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During the past decade, high-current pulsed electron beams (HCPEB), initially developed at the Tomsk Institute of High Current Electronics, have attracted much attention in the field of materials surface modifications. Under the action of HCPEB a high energy (10–10 W/cm) is deposited only in a very thin layer (less than tens of micrometers) within a short time (a few microseconds) and causes superfast heating and cooling on the irradiated surface of material. Unfortunately, craters are inevitably formed on the irradiated surface when metals and alloys are irradiated by HCPEB, which are believed to deteriorate the mechanical reliability in structural materials and limit the applications of this new technique. However, this technique may become a new method for porous materials preparation by controlling HCPEB process parameter and choosing appropriate materials. Porous materials have been industrialized into permeable application such as gas filter, separation membranes, and catalyst supports. For such applications, a high porosity with a well-controlled pore size distribution is required. On the other hand, porous materials with a tailored microstructure have potentials to be used as structural components due to unique properties such as good strain and damage tolerance, and good thermal shock resistance. In practice, some performance based on size, shape, and polarity is difficult to achieve using polymeric porous materials. Additionally, the thermal and chemical stability of organic materials is often limited. In contrast, metal porous materials can provide unprecedented selectivity and stability. In this note, we provide an initial assessment of the feasibility of good dispersions of micropores on the surface of AISI 304 austenitic stainless steel by HCPEB treatment. The initial experiments were performed on a small laboratory scale.

Fabrication of Micropore on AISI 304L Austenitic Stainless Steel Surface by High-current Pulsed Electron Beams Irradiation