Dimensional variation in production of high-aspect-ratio micro-pillars array by micro powder injection molding |
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| Authors: | SG Li G Fu I Reading SB Tor NH Loh P Chaturvedi SF Yoon K Youcef-Toumi |
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| Institution: | (1) Singapore–MIT Alliance, N2-B2C-15, 50 Nanyang Avenue, Singapore, 639798, Singapore;(2) Precision Measurements Group, Singapore Institute of Manufacturing Technology, Singapore, Singapore;(3) School of Mechanical & Aerospace Engineering, Nanyang Technology University, Singapore, Singapore;(4) School of Electrical & Electronic Engineering, Nanyang Technology University, Singapore, Singapore;(5) Dept. of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA |
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| Abstract: | Micro powder injection molding (μPIM) is one of the potential processes for the mass production of metallic microstructures
and micro components. Here, μPIM is the miniaturization of conventional PIM, which involves four processing steps: mixing,
injection molding, debinding and sintering. This paper looks into the feasibility and effectiveness of μPIM as a key mass
production process for the fabrication of metallic micro components. For it to be an effective re-production process, it is
imperative to examine how well parts can be duplicated/fabricated from a master mold. In this work, the dimensional variation
of high-aspect-ratio micro-pillars arrays, in particular the dimensional shrinkage, global warpage, and surface roughness
at each stage of the μPIM process for a range of molding pressures, are quantified and compared in detail. The sensitivity
of the dimensional variation of the microstructures to the packing pressure is reported. The mechanism behind the dimensional
variation is analyzed.
PACS 81.20.Ev; 81.20.Hy; 81.70.Fy; 07.60.Ly; 81.05.-t |
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