Investigation of a Template-Based Process Chain for Investment Casting of Open-Cell Metal Foams
About: This article is published in Advanced Engineering Materials.The article was published on 2021-08-21 and is currently open access. It has received 2 citations till now. The article focuses on the topics: Investment casting.
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01 Feb 2022
TL;DR: In this article , a process is presented for the production of periodic cellular structures based on investment casting of Al-12 wt%Si alloy within a mould that is made of table salt (NaCl) packed around a sacrificial PLA polymer template.
Abstract: A process is presented for the production of periodic cellular structures based on investment casting of Al-12 wt%Si alloy within a mould that is made of table salt (NaCl) packed around a sacrificial PLA polymer template. Moulding begins by pouring salt grains suspended within brine and packed by vibration around the pattern. This is followed by draining, drying, and pyrolysis of the polymer followed by pressure infiltration of the resulting mould with molten metal. Cast Al-12 %Si structures made of octahedra linked at their vertexes (6 in all three directions) with a relative density of 31% are produced and characterized for their microstructure and compressive deformation. The highly porous structures replicate accurately the polymer pattern in dense metal, have a compressive modulus of 1.2 GPa, a plateau stress of 20 MPa, a densification strain of 77%, and an energy absorption of 15 J/cm3 corresponding to an efficiency of 80% compared to an ideally plastic material.
2 citations
TL;DR: In this paper , the authors used in situ and spatial scaffolding methods to construct Al-Al3Zr composites with a density of 1.46 g/cm3 and an energy absorption capacity of 11.68 MJ/m3.
Abstract: Porous 2024Al-Al3Zr composites were prepared by in situ and spatial scaffolding methods. As the Al3Zr content increased from 5 wt.% to 30 wt.%, the binding of the powder in the pore wall increased and the defects in the composites decreased. The yield strength of the composites reached 28.11 MPa and the energy absorption capacity was 11.68 MJ/m3 at a Zr content of 20 wt.%, when the composites had the best compression and energy absorption performance. As the space scaffold content increased from 50% to 70%, the porosity of the composites then increased from 53.51% to 70.70%, but the apparent density gradually decreased from 1.46 g/cm3 to 0.92 g/cm3, leading to a gradual decrease in their compressive properties. In addition, by analysing the compression fracture morphology, the increase of Al3Zr will reduce the stress concentration and hinder the crack growth, while too much Al3Zr will lead to brittleness and reduce the performance.
References
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TL;DR: In this paper, a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) is presented.
Abstract: Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These
9,929 citations
"Investigation of a Template-Based P..." refers background in this paper
...show that even within the same base material and structure, a high variation of the stresses can occur.([16]) The driving factor here is the microstructural condition of the foam’s material, which can range in terms of Al-base materials from as-cast up to artificially or naturally aged....
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Book•
01 Aug 1988TL;DR: The linear elasticity of anisotropic cellular solids is studied in this article. But the authors focus on the design of sandwich panels with foam cores and do not consider the properties of the materials.
Abstract: 1. Introduction 2. The structure of cellular solids 3. Material properties 4. The mechanics of honeycombs 5. The mechanics of foams: basic results 6. The mechanics of foams refinements 7. Thermal, electrical and acoustic properties of foams 8. Energy absorption in cellular materials 9. The design of sandwich panels with foam cores 10. Wood 11. Cancellous bone 12. Cork 13. Sources, suppliers and property data Appendix: the linear-elasticity of anisotropic cellular solids.
8,946 citations
TL;DR: The possibilities for manufacturing metal foams or other porous metallic structures are reviewed in this article, where various manufacturing processes are classified according to the state of matter in which the metal is processed, such as solid, liquid, gaseous or ionised.
3,294 citations
TL;DR: This work presents a new mesoporous composite material suitable for high-performance liquid chromatography and shows good chiral recognition ability and high uniformity in various racemates.
Abstract: Dingcai Wu,*,† Fei Xu,† Bin Sun,† Ruowen Fu,† Hongkun He,‡ and Krzysztof Matyjaszewski*,‡ †Materials Science Institute, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China ‡Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States
1,455 citations
TL;DR: This paper summarizes a little of the way in which the mechanical properties of cellular solids are analysed and illustrates the range of properties offered by alternative configurations.
Abstract: Man and nature both exploit the remarkable properties of cellular solids, by which we mean foams, meshes and microlattices. To the non-scientist, their image is that of soft, compliant, things: cushions, packaging and padding. To the food scientist they are familiar as bread, cake and desserts of the best kind: meringue, mousse and sponge. To those who study nature they are the structural materials of their subject: wood, coral, cancellous bone. And to the engineer they are of vast importance in building lightweight structures, for energy management, for thermal insulation, filtration and much more. When a solid is converted into a material with a foam-like structure, the single-valued properties of the solid are extended. By properties we mean stiffness, strength, thermal conductivity and diffusivity, electrical resistivity and so forth. And the extension is vast-the properties can be changed by a factor of 1000 or more. Perhaps the most important concept in analysing the mechanical behaviour is that of the distinction between a stretch- and a bending-dominated structure. The first is exceptionally stiff and strong for a given mass; the second is compliant and, although not strong, it absorbs energy well when compressed. This paper summarizes a little of the way in which the mechanical properties of cellular solids are analysed and illustrates the range of properties offered by alternative configurations.
1,140 citations