Fabrication, Structural Characterization and Uniaxial Tensile Properties of Novel Sintered Multi-Layer Wire Mesh Porous Plates

Abstract

There is an increasing interest in developing porous metals or metallic foams for functional and structural applications. The study of the physical and mechanical properties of porous metals is very important and helpful for their application. In this paper, a novel sintered multilayer wire mesh porous plate material (WMPPs) with a thickness of 0.5 mm–3 mm and a porosity of 10–35% was prepared by winding, pressing, rolling, and subsequently vacuum sintering them. The pore size and total size distribution in the as-prepared samples were investigated using the bubble point method. The uniaxial tensile behavior of the WMPPs was investigated in terms of the sintering temperature, porosity, wire diameter, and manufacturing technology. The deformation process and the failure mechanism under the tensile press was also discussed based on the appearance of the fractures (SEM figures). The results indicated that the pore size and total size distribution were closely related to the raw material used and the sintering temperature. For the WMPPs prepared by the wire mesh, the pore structures were inerratic and the vast majority of pore size was less than 10 μm. On the other hand, for the WMPPs that were prepared by wire mesh and powder, the pore structures were irregular and the pore size ranged from 0 μm–50 μm. The experimental data showed that the tensile strength of WMPPs is much higher than any other porous metals or metallic foams. Higher sintering temperatures led to coarser joints between wires and resulted in higher tensile strength. The sintering temperature decreased from 1330 °C to 1130 °C and the tensile strength decreased from 296 MPa to 164 MPa. Lower porosity means that there are more metallurgical joints and metallic frameworks resisting deformation per unit volume. Therefore, lower porosities exhibit higher tensile strength. An increase of porosity from 17.14% to 32.5% led to the decrease of the tensile strength by 90 MPa. The coarser wires led to a bigger contact area between the interconnecting wires, resulting in a stronger sintering neck that exhibited higher tensile strength. The wire diameter increased from 81 μm to 122 μm and the tensile strength increased from 296 MPa to 362 MPa. The fracture morphology showed that the wires experience necking deformation and ductile fracture.

Production and Anisotropic Tensile Properties of Stainless Steel Wire Mesh/ZA8 Alloy Composites Produced by Squeeze Casting

“…In the first step, the 304 stainless steel wire mesh was cut into strips. The microstructure of the stainless steel wire mesh with 80 μm wire diameter is shown in our previous work . The warp wires and weft wires were crisscrossed to form inerratic square pores.…”

Technical Experimental Equipment for Making Porous Wire Samples

“…The pressing of wire semiproducts does not usually provide permanent fixing of wire turns at their ends, particularly when elastic or rigid wire is used ( Figure 5,a). In addition, the lack of sintering operation, traditionally performed in metallurgic processes involving powder and fibrous products, gives no possibility to render extra strength to the product (Balshin, 1972;Liu et al, 2008;Duan et al, 2018). Therefore, the problem how to prevent damage to the packing ends, specifically unwinding of wire turns, can be solved by strengthening the turns at both ends, for example by using connecting tips.…”

Preparation and Tensile Properties of Novel Porous Plates Made by Stainless Steel Wire Mesh and Powder Composites

“…Porosity and pore structure also have great influence on the mechanical properties [ 5 ]; the tensile properties of metal porous materials are one of the indicators that cannot be ignored. Research on the tensile properties of porous materials has shown that the higher the porosity is, the lower will be the strength and stiffness [ 6 , 7 ]. The sintering temperature has an obvious effect on the tensile strength of the composite porous materials [ 7 , 8 ].…”