Diffusion bonding in fabrication of aluminum foam sandwich panels

Lin, Huakuan; Luo, Hongjie; Huang, Wenzhan; Xiao, Zhao; Yao, Guangchun

doi:10.1016/j.jmatprotec.2015.10.034

Cited by 51 publications

(23 citation statements)

References 22 publications

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“…The foamed product's mechanical and thermal stability is another crucial property in its application in various fields such as packaging, construction, automotive, etc. [95][96][97]. Therefore, it is highly essential to fabricate foams with reduced density and better stability in strong and rigid structures.…”

Section: Effect Of Reinforcing Agentsmentioning

confidence: 99%

Microwave Foaming of Materials: An Emerging Field

et al. 2020

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In the last two decades, the application of microwave heating to the processing of materials has to become increasingly widespread. Microwave-assisted foaming processes show promise for industrial commercialization due to the potential advantages that microwaves have shown compared to conventional methods. These include reducing process time, improved energy efficiency, solvent-free foaming, reduced processing steps, and improved product quality. However, the interaction of microwave energy with foaming materials, the effects of critical processing factors on microwave foaming behavior, and the foamed product’s final properties are still not well-explored. This article reviews the mechanism and principles of microwave foaming of different materials. The article critically evaluates the impact of influential foaming parameters such as blowing agent, viscosity, precursor properties, microwave conditions, additives, and filler on the interaction of microwave, foaming material, physical (expansion, cellular structure, and density), mechanical, and thermal properties of the resultant foamed product. Finally, the key challenges and opportunities for developing industrial microwave foaming processes are identified, and areas for potential future research works are highlighted.

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Section: Effect Of Reinforcing Agentsmentioning

confidence: 99%

Microwave Foaming of Materials: An Emerging Field

et al. 2020

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“…Aluminium foams belonging to the metal matrix syntactic foams (MMSFs) offer various advantages [10] for applications in different industrial sectors, such as automotive [11], aerospace [12], military, and chemical industries [13], due to excellent properties, such as energy absorption abilities, thermal insulation capabilities, and electromagnetic shielding effect [14], besides being a lightweight material. Metallic panels and tubes are used to fabricate aluminium foam sandwiches (AFS) [15] and foam-filled tube structures (FFTSs) [16]. Accordingly, the properties of aluminium foams related to bending [17] and impact resistance [18] have been significantly improved.…”

Section: Introductionmentioning

confidence: 99%

Influence of Porosity on the Mechanical Behavior during Uniaxial Compressive Testing on Voronoi-Based Open-Cell Aluminium Foam

et al. 2019

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We have studied an application of the Voronoi tessellation method in the modeling of open-cell aluminium foam under uniaxial compressive loading. The Voronoi code was merged with computer-aided design (CAD) for converting the polyhedral model into an irregular open-cell cellular structure to create porous samples for compression testing simulations. Numerical simulations of the uniaxial compression uniformly over the upper surface of the sample in the z-axis direction at a constant 20 N load was realised. Samples with three different porosities (30%, 60% and 80%) were studied. A nonlinear elasto-plastic material model with perfect plasticity, without hardening, based on the von Mises yield criterion was applied below 10% strain. Corresponding stress–strain curves were observed and the influence of porosity on deformation mechanism was discussed. Samples with higher porosity exhibited significantly higher normal stress under the same load, and increased stress plateaus. An increase of porosity produced an increase of both compressive and tensile stresses and struts exhibited complex stress fields. Voronoi-based modeling was in accordance with experimental results in the literature in the case of the quasi-static condition and linear elastic region (below 1% strain). Further study is necessary to enable the simulation of real dynamic behaviour under all deformation regimes by using the Voronoi tessellation method.

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“…Thus, more attempts have been made to explore new processes based on PM method. The mainly compound mechanism for AFS prepared by PM was thermal diffusion [15]. Specifically, after closely fitted with each other of densified core powders and metal panel outside by high pressure through machine equipment, a certain bonding strength was gained for the interface.…”

Section: Introductionmentioning

confidence: 99%

“…Bonding strength between panel and powder core layer as well as densification of core powders have constituted the most critical prerequisites for manufacturing AFS. Lin et al [15] prepared a the precursor of AFS at the pressure of 8 MPa for 8 min at a temperature of 490 °C by hot pressing. The maximum expansion rate of nearly 400% for powder core layer was acquired, characterized by high quality metallurgical bonding between the panel and the foam core layer.…”

Section: Introductionmentioning

confidence: 99%

Densification Mechanism for the Precursor of AFS under Different Rolling Temperatures

et al. 2019

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The effect of rolling temperature on the precursor of aluminum foam sandwich (AFS) prepared by powder metallurgy through Pack Rolling method is investigated in this work. The cross-section along rolling direction of the precursors was observed. It was found that periodic corrugated morphology with micro-cracks on the composite interface as well as cracks and micro-holes among core powder particles emerged abundantly at room temperature rolling. These defects degraded with increasing rolling temperature and completely disappeared when the rolling temperature reached 400 °C. Combining with foaming ability of these precursors, the densification mechanism of core powders was discussed. Powder particles deformed with difficulty at low rolling temperature; the gap between them cannot be effectively filled through their plastic deformation. Fracture occurred in powder core layer during co-extension with the outer panel and was partly embedded by it, resulting in corrugated composite morphology at the interface. The precursors of high density and excellent bonding interface were prepared at the rolling temperature of 400 °C. A more suitable foaming condition was determined.

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Diffusion bonding in fabrication of aluminum foam sandwich panels

Cited by 51 publications

References 22 publications

Microwave Foaming of Materials: An Emerging Field

Microwave Foaming of Materials: An Emerging Field

Influence of Porosity on the Mechanical Behavior during Uniaxial Compressive Testing on Voronoi-Based Open-Cell Aluminium Foam

Densification Mechanism for the Precursor of AFS under Different Rolling Temperatures

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