Compaction Equation and Its Use to Describe Powder Consolidation Behavior

Panelli, Renato; Filho, Francisco Ambrozio

doi:10.1179/pom.1998.41.2.131

Cited by 49 publications

(28 citation statements)

References 2 publications

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“…Several phenomenological compacting equations have been proposed in the literature, such as Heckel's analysis [22,23], Kawakita and Lüdde's model [24], etc. Panelli and Ambrozio Filho [25] reviewed various equations for modeling compaction, and they also proposed a new model [26]. These compacting equations may replace Eq.…”

Section: Discussionmentioning

confidence: 98%

Modeling and Control of Roller Compaction for Pharmaceutical Manufacturing. Part I: Process Dynamics and Control Framework

Hsu¹,

Reklaitis

Venkatasubramanian

2010

J Pharm Innov

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We derive a dynamic model for roller compaction process based on Johanson's rolling theory, which is used to predict the stress and density profiles during the compaction and the material balance equation which describes the roll gap change. The proposed model considers the relationship between the input parameters (roll pressure, roll speed, and feed speed) and output parameters (ribbon density and thickness), so it becomes possible to design, optimize, and control the process using the model-based approach. Currently, the operating conditions are mostly found by trial and error. The simulation case studies show the model can predict the ribbon density and gap width while varying roll pressure, feed speed, and roll speed. The roll pressure influences the ribbon density much more than roll speed and feed speed, and the roll gap is affected by all three input parameters. Both output variables are very insensitive to the fluctuation of inlet bulk density. If the ratio of feed speed to roll speed is kept constant, neither ribbon density nor gap width change, but the production rate changes proportionally with feed speed. Based on observations from simulations, a control scheme is proposed. Furthermore, Quality by Design of the roller compactor can be achieved by combining this model and optimization procedure.

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Section: Discussionmentioning

confidence: 98%

Modeling and Control of Roller Compaction for Pharmaceutical Manufacturing. Part I: Process Dynamics and Control Framework

Hsu¹,

Reklaitis

Venkatasubramanian

2010

J Pharm Innov

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“…Stage III: Massive plastic deformation, porosity reduction (less than 5% e.g. at 1 GPa) [12][13][14][15][16][17][18][19][20].…”

Section: Stage I: Reorientation/ Rearrangement and Packing Particulatmentioning

confidence: 99%

Densification Mechanism, Elastic-Plastic Deformations and Stress-Strain Relations of Compacted Metal-Ceramic Powder Mixtures (Review)

Popescu

Vidu

2018

Scientific Bulletin of Valahia University - Materials and Mechanics

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The basic purpose of compaction is to obtain a green compact with sufficient strength to withstand further handling operations. The strength of green compact is influenced by the characteristics of the powders (apparent density, particle size and shape, internal pores etc.), the processing parameters (applied force, pressing type, and temperature) and testing conditions (strain rate etc.) Successful powder cold compaction is determined by the densification and structural transformations of powders (metallic powders, ceramic powders and metal-ceramic powder mixtures) during the compaction stages. In this paper, for understanding the factors that determine a required strength of compacted metal-ceramic powder mixtures, we present the densification mechanisms of different mixtures according to densification theories of compaction, the elastic-plastic deformations of mixture powders, the stressstrain relations and the relaxation behavior of compacted metal-ceramic composite parts and the particularities of each of them.

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“…If there is a large amount of fine powder in relation to the thick (coarse) ones, the porosity will increase [20]. With further increase of applied pressure, the number of contacts increases and the density of the compacted bulk tending towards to the true densities of the component ingredients, leading to porosity decreasing (stage III) [4][5][6][7][8][9][10][11][12]. This is explained by packagingrepackaging of metallic and ceramic particles at higher pressures.…”

Section: Roberts and Rowementioning

confidence: 99%

Compaction of Metal-Ceramic Powder Mixture. Part.1

Popescu¹,

Vidu²

2017

ARA Journal

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The strength of green compact is influenced by the characteristics of the powders (apparent or tap density, particle size and shape, internal pores etc.), the processing parameters (applied force, pressing type, temperature) and testing conditions (strain rate etc.). For elucidation the phenomena that arise in the compaction of metallic and ceramic powders mixtures, in the first part of the paper, we present the mechanisms that influence the densification behaviour, the post-elastic effect, the compressibility of different (e.g. Al or Cu alloys-SiC/Al 2 O 3 / TiO2) mixture powders and the particularities of each of them during the three stages of compaction.

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Compaction Equation and Its Use to Describe Powder Consolidation Behavior

Cited by 49 publications

References 2 publications

Modeling and Control of Roller Compaction for Pharmaceutical Manufacturing. Part I: Process Dynamics and Control Framework

Modeling and Control of Roller Compaction for Pharmaceutical Manufacturing. Part I: Process Dynamics and Control Framework

Densification Mechanism, Elastic-Plastic Deformations and Stress-Strain Relations of Compacted Metal-Ceramic Powder Mixtures (Review)

Compaction of Metal-Ceramic Powder Mixture. Part.1

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