摘要
采用改进的传统陶瓷工艺,分别制备了无Mn掺杂和0.5%(摩尔分数)Mn CO3或Mn O2取代传统组分中的非Pr稀土Zn Pr O基压敏陶瓷。利用电子天平、扫描电镜、I-V耐压测试仪研究了三组样品的密度、显微组织形貌、电性能,重点采用高温直流加速老化的方法研究三组样品的抗直流老化特性。结果显示:Mn CO3或Mn O2掺杂样品的压敏电压、非线性系数分别达到1091 V/mm、30和1396.5 V/mm、31.6,而无Mn掺杂的样品对应的性能参数为5410 V/mm、17.9。老化后,Mn CO3掺杂样品压敏电压和非线性系数基本保持不变;而Mn O2掺杂的分别降低了3.1%和10.7%,两组样品的漏电流变化不大。无Mn掺杂的样品在第三阶段老化时发生击穿现象。实验结果表明,Mn CO3是一种替代非Pr稀土元素制备具有高抗直流老化特性Zn Pr O基压敏陶瓷的有效掺杂。
0. 5% mol Mn CO3 or Mn O2 dopant Zn O- Pr6O11（ Zn Pr O） based varistors ceramics with no non- praseodymium rare earth elements were fabricated by a modified traditional ceramic process respectively. The density,microstructure,electrical characteristics of these ceramics were investigated using an electronic scale,a Zeiss Supra55 SEM and an I- V monitor. Especially,high temperature DC aging tests were systematically carried out in order to study the anti- DC- aging property of the ceramics. An extra batch of sample without Mn dopant was also prepared and studied for comparison. The result shows that the breakdown field and nonlinear coefficient of Mn CO3 or Mn O2 doped Zn Pr O based varistors ceramics are 1091 V /mm,30 and 1396. 5 V / mm,31. 6 respectively,while the parameters of non- Mn are 5410 V / mm,17. 9. After aging,the breakdown field and nonlinear coefficient of Mn CO3 doped Zn Pr O based varistors ceramics almost remain unchanged. On the contrary,above mentioned two properties of the Mn O2 doped samples reduce by 3. 1% and 10. 7% respectively. The leak current densities of all Mn doped samples show no obvious changes. Meanwhile,electric current induced thermal breakdown was observed in the samples without Mn dopant at the third stage of aging. Our result in general shows Mn CO3 is a very effective dopant to replace non- praseodymium rare earth oxides for the fabrication of Zn Pr O based varistor ceramics with good resistance to DC aging.
出处
《稀土》
EI
CAS
CSCD
北大核心
2015年第5期107-112,共6页
Chinese Rare Earths
