Air permeability and tensile properties of novel micron-scale gradient porous plates fabricated by rolling and vacuum sintering

A new type of gradient porous plate (GPP) was successfully fabricated by rolling and vacuum sintering using powders and wire mesh porous plates (WMPPs). The air permeability and tensile strength tests were carried out and the fracture morphology was observed. The results showed that the GPPs with low porosity not only had micron-pore structure with the pore size below 10 μm, and air permeability reached 1.27 × 10−13 m2, but also hold tensile strength with 257.8 MPa. Particularly, its air permeability and tensile strength were significantly superior to nuclear graphite, stainless steel foam, and porous alumina ceramics, equivalent to porous titanium. This study provides an effective method for the fabrication of micron-scale metal GPPs, and is of great significance for expanding the application range (especially in the fields of micron-scale precision filtration and the porous throttles of the aerostatic bearing) of porous materials.