The influence of particle morphology on the dynamic densification of metal powders

Eakins, Daniel E.; Chapman, David J.

doi:10.1063/1.3686565

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…Some experimental studies (Sevillano 2001, Eakins and Chapman, 2012, Cai et al, 2015 focused on the macroscopic response to various influential factors during powder compaction, but the particle-scale influential mechanism of the macroscopic response has not been clearly identified. Friction is a major role in powder compaction which causes energy loss and inhomogeneous density distribution.…”

Section: Effect Analysis Of Friction Particle Size and Compacting Vementioning

confidence: 99%

Experimental and numerical investigation of densification behaviors during powder compaction

Lei

Yan

Huang

et al. 2018

JAMDSM

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With the rapid development of manufacturing technology powder compaction has been a highly-developed forming technology for manufacturing net shape or near net shape parts with complex geometries and special mechanical performances. An experimental and numerical investigation was made to study the densification behaviors during powder compaction. A series of compaction tests were carried out. A numerical model using multi-particle finite element model (MPFEM) was presented for densification analysis, particles were discretized with fine elements for precise description of inter-particle interactions, and three initial packing structures (hexagonal, tetragonal, and random) were considered in the numerical model. The simulation results of the multi-particle finite element model with random packing structure were in good agreement with experimental results, and can give further insight into the particle-level densification mechanism behind the macroscopic phenomenon in physical compaction tests. Particles' flow behavior, stress field and energy conversion, that are related to the particle rearrangement, contact interactions and local plastic deformation, were detailed analyzed with the numerical model. The effects of friction, particle size and compacting velocity on compaction densification were discussed, and response surface studies of inter-particle friction, particle size and compacting velocity were completed for compaction process optimization.

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Section: Effect Analysis Of Friction Particle Size and Compacting Vementioning

confidence: 99%

Experimental and numerical investigation of densification behaviors during powder compaction

Lei

Yan

Huang

et al. 2018

JAMDSM

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“…Due to the materials being processed using the same methods, the Vickers results were mainly intended for relative comparison between the AAM electrodes. For 0%MO and 100%MO, the pore/void volume fraction was ∼0.45, which was slightly higher than previously reported ranges for AAM electrodes of other materials via similar processing of 0.32–0.41. − This outcome could originate from the different particle morphology, the surface energy, or diffusivity of the constituent materials. − The 25%MO, 50%MO, and 75%MO all had lower pore/void volume fractions of ∼0.42, suggesting that the higher packing density was achieved for mixing the MO flakes and TNO aggregates with different sizes and shapes. Parenthetically, full-density pellet samples were not expected, given the heating process at such low processing temperature.…”

Section: Resultsmentioning

confidence: 67%

Stable Multicomponent Multiphase All Active Material Lithium-Ion Battery Anodes

Cai

Gao

Sun

et al. 2023

ACS Appl. Mater. Interfaces

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Due to their high energy density, lithium-ion batteries have been the state-of-the-art energy storage technology for many applications. Energy density can be further improved by engineering of the electrode architecture and microstructure, in addition to more common improvements via materials chemistry. All active material (AAM) electrodes consist of only the electroactive material that stores energy, and such electrodes have advantages to conventional composite processing with regards to improved mechanical stability at increased thicknesses and ion transport properties. However, the absence of binders and composite processing makes the electrode more vulnerable to electroactive materials with volume change upon cycling. Also, the electroactive material must have sufficient electronic conductivity to avoid large matrix electronic overpotentials during electrochemical cycling. TiNb 2 O 7 (TNO) and MoO 2 (MO) are electroactive materials with potential advantages as AAM electrodes due to relatively high volumetric energy density. TNO has higher energy density, and MO has much higher electronic conductivity, and thus a multicomponent blend of these materials was evaluated as an AAM anode. Herein, blends of TNO and MO as AAM anodes were investigated, where this is the first use of a multicomponent AAM anode. Electrodes that had both TNO and MO had the highest volumetric energy density, rate capability, and cycle life relative to single component TNO and MO anodes. Thus, using multicomponent materials provides a route to improve AAM electrochemical systems.

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