| Autor: |
Chun-Liang Chang, Chang-sing Hwang, Chun-Huang Tsai, Sheng-Fu Yang, Wei-Ja Shong, Zong-Yang Jhuang-Shie, Te-Jung Daron Huang |
| Předmět: |
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| Zdroj: |
Ceramic Engineering & Science Proceedings; 2015, Vol. 36 Issue 3, p45-55, 11p |
| Abstrakt: |
The chromium-contained ferritic stainless steels are widely employed as metallic interconnectors in intermediated temperature solid oxide fuel cells. However, the chromium content of these steels would cause obvious degradation phenomena due to the chromium-poisoning of cathode and oxidation of interconnector. Therefore, many coating techniques were adopted tofabricate a protective layer onto the surface of metallic interconnectors in order to decrease the growth chromium oxide and evaporation of chromium trioxide and chromium hydroxide. Among these techniques, atmospheric plasma spraying (APS) process is considered as a promising candidate due to its high deposition rate, flexibility and low cost. In this study, LSM (La0.8Sr0.2MnO3-δ) coatings were coated onto Crofer 22 H, Crofer 22 APU and SS441 via APS process. X-ray diffraction analysis was adopted to identify the crystal structures of the obtained LSM coatings. The morphology and cross-sectional observations of the coatings on interconnectors were characterized by scanning electron microscopy equipped with energy dispersive spectrometer. The ASR values of the coated interconnectors were measured by a four-probe dc technique at 800°C in air. The obtained LSM layers reveal relatively dense microstructure and high purity of crystallography phase due to the employed process parameters. After about 4,932 hours ageing at 800oC in air, the initial and final area specific resistance (ASR) values of the coated Crofer 22 APU sample with pre-oxidation treatment are 1.91 and 5.13 m cm2, respectively. The smallest increasing rate of ASR in this study is only about 0.65 μΩcm2/hr. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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