(河北理工大学 冶金与能源学院，唐山 063009)
摘 要: 在KCl-NaCl-NaF-(SiO2)熔盐体系中，以含硅3%(质量分数)的硅钢为阴极，石墨为阳极，将电沉积硅和在硅钢基体上渗硅同时进行，制备了Fe-Si梯度层，并对梯度层的特性进行了分析。结果表明：梯度层中硅含量呈3种不同的变化规律，在靠近试样表面的部分，硅含量沿深度下降率较大；在梯度层中间部分，硅含量基本保持不变；在梯度层靠近基体一侧，硅含量的下降率介于前两者之间；梯度层中，以Fe3Si、FeSi、Fe5Si3和Fe构成的厚度占整个梯度层厚度的比率最大；梯度层沿基体一侧向表面的物质组成变化规律为 Fe3Si+FeSi+Fe→Fe3Si+FeSi+Fe5Si3+Fe→FeSi，且各物质的量随硅含量的变化而变化；温度对梯度层中各物质含量的变化规律影响不大。
关键字: Fe-Si梯度材料；梯度层特性；物质组成
（School of Metallurgy and Energy, Hebei Polytechnic University, Tangshan 063009, China）
Abstract: In KCl-NaCl-NaF-(SiO2) system, by using 3%Si (mass fraction) silicon sheet as cathode and graphite as anode, Fe-Si gradient layer was prepared on silicon sheet surface by eletrodeposition and siliconizing on silicon sheet at the same time. The character of the gradient layer was analyzed. The results show that the silicon contents in the gradient layer appear three kinds of changing rules. The silicon content declines rapidly along the depth toward the gradient layer surface. The silicon content is almost invariable in the middle section of gradient layer. While in the section near the base body, the declining rate of silicon content is slow comparatively. The gradient layer made up of Fe3Si, FeSi, Fe5Si3 and Fe is thicker than that of others. The changing rule of the gradient layer substance composition along the base body to the gradient layer surface is Fe3Si+FeSi+Fe→Fe3Si+FeSi+Fe5Si3+Fe→FeSi, and the content of each substance changes with the silicon content. The influence of temperature on the content rate of each substance is not obvious.
Key words: Fe-Si gradient material; gradient layer character; substance composition
