To improve the oxide scale of property and electrically conductive at elevated temperatures via screen printing by LSNC for SOFC metallic interconnect
| Autor: | Wei-Jhih Li, 李偉誌 |
|---|---|
| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 Conductive oxide coatings are used to improve electrical performance and surface stability of metallic interconnects, as well as to mitigate or prevent chromium poisoning in solid oxide fuel cells. To further understand materials suitability and shed light on mass transport, Coating layer (La0.9Sr0.1Co0.4Ni0.6O3-δ LSNC) were taken as examples and applied as dense coatings via sreen printing on three stainless steels: AISI430, Crofer22 APU, and SUS304. Oxidation, electrical, and microstructural investigations indicated the perovskite coatings improved both surface stability and electrical performance of the stainless steel substrates. This study reports show, the optimum conditions for slurries used in the wet spray coating were determined by the measurement of slurry viscosity and coated surface morphology. The electrical conductivities of the coated substrates were measured by using a DC two-point and four-wire method under air atmosphere at 800℃. Of note, the coated Crofer22APU substrate treated at 800℃ in N2 with 5 vol.% H2 showed long-term stability and a lower ASR value than other samples. After an 600hr oxidation experiment the coated Crofer22APU substrate, the ASR showed a low value of 9 mΩcm2. The thickness of the coated layer was about 10-20μm. The thickness of the coated conductive oxide layer was about 10–20 mm. These results show that a coated oxide layer mitigate the formation and the growth of scale and enhances the longterm stability and electrical performance of metallic interconnects for SOFCs. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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