金屬陶瓷性能的影響
(1. 中南大學(xué) 冶金科學(xué)與工程學(xué)院, 長沙 410083; 2. 湖南大學(xué) 材料科學(xué)與工程學(xué)院, 長沙 410082)
摘 要: 采用冷壓−燒結(jié)技術(shù)制備NiFe2O4-10NiO基金屬陶瓷材料；通過對燒結(jié)體的顯微結(jié)構(gòu)和物相組成、電導(dǎo)率、電解試樣的表層形貌、電解質(zhì)和陰極鋁的雜質(zhì)增量等的分析檢測，研究Yb2O3摻雜對15(20Ni-Cu)/ NiFe2O4-10NiO金屬陶瓷致密度、導(dǎo)電率和耐腐蝕性能的影響。結(jié)果表明：1 300 ℃燒結(jié)的0.5%Yb2O3-15(20Ni-Cu)/ (NiFe2O4-10NiO) 金屬陶瓷具有較好的性能，相對密度為98.53%，960 ℃時(shí)的電導(dǎo)率為53.06 S/cm，電解腐蝕后金屬腐蝕層厚度為20~30 µm，總雜質(zhì)增量為0.079 g。
關(guān)鍵字: 金屬陶瓷；Yb2O3；摻雜；惰性陽極；鋁電解
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
