Rheological properties of feedstocks prepared with steatite powder and polyethylene-based thermoplastic binders

Karataş, Çetin; Kocer, A.; Ünal, Halíl Íbrahím; Saritaş, Süleyman

doi:10.1016/j.jmatprotec.2004.03.009

Cited by 70 publications

(50 citation statements)

References 19 publications

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“…It is thought that the high amount of PW and CW in F2 is the reason for high flowability. PW enables higher flowability for feedstocks in PIM process [27]. Flowability values of feedstocks prepared with F3 are close to the values of F2 feedstocks.…”

Section: Fluiditysupporting

confidence: 55%

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An Analysis of Rheological Properties of Inconel 625 Superalloy Feedstocks Formulated with Backbone Binder Polypropylene System for Powder Injection Molding

Gökmen

Türker

2017

Archives of Metallurgy and Materials

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B inder formula is one of the most significant factors which has a considerable influence on powder injection molding (PIM) processes. In the study, rheological behaviors and properties of different binder systems containing PIM feedstocks, Inconel 625 powder commonly used in space industry, were investigated. The feedstocks were prepared 59%-69% (volume) powder loading ratios with three diversified binder systems by use of Polypropylene as backbone binder. The average particle size of the Inconel 625 powder used was 12.86 microns. Components used in the binder were mixed for 30 minutes as dry in three dimensional mixing to prepare binder systems. Rheological features of the feedstock were characterized by using a capillary rheometer. Viscosities of the feedstocks were calculated within the range of 37.996-1900 Pa.s based on the shear rate, shear stress, binder formula and temperature. "n" parameters for PIM feedstocks were determined to be less than 1. Influences of temperature on the viscosities of the feedstocks were also studied and "Ea" under various shear stresses were determined within the range of 24.41-70.89 kJ/mol.

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Section: Fluiditysupporting

confidence: 55%

“…Thus, powder loading may be favored into the range from 61% to 65%. Karatas et al avowed that low viscosity with low activation energy is a fundamental requirement for a good PIM [27]. F3 containing feedstocks show the lowest Ea values.…”

Section: Effect Of Temperature On Viscositymentioning

confidence: 99%

An Analysis of Rheological Properties of Inconel 625 Superalloy Feedstocks Formulated with Backbone Binder Polypropylene System for Powder Injection Molding

Gökmen

Türker

2017

Archives of Metallurgy and Materials

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“…[1][2][3][4], there is no relevant reference in literature concerning the pressure affected viscosity up to date, and even for pure polymers, where the influence of pressure on the flow behaviour is significant, reported results are ambiguous.…”

Section: Introductionmentioning

confidence: 99%

Pressure-affected flow properties of powder injection moulding compounds

2009

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The effect of pressure and temperature on the flow properties of the materials intended for Powder Injection Moulding (PIM) technology was studied using a single-piston capillary rheometer modified by additional backpressure chamber. The influence of pressure and temperature on shear viscosity has been quantified through pressure and temperature sensitivity coefficients derived from Carreau-Yasuda model. The temperature sensitivity of the 50 vol.% compound based on cemented carbide powder is lower than that of pure polymeric binder, and it varies only slightly with pressure. In contrast, the pressure sensitivity of compounds was found to be higher than that of pure polyolefin binder, and it is decreasing function of temperature. In addition, it is shown that temperature sensitivity of binder, which is considerably enhanced by pressure (in contrast to the PIM demands), cannot be determined as being equal to the properties of particular binder components.

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“…A feedstock, which has good homogeneity, high stability, low viscosity at the processing temperature, proper flow behavior and low shear stress, enables the perfect injection molding [29]. Rheology experiments were carried out by capillary rheometer for fear that the clogging problem might occur in injection molding operation.…”

Section: Methodsmentioning

confidence: 99%

An investigation of moldability and mechanical properties of MgO added alumina

Erdem¹,

Urtekin²,

Uslan³

2018

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In this study, the influence of MgO addition on mechanical properties of the injection molded alumina was investigated. Firstly, alumina feedstocks (without adding MgO) were prepared to determine the optimum powder/binder ratio by the capillary rheometer. Then, MgO was added at 0.5, 1 and 1.5 wt.% to alumina feedstocks at the optimum ratio. Moldflow simulation analysis (MSA) was performed to obtain injection parameters (injection pressure, flow rate and feedstock temperature) before the real molding operation. Through the agency of the pre-operating parameters obtained from MSA, preliminary trials were carried out by molding machine for successful specimens (tensile and bending). By comparison of experimental and analytical results, the error rate of injection parameters was determined for both specimens. The maximum strengths of bending and tensile test values were found 158 MPa and 69 MPa (in specimens containing 1 wt.% MgO), respectively. Analysis of SEM revealed that specimens containing 1 wt.% MgO had less porosity.K e y w o r d s : alumina, powder injection molding, rheology, sintering, moldability

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Rheological properties of feedstocks prepared with steatite powder and polyethylene-based thermoplastic binders

Cited by 70 publications

References 19 publications

An Analysis of Rheological Properties of Inconel 625 Superalloy Feedstocks Formulated with Backbone Binder Polypropylene System for Powder Injection Molding

An Analysis of Rheological Properties of Inconel 625 Superalloy Feedstocks Formulated with Backbone Binder Polypropylene System for Powder Injection Molding

Pressure-affected flow properties of powder injection moulding compounds

An investigation of moldability and mechanical properties of MgO added alumina

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