物理真空去合金法制備微米級多孔不銹鋼物理真空去合金法制備微米級多孔不銹鋼PREPARATION OF MICRO POROUS STAINLESS STEEL BY PHYSICAL VACUUM DEALLOYING 采用真空感應爐制備316L-50Mn初始合金，然后通過真空環境下Mn升華去合金制備多孔不銹鋼，應用SEM、EDS和XRD等對物理真空去合金工藝方法制備的多孔不銹鋼進行分析，并研究去合金過程中溫度以及時間對孔的形成、發展以及孔的形貌的影響。結果表明，物理真空去合金工藝可以制備多孔不銹鋼，其孔隙率為30%~60%，孔徑為0.5~3 μm，多孔層深度達到15~55 μm。真空熱處理溫度和時間是物理真空去合金制備方法的2個關鍵因素，處理溫度主要通過影響Mn元素揮發和體擴散速率進而影響孔的形貌，而處理時間對多孔層的深度起到主要作用。 More and more attentions have been paid to porous stainless steel, as its’ excellent performance in the physical, chemical and mechanical properties, in the field of solid oxide fuel cell, medical drug for implantable devices and so on. In this work, a new method called physical vacuum dealloying has been applied to produce porous stainless steel. Firstly, 316L-50Mn initial alloy was successfully melted by vacuum induction furnace, then the porous stainless steel was developed by 316L-50Mn after a heat treatment in vacuum environment in this experiment. Scanning Electron Microscope (SEM), Energy Dispersive Spectrometer (EDS) and X-ray diffraction (XRD) were used to analyze the porous stainless steel made by physical vacuum dealloying method. Meanwhile, the effects of temperature and time on the formation, development and morphology of pores during the dealloying process were also studied. The results show that it was effective to produce porous stainless steel by physical vacuum dealloying method. The porosity of micro pores in porous stainless steel is 30~60%, with 0.5~3μm pore size, and the 15~55μm thickness. The temperature mainly affects the hole formation and development by influencing the evaporation and bulk diffusion rate of Mn element, and time plays a major role in the thickness of the porous layer in the process of preparing porous stainless steel.
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