不锈钢丝网多孔材料的孔隙特征及渗透性能分析

Analysis of Pore Characteristics and Permeability of Sintered Stainless Steel Wire Mesh Porous Material

采用304不锈钢丝网为原材料,经过卷绕、压制、轧制、真空烧结工艺,制备了不锈钢丝网多孔板,利用扫描电镜观察板材形貌,分析了金属间的连接及孔隙的形成,获得了不锈钢丝网多孔材料的孔隙大小、孔隙分布及孔隙率。以改进的达西定律为依据,设计了一套检测多孔板渗透性能的装置,利用粘性渗透系数和惯性渗透系数作为多孔板的空气渗透性能指标,评价了不锈钢丝网多孔材料的渗透性能,确定了孔隙率对不锈钢丝网多孔材料渗透性能的影响规律。研究表明,不锈钢丝网多孔板孔隙分布均匀,金属骨架连续,孔隙大约在0~60μm之间,孔隙率在20%~40%之间,其渗透性能和孔隙率、厚度有着密切的关系,孔隙率越大、厚度越小,其气体渗透性能越好。

Using 304 stainless steel wire mesh as raw material, the sintered stainless steel wire mesh porous plate was prepared by winding, pressing, rolling and vacuum sintering. The surface picture of the plate was obtained by scanning electron microscopy(SEM). The formation process of the interface and the pore was analyzed, and the pore size, pore distribution and porosity of the stainless steel wire mesh porous material were obtained. Based on the improved Darcy’s law, a device for testing the permeability of the porous plate was designed. The viscous permeability coefficient and the inertial permeability coefficient were used as the air permeability index of the porous plate to evaluate the permeability of the stainless steel wire mesh porous material. Then the influence of porosity on the permeability of the stainless steel wire mesh porous material was determined. The study result shows that the plate has uniform pore distribution and continuous metal skeleton, with a pore diameter of 0~60 μm and a porosity of 20%~40%. The study also indicates a close relationship between permeability and porosity as well as thickness, which means the permeability of porous material increases with the increase of the porosity and the decrease of the thickness.