华中科技大学学报（自然科学版）2011，Vol.39Issue(6)：46-49,4.
片式PTC热敏电阻瓷片再氧化工艺的研究
Reoxidation process of thermistor ceramics of laminated PTC
摘要
Abstract
1. 6% Y donor doped barium titanate nanocrystalline powder was prepared by sol-gel technique with barium acetate (Ba(CH3COO)2), Tetrabutyl titanate (Ti(OC4H9)4) and nitric acid yttrium (Y(NO3)3 · 6H2O) as raw materials. The ceramics for laminated PTCR (positive temperature coefficient resistance) was prepared by the powder. Boron nitride (BN) and barium titanate were used as the glass phase. Tape-casting method was used to form the green sheets. The green sheets were sintered at a reducing atmosphere of 97% N2-3% H2. The effects of reoxidation on the electrical properties of the PTC (positive temperature coefficient) ceramics were studied by using different reoxidation temperature and time to reoxidize the samples. The results show that the room temperature resistivity first increases and then decreases when the temperature of the reoxidation increases, and the PTC effect gradually increase; room temperature resistivity appears a minimum with the increase of reoxidation time, while the PTC effect is not influenced greatly by the reoxidation time; the withstand voltage increases with the increase of reoxidation temperature and/or time.关键词
叠层片式PTC/再氧化/还原气氛烧结/自发极化/势垒Key words
laminated PTC/ reoxidation/ reducing sintering/ spontaneous polarization/ barrier分类
信息技术与安全科学引用本文复制引用
龚树萍,邓钊洁,刘剑桥,刘欢..片式PTC热敏电阻瓷片再氧化工艺的研究[J].华中科技大学学报（自然科学版）,2011,39(6):46-49,4.基金项目
国家高技术研究发展计划资助项目(SQ2008AA03Z4471960). （SQ2008AA03Z4471960）
