中温固体氧化物燃料电池金属连接极抗氧化涂层材料的研究
文献类型：学位论文
| 作者 | 陶玲 |
| 学位类别 | 硕士 |
| 答辩日期 | 2007-06-08 |
| 授予单位 | 中国科学院过程工程研究所 |
| 授予地点 | 过程工程研究所 |
| 导师 | 朱庆山 |
| 关键词 | 固体氧化物燃料电池 金属连接极 涂层材料 YCo0.6Mn0.4O3 |
| 其他题名 | Study on Anti-oxidation Coating Material for Metallic Interconnects of Solid Oxide Fuel Cells |
| 学位专业 | 化学工程 |
| 中文摘要 | 固体氧化物燃料电池（SOFC）具有能量转换效率高、环境友好和燃料适应性广等优点，是举世公认的高效绿色能源转换技术。金属连接极因其较高的电子电导率、廉价易加工等优点已广泛应用于中温固体氧化物燃料电池中，然而在操作温度下金属连接极易发生氧化和Cr挥发等问题，严重影响了电池堆性能。 本文以开发新型抗氧化涂层材料为重点，从结构稳定性、热膨胀性能、导电性能等多方面考虑出发，探索了金属Ag、尖晶石及钙钛矿类氧化物等新型涂层材料。通过涂层材料的选择、结构设计、制备和优化，以及通过粉体制备工艺及涂覆工艺的优化，获得具有高性能的抗氧化涂层材料。取得了如下的研究结果： 开发了YCo0.6Mn0.4O3新型抗氧化涂层材料，该材料具有与SS 410合金匹配的热膨胀系数、较高的电导率、较稳定的相结构、与常用的阴极粉体锰酸镧锶（LSM）及铁钴锶镧（LSCF）具有较好的化学相容性等优点。通过柠檬酸合成法制备了YCo0.6Mn0.4O3粉体，并对粉体的制备工艺进行了优化研究。采用丝网印刷-干压联用技术在SS 410合金上涂覆YCo0.6Mn0.4O3保护涂层材料，采用氧化增重法、SEM/EDX、四探针法分别对SS 410合金及其涂覆抗氧化涂层后的高温氧化速率、微观形貌、Cr的挥发性和面积比电阻(Area Specific Resistance, ASR)进行了研究。结果表明，通过丝网印刷法-干压联用技术可在合金表面制备出连续、致密的抗氧化涂层，且涂层在循环氧化过程中与合金基底结合牢固，没有出现剥离脱落现象。涂覆YCo0.6Mn0.4O3涂层后，在800 °C下SS 410合金的氧化速率（kg）降低了1个数量级，其面积比电阻（ASR）由未涂层的92 mΩ•cm2降到了20 mΩ•cm2 以下，极大地提高了合金的高温抗氧化性能及电导性能。 |
| 英文摘要 | Solid oxide fuel cell (SOFC) is an electrochemical device that converts the energy of a fuel directly into electricity in an efficient, environmental benign and fuel flexible way. With the excellent electrical, cost-effective and mechanical properties, iron-base alloys are considered as one of the most promising candidate materials for intermediate temperature solid oxide fuel cell interconnects. However, poorly conducting chromium oxide, ferric oxide and Cr-Mn spinel scales formed on the surface of the alloy due to high temperature oxidation lead to rapid degradation of fuel cell performance. The purpose of the present study is to develop a novel anti-oxidation coating material for the metallic interconnects. Various materials, including silver, spinel oxides, perovskite oxides, etc., has been screened to investigate their potential as oxidation-resistant coating materials for the interconnects. Consequently, a novel coating material-YCo0.6Mn0.4O3 has been successfully developed. The main points are as follows: Owing to the high electrical conductivity, an appropriate thermal expansion behavior, high structural stability in the oxidizing cathode environment and the chemical compatibility with the LSM and LSCF cathodes, YCo0.6Mn0.4O3 has been developed and characterized as a novel oxidation resistant coating material for SS 410 alloy. The YCo0.6Mn0.4O3 was synthesized through citric synthesis process, and dense YCo0.6Mn0.4O3 coatings were fabricated on SS 410 alloy by screen-printing coupled with dry pressing. The SS 410 alloys with and without the dense YCo0.6Mn0.4O3 coating were subjected to oxidation tests. The microstructure, mass gains and electrical conductivities of the coated and uncoated samples after oxidation have been investigated. Results revealed that a uniform and dense YCo0.6Mn0.4O3 coating can be formed on the surface of the SS 410 and the coating bonded well to the alloy substrate after thermal cycling tests owing to well matched thermal expansion coefficient between the coating material and the alloy. The parabolic rate constant (kg) of the coated alloy was measured to be one-order of magnitude lower than that of the uncoated alloy after the oxidation test at 800°C. The YCo0.6Mn0.4O3-coated alloy obviously showed a lower area specific resistance (ASR) of less than 20 mΩ•cm2 as compared with the value of 92 mΩ•cm2 for the bare-alloy under the same oxidation condition. |
| 语种 | 中文 |
| 公开日期 | 2013-09-13 |
| 页码 | 76 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1168]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 陶玲. 中温固体氧化物燃料电池金属连接极抗氧化涂层材料的研究[D]. 过程工程研究所. 中国科学院过程工程研究所. 2007. |
入库方式： OAI收割
来源：过程工程研究所
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