SiCw增强NiFe2O4基惰性阳极材料的力学性能

为改善铝电解惰性阳极用NiFe2O4尖晶石材料存在的不足，采用固态合成法制备了SiCw/NiFe2O4复合材料. 研究了SiCw添加量对体积密度、气孔率、冲击韧性、热震性等力学性能的影响，并与纯NiFe2O4尖晶石对比，利用扫描电子显微镜观察显微组织，分析了其性能差异的原因. 实验结果表明，添加SiCw可以显著改善NiFe2O4尖晶石的力学性能，含2% SiCw的试样冲击韧性比尖晶石提高了近65%；添加量为3%时抗弯强度比NiFe2O4尖晶石基体强度提高了近42%，经一次热震后强度保持率可提高15%，综合考虑SiCw添加量以3%为宜.

Research on Mechanical Properties of SiCw/NiFe2O4 Spinel Used as Matrix of Inert Anode

In order to improve the mechanical properties of NiFe2O4 spinel used as the matrix of inert anode in aluminium electrolysis, SiCw/NiFe2O4 was prepared by solid-state reaction. The effect of addition level of SiCw on the density, porosity, impact toughness and thermal shock resistance of the material were investigated, at the same time microstructural changes were observed by scanning electronic microscope. The reasons for the difference of properties of samples were discussed deeply. The results showed that mechanical properties were improved considerably in comparison with the NiFe2O4 spinel. Bending strength of specimen with 3%(w) SiCw was increased about 42% and strength retention was 15% after thermal shock，impact toughness of specimen with 2%(w) SiCw was raised about 65%. The properties of specimen were appropriated when it contained 3%(w) SiCw by comprehensive consideration.