A simple model for viscosity of powder injection moulding mixes with binder content above powder critical binder volume concentration

Reddy, J. Janardhana; Ravi, Nathan; Vijayakumar, M.

doi:10.1016/s0955-2219(00)00096-0

Cited by 34 publications

(12 citation statements)

References 18 publications

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“…Table 2 shows 3 exponential and 9 power law models found in the literature in chronological order [22,[25][26][27][28][29][30][31][32][33][34]. Table 2.…”

Section: Models For Viscosity Prediction Of Feedstocks With Differentmentioning

confidence: 99%

“…However it assumes that the flow is only due to the binder since the powder does not flow under shear due to inter-particulate friction and that there is a critical binder content at which all liquid present in the feedstock is utilized for filling up the particle structure in close packing [31].…”

Section: Model Author(s) Year Equation Of the Model Equation Numbermentioning

confidence: 99%

“…Please note that the vertical axis in Figures 6 and 7 In this investigation, seven distinct models were compared to find the most applicable to our MIM feedstocks. The models here investigated included the ones proposed by Frankel and Acrivos [28]; Chong et al [22]; Quemada [29]; van den Brule and Jongschaap [30]; Jonardhama et al [31]; Zarraga et al [32]; and, Mendoza and Santamaria-Holek [33]. See Equations (14)- (20) listed in Table 2.…”

Section: Viscosity Of Feedstock Materialsmentioning

confidence: 99%

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Models to Predict the Viscosity of Metal Injection Molding Feedstock Materials as Function of Their Formulation

González-Gutiérrez

Đuretek

Kukla

et al. 2016

Metals

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Abstract:The viscosity of feedstock materials is directly related to its processability during injection molding; therefore, being able to predict the viscosity of feedstock materials based on the individual properties of their components can greatly facilitate the formulation of these materials to tailor properties to improve their processability. Many empirical and semi-empirical models are available in the literature that can be used to predict the viscosity of polymeric blends and concentrated suspensions as a function of their formulation; these models can partly be used also for metal injection molding binders and feedstock materials. Among all available models, we made a narrow selection and used only simple models that do not require knowledge of molecular weight or density and have parameters with physical background. In this paper, we investigated the applicability of several of these models for two types of feedstock materials each one with different binder composition and powder loading. For each material, an optimal model was found, but each model was different; therefore, there is not a universal model that fits both materials investigated, which puts under question the underlying physical meaning of these models.

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“…Table 2 shows 3 exponential and 9 power law models found in the literature in chronological order [22,[25][26][27][28][29][30][31][32][33][34]. Table 2.…”

Section: Models For Viscosity Prediction Of Feedstocks With Differentmentioning

confidence: 99%

Section: Model Author(s) Year Equation Of the Model Equation Numbermentioning

confidence: 99%

Section: Viscosity Of Feedstock Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Models to Predict the Viscosity of Metal Injection Molding Feedstock Materials as Function of Their Formulation

González-Gutiérrez

Đuretek

Kukla

et al. 2016

Metals

View full text Add to dashboard Cite

show abstract

“…[28][29][30][31][32] Most of them are not suitable for PIM purpose because do not consider suspensions with high solid loadings. For PIM purpose a good model for describing the behaviour of feedstock against solid loading is the proposed by Janardhana-Reddy et al 32 According to this model, critical solid loading can be calculated by the following equation:…”

Section: Feedstock Rheologymentioning

confidence: 99%

Production of alumina parts by powder injection molding with a binder system based on high density polyethylene

Thomas-Vielma

Cervera

Levenfeld

et al. 2008

Journal of the European Ceramic Society

143

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“…The CPVC is the one corresponding to the feedstock with less activation energy, which means lower viscosity sensitivity to temperature variations and, thus, a higher possibility of manufacturing defect-free parts. The capillary rheometry technique can involve the evaluation of other rheological properties, such as shear viscosity and shear rate [42,46,47].…”

Section: Semicrystallinementioning

confidence: 99%

Development of Metal Powder Hot Embossing: A New Method for Micromanufacturing

Sequeiros

Emadinia

Vieira

et al. 2020

Metals

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Hot embossing is a small-scale, low-cost processing technology that can deliver products to the market in a short time. This microreplication technology is well established to produce polymeric components and has applications in several industrial sectors. The use of micropowder hot embossing in the production of metal components is an emerging and challenging process that, when compared to other typical technologies, brings some economic advantages in a volatile market with an increasing tendency to manufacture customized products. The main objective of this review is to analyze the potential of powder hot embossing and its developments in the production of metallic microparts/components. This technology requires four distinct steps: (1) production feedstock (preparation of mixtures), (2) hot embossing (shape forming), (3) debinding and (4) sintering. These steps are interrelated and influence the characteristics of the final metallic microparts. This study summarizes the approaches implemented for the use of different metallic powders and polymeric binder systems for the preparation of the feedstock, the mold materials and the critical conditions tested in the embossing step to produce green parts, and the production of the final parts through the application of debinding and sintering. Powder hot embossing is a viable replication technology that allows the production of new metallic microcomponents, contributing to the global scientific effort of miniaturizing manufacturing process, equipment and products. The merit of powder hot embossing for industrialization needs further development to assert itself in the market and compete with other micromanufacturing techniques.

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A simple model for viscosity of powder injection moulding mixes with binder content above powder critical binder volume concentration

Cited by 34 publications

References 18 publications

Models to Predict the Viscosity of Metal Injection Molding Feedstock Materials as Function of Their Formulation

Models to Predict the Viscosity of Metal Injection Molding Feedstock Materials as Function of Their Formulation

Production of alumina parts by powder injection molding with a binder system based on high density polyethylene

Development of Metal Powder Hot Embossing: A New Method for Micromanufacturing

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