Effect of mixing on the rheology and particle characteristics of tungsten-based powder injection molding feedstock

Suri, Pavan; Atre, Sundar V.; German, Randall M.; Souza, Júpiter Palagi de

doi:10.1016/s0921-5093(03)00146-1

Cited by 86 publications

(54 citation statements)

References 15 publications

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“…Torque rheometer could be limited for exerting enough shear stresses to agglomerate breakage. 3 If the binder is not able to provide with enough shear stress too, high binder contents could also limit agglomerate breakage. 17 However during mixing process of high solid loadings concentrations at torque rheometer, agglomerates interactions increase.…”

Section: Temperature Viscosity Dependencementioning

confidence: 99%

“…1,2 Careful choice of mixing method and parameters is the key for achieving a homogeneous mixture that is free of agglomerates and has an optimal powder and binder content. 3 Solid loading is defined as the ratio of powder volume to the total volume of solids and binder. Determination of the optimal solid loading admitted by the binder system is also important.…”

Section: Introductionmentioning

confidence: 99%

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Torque rheology of zircon feedstocks for powder injection moulding

Hidalgo

Jiménez-Morales

Torralba

2012

Journal of the European Ceramic Society

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Section: Temperature Viscosity Dependencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Torque rheology of zircon feedstocks for powder injection moulding

Hidalgo

Jiménez-Morales

Torralba

2012

Journal of the European Ceramic Society

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“…2a, as expected for particle sizes in the sub-micron range [8]. A robust protocol was therefore needed to obtain reproducible particle sizing results from laser diffraction measurements (Mastersizer 2000, Malvern Inst., UK).…”

Section: Powdermentioning

confidence: 99%

“…Solid line shows Carreau model [Eq. (8)] fit to experimental data over the whole shear rate range, with parameters as given in Table 4; b effect of temperature on flow behaviour; c apparent viscosity at 27 s -1 over temperature range 25-60°C. Regions A, B and C, indicated by vertical dashes, refer to transitions shown in Fig.…”

Section: Ram Extrusion Of Pastesmentioning

confidence: 99%

“…Micro-PIM is gaining popularity for the fabrication of small complex-shaped ceramic or metallic parts with high density [6]. Powder particle sizes ranging from sub-micron to 20 lm are regarded as ideal for PIM [7] (smaller for micro-PIM), but particles with these sizes are subject to poor flowability and self-agglomeration [8]. Lubrication of particle flow during the moulding process is provided by the addition of binder materials, normally liquids, to form a paste [9].…”

Section: Introductionmentioning

confidence: 99%

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Influence of visco-elastic binder properties on ram extrusion of a hardmetal paste

Ferstl

Barbist²,

Rough

et al. 2012

J Mater Sci

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The influence of the viscous and elastic components of a visco-elastic binder phase on the extrusion behaviour of a tungsten carbide-cobalt hardmetal paste was investigated by studying the paste over a range of temperatures, 30-42°C, where the binder changed from a semi-solid gel to a viscous liquid. The extrusion behaviour of the paste was studied by ram extrusion and quantified by the Benbow-Bridgwater (BB) method. The elastic and viscous components of the binder were studied separately by means of oscillatory and steady shear techniques in a controlled stress rheometer using rough parallel plates. The paste behaviour fitted the four parameter BB model well: the initial bulk yield stress parameter, r 0 , increased linearly with the binder elastic modulus, G 0 , while both the velocity dependence parameters a and b were linearly related to the binder steady shear viscosity. Analysis of paste-wall slip parameters gave estimated slip layer thicknesses of 2-5 particle diameters. List of symbols Roman APre-exponential factor in Eq. (6) (Pa s) C Carreau relaxation time constant (s) d 10 10 % of the population are smaller than this diameter (m) d 50 50 % of the population are smaller than this diameter (m) d 90 90 % of the population are smaller than this diameter (m) d [4,3] Volume moment (De Brouckere) mean diameter (m) D Die land diameter (m) D 0 Barrel diameter (m) E Activation energy in Eq. (6) (J mol -1 ) G 0 Elastic shear modulus (Pa) G 0 B Elastic shear modulus of unloaded binder (Pa) G 00 Viscous shear modulus (Pa) [k] Intrinsic viscosity (-) K Herschel-Bulkley consistency (Pa s k ) L Die land length (m) m Benbow-Bridgwater die entry velocity index (-) n Benbow-Bridgwater wall slip velocity index (-) pCarreau power law index (-) P ex Extrusion pressure (Pa) P 1 Component of extrusion pressure associated with die entry flow (Pa) P 2 Component of extrusion pressure associated with die land flow (Pa) R Universal gas constant (J mol -1 K -1 )Mean extrudate velocity (m s -1 )Greek a Benbow-Bridgwater extensional deformation velocity coefficient (Pa s m m -m ) bBenbow-Bridgwater wall slip velocity coefficient (Pa s n m -n ) _ cShear rate (s -1 ) _ c app Apparent shear rate (s -1 )

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The Effect of Paste Water Content on the Green Microstructure of Extruded Titanium Dioxide

Alazzawi

Haber

2018

Ceramic Transactions Series

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Effect of mixing on the rheology and particle characteristics of tungsten-based powder injection molding feedstock

Cited by 86 publications

References 15 publications

Torque rheology of zircon feedstocks for powder injection moulding

Torque rheology of zircon feedstocks for powder injection moulding

Influence of visco-elastic binder properties on ram extrusion of a hardmetal paste

The Effect of Paste Water Content on the Green Microstructure of Extruded Titanium Dioxide

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