Porosity, microstructure and mechanical behavior of NiO–YSZ composite anode for solid oxide fuel cells
| Autor: | Nasrollah Najibi Ilkhechi, Ehsan Javanshir, Mohammad Tanhaei, Mahdi Mozammel |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Scanning electron microscope 020209 energy Composite number Metals and Alloys Pellets Sintering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 0202 electrical engineering electronic engineering information engineering Materials Chemistry Cubic zirconia Physical and Theoretical Chemistry Composite material 0210 nano-technology Porosity Yttria-stabilized zirconia |
| Zdroj: | International Journal of Materials Research. 108:857-863 |
| ISSN: | 2195-8556 1862-5282 |
| DOI: | 10.3139/146.111544 |
| Popis: | In this study, NiO–yttria stabilized zirconia (YSZ) composite anodes were prepared by using ball-milling followed by a sintering process. For this purpose, two different weight percent ratios of NiO and YSZ powders (50 : 50 and 60 : 40) were mixed by the cost-effective ball-milling method. The morphology and particle size distribution of the mixed powders were investigated using scanning electron microscopy and dynamic light scattering methods, respectively. The powders were then uniaxially pressed to form pellets with a thickness and diameter of around 1 and 22 mm, respectively. Sintering of the pellets was conducted at 1 100 °C and the microstructure and porosity, as well as phase analysis of bulk composites, were then investigated using scanning electron microscopy and X-ray diffraction, respectively. More importantly, the microhardnesses of the prepared pellets were obtained and compared with literature values to evaluate the accuracy of the sintering process. The results showed that the open porosity of the samples varied between 30 to 40 percent, which makes them suitable for anode application in solid oxide fuel cells. The prepared NiO–YSZ composites with a uniform distribution of Ni particles showed a value of microhardness above 0.5 GPa, and these results were discussed in detail. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|