Isotropic forming of porous structures via metal injection molding

Heaney, Donald F.; Gurosik, J. D.; Binet, C.

doi:10.1007/s10853-005-6516-1

Cited by 14 publications

(5 citation statements)

References 13 publications

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“…In recent years, the miniaturisation and manufacturing of micro-components have gained increasing attention in both industry and academia [1][2][3][4]. The microinjection moulding process is rapidly becoming one of the most promising fabrication technologies for the mass production of thermoplastic polymer micro-parts [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Characterisation and replication of metallic micro-fluidic devices using three different powders processed by hot embossing

Sahli¹,

Gelin²,

Barrière³

2013

Powder Technology

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International audienceThis study presents the results of micro-replication of different powder feedstocks samples. The feedstocks of metal powder and plastic binder with various solid loading in the range from 40% to 75% were prepared. The different feedstock comprises 316 L stainless steel, Fe\Ni 8%, orWC-Co and amulti-component binder system. Suitable polymers/powder formulations for the hot embossing were chosen and characterised by thermogravimetric analyses (TGA), mixer measurements and capillary rheology testing in order to check and quantify the viscosity and homogeneity of all the developed feedstocks. The photoresist (SU-8) was used as a structural material that was deposited onto the Si wafer to obtain the micro-fluidic systems with low roughness. Then the elastomeric mouldwas obtained using casting with one face that contains all the details of the originalmaster, very well defined and smooth sidewalls. The objective of the paper is to develop metallic micro-structured die mould cavities with higher quality using hot embossing process with various different powder loaded polymers. However, a rapid prototyping process was adapted for fast and cost-efficient manufacturing. This study compares the capacities of three different metallic powders to emboss of the metallic replications by hot embossing, the dimensional stability, the mechanical strength and particularly hardness of sintered components. The results show that the feedstock can be used for the manufacturing of the micro-fluidic die mould cavities with a low roughness, proper dimensions and good shape retention

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Section: Introductionmentioning

confidence: 99%

Characterisation and replication of metallic micro-fluidic devices using three different powders processed by hot embossing

Sahli¹,

Gelin²,

Barrière³

2013

Powder Technology

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“…Open porous structures can also be used for high-performance applications, such as heat exchangers and heat sinks for thermal management, as well as medical implants, filters, and electrodes for biological and chemical reactions. The various beneficial characteristics of these materials and their manufacturing methods are listed by Heaney et al [2]. One of the method is using a space holder material like NaF and NaCl in the hot isostatic pressing (HIP) process to achieve well-defined porosities and pore sizes.…”

Section: Introductionmentioning

confidence: 99%

Rheological Characterization of Powder Mixture Including a Space Holder and Its Application to Metal Injection Molding

Park

Kim

Lin

et al. 2017

Metals

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Abstract:Metal injection molding (MIM) with the space holder technique is becoming one of the important fabrication methods for a net-shape production of micro-sized, porous, complex-shaped metal parts. For a successful injection molding step, rheological behavior of MIM feedstock is essential, which includes peculiar characteristics, such as a wall slip phenomenon. SUS 316L stainless steel powder, binder systems (paraffin wax, polypropylene, polyethylene, stearic acid) and three different sizes of spherically-shaped polymethyl methacrylate (PMMA) as a space-holder were used for this study. The porosity was controlled by varying the volume fraction of the space holder and a total of six different feedstocks were prepared. Rheological characteristics of the feedstock was investigated, especially on viscosities, including wall slip quantification by using a capillary rheometer. By thermogravimetric analysis, the debinding process for completely removing the space holder was proposed. Finally, the shrinkage and porosity of the tensile specimen produced through the sintering process were analyzed and the ultimate tensile strength was obtained.

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“…MIM is one of the near-net-shaped molding processes in manufacturing. The primary advantage of MIM compared with other methods is its low cost for mass-producing small and complex precision parts [2]. The MIM process has four stages: powder and binder mixing, injection molding, debinding, and sintering as shown on the Fig.1.…”

Section: Introductionmentioning

confidence: 99%

Effect of mixing parameters on the mixing time and density of composite HA/Ti6Al4V feedstock for powder injection molding

Arifin

Sulong

2017

MATEC Web Conf.

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Abstract. Hydroxyapatite is a bioactive material. However, Hydroxyapatite in medical application is limited by its poor mechanical properties. Titanium alloys are biocompatible materials with high specific strength and high corrosion resistance. This combination can successfully be used in biomedical applications. The mixing process is a critical stage in the metal injection molding process because it determines the quality of the metal injection product. The homogeneity of the feedstock depends on the mixing parameters used during the mixing process. An experiment was conducted using Ti6Al4V and hydroxyapatite powder as feedstock at a mixing ratio of 60:40 wt%. This feedstock was mixed with a mixture of polyethylene and palm stearin as the binder. The mixing parameters used in this study were the mixing speed (10 and 30 rpm) and the mixing temperature (130°C and 150°C) at a powder loading of 67%, as determined by the critical powder volume percentage experiment data (69.5%). Increases in the mixing speed and mixing temperature reduced the mixing time to achieve homogeneity. The combined feedstock achieved the highest density at a mixing speed of 30 rpm and a mixing temperature of 150°C.

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Isotropic forming of porous structures via metal injection molding

Cited by 14 publications

References 13 publications

Characterisation and replication of metallic micro-fluidic devices using three different powders processed by hot embossing

Characterisation and replication of metallic micro-fluidic devices using three different powders processed by hot embossing

Rheological Characterization of Powder Mixture Including a Space Holder and Its Application to Metal Injection Molding

Effect of mixing parameters on the mixing time and density of composite HA/Ti6Al4V feedstock for powder injection molding

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