(河北理工大學(xué) 冶金與能源學(xué)院，唐山 063009)
摘 要: 在KCl-NaCl-NaF-(SiO2)熔鹽體系中，以含硅3%(質(zhì)量分?jǐn)?shù))的硅鋼為陰極，石墨為陽極，將電沉積硅和在硅鋼基體上滲硅同時(shí)進(jìn)行，制備了Fe-Si梯度層，并對梯度層的特性進(jìn)行了分析。結(jié)果表明：梯度層中硅含量呈3種不同的變化規(guī)律，在靠近試樣表面的部分，硅含量沿深度下降率較大；在梯度層中間部分，硅含量基本保持不變；在梯度層靠近基體一側(cè)，硅含量的下降率介于前兩者之間；梯度層中，以Fe3Si、FeSi、Fe5Si3和Fe構(gòu)成的厚度占整個(gè)梯度層厚度的比率最大；梯度層沿基體一側(cè)向表面的物質(zhì)組成變化規(guī)律為 Fe3Si+FeSi+Fe→Fe3Si+FeSi+Fe5Si3+Fe→FeSi，且各物質(zhì)的量隨硅含量的變化而變化；溫度對梯度層中各物質(zhì)含量的變化規(guī)律影響不大。
關(guān)鍵字: Fe-Si梯度材料；梯度層特性；物質(zhì)組成
（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
