EAGER: Self-Repairable Glass-Ceramic Composites for Solid Oxide Fuel Cells

EAGER：用于固体氧化物燃料电池的自修复玻璃陶瓷复合材料

• 批准号: 1147812
• 负责人: Raj Singh
• 金额: $ 9.26万
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2012-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1147812&HistoricalAwards=false
• 关键词: EAGER; Self; Repairable; Glass; Ceramic

NON-TECHNICAL DESCRIPTION: Glasses are used for sealing and joining materials in a myriad of technological applications such as vacuum technology, microelectronics and power electronics. Seals are also needed for new and more efficient energy producing devices such as solid oxide fuel cells (SOFCs) for conservation of limited natural resources for energy production. The seals for SOFCs function at very high temperatures and are susceptible to cracking in service. The research work is expected to develop a new class of glass and glass-composites that self-repair cracks or damage thereby providing long-life and cost-effective solutions to seals for SOFCs. The research also has potentials for enormous payoffs by (1) training students in invaluable technical and research skills applicable to both academia and industry, and (2) advance enhancing the institutional the resources of institution by the enhancement of existing facilities for the synthesis of glasses and glass-composites for high-technology applications. TECHNICAL DETAILS: While glasses are promising for making seals for SOFCs, they suffer from cracking because of their inherent brittleness when exposed to thermal transients. Recently, a transformative concept of self-healing/self-repairable glasses as seals for SOFCs was discovered, which requires a fundamental understanding of the kinetics and mechanism of crack healing in glasses and glass-ceramic composites. Therefore, the primary focus of this research is a basic investigation of the crack-healing mechanism and kinetics in promising glass and glass-ceramic composites displaying self-repair in order to further advance this transformative concept of self-repairable seals for SOFCs. With such an understanding one can identify the crack-healing mechanism and be able to predict the healing time required for achieving self-repair. The approach involves the synthesis of dense glass and glass-ceramic composites containing a crystalline ceramic phase, and studying the morphological evolution of cracks upon healing and crack-healing kinetics. The approach to this crack-healing study involves creating cracks of controlled geometry using a Vickers microindenter and then determining the crack-healing kinetics via measuring the crack shape and crack length as a function of time at different temperatures. The research is novel and transformative because the results will be the first comprehensive study of the crack-healing behaviors of glasses and glass-ceramic composites useful as active self-repairable seals for SOFCs.

非技术描述：玻璃用于在无数技术应用中的密封和连接材料，例如真空技术，微电子和电力电子产品。新的，更有效的能源产生设备（例如固体氧化物燃料电池（SOFC））也需要密封，以保护有限的自然资源以生产能源。 SOFC的密封在非常高的温度下功能，并且容易受到服务的破裂。预计研究工作将开发出新的玻璃和玻璃复合材料，这些玻璃和玻璃复合材料会自我修复或损坏，从而为SOFC的密封件提供长寿和成本效益的解决方案。这项研究还具有（1）培训学生的宝贵技术和研究技能的巨额回报的潜力，以及（2）通过增强现有设施的机构来增强机构的机构资源，以增强玻璃和玻璃 - 复合物用于高科技应用的合成。技术细节：虽然眼镜很有希望可以为SOFC制作密封，但由于暴露于热瞬变时，它们固有的脆性，因此遭受了破裂。最近，发现了一种自我修复/自我修复眼镜作为SOFC的密封件的变革性概念，这需要对玻璃和玻璃陶瓷复合材料中裂纹愈合的动力学和机制有基本的理解。因此，这项研究的主要重点是对有希望的玻璃和玻璃陶瓷复合材料中的裂纹机理和动力学的基本研究，这些玻璃和玻璃陶瓷复合材料表现出自我修复，以进一步推进SOFC的自我修复密封的这种变革性概念。有了这样的理解，人们可以识别裂纹机制，并能够预测实现自我修复所需的康复时间。该方法涉及含有结晶陶瓷相的密集玻璃和玻璃陶瓷复合材料的合成，并研究了愈合和裂缝动力学时裂纹的形态演变。这项裂缝治疗研究的方法涉及使用Vickers微型注册器创建受控几何形状的裂纹，然后通过测量裂纹形状和裂纹长度来确定裂纹 - 修复动力学，这是不同温度下时间的函数。这项研究是新颖和变革性的，因为结果将是对玻璃和玻璃陶瓷复合材料的裂纹行为的首次全面研究，可作为SOFC的主动自我修复密封。