黃伯云2， 劉業(yè)翔1
(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院，長(zhǎng)沙 410083;
2. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室， 長(zhǎng)沙 410083)
摘 要: 研究添加劑CaO含量和燒結(jié)溫度對(duì)CaO摻雜10NiO-NiFe2O4復(fù)合陶瓷的物相組成和電導(dǎo)率的影響。 結(jié)果表明： CaO含量在0~4%范圍內(nèi)， 燒結(jié)試樣的X射線衍射譜僅有NiO和NiFe2O4的衍射峰； 10NiO-NiFe2O4復(fù)合陶瓷在空氣中升溫過(guò)程存在明顯的吸氧和失氧行為； CaO含量對(duì)1 473 K燒結(jié)的10NiO-NiFe2O4復(fù)合陶瓷的電導(dǎo)率影響顯著； 當(dāng)CaO含量為0~1%時(shí)， 隨測(cè)試溫度的升高， 材料電導(dǎo)率逐漸增大， 隨后在773~923 K出現(xiàn)1~2個(gè)數(shù)量級(jí)的突降， 然后重新緩慢增大； 當(dāng)CaO含量為2%和4%(質(zhì)量分?jǐn)?shù)， 下同)時(shí)， 材料電導(dǎo)率在298~1 233 K范圍內(nèi)隨著測(cè)試溫度的升高而增大； 2%CaO摻雜10NiO-NiFe2O4復(fù)合陶瓷在不同測(cè)試溫度下均具備最高電導(dǎo)率， 1 233 K下達(dá)到16.29 S/cm， 遠(yuǎn)高于未摻雜試樣的1.03 S/cm； 燒結(jié)溫度由1 473 K提高到1573 K時(shí)， 未摻雜試樣在1 233 K時(shí)電導(dǎo)率提高近15倍， 2%CaO摻雜試樣1 233 K時(shí)電導(dǎo)率略有提高。
關(guān)鍵字: 10NiO-NiFe2O4; CaO; 導(dǎo)電性能; 惰性陽(yáng)極; 鋁電解
HE Yue-hui2, HUANG Bai-yun2, LIU Ye-xiang1
（1. School of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy,
Central South University, Changsha 410083, China）
Abstract: The effects of CaO content, in the range from 0% to 4%, and sintering temperature on the phase composition and electrical conductivity of CaO doped 10NiO-NiFe2O4 composite ceramics were studied. The results show that the composites consist of NiO phase and NiFe2O4 phase. There is an apparent oxygen absorbing and releasing behavior during the heating process in air for 10NiO-NiFe2O4 composites. The electrical conductivity of composites sintered at 1 473 K markedly depends on the CaO content. As the CaO content is in the range from 0% to 1%, the conductivity increases firstly with the temperature increasing from room temperature to 773 K, then abruptly decreases with one or two orders of magnitude at the temperature between 773 K and 923 K, and finally increases gently with the temperature increasing from 923 K to 1 233 K. As the CaO content is in the range from 2% to 4%, the conductivity increases with the temperature increasing without a decreasing phenomenon. The maximum conductivity of 16.29 S/cm at 1 233 K is obtained for composites doped with 2%CaO, compared to the 1.03 S/cm of the undoped composites. As the sintered temperature increases from 1 473 K to 1 573 K, the electrical conductivity at 1 233 K increases about 15 times for the undoped composites, compared to a slight increase for the 2%CaO doped composites.
Key words: 10NiO-NiFe2O4; CaO; electrical conductivity; inert anode; aluminum electrolysis
