电磁场辅助粉末扩散-热处理法制备高硅硅钢薄带的机理研究

High Si steel especially 6.5wt%Si steel with excellent magnetic properties have attracted much attention. However, owing to the brittleness, it is difficult to use conventional rolling process to prepare high Si steel sheets, which has become the application bottleneck of constraining high Si steel sheets. It is a high efficient and green technology to promote the magnetic property of Si steel sheets by a new kind of high Si coating process, which combined the magnetic assistant powder diffusion technology and heat treatment. High Si coatings on a low Si sheet matrix will be designed and prepared in Fe-Si alloy powder by first. The influence of electromagnetic field on the process of powder diffusion and heat treatment will be examined. The possible migration behavior of Si and oriented texture effect will be investigated through the diffusion couple experiments and instrumental characterization. The determinant factors of soft magnetic performance will be analyzed based on the effects of powder system, magnetic field and heat treatment parameters. The successful realization of this project will provide a technological and theoretical prototype for the design and preparation of high Si steel sheets.

高硅特别是硅含量为6.5wt%的硅钢薄带的制备及其机理研究具有重要的价值。但由于高硅钢的脆性，很难采用常规的轧制工艺进行制备而成为制约高硅硅钢薄带应用的瓶颈。本项目拟设计、制备以低硅钢薄带为基体，以铁硅合金粉作为硅源采用粉末扩散法在低硅钢基体表面制得富硅层，利用电磁场辅助粉末扩散及热处理法实现富硅层与低硅基体材料的高效结合。研究电磁场对粉末扩散及热处理过程的影响规律。通过扩散偶实验以及微观结构的表征，探讨电磁场下硅元素的迁移行为，以及热处理过程中可能存在的织构效应；通过比较分析粉末体系、磁场参数、电场参数、热处理参数与硅钢薄带软磁性能之间的相关性，解析硅钢薄带磁性能的决定因素，为新型高硅硅钢薄带材料的设计、制备奠定基础。

高硅特别是硅含量为6.5wt%的硅钢薄带的制备及其机理研究具有重要的研究意义。但由于高硅钢的脆性，很难采用常规的轧制工艺进行制备而成为制约高硅硅钢薄带应用的瓶颈。本项目以硅含量为0.5wt%的低硅钢薄带为基体，以不同硅含量的铁-硅合金粉末作为硅源采用粉末扩散法在低硅钢基体表面制得富硅层，利用电磁场辅助粉末扩散及热处理法实现富硅层与低硅基体材料的高效结合。研究结果表明：采用质量比2:5:1:1:1的硅含量为10wt%Si、20wt%Si、50%Si铁硅合金粉与纯Si粉末、Al2O3粉末在1000℃粉末扩散20h后再经过均匀化热处理获得的硅钢镀层整体硅含量约等于6.5wt%，同时，磁场的施加虽然对Si元素的扩散具有一定的抑制作用，但是能促进硅钢薄带沿着(110)[001]方向择优取向，同时采用平行磁场下获得的硅钢薄带综合磁性能较好。采用磁场下粉末扩散及热处理技术工艺成功制备出硅含量约为6.5wt%Si的高硅硅钢薄带，这为工业化制备高硅硅钢薄带提供了新思路。