Al_2O_3含量对Ni_(0.6)Mn_(2.4-x)Al_xO_4热敏材料性能的影响
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摘要
采用传统固相反应法制备了Ni_(0. 6)Mn_(2. 4-x)Al_xO_4(x=0.08,0.1,0.12,0.14,0.16,0.18)热敏陶瓷材料。借助XRD、SEM和电性能测试手段,系统地分析了Al_2O_3含量和烧结温度对该热敏陶瓷组织结构、电性能及其稳定性的影响。结果表明,Al_2O_3的增加不会改变Ni_(0. 6)Mn_(2. 4-x)Al_xO_4陶瓷的晶体结构,但其最佳烧结温度有所不同,Al_2O_3含量越高,致密化所需烧结温度也越高。增加Al_2O_3含量有助于减小晶粒尺寸,增加晶界,最终使室温电阻率ρ_(25)和B值均增加。高温300℃/100 h下的老化系数明显比常规150℃/1000 h要高,其中电阻率的最大老化系数为7.02%。
The Ni_(0. 6)Mn_(2. 4-x)Al_xO_4(x=0.08,0.1,0.12,0.14,0.16,0.18) thermistor ceramic materials were prepared by the traditional solid state reaction method.The effects of Al_2O_3 content and sintering temperature on the structure and property of MnNiAl thermistor ceramics were studied systematically through XRD,SEM and electrical properties characterization.The results show that the crystal structure of MnNiAl thermistor ceramic materials remains the same with the increase of Al_2O_3 content.However,the higher the content of Al_2O_3,the higher the sintering temperature is needed for densification.With the increase of Al_2O_3 content,the grain size of the MnNiAl thermistor materials decreases and the grain boundaries increases,leading to the increment of room temperature resistivity ρ_(25) and B value.At 300 ℃/100 h,the aging coefficient is obviously higher than that at 150 ℃/1000 h,and the maximum aging coefficient of resistivity is 7.02%.
The Ni_(0. 6)Mn_(2. 4-x)Al_xO_4(x=0.08,0.1,0.12,0.14,0.16,0.18) thermistor ceramic materials were prepared by the traditional solid state reaction method.The effects of Al_2O_3 content and sintering temperature on the structure and property of MnNiAl thermistor ceramics were studied systematically through XRD,SEM and electrical properties characterization.The results show that the crystal structure of MnNiAl thermistor ceramic materials remains the same with the increase of Al_2O_3 content.However,the higher the content of Al_2O_3,the higher the sintering temperature is needed for densification.With the increase of Al_2O_3 content,the grain size of the MnNiAl thermistor materials decreases and the grain boundaries increases,leading to the increment of room temperature resistivity ρ_(25) and B value.At 300 ℃/100 h,the aging coefficient is obviously higher than that at 150 ℃/1000 h,and the maximum aging coefficient of resistivity is 7.02%.
引文
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本文系“第十七届全国电介质会议暨第十九届全国电子元件会议及2018国际固态制冷材料和器件研讨会”会议论文。
[2]Ma C J,Liu Y F,Lu Y N,et al.Preparation and electrical properties of Ni0.6Mn2.4-xTixO4 NTC ceramics [J].Journal of Alloys and Compounds,2015:931-935.
[3]黄祖映,卢振亚,陈志武.Ni、Cu含量对Mn-Ni-Cu-O系NTC热敏材料电性能的影响 [J].稀有金属材料与工程,2015,44(S1):141-144.
[4]黄延民,沓世我,杨丙文,等.Co含量对Ni 0.9-0.5xCo0.3+1.5xMn1.8-xO4热敏电阻性能的影响 [J].电子元件与材料,2015,34(8):26-29.
[5]王忠兵,李凤霞,汪洋,等.Ni-Mn-Sn-O体系相组成及其在负温度系数热敏电阻中的应用 [J].硅酸盐学报,2015,43(6):776-780.
[6]王忠兵,吴蕾,赵肃莹,等.掺杂对Ni-Mn-O系NTC热敏陶瓷及其电学性能的影响 [J].硅酸盐学报,2009,37(6):927-931.
[7]黄霞,姚金城,常爱民,等.Al2O3掺杂对MnCoNi系NTC热敏电阻材料性能的影响 [J].电子元件与材料,2011,30(7):25-28.
[8]张静,袁梦鑫,杨彦.Al2O3掺杂对MnCoNi系NTC热敏电阻材料性能的影响研究 [J].硅谷,2014,7(16):49-50.
[9]王卫民.尖晶石系NTC热敏电阻材料导电机理的研究进展 [J].安阳师范学院学报,2005(2):41-45.
[10]王忠兵,吴蕾,韩效钊,等.NTC热敏陶瓷Ni0.66Mn2.34-xCoxO4的电性能研究 [J].电子元件与材料,2009,28(7):17-19.
[11]刘旭.Mn-Co-Fe-(Zn)-O系热敏材料制备及稳定性研究 [D].乌鲁木齐:新疆大学,2017.
本文系“第十七届全国电介质会议暨第十九届全国电子元件会议及2018国际固态制冷材料和器件研讨会”会议论文。