NiFe2O4合成工艺对惰性阳极力学性能及电导率的影响

研究以NiO和Fe2O3为主要原料合成镍铁尖晶石反应烧结过程中的热力学条件·同时对在不同烧结条件下合成的尖晶石二次烧结制备的阳极试样的抗弯强度及高温电导率进行了测量·结果表明:NiO和Fe2O3固相反应的热力学条件具备,反应先于致密化过程结束·当未经压制成型的粉料直接在合成温度为900℃下合成6h,经破碎工艺及二次烧结后,所制得的惰性阳极试样强度及电导率最大,烧结性能最好·而破碎工艺对增加粉末活性,提高试样电导率及力学性能也十分重要·

Effect of Synthesizing Process of NiFe2O4 on Mechanics Properties and Conductivity of Inert Anode

The reaction-sintering thermodynamic conditions in the synthesizing process of NiFe2O4 with NiO and Fe2O3 as main raw materials were investigated, and the bending strength and high-temperature conductivity of the synthesized spinel inert anode samples sintered secondarily on different conditions were measured. The results showed that the thermodynamic conditions are available to the solid-phase reaction of NiO with Fe2O3, and the solid-phase reaction goes on with the densification process though the former ends up earlier than the later. If an inert anode is synthesized from powdered material at 900°C without precompaction for 6 hours, then crushed up and pressed and sintered secondarily, the bending strength and high-temperature conductivity of the sample are maximum with best sintered performance provided. It was found that the crushing process is also very important to improve the activity of powdered material, as well as improving the sample's conductivity and mechanic properties.