The compaction and mechanical properties of agglomerated materials

Zwan, J. van der; Siskens, C. A. M.

doi:10.1016/0032-5910(82)85037-7

Cited by 50 publications

(11 citation statements)

References 17 publications

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“…With an increase in the Al content, the maximum and minimum relative densities of the compact increase. These observed trends are consistent with the literature [30]. It is known that the average relative density of the compacts with a dense initial packing is higher than that of the compacts with a loose initial packing, and thus, the properties of the compacts with these two initial packing structures are different.…”

Section: Conditions Heckel Equation Huang Equationsupporting

confidence: 92%

“…With an increase in the Al content, the maximum and minimum relative densities of the compact increase. These observed trends are consistent with the literature [30]. The equivalent von Mises stress distributions in the compacts with different Al contents corresponding to Figure 11 are shown in Figure 12.…”

Section: Conditions Heckel Equation Huang Equationsupporting

confidence: 91%

“…A 1 , A 2 , and A 3 are the hardening exponents, B 1 , B 2 , and B 3 are the constants [29]. Van Der Zwan and Siskens [30] proposed the following:…”

Section: Compaction Equationsmentioning

confidence: 99%

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Numerical Simulation of Densification of Cu–Al Mixed Metal Powder during Axial Compaction

Wang

Liu

et al. 2018

Metals

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The densification mechanism of Cu–Al mixed metal powder during a double-action die compaction was investigated by numerical simulation. The finite element method and experiment were performed to compare the effect of the forming method, such as single-action die compaction and double-action die compaction, on the properties of compact. The results showed that the latter could significantly raise the densification rate and were in good agreement with Van Der Zwan–Siskens compaction equation. The effects of the different initial packing structures on the properties of the compact were studied. The results showed that a high-performance compact could be obtained using a dense initial packing structure at a given compaction pressure. Additionally, the effects of the Al content and compaction pressure on the relative density and stress distribution were analyzed. It was observed that, with an increase in the Al content at a given compaction pressure, the relative density of the compact increased, whereas the stress decreased. Furthermore, when the Al content was fixed, the relative density and stress increased with increasing compaction pressure. The relationship between the relative density and the compaction pressure under different friction conditions was characterized and fitted according to the Van Der Zwan–Siskens compaction equation. The influence mechanisms of die wall friction on the compaction behavior were investigated. It was revealed that friction is a key factor that causes the inhomogeneity of the powder flow and stress distribution. Finally, the effects of the dwell time and height–diameter ratio on the densification behavior were analyzed, and it was found that an increase in the dwell time promoted the densification process, whereas an increase of the height–diameter ratio could hinder the process.

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Section: Conditions Heckel Equation Huang Equationsupporting

confidence: 92%

Section: Conditions Heckel Equation Huang Equationsupporting

confidence: 91%

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Numerical Simulation of Densification of Cu–Al Mixed Metal Powder during Axial Compaction

Wang

Liu

et al. 2018

Metals

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“…Compaction process of solid particles in a cylinder‐piston system involves several densification sequences that caused some difficulties in getting a direct theoretic expression for W P . Depending on the powder types and properties, those sequences can be summarized as elastic deformation, plastic deformation, and particle fragmentation …”

Section: Resultsmentioning

confidence: 99%

Modeling the Influence of Carbon Spheres on the Porosity of SOFC Anode Materials

2012

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The influence of fabrication pressure and other ceramic processing variables, including volumetric loading fraction and the particle size ratio of pore-forming agents, on the porosity of fabricated ceramic anodes, was investigated using an integrated experimental approach with mathematical modeling to differentiate the impacts of each parameter. Despite historic observation of the properties of ceramic bodies, to date, there is a lack of available models to accurately interpret the ceramic properties as a function of the processing variables. Herein, we focus on the open porosity of the solid oxide fuel cell anode prepared from NiO/YSZ (nickel oxide/yttria stabilized zirconia) as the ceramic powder and using CMS (carbon microspheres) as a pore-forming agent. A range of pore-former volumetric blend ratios (4.4%-44.6%) and different particle size ratios between NiO/YSZ and CMS (11.27, 4.29, and 0.26) were used, whereas the influence of the applied uni-axial fabrication pressure on the open porosity of sintered anode was studied in a range of atmospheric pressure up to 40 MPa. A good agreement was observed between the proposed model and the experimental data, implying that the approach could be used to determine the significant processing parameters to fabricate ceramics with desired porosity. The model could also be used to interpret the physical basis of pore formation when using a pore-forming agent in a fabricated porous ceramic body.

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“…The literature describes that press-sintering process is only a feasible technique if a low GNPs content is used in the composite. Otherwise, consolidation during sintering will be challenging [82,83]. For MMNCs with GNP content higher than 4 vol %, to reach full densification, an external pressure assisted method should be used.…”

Section: Consolidation and Sintering (Third Challenge)mentioning

confidence: 99%

An Overview of Key Challenges in the Fabrication of Metal Matrix Nanocomposites Reinforced by Graphene Nanoplatelets

Saboori

Moheimani

Dadkhah

et al. 2018

Metals

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This article provides an overview of research efforts with an emphasis on the fabrication of metal matrix nanocomposites (MMNCs) reinforced by graphene nanoplatelets (GNPs). Particular attention is devoted to finding the challenges in the production of MMNCs through the powder metallurgy techniques. The main technical challenges can be listed as: (I) reinforcement selection; (II) dispersion of reinforcement within the matrix; (III) reactivity between the reinforcement and matrix; (IV) interfacial bonding; (V) preferred orientation of reinforcement. It is found that some of these difficulties can be attributed to the nature of the materials involved, while the others are related to the preparation routes. It is reported that the challenges related to the process can often be addressed by changing the production process or by using post-processing techniques. More challenging issues instead are related to the composition of the matrix and reinforcement, their reactivity and the dispersion of reinforcement. These topics still bring significant challenges to the materials scientists, and it would be worth mentioning that the fabrication of MMNCs with a uniform dispersion of reinforcement, strong interfacial bonding, without detrimental reactions and improved isotropic properties is still a puzzling issue.

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The compaction and mechanical properties of agglomerated materials

Cited by 50 publications

References 17 publications

Numerical Simulation of Densification of Cu–Al Mixed Metal Powder during Axial Compaction

Numerical Simulation of Densification of Cu–Al Mixed Metal Powder during Axial Compaction

Modeling the Influence of Carbon Spheres on the Porosity of SOFC Anode Materials

An Overview of Key Challenges in the Fabrication of Metal Matrix Nanocomposites Reinforced by Graphene Nanoplatelets

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