CoO掺杂对15(20Ni-Cu)/(NiO-NiFe_2O_4)金属陶瓷导电性能的影响  

Effect of CoO doping on electrical conductivity of 15(20Ni-Cu)/(NiO-NiFe_2O_4) based cermets

作　　者：吴海明[1] 李志友[1] 甘雪萍[1] 周科朝[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2011年第2期206-211,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划资助项目(2005CB623703);国家自然科学基金资助项目(50474051)

摘　　要：在15(20Ni-Cu)/(NiO-NiFe2O4)金属陶瓷中掺杂CoO,制备15(20Ni-Cu)/[10(xCoO-yNiO)-90NiFe2O4]金属陶瓷,研究CoO掺杂量x对15(20Ni-Cu)/(NiO-NiFe2O4)金属陶瓷材料的烧结致密化、物相组成以及电导率的影响。结果表明:当CoO掺杂量x为0～10%时,烧结样品中主要含有NiO、NiFe2O4、CuNi固溶体三相,Co2+离子嵌入到NiO-NiFe2O4陶瓷基体中取代部分Ni2+,形成NixCo1?xFe2O4和NiyCo1?yO相。CoO掺杂能提高该金属陶瓷的烧结致密度和电导率,1 300℃烧结掺杂10%CoO样品的致密度和960℃高温电导率分别高达97.77%和53.04 S/cm,而未掺杂样品的致密度和高温电导率分别为97.13%和43.35 S/cm,掺杂CoO可使15(20Ni-Cu)/(NiO-NiFe2O4)金属陶瓷的高温电导率提高22%。15（20Ni-Cu）/[10（xCoO-yNiO）-90NiFe2O4] based cermets were prepared by doping with CoO,the effects of CoO contents on the densification,phase composition,microstructure and electrical conductivity of 15（20Ni-Cu）/（NiO-NiFe2O4） based cermets were studied.The results show that the sample is mainly consisted of NiO,NiFe2O4 and CuNi when content of CoO is in the range of 0%～10%（mass fraction） and Co2＋ ions embed in NiO-NiFe2O4 ceramic matrix,replacing a portion of Ni2＋ to form NixCo1-xFe2O4 and NiyCo1-y O phase.The maximum relative density of the sample doped with 10% CoO reaches 97.77% when sintered at 1 300 ℃,which is higher than that of the undoped one of 97.13%.When sintered at 1 300 ℃,the sample doped with 10% CoO has the maximum electrical conductivity（53.04 S/cm） at 960 ℃,which increases by 22% compared with that of the undoped sample（43.35 S/cm）.

关 键 词：10NiO-NiFe2O4基金属陶瓷 CoO掺杂 惰性阳极 电导率 

分 类 号：TF125.42[冶金工程—粉末冶金]