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在1Cr18Ni9Ti型不锈钢基体表面,采用等离子喷涂技术制备Fe-Ni-B(Fe70Ni27B3,wt%)屏蔽涂层。采用X射线衍射(XRD)、扫描电子显微镜(SEM)及能谱仪(EDX)对涂层的微观结构、物相组成及元素分布进行了研究,并对涂层的屏蔽效果进行了测试。结果表明,Fe-Ni-B屏蔽涂层呈均匀的层片状累积结构,具有屏蔽功能的含硼相主要为Fe2B,另外还含有(Fe,Ni)相和少量的Fe7B相。从Fe-Ni-B涂层表面到基体方向,硬度较大的硼化物浓度逐渐降低,相应的硬度也随之减小。Fe-Ni-B涂层能明显提高不锈钢基材的热中子吸收率。
Fe-Ni-B (Fe70Ni27B3, wt%) shielding coating was prepared on the surface of 1Cr18Ni9Ti stainless steel substrate by plasma spray technique. The microstructure, phase composition and elemental distribution of the coatings were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDX). The shielding effectiveness of the coatings was also tested. The results show that the Fe-Ni-B shielding coating has a uniform lamellar cumulative structure. The boron-containing phase with shielding function is mainly Fe2B, and contains (Fe, Ni) phase and a small amount of Fe7B phase. From the surface of Fe-Ni-B coating to the substrate direction, the hardness of the boride gradually decreases and the corresponding hardness decreases. Fe-Ni-B coating can significantly improve the thermal neutron absorption rate of stainless steel substrate.