Effect of AlF₃ Addition on Electric Conductivity of NiFe₂O₄-Based Cermet Inert Anode

Abstract:

In this study, a combination of a two-step sintering and a particle size gradation technique was used to prepare cermet samples. We focused on the impact of the AlF₃ additive on the performance of the cermet. We found that the addition of AlF₃ doesnt significantly improve the density and porosity of Ag-NiFe₂O₄, since the addition of the AlF₃ did not reduce the particle size, nor did it promote the tight packing of NiFe₂O₄ in a spinel-based cermet. However, we did observe a significant enhancement in its conductivity. The sample with 3% additive has the highest conductivity at 22.53S·cm^-1 at 900°C, nearly 3.8 times better than the pure sample. An Analysis of the cermet microstructure showed that adding AlF₃ can improve wetting between the ceramic phase and the silver metallic phase. It also facilitates the distribution of silver along the contour of the ceramic particles, which contributes to the improved conductivity of the nickel-based cermet.

• Periodical: Advanced Materials Research (Volumes 881-883)
• Pages: 1391-1395
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.881-883.1391
• Online since: January 2014
• Authors: Fu Xiang Wei*, Gen Xi Yu, Zhi Ling Wang
• Keywords: AlF₃ Addition, Conductivity, Metal Ceramics, Microstructure

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