Development of a High-Velocity Compaction process for polymer powders

Azhdar, Bruska; Stenberg, Bengt; Kari, Leif

doi:10.1016/j.polymertesting.2005.06.008

Cited by 37 publications

(23 citation statements)

References 24 publications

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“…The successive peaks of stress and strain appear to be simultaneous. They may correspond to successive shock wave reflections (as noticed by Azhdar et al [12]). Only the first stress peak (or main stress peak) will be considered as the forming HVC pressure.…”

Section: F Fi Ig G 1 1: : S Sc Ch He Em Ma At Ti Ic C O Of F H Hv mentioning

confidence: 83%

“…Initial studies with alumina powders have shown that higher stresses (greater than 1 GPa) could be reached and that the final tablets were more homogeneous [9]. Computer simulations of HVC have been performed by some authors [10] and [11] and a comparative study of conventional pressing and HVC has been done for various materials [12] and [13]. The aim of this study is to understand the influence of the powder formulation and of the forming method on tablets properties and then to compare the compaction behaviours of a powder bed submitted to each of the forming processes.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the formulation of an alumina powder on compaction

Souriou¹,

Goeuriot²,

Bonnefoy³

et al. 2009

Powder Technology

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International audienceThe compression of ceramic powders requires the addition of organic materials to insure tablet cohesion. For the compaction of formulated ceramic powders it is necessary to supply them energy. As a function of the formulation of ceramic powders, one can measure the specific energy acquired during the tablet compression. Recently, a technique used in powder metallurgy, High Velocity Compaction (HVC), has been studied to form ceramic compacts. This method brings special physical properties to tablets in terms of homogeneity compared to conventional uniaxial pressing. The properties of tablets prepared by the two processes are compared and discussed through a phenomenological model

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Section: F Fi Ig G 1 1: : S Sc Ch He Em Ma At Ti Ic C O Of F H Hv mentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Influence of the formulation of an alumina powder on compaction

Souriou¹,

Goeuriot²,

Bonnefoy³

et al. 2009

Powder Technology

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“…Densification at this stage is thought to be nearly complete, as further increase in pressure can permanently crush or flatten the contact zones of the particles. At maximum compaction pressure, extreme resistance against further densification is observed, specifically due to strain hardening of materials [8][9][10]. One of the areas where this dynamic compaction can effectively contribute is through making the compaction process faster.…”

Section: Resultsmentioning

confidence: 99%

Effect Of Ti Powder Addition On The Fabrication Of TiO2 Nanopowders

Raihanuzzaman¹,

Park²,

Ghomashchi³

et al. 2015

Archives of Metallurgy and Materials

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Sintered samples of Ti added TiO 2 nanopowders were fabricated by combined application of magnetic pulsed compaction (MPC) and sintering. The effect of Ti nano powder on density, shrinkage and hardness of the samples were investigated as part of the study. The optimum processing conditions were found to be around 0.5 GPa MPC pressure and 1450 • C sintering temperature, illustrating maximum density, hardness and minimum shrinkage. High pressure compaction using MPC was found to enhance density with increasing MPC pressure up to 0.9 GPa, and significantly reduce the total shrinkage (about 16% in this case) in the sintered bulks compared to other general processes (about 18%). While sintered samples blended with micro Ti showed presence of microstructural cracks, the samples with 1-2% nano Ti had less or no cracks on them. Overall, the inclusion of nano Ti indicated improvement in mechanical properties of TiO 2 nanopowders sintered preforms as opposed to micro Ti-added TiO 2 .

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“…Two 5 mm-thick disk-shape tablets made of the punch material and with the same diameter were put beneath and on the top of the powder to reduce the spring-back effect of the specimen and to improve the compaction procedure [27]. The projectile impact on the punch induces a stress wave that travels down the punch toward the powder.…”

Section: Fabrication Of Al7075-sic Nanocompositementioning

confidence: 99%