制备了NiMn2 O4负温度系数热敏电阻材料,重点研究了不同煅烧温度和烧结温度对NiMn2 O4热敏电阻材料微观形貌和电学性能的影响,并且借助XRD、SEM以及电学测试等手段对其进行了表征.研究结果表明,煅烧温度为850℃时,粉体主要由立方尖晶石相和少量的NiO相组成;当烧结温度为1150℃时,陶瓷样品具有最低的室温电阻率、最高的材料常数B值以及最低的电阻漂移率(ΔR/R),分别为2679Ω?cm、3878 K和0.75%~0.86%.而且不同烧结温度下的陶瓷样品电导激活能都在0.33 eV左右.因此,流变相法制备的NiMn2 O4陶瓷材料具有良好的热稳定性以及热敏性能,满足市场发展的需要.
NiMn2 O4 negative temperature coeifficient (NTC)thermistor materials were prepared by the rheolog-ical phase method.The effect of calcination temperature and sintering temperature on the microstructure and e-lectrical properties of NiMn2 O4 ceramic materilas was systemically investigated and characterized by XRD, SEM,and electrical mearsurement.The results indicate that the NiMn2 O4 powders are mainly composed of cu-bic spinel phase and a small amount of NiO phase at the calcination temperature of 850 ℃.At the sintering tem-perature of 1150 ℃,the values of ceramic samples with the lowest resistivity at room temperature (ρ25 ),the maximum value of the material constant B and the lowest resistivity drift rate (ΔR/R),are 2679 Ω?cm, 3878 K and 0.75%-0.86%,respectively.The activation energy of NiMn2 O4 ceramic samples sintered at differ-ent temperatures is about 0.33 eV.Therefore,NiMn2 O4 ceramic materials prepared by the rheological phase have well thermal stability and thermal performance and meet the demands of market development.
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