项目名称: 基于原位反应的事故容错型锆合金包壳表面SiC/ZrC1-x梯度陶瓷改性研究
项目编号: No.51502322
项目类型: 青年科学基金项目
立项/批准年度: 2016
项目学科: 一般工业技术
项目作者: 薛佳祥
作者单位: 中国科学院上海硅酸盐研究所
项目金额: 20万元
中文摘要: 事故容错燃料要求包壳在超高温、强腐蚀、强辐照的事故环境下依然保持高性能,现阶段的最佳方案是对锆合金进行表面陶瓷化改性。SiC作为最被认可的反应堆结构材料之一,具有优异的耐高温、耐腐蚀、抗辐照性能。本项目以ZrC1-x作为SiC与锆合金之间的过渡层,避免了SiC和Zr基体的热匹配问题和界面反应问题。利用ZrC的非化学计量特性,采用原位反应实现对锆合金表面的SiC/ZrC1-x梯度改性。在SiC/SiC-ZrC1-x/ZrC1-x/Zr材料制备的基础上,对材料的微观结构进行调控,分析其常规力学和热学性能,考察其耐热循环性能,重点研究材料在高压过热水汽中的腐蚀、吸氢行为,以及在离子辐照下辐照缺陷的演化规律,对其腐蚀、损伤机理进行分析,提出改善思路。本项目的开展有望在一定程度上为我国设计、制备事故容错性强的锆合金包壳提供基础的实验数据和理论指导,具有重要的科研价值和潜在应用价值。
中文关键词: 事故容错燃料;表面陶瓷化;原位反应;辐照损伤;水汽腐蚀
英文摘要: Accident tolerant fuel requires cladding to remain high performance under accident with ultra-high temperature, strong corrosion and strong irradiation. The best solution at this stage is surface modification of zircaloy with ceramics. As one of the most recognized reactor structural materials, SiC has excellent high temperature resistance, corrosion resistance, anti-irradiation performance. This project us ZrC1-x as a transition layer between SiC and zircaloy, avoiding thermal mismatching and interfacial reaction of SiC and Zr matrix. Using the non-stoichiometric characteristics of ZrC, achieve the graded modification of zircaloy surface via in-situ reaction. On the basis of the modification of zircaloy surface with graded composite ceramics, SiC/SiC-ZrC1-x/ZrC1-x/Zr, tailor the microstructure, analyze the mechanical and thermal properties, exam the heat cycle performance, study steam corrosion at high pressure and hydrogen absorption behavior of materials, evaluate the evolution of microstructure and radiation defects, analyze damage mechanism and propose improvement ideas. This study will provide the valuable experimental basis and theoretical guidance for designing and fabricating of zircaloy cladding with high accident tolerance property, which has important scientific value and potential applications.
英文关键词: Accident tolerant fuel (ATF);surface modification with ceramics;in-situ reaction;irradiation damage;vapor corrosion