采用真空感应炉制备316L-50Mn初始合金,然后通过真空环境下Mn升华去合金制备多孔不锈钢,应用SEM、EDS和XRD等对物理真空去合金工艺方法制备的多孔不锈钢进行分析,并研究去合金过程中温度以及时间对孔的形成、发展以及孔的形貌的影响。结果表明,物理真空去合金工艺可以制备多孔不锈钢,其孔隙率为30%~60%,孔径为0.5~3 μm,多孔层深度达到15~60 μm。真空热处理温度和时间是物理真空去合金制备方法的2个关键因素,处理温度主要通过影响Mn元素挥发和体扩散速率进而影响孔的形貌,而处理时间对多孔层的深度起到主要作用。
More and more attentions have been paid to porous stainless steel, as the 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 heat treatment in vacuum environment in this experiment. SEM, EDS and 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 0.5~3 μm pore size, and the 15~60 μm 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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