Preparation of Cast Metallic Foams with Irregular and Regular Inner Structure

Kroupová, Ivana; Gawronová, Martina; Lichý, Petr; Merta, Václav; Radkovský, Filip; Janovská, Kamila; Nguyenová, Isabel; Beňo, Jaroslav; Obzina, Tomáš; Vasková, Iveta; Lana, I. G. Dalla; Rygel, Jiří

doi:10.3390/ma14226989

Cited by 9 publications

(6 citation statements)

References 36 publications

(43 reference statements)

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“…However, instead of salt particles, precursors made from conventional core mixture are used in this process. In the framework of previous experiments [53], many materials for precursors have been verified, e.g., material based on Al2O3•SiO2, shards of cores (Croning technology, SAND TEAM, spol. s r.o., Holubice, Czech Republic), and furan no-bake mixtures (Eurotek Foundry Products Ltd, Elland, West Yorkshire, UK) (Figure 2).…”

Section: Methodsmentioning

confidence: 88%

“…The problem with these precursors was the material from which they were made (ceramics), creating an irregular shape (Croning technology, furan no-bake mixture). Based on these experiments, it was determined that the furan no-bake core mixture is a suitable material for precursor In the framework of previous experiments [53], many materials for precursors have been verified, e.g., material based on Al 2 O 3 •SiO 2 , shards of cores (Croning technology, SAND TEAM, spol. s r.o., Holubice, Czech Republic), and furan no-bake mixtures (Eurotek Foundry Products Ltd., Elland, West Yorkshire, UK) (Figure 2).…”

Section: Methodsmentioning

confidence: 94%

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Use of Molding Mixtures for the Production of Cast Porous Metals

Kroupová

Gawronová

Lichý

et al. 2022

Metals

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This paper aims to present the possibility of producing cast porous metals (or metallic foams) in a low-tech way by the use of conventional foundry technologies, i.e., the common procedures and materials. Due to the technological and economic complexity of the production processes of cast metallic foams, research into this material currently focuses on the development of less demanding technologies. The introduction of such production processes may help to exploit the full application potential of metallic foams. Within the framework of our proposed procedure, molding and core mixtures are used for the production of molds and filler material (space holder), also called precursors. It is the shape, size, and relative position of the individual precursors that determines the shape of the internal structure of the resulting metallic foam. The core mixture for the production of precursors is evaluated in terms of changes in properties with respect to storage time. Attention is focused on one of the most common bonding systems, furan no-bake. Casting tests are carried out for the possibility of making cast porous metals from aluminum alloy with different shapes of internal cavities depending on the different shapes of the filler material. The collapsibility of the cores after casting is evaluated for the test castings. The results show that even using commonly available materials and processes, cast metallic foams with complex internal structures can be produced.

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Section: Methodsmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 94%

Use of Molding Mixtures for the Production of Cast Porous Metals

Kroupová

Gawronová

Lichý

et al. 2022

Metals

Self Cite

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“…Moreover, investigation of PM lattice structures shows a low wetting for granola particles which will decrease the mechanical properties. [ 28–32 ] However, the Cu lattice structure produced in this study is homogenous and without microporosity due to the nature of massive solidification in the investment casting process that is better than the SLM and the PM Cu lattices in terms of mechanical properties. Controllability, low cost, and the fact that this method is better known make the investment casting a good production route for these novel Cu lattice structures.…”

Section: Introductionmentioning

confidence: 94%

Experimental and Simulation Investigation on Energy Absorption of Cu Casting Lattice Structure during Compression

2023

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This investigation aims to assess the mechanical behavior and energy absorption properties of the Cu lattice structures made by investment casting method experimentally and by finite element method (FEM) simulation. The casting pattern of lattice structures is additively manufactured with 2.0, 2.5, and 3.0 mm diameters and the lattice structures produced by investment casting of Cu. Then a uniaxial compression test is applied to measure maximum compressive strength, energy absorption density, efficiency, and specific energy absorption. The simulation and the experimental results indicate that the abovementioned properties of the lattice structures have a significant improvement and properties developments will rise by increasing the diameter of the struts. The mechanical characterization has done for Cu lattice structure with 3.0 mm strut diameter, which endures a stress of 242 MPa at the densification strain and the maximum tolerated stress of 404 MPa. The energy absorption density of this lattice structure is 67 MJ m−3 and has a specific energy absorption of 28 J g−1 followed by an energy absorption efficiency around 70%. The simulation result shows a mathematical connection between the unit cells and the final lattice structures in terms of maximum tolerated stresses, which can help the prediction of the mechanical behavior of these structures.

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“…In previous experiments [18], several materials and processes for precursor production have been evaluated (see Figure 3). Based on the findings of these experiments, it was assessed that the focus should be on the production of precursors of the same shape from core mixtures showing great collapsibility after casting (furan no-bake).…”

Section: Infiltration Of the Molten Metal Into Mould Cavity Filled Wi...mentioning

confidence: 99%

Production of filling material of the mould for manufacturing of metallic foams with irregular inner structure

Kroupová

Gawronová

2022

METAL 2022 Conference Proeedings

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The article presents the technology of manufacturing of precursors (special kind of filling mould material) for possibility to create a complex internal structure of the metallic foam casting. Due to the purpose for which the precursors are used, they must meet specific criteria. The material of the precursors must be sufficiently refractory to come into contact with the liquid metal, and the individual particles must also resist the movement of the melt within the mould. At the same time, however, in the context of this metal foam technology, it is essential that the precursors exhibit excellent collapsibility after casting -i.e. that they are easily removable from the resulting complex casting. Therefore, one of the conventionally used core mixtures appears to be the ideal material for the production of precursors. In this paper, the technology for the production of spherical precursors from a furan self-hardening mixture is described and verified. The motivation for the choice of material and all the sub-steps of the process -moulding into the core, tumbling, including the necessary accompanying tests of the mechanical properties of the core mixture being verified -are described.

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Preparation of Cast Metallic Foams with Irregular and Regular Inner Structure

Cited by 9 publications

References 36 publications

Use of Molding Mixtures for the Production of Cast Porous Metals

Use of Molding Mixtures for the Production of Cast Porous Metals

Experimental and Simulation Investigation on Energy Absorption of Cu Casting Lattice Structure during Compression

Production of filling material of the mould for manufacturing of metallic foams with irregular inner structure

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