Fabrication of hollow, 3D, micro-scale metallic structures by micro-powder injection moulding

Attia, Usama M.; Alcock, Jeffrey R.

doi:10.1016/j.jmatprotec.2012.05.022

Cited by 18 publications

(7 citation statements)

References 16 publications

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“…Here we report on a strategy by which articulated architectures with micro-scale 3-D cavities can be fabricated using a lost-core approach. The authors have previously demonstrated the possibility of producing dimensionally controlled, enclosed micro-cavities by sequential powder over-moulding of metals (Attia and Alcock, 2012 ) and ceramics (Attia and Alcock, 2011b).…”

Section: Methodsmentioning

confidence: 99%

Creating movable interfaces by micro-powder injection moulding

Attia

Hauata

Walton

et al. 2014

Journal of Materials Processing Technology

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This paper presents a novel in-situ technique to produce articulated components with highprecision, micro-scale movable interfaces by micro-powder injection moulding (μPIM). The presented process route is based on the use of micro-scale sacrificial layer between the movable subcomponents which is eliminated during the debinding step, creating a dimensionally-controlled, micro-scale mobile interface. The fabrication technique combines the advantages of micro-powder overmoulding, catalytic debinding and sintering. The demonstrated example was a finger bone prosthesis joint consisting of two sub-components with an interface between components of 200 μm in size. The geometries of the subcomponents were designed such that they are inseparable throughout the process whilst allowing them to move relative to each other after the debinding stage. The components produced showed the feasibility of the process route to produce readily-assembled meso-, and potentially micro-, scale articulated systems.

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Section: Methodsmentioning

confidence: 99%

Creating movable interfaces by micro-powder injection moulding

Attia

Hauata

Walton

et al. 2014

Journal of Materials Processing Technology

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“…Another more recent example [17] describes the use of a molded POM core with overmolding of a ceramic-polymer powder that is subsequently debinded and sintered to produce a ceramic part. The author expects the use of lost core processes to increase with the availability of 3D printing processes by which such cores can be made.…”

Section: 43lost Core Moldingmentioning

confidence: 99%

Mold Technologies

Kazmer¹

2016

Injection Mold Design Engineering

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“…During the debinding, all components of the binder systems are extracted from the green part gradually using different techniques and without causing any defect [ 7 ]. Sintering, the final step, is done in the furnace by heating parts to temperatures lower than the melting point of the metal or ceramic used to achieve a nearly complete density part with high mechanical properties [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Polypropylene (PP)-Backbones in Aluminium Feedstock for Fused Filament Fabrication (FFF)

et al. 2023

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The current study presents the effect of the backbone as an important binder component on the mechanical, rheological, and thermal properties of Aluminium (Al) alloy feedstocks. A thermoplastic elastomer (TPE) main binder component was blended with either polypropylene (PP), grafted-maleic anhydride-PP (PPMA), or grafted-maleic anhydride-PPwax (PPMAwax) plus PP, as the backbone. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) tests were performed to investigate the thermal properties of binder systems and feedstocks. Fourier-transform infrared (FTIR) spectroscopy was used to study the chemical interaction between the binder and the Al alloy. After making feedstock filaments, tensile tests, scanning electron microscopy (SEM), and fused filament fabrication (FFF) printing were done. The results showed that although the PP printability was acceptable, the best mechanical properties and printed quality can be achieved by PPMA. TGA test showed that all binder systems in the feedstocks could be removed completely around 500 °C. From FTIR, the possibility of chemical reactions between Al alloy particles and maleic anhydride groups on the grafted PP backbone could explain the better dispersion of the mixture and higher mechanical properties. Tensile strength in PP samples was 3.4 MPa which was improved 1.8 times using PPMA as the backbone.

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Fabrication of hollow, 3D, micro-scale metallic structures by micro-powder injection moulding

Cited by 18 publications

References 16 publications

Creating movable interfaces by micro-powder injection moulding

Creating movable interfaces by micro-powder injection moulding

Mold Technologies

Effects of Different Polypropylene (PP)-Backbones in Aluminium Feedstock for Fused Filament Fabrication (FFF)

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