SGER: Toughening Mechanisms of SiC/SiC Composites through SiC Nanowires

SGER：SiC/SiC 复合材料通过 SiC 纳米线的增韧机制

• 批准号: 0739576
• 负责人: Hanchen Huang
• 金额: --
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-15 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0739576&HistoricalAwards=false
• 关键词: SGER; Toughening; Mechanisms; SiC; Composites

Recent experiments have shown that fracture resistance or toughness of certain high-temperature ceramic SiC/SiC composites may be substantially elevated by incorporation of very thin ceramic fibers or nanowires into the matrix. Properties of the nanowire-matrix interface control crack bridging and fiber pullout, which are recognized as sources of the elevated toughness. To describe and explain this response, the project focuses on atomistic simulations of the deformation mechanisms at both internal core-shell interfaces and at interfaces of the nanowires with the matrix. Optimization of the interface composition is expected to provide guidelines for design of nanowire-based ceramic composites for strength, dimensional stability, and fracture and irradiation resistance in applications to nuclear reactors.Societal benefits include both technology advancement and graduate education. The results will enable the development of toughened composites for applications at extreme temperatures, intense radiation and corrosion. Involvement of a graduate student will contribute to manpower needs in the revival of the nuclear industry.

最近的实验表明，某些高温陶瓷SiC/SiC复合材料的抗断裂性或韧性可以通过将非常薄的陶瓷纤维或纳米线结合到基质中而显著提高。 纤维-基体界面的性质控制裂纹桥接和纤维拔出，这被认为是提高韧性的来源。 为了描述和解释这种反应，该项目的重点是原子模拟的变形机制在内部核壳界面和界面的纳米线与矩阵。 界面组成的优化有望为设计具有强度、尺寸稳定性、抗断裂性和抗辐照性的刚玉基陶瓷复合材料提供指导，并在核反应堆中应用，社会效益包括技术进步和研究生教育。 研究结果将使增韧复合材料的开发能够应用于极端温度，强烈辐射和腐蚀。 研究生的参与将有助于核工业复兴的人力需求。