Abstract
New methacrylate-based feedstocks have been developed according to fulfil the requirements of the micro powder injection moulding process chain, consisting of compounding, moulding and thermal post-processing for the realization of dense and warpage-free ceramic or metal parts. The different feedstock systems, consisting of polymethylmethacrylate (PMMA) as major binder component and microsized zirconia or stainless steel filler, were prepared by reactive compounding. The individual components—PMMA, solved in its monomer methylmethacrylate (MMA), additives and fillers—were mixed in a dissolver stirrer under ambient conditions and subsequently polymerized to a thermoplastic feedstock. Prior to injection moulding the mixtures’ flow properties were characterized by high pressure capillary rheometry as function of the composition, solid load and shear rate. After replication the obtained test specimen were debinded and sintered using optimized temperature programs. The achieved specimen densities reach 99% of the theoretical possible value for zirconia and 98.7% in case of stainless steel 17-4PH.
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Acknowledgments
The authors thank the Deutsche Forschungsgemeinschaft (DFG) for financial support within the Collaborative Research Centre SFB 499. This work was done in the framework of the Ceramics Interest Group in the non-profit 4M-Association (http:\\www.4m-association.org).
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Hanemann, T., Honnef, K., Müller, T. et al. New methacrylate-based feedstock systems for micro powder injection moulding. Microsyst Technol 17, 451–457 (2011). https://doi.org/10.1007/s00542-011-1243-9
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DOI: https://doi.org/10.1007/s00542-011-1243-9