Magnesium Matrix Composite with Open-Celled Glassy Carbon Foam Obtained Using the Infiltration Method

Abstract

In this study, we present a new composite material that was developed using the pressure infiltration method. In this composite, carbon reinforcement in the form of an open-celled rectangular foam (C of ) was applied, and pure magnesium with two commercial magnesium cast alloys (AZ31, RZ5) was used as the matrix. We examined the microstructure (LM, SEM + EDS) of composites as well as the density, porosity, hardness, compressive strength, flexural strength and tribological properties in dry conditions. It was revealed that the chemical composition of the matrix had a significant impact on the macrostructure, microstructure and properties of the composite. The matrix with rare elements (RZ5) induced poor infiltration of C of and physicochemical degradation of the reinforcement, while pure magnesium ensured good infiltration, a stable friction coefficient and low wear. For the AZ31 alloy, the effects of infiltration were good; however, an increase in the tribological properties was not observed. Compared with the as-cast matrix materials, the presence of carbon foam in both pure Mg and AZ31 alloy induced an increase in compressive strength and stiffness as well as a decrease in flexural strength. Furthermore, SEM examination of the fractured and wear surfaces microstructure showed structural effects' dependence on the matrix composition.

Decision Support System in the Field of Defects Assessment in the Metal Matrix Composites Castings

“…The layout of the table is similar to that in the Polish Standard [ 64 ]. It presents the qualification of a defect into the appropriate subgroup of defects in the structure of metal composite castings, as is described; the scheme is supported by an example of the defect, the causes of defects in the structure of metal composite castings are presented based on the studies [ 1 , 2 , 3 , 28 , 32 , 33 , 47 ] and their detection methods in accordance with studies of the authors [ 1 , 39 , 40 , 41 , 42 , 43 , 44 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 ] is proposed. Table 3 presents a proposal for the division of defects in castings made from traditional materials (cast steel, cast iron, non-ferrous alloys) and composite materials compatible with standard PN-85/H-83105 [ 67 ].…”

Effect of Carbon Fillers on the Wear Resistance of PA6 Thermoplastic Composites

“…As a raw polyamide material (PA6), Tarnamid T-30 (Grupa Azoty S.A., Tarnów, Poland) was used in the form of granules. In previous works [ 24 , 25 , 26 ], we discovered that glassy carbon has a beneficial influence at metal and epoxy matrix composites, however no research in thermoplastic composites has been performed. To assess usage of glassy carbon as tribology improvement filler, it was compared with much cheaper biocarbon and with nanomaterial (graphene oxide), that should have the best influence.…”

Application of Nanosilicon to the Sintering of Mg-Mg2Si Interpenetrating Phases Composite

“…The primary problem for all systems (i.e., ceramic–ceramic, metal–metal, and ceramic–metal) using these methods is the proper selection of sintering conditions to ensure low porosity and strong bonding between powder grains. Open-celled foam or other open-network substrates have been filled by liquid metal using pressure infiltration [ 39 , 40 , 41 , 42 , 43 ] and centrifugal casting [ 44 ] or by the vibro-compaction of metal powder-foam systems and additional sintering under pressure [ 45 ]. The main technological challenges for these technologies are ensuring strong bonding between components and low composite porosity.…”