添加物对镍铁尖晶石惰性阳极微观结构和性能的影响

为了改善镍铁尖晶石陶瓷的抗热震性、抗弯强度等性能,尝试在合成镍铁尖晶石的过程中添加微量添加剂MnO2,TiO2,V2O5,采用粉末冶金法在1200℃下烧结6h,制备掺杂的镍铁尖晶石惰性阳极材料·研究了不同添加剂和添加量对材料烧结和微观结构的影响以及微观结构对材料抗热震性、抗弯强度等性能的影响·研究结果表明,这些添加剂均能不同程度地促进烧结,提高制品的密度·添加MnO2能够细化晶粒,且粒径分布均匀;而TiO2和V2O5使晶粒变大,且大小分布不均匀·因此只有添加MnO2才能够改善制品的抗弯强度和抗热震性·

Effect of Additives on Microstructure and Properties of Inert Anode of NiFe2O4 Spinel

In order to improve the properties of resistances to thermal shock and bending of inert anode of NiFe2O4 spinel, such additives as MnO2, TiO2 and V2O5 in trace amount were added to its raw materials and then they were all sintered together at 1200°C for 6 hr, i.e., preparing a doped inert anode by the process of powder metallurgy. The effects of different kinds and amounts of additives on sintering and microstructure of the inert anode were studied, as well as the effect of microstructure and density on its properties, such as the resistances to thermal shock and bending. The results showed that the three additives can benefit the sintering process to different degrees and improve the density. The additive MnO2 can make grains finer with grain size distributing more uniformly. But TiO2 or V2O5 will make the grains coarser with non-uniform grain size distribution. It means that only MnO2 can improve the resistances to thermal shock and bending.