【摘要】 通过固态反应,在1150℃、6h下制备出铝电解惰性阳极用NiFe2O4尖晶石粉末。经XRD物相分析,产物的衍射线位置和强度高低等和标准多晶衍射数据重合。SEM形貌观察,粒子为等轴形。通过制陶试验,考察了压制方式、粉末粒度、温度等因素对陶瓷体积密度和径向收缩率的影响,结果发现,双向压制较单向压制能实现较高的体积密度,压坯中密度分布的不均匀在很大程度上可以用双向压制来改善;尽可能降低粉末粒度能促进烧结,对制备致密化陶瓷有利;适当提高温度能促进烧结,提高体积密度。NiFe2O4陶瓷在Na3AlF6—Al2O3中的溶解性试验表明,镍和铁的饱和溶解度都极低,并不按化学计量数(1∶2)溶解。更多还原

【Abstract】 NiFe2O4 spinel powders was produced in air for 6 hours at 1150℃ by solid state reaction. No residual oxides were found by examination with powder X-ray diffraction. The synthesized material was characterized by SEM. Particle size distribution, consolidation pressures and sintering temperatures have been investigated in the ceramics fabrication processes. The research results indicated that in the two individual oxides, Fe2O3 and Ni2O3 for forming NiFe2O4, the latter imparted a high degree of dimensional stability to the anode because of the very low but finite solubilities in cryolite-based melts. The ceramics were tested using an equilibration technique under usual condition(1.1 bath ratio, 5 wt.% CaF2, 5 wt.% Al2O3 at 960℃). The results showed that NiFe2O4 ceramics was one of the most promising inert anode matrix materials.更多还原