添加TiO_2对镍铁尖晶石惰性阳极材料性能的影响  

Study on properties of inert anode of NiFe_2O_4 spinel with TiO_2

作　　者：席锦会[1] 姚广春[2] 刘宜汉[2] 谢英杰[2] 

机构地区：[1]中国矿业大学材料科学与工程学院,江苏徐州221008 [2]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《功能材料》2006年第8期1242-1245,共4页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2001AA335010)

摘　　要：为了提高惰性阳极材料的性能,本文尝试在合成镍铁尖晶石过程中掺杂一定量TiO2。采用高温固相反应法在1200℃下烧结6h,制备掺杂TiO2的镍铁尖晶石惰性阳极材料。研究了掺杂TiO2对试样密度、电导率和腐蚀率的影响。研究结果表明,掺杂TiO2后NiFe2O4的晶格产生畸变,从而TiO2促进烧结,提高材料的密度。并且由于Ti4+离子取代Fe3+离子,产生导电电子,改善了NiFe2O4惰性阳极材料的导电性。添加0.5%TiO2可降低材料的腐蚀率,但随着添加量的增加腐蚀率也增加,说明TiO2对材料的抗腐蚀性不利。经研究发现腐蚀率降低的原因是腐蚀过程中NiFe2O4分解产生的Fe2O3与电解质中Al2O3反应生成了FeAl2O4。综合考虑TiO2对材料各性能的影响,最终确定掺杂量为0.5%。In order to improve the properties of inert anode of NiFe2O4 spinel, in this study we tried to add some additive TiO2 to raw materials. NiFe2O4 spinel with TiO2 was made by solid-phase reaction at high temperature for 6h. The effects of TiO2 on density, conductivity and corrosion resistance of sample were researched. The results show that Ti^4＋ replaces parts of Fe^3＋ and the crystal lattice of NiFe2O4 spinel became aberrated, which can promote sinter, improve density. Because Ti^4＋ replaces parts of Fe^3＋ and produces conduction electron, it can improve conductivity. When the content of TiO2 is 0.5 %, the corrosion rate of the sample is lower than that of sample without TiO2. But with the content of TiO2 increasing, the corrosion rate of sample increases also. It shows that TiO2 is not benefit to corrosion resistance. The reason is the sample with TiO2 （〉0.5%） decomposed, and the decomposed product Fe2O3 react with Al2O3 in molten to produce FeAl2O4. Considering the effects of TiO2 on all properties of inert anodes, the optimal amount of TiO2 is 0. 5 %.

关 键 词：镍铁尖晶石 惰性阳极 密度 电导率 抗腐蚀性 

分 类 号：TF777[冶金工程—钢铁冶金]