Effect of additive V_2O_5 on sintering mechanism and properties of inert anodes of NiFe_2O_4 spinel

In order to improve the properties of inert anode of NiFe2O4 spinel, some additive V2O5 was added to raw materials-powders of NiO and Fe2O3. The powders of NiO, Fe2O3 were mixed with slight amount of V2O5, then they are moulded and sintered at 1200℃ for 6h.The sintering mechanism of powders of NiO and Fe2O3 with some additive V2O5 was researched. The effect of V2O5 on density, electrical conductivity and corrosion resistance of inert anode of NiFe2O4 spinel was studied at the same time. The results show that the sintering mechanism for powders of NiO and Fe2O3 with some additive V2O5 is liquid-phase sintering. Additive V2O5 can increase the density of the samples, especially it improves the corrosion resistance of the samples remarkably. When the amount of V2O5 is 1.5%, the sample’s corrosion rate is 1/80 of that of sample without V2O5. But the electrical conductivity of the samples with V2O5 is lower than that of the sample without V2O5.

In order to improve the properties of inert anode of NiFe2O4 spinel, some additive V2O5 was added to raw materials-powders of NiO and Fe2O3. The powders of NiO, Fe2O3 were mixed with slight amount of V2O3, then they are moulded and sintered at 1200℃ for 6h. The sintering mechanism of powders of NiO and Fe2O3 with some additive V2O3 was researched. The effect of V2O5 on density, electrical conductivity and corrosion resistance of inert anode of NiFe2O4 spinel was studied at the same time. The results show that the sintering mechanism for powders of NiO and Fe2O3 with some additive V2O5 is liquid-phase sintering. Additive V2O3 can increase the density of the samples, especially it improves the corrosion resistance of the samples remarkably. When the amount of V2O5 is 1.5%, the sample＇s corrosion rate is 1/80 of that of sample without V2O3. But the electrical conductivity of the samples with V2O5 is lower than that of the sample without V2O5.