材料期刊网，材料期刊，材料类期刊，材料期刊投稿

燃料元件是核反应堆的核心部件,其性能指标直接影响反应堆的安全性和经济性.目前轻水反应堆中存在的锆合金腐蚀、吸氢、芯-壳反应等问题以及第四代核能系统燃料元件对材料的特殊要求,使以碳化硅(SiC)为包壳或基体材料的新型燃料元件的概念设计和制备成为了核燃料元件领域的一个新的热点.基于目前的研究进展,综述了SiC及SiC基复合材料在轻水反应堆、高温气冷堆、熔盐堆以及气冷快堆中的应用.重点阐述以SiC为包壳或基体材料的不同堆型燃料元件的设计理念、结构形式、制备方法及相关性能表现,并在此基础上总结了堆用SiC材料的特性和共性问题,展望了SiC材料在核燃料元件中的应用前景和重要发展方向.

关键词: 碳化硅 , 燃料元件 , 包壳材料 , 基体材料

THE INTERFACE OF TERNARY-BORIDE-BASED HARD CLADDING MATERIAL

Y.G. Wang , Z.Q. Li , D. Zhang

金属学报(英文版)

The interfacial microstructure of ternary-boride-based hard cladding material (YF- 2) has been studied using scanning electron microanalyser (SEM), X-ray diffraction (XRD) and energy disperse spectroscopy (EDS). Results show that there are chemical reactions and elements diffusion in the interfacial zone, which make the interface bonding well and bonding strength ideal at the interface. The results gotten by studying of crack produced by Vickers indentation technique in the interfacial zone show that it is diffcult to produce crack in the interface, the crack length in the cladding layer is longer than that to the interface, the crack which propagate to the interface stops at the interface rather than propagates along the interface. This suggests negligible residual stresses have developed because of thermal expansion mismatch. The bonding strength of the interface is 550MPa, which has been gotten by cutting test. The result gotten by analyzing the fracture surface shows that the fracture occurs at the side of cladding layer, which conrms that the bonding strength at the interface is higher than that in the cladding layer.

关键词: ternary boride , null , null