Microceramic Injection Molding

Bauer, Werner; Haußelt, J.; Merz, L.; Müller, Marcus; Örlygsson, Gissur; Rath, S.

doi:10.1002/9783527616725.ch12

Cited by 9 publications

(8 citation statements)

References 29 publications

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“…There are two variants of ceramics injection molding, the widely used high-pressure injection molding (HPIM) process (Piotter et al 2001) and the less common low-pressure injection molding (LPIM) process. While the potential of high-pressure injection molding lies in cost-effective mass production, low-pressure injection molding is predestined for the fast manufacturing of small production lots Bauer et al 2005). One reason for the positioning of HPIM for mass production is the high costs associated with the manufacturing of the molds.…”

Section: Manufacturing By Ceramic Injection Moldingmentioning

confidence: 99%

Design and prototyping of a ceramic micro turbine: a case study

et al. 2009

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Within the framework of the Collaborative Research Center 499 (SFB 499) of the German Research Foundation (DFG), one task was the development of a zirconia micro turbine as a demonstrator tool to enhance the interaction of the participating workgroups. This case study describes the evolution of the demonstrator and experiences gained with the design and the manufacturing of a micro device. Although it was not the aim of this basic research project to develop a commercial product, the experiences are valuable for improving the performance of industrial product development processes for ceramic micro devices. The various parts of the zirconia micro turbine were prepared by a rapid prototyping process chain (RPPC) that allows for a fast and inexpensive manufacturing of ceramic parts with details down to the micron range. A first design concept was made to mainly demonstrate the shaping feasibility of the process in the micro range. However, some features affected the performance due to their low loading capacity. Thus, a modified design was improved for power output and durability. After optimization of the process chain, dense and homogenous ceramic micro parts could be manufactured. These parts were used for the assembling of a functional micro turbine demonstrator, which was powered by compressed air.

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Section: Manufacturing By Ceramic Injection Moldingmentioning

confidence: 99%

Design and prototyping of a ceramic micro turbine: a case study

et al. 2009

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“…In principle, HPIM and LPIM are closely related shaping methods. At first view, the only difference between them consists in the binder system, as LPIM uses solely paraffin or wax-based binders without the addition of thermoplastic materials (Bauer et al 2005). However, this modification has severe consequences on all processing steps, from the mixing of the feedstock to the sintering of the parts.…”

Section: Low-pressure Powder Injection Mouldingmentioning

confidence: 99%

“…Hence, they are not compatible with this kind of feedstock. Commercial LPIM machines are of much simpler design, since there is no need for high pressures (Bauer et al 2005). Moreover, they are not equipped with an advanced control system.…”

Section: Low-pressure Powder Injection Mouldingmentioning

confidence: 99%

Powder injection moulding of metallic and ceramic micro parts

et al. 2011

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Industrial use of micro components is determined by the availability of efficient manufacturing techniques. While micro injection moulding of plastic is common practice, metal and ceramic powder injection moulding (PIM) still is under development. High-pressure and low-pressure injection moulding methods complement each other ideally, covering the entire spectrum from prototype to large-scale production. With high-pressure PIM, micro gear wheels with diameters \300 lm can be fabricated using LIGA mould inserts. Densities between 97 and 99% of the theoretical values are achieved. Apart from oxide ceramics, metal materials like copper or powder metallurgical steels like 17-4PH or 316L are often applied. Multi-component injection moulding requires less mounting steps and, hence, offers decisive advantages for effective production of interesting material combinations like electrically conductive/insulating or hard/ductile. Studies relating to the fabrication of immobile as well as mobile shaft-wheel components were performed. Other activities focussed on in-mould labelling with foils containing ultrafine particles to improve surface quality and detail accuracy. Low-pressure injection moulding allows for the manufacture of small series within 1-4 weeks at low cost. However, the process has features which are not compatible with high-pressure PIM. Although use of a low-viscous feedstock is associated with various benefits, low-pressure injection moulding has not met with acceptance in micro moulding.

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“…1,5,6 In this study, the behaviour of zirconia-paraffin feedstocks used for LPIM of ceramic microcomponents was investigated. The main focus of this paper lies on the influence of dispersant concentration, storage time and working temperature on the rheological properties.…”

Section: Introductionmentioning

confidence: 99%