CAJ | 학술논문

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.
여고온기랭핵반응퇴우합하적고온고체양화물연료전해지(SOEC)전해수증기제경시목전이지효솔최고최선진적제경기술지일,시유효이용핵능적일충도경,인차시당전국제능원배보영역적열점과제화수선방안.차방법수요재고온하장기운행,차재계통개계화검수등운행배절중필연회우도열순배화열피로,인차수요고성능적밀봉재료.선택Ba-Ca-Si-Al-B-La-O체계미정파리작위연구대상,연구기제비화열처리석정공예.연구발현통과량보석정법,획득료정체균균석정적미정파리밀봉재료,재공작온도하열팽창계수가체도11.5×10~(-6) K~(-1),가여전해질、련접체등재료형성열필배.해재료적연화온도약위763 ℃,재SOEC퇴적공작온도하가실현밀봉.
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.