(1. 江蘇大學(xué) 材料科學(xué)與工程學(xué)院, 鎮(zhèn)江 212013; 2. 上海大學(xué) 納米科學(xué)與技術(shù)研究中心, 上海 200444)
摘 要: 采用裸燒、蓋燒和埋燒等不同的燒結(jié)方式制備ZnO-Bi2O3壓敏瓷，通過XRD和SEM等方法對(duì)壓敏瓷的物相和顯微組織進(jìn)行研究，探討燒結(jié)方式對(duì)氧化鋅壓敏瓷電性能和顯微組織的影響。結(jié)果表明：燒結(jié)方式和燒結(jié)溫度對(duì)壓敏瓷的顯微組織和電性能產(chǎn)生明顯的影響。對(duì)于裸燒、蓋燒和埋燒來說，1 100 ℃均為最佳的燒結(jié)溫度； 1 000 ℃時(shí)埋燒得到的壓敏瓷的電性能較好，1 100 ℃和1 200 ℃時(shí)裸燒得到的壓敏瓷的電性能較好；燒結(jié)方式對(duì)于Bi2O3揮發(fā)控制的強(qiáng)弱順序?yàn)槁駸⑸w燒、裸燒。
關(guān)鍵字: ZnO-Bi2O3壓敏瓷；氧化鋅；燒結(jié)；揮發(fā)
ZnO-Bi2O3 based varistor ceramics
（1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
2. Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, China）
Abstract:ZnO-Bi2O3 based varistor ceramics were sintered by using different sintering processes, open sintering, sintering inside a closed crucible and sintering within a powdered bed. The phases and microstructures of the varisotr ceramics were investigated by XRD and SEM. The effects of sintering process on electrical properties and microstructures of ZnO-Bi2O3 based varistor ceramics were discussed. The results show that the sintering process and sintering temperature have obvious effect on the microstructure and electrical properties of the samples. Optimal values for the electrical characteristics of the varistor ceramics by three kinds of sintering processes are obtained when the sintering is conducted at 1 100 ℃. At 1 000 ℃, the samples sintered within a powdered bed show better electrical properties than those subjected to the other two processes, while at 1 100 ℃ or 1 200 ℃, the open sintering samples exhibit better electrical properties. These results also show that Bi2O3 vaporization in three sintering processes is in the order from strong to weak as follows: sintering within a powdered bed, sintering inside a closed crucible, open sintering.
Key words: ZnO-Bi2O3 based varistor ceramics; zinc oxide; sintering; volatilization
