Micro powder injection molding: process characterization and modeling

Heldele, Richard; Schülz, Michael; Kauzlarić, David; Korvink, Jan G.; Haußelt, J.

doi:10.1007/s00542-006-0117-z

Cited by 33 publications

(21 citation statements)

References 17 publications

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“…As ar esult, it was verified that decreasing the injection velocity can eliminate the jetting and porosity in line with the results of the similarly conducted studies [4,6,7]. However, the givencondition deterioratedthe surface quality of components due to rapid solidification of the molten feedstock.…”

Section: Resultssupporting

confidence: 81%

The impact of injection velocity on the defects in thick components fabricated by inserted metal injection molding

Safarian

Karataş

2015

International Journal of Materials Research

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The initial stage of shaping ac omponent in metal injection molding is the injection process. Any defects occurring in this stage are transferred to the subsequent stages, namely debinding and sintering. To investigate the jetting phenomenon in the current study, 316L stainless steel feedstock was exploited as the material for fabricating thick cylindrical specimens with ad iameter of 20 mm. Regarding the aforementioned thick specimens, injection at the normal velocity of 15 cm 3 s -1 resulted in critical defects, such as folding, weld lines and porosity. It was found that these defects were eliminated in the specimens injected at velocities as low as 1cm 3 s -1 .U nder such conditions, however, due to the increase in the injection time, the flow front rapidly solidifies with ensuing dramatic deterioration of component surface quality. Furthermore, the present study proposes an ovel method, entitled inserted metal injection molding, with a double aim both for removing the jetting phenomenon and the consequent defects in injected components and for making the injection process possible at normal velocities allowing fabrication of the components with high surface quality.A. Safarian, Ç. Karataş: The impact of injection velocity on the defects in thick components fabricated by IMIM Int. J. Mater. Res.( formerly Z. Metallkd.) 106 (2015) 66 49 Fig. 3. Sintered specimens and microscopic views of their surfaces injected at 1cm 3 s -1 (left) resulting in low surface quality, and injected at 15 cm 3 s -1 (right) resulting in high surface quality.

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Section: Resultssupporting

confidence: 81%

The impact of injection velocity on the defects in thick components fabricated by inserted metal injection molding

Safarian

Karataş

2015

International Journal of Materials Research

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“…Success of micro technology will depend both on the utilization of a broad range of polymeric, metallic and ceramic materials as well as the utilization of cost-effective process technology (Hesselbach et al 2003;NN 2004). Micro injection moulding, which has already achieved high precision standards for polymers, should be a very promising process technology to meet these requirements (Heckele and Schomburg 2004;Heldele et al 2006). However processing of ceramic and metallic feedstocks of high abrasiveness in micro powder injection moulding requires mould inserts with increased wear resistance compared to those used in plastic injection moulding (Bonson and Beenders 2003).…”

Section: Introductionmentioning

confidence: 99%

Mechanical structuring, surface treatment and tribological characterization of steel mould inserts for micro powder injection moulding

et al. 2008

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Manufacturing of ceramic and metallic micro components in micro powder injection moulding (lPIM) requires mould inserts offering high wear resistance and a sufficient demoulding behaviour. Within the frame of this research lPIM mould inserts made from low and high alloyed tool steel were structured by micro milling and finished by micro peening and ultrasonic wet peening. Influence of surface condition on wear and demoulding behaviour of the steels in lPIM with ceramic feedstock was characterized using a laboratory tribotester simulating powder injection moulding and a specially adapted static friction tester. Results indicate that performance of mould inserts in micro powder injection moulding depends not only on hardness, surface condition and homogeneity of the mould insert materials but also is strongly influenced by the characteristics of the feedstock, like composition of the binder or amount and hardness of the ceramic particles.

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“…To provide a material suitable for injection molding, fine ceramic or metallic powders are compounded with a binder to a so called feedstock. By variation of powders, powder content and binder composition the feedstock can be adjusted to the requirements of micro powder injection molding (Heldele et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Ceramic micro parts produced by micro injection molding: latest developments

et al. 2009

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Powder injection molding is a preferred technology for the production of micro parts or microstructured parts. Derived from the well known thermoplastic injection molding technique it is suitable for a large-scale production of ceramic and metallic parts without final machining. To achieve good surface quality and control the part size and distortions is an important goal to allow mass production. This means that all process steps like part design adjusted for MIM/CIM-technology, appropriate choice of powder and binder components and injection molding simulation to design the sprue are required. Concerning the injection molding itself high quality mold inserts, high-precision injection molding with suitable molding machines like Battenfeld Microsystem50 or standard machine with special equipment like variotherm or evacuation of the molding tool and an adjusted debinding and sintering process have to be available. Results of producing micro parts by powder injection molding of ceramic feedstock will be presented.

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Micro powder injection molding: process characterization and modeling

Cited by 33 publications

References 17 publications

The impact of injection velocity on the defects in thick components fabricated by inserted metal injection molding

The impact of injection velocity on the defects in thick components fabricated by inserted metal injection molding

Mechanical structuring, surface treatment and tribological characterization of steel mould inserts for micro powder injection moulding

Ceramic micro parts produced by micro injection molding: latest developments

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