【摘要】 为了改善金属相对陶瓷相的润湿,充分发挥金属相的作用,在合成Ag质量分数为10%的Ag/NiFe2O4金属陶瓷过程中加入质量分数为10%的SnO2(与NiFe2O4形成复合陶瓷基体)和0~5%CuO(作为添加剂).采用粉末冶金法制备复合氧化物基的金属陶瓷惰性阳极,原料经混料、成型后在1 200℃下烧结6 h,制备成铝电解用惰性阳极.研究了CuO对金属陶瓷微观结构以及性能的影响.结果表明:在加入SnO2的基础上,掺杂添加剂CuO可以改善Ag与陶瓷相的润湿性,Ag分布均匀且部分由球状变为长条状,同时试样的电导率有了大幅度提高.适量的CuO还可以促进烧结,提高试样的致密度.当CuO质量分数为4%时试样的性能最好.更多还原

【Abstract】 In order to improve the wettability between metallic phase Ag and ceramics phase,the 10%SnO2(as ceramics matrix) and 0%~5%CuO(as additive) were added into raw materials-powders of NiO and Fe2O3 in the process of synthesizing Ag/NiFe2O4+SnO2 cermets containing 10%Ag.The raw materialswere mixed,then molded and sintered at 1 200 ℃ for 6 h.The effect of CuO on microstructure and properties of cermets was studied.The results show that when the additive CuOwas added,most metal phase is strip due to the improved wettability between metallic phase Ag and ceramics phase.At the same time,the conductivity of the samples is improved remarkably.The proper content of CuO could increase the density of samples because CuO could promote sintering.When the mass percent of CuO is 4%,the property of sample is the best.更多还原