铝电解NiFe_2O_4基惰性阳极材料纤维增强体的选择

Selection of fiber reinforcement for NiFe_2O_4-based inert anode materials in aluminum electrolysis

以NiO和Fe2O3为原料采用固相烧结法合成NiFe2O4尖晶石,通过向其中添加短纤维制备纤维/NiFe2O4惰性阳极材料。为选择适合于NiFe2O4基惰性阳极材料的纤维增强体,对几种纤维在NiFe2O4基体中的高温稳定性进行考察。结果表明,高温下碳纤维、玻璃纤维、氧化铝纤维和碳化硅纤维与NiFe2O4基体是热力学不相容的;1 200℃时镀镍碳纤维和镍纤维不能在基体中稳定存在;1 400℃时ZrO2(f)与NiFe2O4基体具有良好的物理和化学相容性,添加3%ZrO2(f)(质量分数)阳极试样的力学性能得到明显改善。因此,ZrO2(f)可作为NiFe2O4基惰性阳极的纤维增强体。

NiFe2O4 spinel was synthesized via solid-state sintering technology using NiO and Fe2O3 as the raw materials, and fiber/NiFe2O4 inert anode materials were prepared by adding short fiber into NiFe2O4. The high temperature stability of some fibers in NiFe2O4 matrix was investigated to select the appropriate fiber reinforcement for NiFe2O4-based inert anode materials. The results indicate that carbon fiber, glass fiber, alumina fiber and silicon carbide fiber are thermodynamically incompatible with the NiFe2O4 matrix, also the nickel-coated carbon fiber and nickel fiber cannot stably exist in the matrix at 1 200℃, while ZrO2（f）has favorable physical and chemical compatibility with the NiFe204 matrix at 1 400℃. The mechanical properties of the anodes samples are improved significantly by adding 3% ZrO2（f） （mass fraction）. Therefore, ZrO2（f） can be used as the fiber reinforcement for NiFe204-based inert anode.