复合添加剂对金属陶瓷惰性阳极导电性的影响

为了改善金属相对陶瓷相的润湿,充分发挥金属相的作用,在合成含10%Ag的Ag/NiFe2O4金属陶瓷过程中引入添加剂TiO2和V2O5,采用粉末冶金法制备Ag/NiFe2O4金属陶瓷惰性阳极.原料NiO,Fe2O3,Ag和微量TiO2,V2O5经混料、成型后在1 250℃下烧结6 h.研究了添加剂TiO2,V2O5对Ag/NiFe2O4金属陶瓷微观形貌以及对试样电导率的影响.研究结果表明,复合添加TiO2,V2O5后金属银在陶瓷相中呈线状分布,EDX分析发现金属相中含有陶瓷相的组成,说明金属相与陶瓷相间的润湿性有所改善;同时试样的电导率有了显著提高.当添加0.5%TiO2,2.0%V2O5时试...

Effect of Complex Additive on Conductivity of Cermet Inert Anodes

To improve the wettability of metallic phase Ag for ceramics so as to make full use of the metallic phase, the additives TiO2 and V2O5 were added to NiO and Fe2O3 powders as raw material in the synthesizing process of Ag/NiFe2O4 cermet containing 10% Ag. The NiO and Fe2O3 powders, Ag and the traces of TiO2 and V2O5 were mixed, then molded and sintered at 1250°C for 6 hr. The effects of TiO2 and V2O5 on the micromorphology and electric conductivity of the cermet were studied. The results showed that when adding TiO2 and V2O5, the metal phase Ag is distributed linearly. EDX analysis showed that there is ceramic phase in the metal phase. The facts show that the complex additives TiO2-V2O5 can improve the wettability between the metallic phase Ag and ceramics with the electric conductivity of samples improved remarkably. It was revealed that when the adding amounts of TiO2 and V2O5 are 0.5% and 2.0% respectively, the conductivity of the sample is 8 times as large as that of the sample without TiO2 and V2O5 additives.