Densification of Ni-NiFe_2O_4 cermets for aluminum electrolysis

• 作 者: 赖延清 孙小刚 李劼 段华南 李新征 张刚 田忠良
• 机 构: School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China,Sc
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2005年03期
• 关键词: electrolysis ceramics creasing shrinkage ceramic sintering FeNi penetration pres

The density of cermet inert anodes in aluminum electrolysis is of great importance. Ni-NiFe_2O_4 cermets were studied with respect to their densification affected by ball milling time, particle size of raw powders, contents of metallic phase, sintering atmosphere and temperature. The results show that, prolonging ball milling time will increase the density with the optimum value of 150min; cermets containing 0-15%Ni(mass fraction) have high relative density ranging from 94% to 96%, but with Ni content increasing, the density slightly decreases; weak reductive atmosphere is favorable to densification; the relative density increases from 80.38% to 96.85% with the sintering temperature increasing from 1100℃ to 1300℃ while it decreases at 1400℃, which may be due to crystal grain coarsening. So the sintering temperature of Ni-NiFe_2O_4 cermets in current work should be controlled at 1300℃, where the relative density is 96.85%.

The density of cermet inert anodes in aluminum electrolysis is of great importance. Ni-NiFe 2 O 4 cermets were studied with respect to their densification affected by ball milling time, particle size of raw powders, contents of metallic phase, sintering atmosphere and temperature. The results show that prolonging ball milling time will increase the density with the optimum value of 150min; cermets containing 0-15% Ni (mass fraction) have high relative density ranging from 94% to 96%, but with Ni content increasing, the density slightly reduced; weak reductive atmosphere is favorable to densification; the relative density increases from 80.38% to 96.85% with the sintering temperature increasing from 1100 ℃ to 1300 ℃ while it decreases at 1400 ℃, which may So the sintering temperature of Ni-NiFe_2O_4 cermets in current work should be controlled at 1300 ℃, where the relative density is 96.85%.