与高温气冷核反应堆耦合下的高温固体氧化物燃料电解池(SOEC)电解水蒸汽制氢是目前已知效率最高最先进的制氢技术之一,是有效利用核能的一种途径,因此是当前国际能源环保领域的热点课题和首选方案.此方法需要在高温下长期运行,且在系统开启和检修等运行环节中必然会遇到热循环和热疲劳,因此需要高性能的密封材料.选择Ba-Ca-Si-Al-B-La-O体系微晶玻璃作为研究对象,研究其制备和热处理析晶工艺.研究发现通过两步析晶法,获得了整体均匀析晶的微晶玻璃密封材料,在工作温度下热膨胀系数可达到11.5×10~(-6) K~(-1),可与电解质、连接体等材料形成热匹配.该材料的软化温度约为763 ℃,在SOEC堆的工作温度下可实现密封.
It is an advanced method for producing hydrogen by electrolyzing vapor at high temperature, especially using SOEC stacks coupling with HTR, which is also an effective way to use nuclear. The system will work at high temperature, 800～900 ℃, for long time. And the thermal cycles and thermal creep will happen for many times when the system open and prepared. Hence, sealing materials with excellent performances are needed. Glass-ceramics are good candidate materials. In this paper, glass-ceramics of Ba-Ca-Si-Al-B-La-O system were selected, and processing of preparation and heat treatment were studied. The glass-ceramics materials with homogenous crystallization were prepared by two-step Crystallizing Method. Its coefficient of thermal expansion (α) was 11.5×10~(-6) K~(-1) at work temperature of SOEC stacking, which indicated that the as-prepared sealants would be matched with electrolytes (ZrO_2) and interconnect (steel or alloy). In addition, the soft temperature (T_s) was 763 ℃, and it was suitable for sealing processing.
参考文献
| [1] | 朴金花,孙克宁,张乃庆,周德瑞,华军.固体氧化物燃料电池密封材料的研究进展[J].人工晶体学报,2004(06):909-912. |
| [2] | Sohn SB.;Choi SY.;Kim GH.;Song HS.;Kim GD. .Stable sealing glass for planar solid oxide fuel cell[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,2002(2/3):103-112. |
| [3] | Sohn S B;Choi S Y;Kim G H et al.[J].Journal of the American Ceramic Society,2004,87(02):254. |
| [4] | Fergus J W .[J].J Pow Sourc,2005,147:46. |
| [5] | Jiang S P;Christiansen L;Hughan B et al.[J].Journal of Materials Science Letters,2001,20(08):695. |
| [6] | Schwickert T;Sievering R;Gesee P et al.[J].Mat-wiss u Werkstoffiech,2002,33:363. |
| [7] | Ley K.L.;Knimpelt M. .Glass-ceramic sealants for solid oxide fuel cells: Part I. Physical properties[J].Journal of Materials Research,1996(6):1489-1493. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%