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研究了硼酸-硫酸铝-白炭黑复合体系浸渍剂对炭电极材料抗氧化性能的影响。首先用单种不同浓度的浸渍剂(硼酸、硫酸铝和白炭黑)处理碳电极样品,在800℃静态空气下进行氧化失重实验,考察上述浸渍剂的含量对炭电极氧化失重率的影响。结果显示,随着硼酸浓度的增加,炭电极的失重率基本上呈下降趋势,浓度大于4%后减少变弱;随着硫酸铝浓度的增加,炭电极的失重率先减小后增大,浓度为6%最好;随着白炭黑浓度的增加,炭电极的失重率亦先减小后增大,以浓度为1%最佳;然后基于上述结果,进行配方正交实验设计,采用三因素四水平正交设计方案,通过极差计算对正交实验结果进行分析,确定最佳配方为硼酸、硫酸铝、白炭黑配比为5∶4∶1。最后,实验研究了浸渍次数对炭电极材料的抗氧化性能的影响。此外对炭电极抗氧化机理进行初步分析。
The effect of boric acid-aluminum sulfate-silica composite impregnant on the oxidation resistance of carbon electrode materials was studied. Firstly, the carbon electrode samples were treated with different impregnants (boric acid, aluminum sulfate and white carbon) with different concentrations. Oxidative weight loss experiments were carried out under static air at 800 ℃. The effects of the above impregnant content on the oxidative weight loss of carbon electrode were investigated. The results showed that with the increase of boric acid concentration, the weight loss rate of carbon electrode basically decreased. When the concentration was more than 4%, the weight loss decreased. With the increase of aluminum sulfate concentration, the weight loss rate of carbon electrode first decreased and then increased. 6% is the best. With the increase of silica concentration, the weight loss rate of carbon electrode decreases first and then increases to the best concentration of 1%. Based on the above results, Factor orthogonal design scheme of four levels, the orthogonal experimental results were analyzed by range calculation to determine the best formula for the boric acid, aluminum sulfate, white carbon black ratio of 5: 4: 1. Finally, the effect of impregnation times on the oxidation resistance of the carbon electrode material was experimentally studied. In addition, the oxidation mechanism of carbon electrode was analyzed.