添加物对低碳镁碳砖抗水化性能的影响

Effects of additives on hydration resistance of low carbon magnesia-carbon brick

为了避免金属Al粉在高温下与C、N2的反应产物AlN和Al4C3的水化导致砖的开裂,研究了外加单质Si粉1%(w)和含铁物质分别为0.5%、1%、1.5%、2%(w)时对低碳镁碳砖抗水化性能的影响,并采用XRD及扫描电镜进行了研究。结果表明:分别添加Si粉和含铁物质时,均能促使试样致密化,有效地提高试样的抗水化性能,其中以外加1%(w)含铁物质的试样水化质量增加率最低,抗水化性能最好;当Si粉和含铁物质复合添加时,可更显著地降低试样的水化质量增加率,试样抗水化性能更优异。

To avoid the brick cracking caused by the hydration of AIN and Al4C3 which are formed by the reactions of metal AI with C and N2 at high temperature,effects of Si powder （1 wt% ） and iron-containing material additions （0.5 wt^% ,1 wt% ,1.5 wt% ,2 wt%） on the hydration resistance of the brick were investigated, and the bricks were characterized by XRD and SEM. The results show that the densification progress and the hydration resistance can be greatly improved by adding Si powder or iron-containing material;the specimen with 1 wt% iron-containing material has the lowest hydration mass increasing rate and the best hydra- tion resistance;when adding Si powder and iron-containing material together,the hydration mass increasing rate decreases significantly ,and the bricks show quite excellent hydration resistance.