【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%。更多还原

【Abstract】 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 Ti⁴+ replaces parts of Fe³+ and the crystal lattice of NiFe₂O₄ spinel became aberrated,which can promote sinter,improve density.Because Ti⁴+ replaces parts of Fe³+ 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%.更多还原