45钢直流电场快速粉末渗硅

Direct Current Field- Assisted Rapid Powder Siliconizing of Plain Carbon Steel

为了弥补常规粉末渗硅工艺的缺陷,探索施加直流电场加速粉末渗硅的可行性,在45钢和渗剂之间施加合适参数的直流电场,实现快速粉末渗硅,并分析了渗硅层显微组织、厚度及相组成。结果表明:直流电场可显著提高渗速,使渗硅温度降低到750℃,渗硅时间缩短至2 h;直流电场条件下获得的渗硅层主要为Fe5Si3相。

The feasibility to exert direct current field so as to accelerate powder siliconizing and get rid of the disadvantages of conventional powder siliconizing was explored.Thus a direct current of properly selected parameters was applied between 45 steel and the permeation agent to realize accelerated powder siliconizing.The thickness of the siliconizing coating was determined,and its microstructure and phase composition were analyzed by metallographic microscopy and X-ray diffraction.It was found that applying direct current field helped to significantly accelerate powder siliconizing of the carbon steel and reduce the siliconizing temperature and time to 750℃ and 2 h,respectively;and as-obtained siliconizing coating mainly consisted of Fe_5Si_3.