Manufacturing of Cast Metal Foams with Irregular Cell Structure

Kroupová, Ivana; Radkovský, Filip; Lichý, Petr; Bednářová, Vlasta

doi:10.1515/afe-2015-0038

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…To avoid problems with penetration of molten metal into the mould, increasing of thickness of the polymer foam struts is necessary. It was reported that thickening could be realized by covering of the pattern with wax or spraying it with acrylic paint [2,20]. In the present research, the authors pursue the novel concept of thickening of the polyurethane template: with the use of a mixture of carbonaceous substances and binders.…”

Section: Thickening Of the Patternmentioning

confidence: 96%

Archives of Metallurgy and Materials

Stręk¹,

Lipowska²,

Wańczyk³

2019

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The present article describes selected aspects of investment casting technology for manufacturing of open-cell aluminium. The main focus is, among others, on the precursor thickening. Two groups of total 30 samples were produced, basing on opencell polyurethane foam used as the precursor. Each of the two sample groups was thickened with a different type of suspension consisting of carbonaceous substances and organic binders. The influence of the coating mixture type was compared, leading to conclusions regarding the desired composition and fluidity of the suspensions. Both sample groups of the obtained open-cell aluminium had stochastic cell distributions, the average pore diameter was 5.2 mm and the PPI index was 8. The apparent densities were respectively: 0.485 g/cm 3 and 0.312 g/cm 3 , which reflected the impact of the precursor coating. Additionally, samples from both groups differed in quality.

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Section: Thickening Of the Patternmentioning

confidence: 96%

Archives of Metallurgy and Materials

Stręk¹,

Lipowska²,

Wańczyk³

2019

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“…A precursor must be made of a material that preserves its shape at the impact of molten metal (having sufficient strength, low abrasion, refractoriness) and it must also allow a good disintegration after the casting. 6 The key step in this technology is a perfect removal of all the precursors from the casting volume, which is problematic due to the complex cavity of a casting. This is why our experiment focused on water-soluble materials for the precursors.…”

Section: Principle Of the Technologymentioning

confidence: 99%

Use of water-soluble precursors in the production of cast metal foams

Kroupová¹,

Lichý²,

Lana³

2020

Mater. Tehnol.

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The paper is devoted to the field of manufacturing cast metallic foams-porous metal materials-with a stochastic arrangement of the inner cavities. The mastering of inexpensive ways of manufacturing metallic foams is a prerequisite for a full utilization of such a material. That is why the experimental part was devoted to the casting technologies for the production of metal foams based on conventional foundry processes. In the experiment, the infiltration of molten metal into mould cavities filled with precursors was tested. Particular attention was paid to the use of water-soluble precursor materials. It is assumed that a thorough knowledge of the production parameters and conditions will contribute to the expansion of the foundry range, which can also increase the competitiveness of this industry on a global scale.

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“…pore size which allows the production of filters with different filtration efficiencies for use in the production of a wide portfolio of different types of castings. It is used in the heating industry for the filtration of gases and liquids [11].…”

Section: Metal Sponge Used For Filtrationmentioning

confidence: 99%

Archives of Foundry Engineering

Radkovský,

Merta,

Obzina

2020

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The article describes the design of a proven technology for the production of metal foam and porous metal by the foundry. Porous metal formed by infiltrating liquid metal into a mould cavity appears to be the fastest and most economical method. However, even here we cannot do without the right production parameters. Based on the research, the production process was optimised and subsequently a functional sample of metal foam with an irregular internal structure -a filter -was produced. The copper alloy filter was cast into a gypsum mould using an evaporable model. Furthermore, a functional sample of porous metal with a regular internal structure was produced -a heat exchanger. The aluminium alloy heat exchanger was cast into a green sand mould using preforms. Also, a porous metal casting with a regular internal structure was formed for use as an element in deformation zones. This aluminium alloy casting was made by the Lost Foam method. The aim is therefore to ensure the production of healthy castings, which would find use in the field of filtration of liquid metal or flue gases, in vehicles in the field of shock energy absorption and also in energy as a heat exchanger.

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Manufacturing of Cast Metal Foams with Irregular Cell Structure

Cited by 4 publications

References 4 publications

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

Use of water-soluble precursors in the production of cast metal foams

Archives of Foundry Engineering

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