原料粒度组成对铝电解惰性阳极性能的影响

Effect of on grain composition on properties of inert anodes

为了改善金属相在金属陶瓷惰性阳极中的分布以改善阳极材料的性能,对国内外通常采用的镍铁尖晶石粉末制备惰性阳极的工艺进行了改进,原料不是完全采用细粉,而是采用粒度级配,大小不同的颗粒配合起来使用。研究发现,采用粒度级配制得的试样性能比不采用粒度级配制得的试样性能要好。尤其重要的是对于一定规格的试样采用合适的粒度级配,金属相Ag在陶瓷基体中分布呈明显的网状分布,金属相分布状态的优化有利于试样各方面性能的提高。

Generally,the NiFe2O4 fine powder as ceramics raw material is adopted to prepare cermet inert anodes. But the metal phase can＇t form the network structure by the conventional preparing technique and it is inevitable to affect the final properties of inert anodes. In this study,in order to improve the distribution of metal phase in the cermet inert anodes, grains graduation was adopted, that is, the ceramics raw material is not total fine powder,but the different size of grains being blended together. It is found that the properties of the samples with grain graduation are better than that of samples without grain graduation. More importantly,when appropriate grain graduation according to certain-sized sample is used,metal Ag can form the network structure in the ceramics matrix. The optimized distribution of Ag can be beneficial to increasing the properties of samples.