Investigation of Properties of Powder Injection-Molded Steatites

Urtekin, Levent; Uslan, Ibrahim; Tuc, Bedri

doi:10.1007/s11665-011-9901-8

Cited by 13 publications

(16 citation statements)

References 7 publications

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“…In this study, a binder formulation with PEG developed by Urterkin [13] and Checot-Moinard [14] and referenced by Enneti [1] was adopted. The composition of the binder is given in Table 1.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

The degradation of poly(ethylene glycol) in an Inconel 718 feedstock in the metal injection moulding process

2015

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The degradation and stability of polymer binders in feedstock for metal injection moulding (MIM) have been rarely investigated. Feedstock is a mixture of polymer constituents and metallic powder and is subject to variations in temperature and the complexity of its mechanical effects. The mixture is pressed and squeezed in a mixer with two counter-rotating screws and injected into the mould cavities. This paper investigates the degradation and stability of polymer constituents under the conditions of mixing and injection. The interactions among different constituents were measured and analysed. The methods and application of the equipment are introduced with sufficient detail. The kinetics of decomposition for poly(ethylene glycol) (PEG) are studied to explain the mechanism of its degradation. The measurement of the carbonyl group resulted in a quantitative discussion of the decomposition. The effects of PEG degradation on its behaviour were also investigated and found to show benefits for the metal injection process. Moreover, it is proved that the combination of PEG and polypropylene (PP) is not favourable for a homogenous binder. Thus, other constituents should be found to use instead. The research reveals the degradation and stability of polymer binders under conditions of MIM technologies. It provides a reference for the choice and validation of MIM binder constituents.

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Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

The degradation of poly(ethylene glycol) in an Inconel 718 feedstock in the metal injection moulding process

2015

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“…To avoid the wear of the mixing and molding equipment, the optimal solid loading which is approximately 2 to 5 vol.% lower than critical loading value was used. Also, during injection molding shear rates vary between 100 and 1000 s −1 and the flow during molding requires a viscosity less than 1000 Pa s −1 [31]. Hence, the optimum powder/binder ratio was chosen as 53/47 vol.% (F2).…”

Section: Results Of Capillary Rheometermentioning

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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“…The correlation of viscosity with the temperature is considerable in PIM process, as well [22]. The viscosity was decreased depending on the increased temperature [23]. If the viscosity is very susceptible to the temperature alteration, a little undulation of temperature through molding will production viscosity variations, making stress concentration in the molded part, eventuating in distortion and fracture [24].…”

Section: Effect Of Temperature On Viscositymentioning

confidence: 99%

“…This situation is thought to be related with the effectiveness of PW and PP in the binding system. When used as a backbone binder in a binding system, it is known that PP increases the green density after molding; on the other hand, it decreases the flowability [23].…”

Section: Fluiditymentioning

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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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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Investigation of Properties of Powder Injection-Molded Steatites

Cited by 13 publications

References 7 publications

The degradation of poly(ethylene glycol) in an Inconel 718 feedstock in the metal injection moulding process

The degradation of poly(ethylene glycol) in an Inconel 718 feedstock in the metal injection moulding process

An investigation of moldability and mechanical properties of MgO added alumina

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

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