耐事故燃料组件用PVD高熵合金涂层研究进展

Research progress of PVD high-entropy alloy coatings for Accident Tolerance Fuel

摘要:

由于其较高的表面硬度、更好的耐腐蚀性能，尤其是抗辐照性能优越，高熵合金涂层可被用于耐事故燃料组件的表面防护。物理气相沉积技术能够在不损伤基体力学性能的前提下制备出结构致密、界面结合强度高的涂层材料，是理想的燃料组件表面高熵合金涂层制备技术。本文综述了近年来面向耐事故燃料组件用PVD高熵合金金属及陶瓷涂层的研究进展，从耐事故高熵合金涂层的服役工况、成分设计、性能分析、涂层失效机制等方面分析了现有PVD高熵合金涂层体系性能及潜在的问题，提出应从工况条件下的涂层腐蚀劣化机制、结构组元设计、工程化PVD制备工艺等方面完善耐事故用PVD高熵合金涂层的研究，以期获得满足ATF应用的高熵合金涂层。

Abstract:

The high entropy alloy metal coatings can be considered as the accident tolerance fuel (ATF) technologies due to their higher surface hardness, better corrosion resistance, especially superior radiation resistance. Physical vapor deposition (PVD) is an ideal technology for preparing high entropy alloy coatings on fuel assembly surface. The coatings synthesized by PVD have compact structure and high interfacial bonding strength without damaging the mechanical properties of substrate. This paper is an overview of PVD high entropy alloy coatings for ATF in recent years. The performance and potential problems of the existing PVD high entropy alloy coatings system are analyzed from the aspects of fuel assemblies’ service condition, coating’s composition design, performance analysis and failure mechanism. It is put forward that the research of PVD high entropy alloy coating for ATF should be carried out from the degradation mechanism analysis of coating under accident condition, structural component design and engineering PVD process technology, so as to obtain a high entropy alloy coating suit for ATF.