WC-12Co涂层对中子、γ射线的屏蔽特性及其结合强度的辐照效应  

Shielding Characteristic of WC-12Co Coating to Neutrons and Gamma Rays and Its Radiation Effect of Bonding Strength

作　　者：马晓军[1] 邱长军[1] 

机构地区：[1]南华大学机械工程学院,湖南衡阳421001

出　　处：《热加工工艺》2008年第9期78-80,共3页Hot Working Technology

摘　　要：采用常规氧-乙炔焰喷涂技术制备WC-12Co涂层,模拟计算了涂层对中子、γ射线的屏蔽特性。将试样分别置于5#固体镭γ源、Am-Be中子源接受100天辐照,测试辐照前后涂层的结合强度,EDS能谱分析了辐照前后涂层界面元素分布规律。结果表明,γ光子能量小于0.01MeV时,0.5～1mm厚的WC-12Co涂层可以屏蔽98%以上的射线。1mm厚的WC-12Co涂层可以屏蔽12%的热中子,快中子屏蔽效果欠佳。涂层经中子辐照后强度提高20%～50%,γ射线对涂层强度没有明显影响。中子辐照前后涂层界面元素无扩散现象。初步分析认为,中子辐照后涂层强度提高可能与材料屈服强度、抗拉强度的提高有关。WC-12Co coating were prepared, by conventionality oxygen-ecetylene sprayed. Shielding characteristic of WC-12Co coating to neutrons and gamma rays was calculated. The samples were radiated in gamma ray sources （Ra） and neutron sources （Am-Be） for 100 days. Bonding strength were tested and the element distribution regularity was analysised by means of EDS. The results show that WC-12Co coating （0.5 mm-1 mm） can shield 98% Gamma Rays （below 0.01 MeV ） and about 12% thermal neutrons. However, the shielding characteristic to fast neutrons is not very good. After radiation of fast neutrons, the bonding strength is increased by 50% while gamma ray has no evidence effect on bonding strength. Perhaps it is due to improvement of yield strength and tension strength of the material.

关 键 词：WC-12CO涂层 中子、γ射线 屏蔽特性 结合强度 

分 类 号：TG174.44[金属学及工艺—金属表面处理]