金属陶瓷性能的影响
(1. 中南大学 冶金科学与工程学院, 长沙 410083; 2. 湖南大学 材料科学与工程学院, 长沙 410082)
摘 要: 采用冷压−烧结技术制备NiFe2O4-10NiO基金属陶瓷材料；通过对烧结体的显微结构和物相组成、电导率、电解试样的表层形貌、电解质和阴极铝的杂质增量等的分析检测，研究Yb2O3掺杂对15(20Ni-Cu)/ NiFe2O4-10NiO金属陶瓷致密度、导电率和耐腐蚀性能的影响。结果表明：1 300 ℃烧结的0.5%Yb2O3-15(20Ni-Cu)/ (NiFe2O4-10NiO) 金属陶瓷具有较好的性能，相对密度为98.53%，960 ℃时的电导率为53.06 S/cm，电解腐蚀后金属腐蚀层厚度为20~30 µm，总杂质增量为0.079 g。
关键字: 金属陶瓷；Yb2O3；掺杂；惰性阳极；铝电解
15(20Ni-Cu)/(NiFe2O4-10NiO) cermets
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. School of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:NiFe2O4-10NiO based cermets were prepared with the cold isostatic pressing−sintering process. Based on the study of the microstructure and phase composition after sintering, electrical conductivity, surface morphology after electrolysis, impurity increment in electrolyte and cathode aluminum, the effects of Yb2O3 doping on relative density, electrical conductivity and corrosion resistance of 15(20Ni-Cu)/(NiFe2O4-10NiO) cermets were analyzed. The results show that the cermets of 0.5%Yb2O3-15(20Ni-Cu)/(NiFe2O4-10NiO) sintered at 1 300 ℃ has better properties: the relative density of 98.53%，the electrical conductivity at 960 ℃ of 53.06 S/cm, the thickness of metal corrosion layer of 20−30 μm after electrolysis, and the total impurity increment in electrolyte and aluminum of 0.079 g.
Key words: cermets; Yb2O3; doping; inert anode; aluminum electrolysis
