Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第13卷    第3期    总第54期    2003年6月

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文章编号:1004-0609(2003)03-0769-05
铝电解惰性阳极用Ni-Zn铁氧体的固态合成
秦庆伟1, 赖延清1, 张 刚1, 田忠良1,
周新林1, 李 劼1, 刘业翔1, 贺跃辉2

(1. 中南大学 冶金科学与工程学院, 长沙 410083;
2. 中南大学 粉末冶金国家重点实验室, 长沙 410083
)

摘 要: 采用固态合成法分别在惰性气氛和空气下, 制备不同成分的Ni(1-)ZnxFe2O4铁氧体尖晶石。对反应产物的物相、 粒度和形貌的检测表明: 在Ar气保护下煅烧主要发生氧化物的离解反应,反应物无法得到目标物相; 采用反应烧结法制备铝电解金属陶瓷惰性阳极时, 须保持一定的氧分压, 以避免金属氧化物的离解和金属相的氧化; 在空气中, 通过固态反应可制备出理想的铝电解惰性阳极用Ni(1-)ZnxFe2O4尖晶石,其粒度细, 且符合标准正态分布, 烧结温度低, 在1150℃下保温6h即实现完全反应。

 

关键词: (Ni, Zn)Fe2O4; 固态反应; 惰性阳极; 铝电解

Solid state reaction synthesis of
Ni1-xZnxFe2O4 spinel used as matrix of inert anodes in aluminium electroly
QIN Qing-wei1, LAI Yan-qing1, ZHANG Gang1,TIAN Zhong-liang1,
ZHOU Xin-lin1, LI Jie1,LIU Ye-xiang1, HE Yue-hui2

1. School of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China;
2. State Key Laboratory for Powder Metallurgy,
Central South University, Changsha 410083, China

Abstract:Spinel structure oxides seem to be the most promising gradient non-consumable anode matrix materials due to their high stabilization energy. With the purpose of studying the preparation of Ni1-xZnxFe2O4 spinel, several (Ni, Zn)Fe2O4 spinels were synthesized by solid state reaction in air and argon atmosphere. An inert cover gas is necessary during sintering, for the protecting calcined cermet compositions containing free Ni or Cu from oxidation. In argon, NiFe2O4 spinel will be reduced to Ni3Fe, Fe3O4 and FeO during densification. The partial pressure of oxygen is of interest for the preparation of inert anodes. When the spinels are synthesized in air and at 1150℃, no other minerals or residual oxides were found by powder X-ray diffraction. Particle sizes of spinels are fine and consistent with normal distribution.

 

Key words: (Ni, Zn)Fe2O4; solid state reaction; inert anode; aluminium electr

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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