Thermal conductivity of closed-cell aluminum foam based on the 3D geometrical reconstruction

Zhu, Xiaolei; Ai, Shigang; Lu, Xiaofeng; Ling, Xiang; Zhu, Lingxue; Liu, Bin

doi:10.1016/j.ijheatmasstransfer.2014.01.006

Cited by 34 publications

(23 citation statements)

References 24 publications

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“…In face-centered cubic structure, interplanar distance d is determined by the lattice constant a and crystal face indices (h k l), their relation is given in Eq. [5].…”

Section: B the Role Of Ball Milling Treatmentmentioning

confidence: 99%

“…[4] and [5] that a / d / 1=sinh, so a decreases with the increase of h. According to titanium hydride's crystal structure, [34] a is influenced by the amount of hydrogen atoms on the tetrahedral sites, the decrease of a means less hydrogen atoms on the tetrahedral sites. That is to say, the increase of h is caused by the decrease of hydrogen atoms in titanium hydride.…”

Section: B the Role Of Ball Milling Treatmentmentioning

confidence: 99%

“…[1][2][3][4][5][6] These excellent properties allow aluminum foams to be used in many application fields. [7][8][9] Among various manufacturing methods, melt foaming method is one of the most widely used one.…”

Section: Introductionmentioning

confidence: 99%

“…[17][18][19][20] In these studies, an essential requirement to obtain foams with a pore size of around 1 mm is that the foaming time must be short and the melt should be solidified before the pores growing large. However, due to the low thermal conductivity of aluminum foams, [5] it is very difficult to realize rapid solidification of the entire foam at the same time. If the solidification process starts before the foaming process is completed, the difference in solidification time of outer and inner areas can be very big (especially for large foam blocks).…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Aluminum Foams with Small Pore Size by Melt Foaming Method

Cheng

Chen

et al. 2017

Metall Mater Trans B

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This article introduces an improvement to the fabrication of aluminum foams with small pore size by melt foaming method. Before added to the melt, the foaming agent (titanium hydride) was pretreated in two steps. It firstly went through the traditional pre-oxidation treatment, which delayed the decomposition of titanium hydride and made sure the dispersion stage was controllable. Then such pre-oxidized titanium hydride powder was mixed with copper powder in a planetary ball mill. This treatment can not only increase the number of foaming agent particles and make them easier to disperse in the melt, which helps to increase the number of pores, but also reduce the amount of hydrogen released in the foaming stage. Therefore, the pore size could be decreased. Using such a ball-milled foaming agent in melt foaming method, aluminum foams with small pore size (average size of 1.6 mm) were successfully fabricated.

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“…In face-centered cubic structure, interplanar distance d is determined by the lattice constant a and crystal face indices (h k l), their relation is given in Eq. [5].…”

Section: B the Role Of Ball Milling Treatmentmentioning

confidence: 99%

Section: B the Role Of Ball Milling Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fabrication of Aluminum Foams with Small Pore Size by Melt Foaming Method

Cheng

Chen

et al. 2017

Metall Mater Trans B

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“…The strain rate-dependent compression response of Ni-foam was determined by the finite element method based on µCT images in [48]. A novel reconstruction method with Matlab image processing and CT scanning was applied and the finite element method was used to determine the thermal conductivity and the material response of a closed-cell aluminium foam in [49] and [50].…”

Section: Introductionmentioning

confidence: 99%

Compressive Response Determination of Closed-Cell Aluminium Foam and Linear-Elastic Finite Element Simulation of μCT-Based Directly Reconstructed Geometrical Models

2018

SV-JME

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Metal foams have a lightweight cellular structure with excellent mechanical and physical properties. It is well known that metal foams have high compression strength combined with good energy absorption characteristics [1]. Therefore, the interest in these materials is widespread not only as a vibration damper or sound absorber but also as a load-bearing structural element. Numerous applications rely on the compressive property of metal foams, which directly depend on its structure. As a load-bearing structural element (e.g. vehicle part, biomedical implant) metal foam is expected to behave elastically under working circumstances, so the material response must be predicted precisely in the elastic region. Numerical determination of compressive properties of foam structure remains a demanding engineering task, and it is indispensable for design purposes.A number of studies have reported on measuring the material response of different types of metal foams in destructive ways. Geometrical modelling is an essential part of the procedure aiming the investigation of metal foam structures in a numerical way. Numerous approaches can be found in the literature for the proper description of foam structures, one of which is the usage of uniform cell models which results in simplified geometry compared with the actual structure. A combination of spherical and cruciform-shaped cells was used to model closed-cell aluminium foam and to simulate its material response in [11], while different uniform cell structures were applied to the model and simulate open cell metal foams in [12] to [14]. Diamond and cubic cell foam structure were also used to simulate the effect of cell shape on the mechanical behaviour of open cell metal foams in [15].Since the inner structure of different types of metal foams is quite complicated, a surface analysis can result in imperfect or false data. Recent studies proved X-ray computed tomography to be an efficient and powerful tool for mapping the complete structure • Calculations based on geometrical model precisely described the compressive response in the elastic region. Compressive Response Determination of Closed-Cell Aluminium Foam and Linear-Elastic Finite Element Simulation of µCT-Based Directly Reconstructed Geometrical Models

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