The current research focuses on the shaping of aluminum feedstock by micro powder hot embossing. This method includes a mixture of powder with binder material for feedstock preparation. Then, shaping is accomplished by embossing, debinding and sintering. Micro powder hot embossing can be interested in the fabrication of parts when small series production is intended. The embossing step, to provide the designed configuration, is challenging and carried out using an elastomer die and uniaxial compaction. We evaluated the shaping process using aluminum feedstock and two geometries with similar aspect ratios (micro-channel half-flanges and micro-wall half-reservoirs). The micro-channel, half-flanges and half-reservoirs configurations were shaped using elastomer die; the micro-wall configuration was attained by the application of metallic die. For each die, the processing conditions (temperature, compaction and holding time) and shaping steps were selected to ensure the replicability and homogeneity of the green parts. The green parts were thermally debound and successfully sintered at a relatively high sintering temperature in a low-pressure atmosphere. The sintered parts retained their shapes and showed shrinkage.
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Difference % = ((Weight Brown part − Theoretical weight) ÷ Theoretical weight) × 100
Theoretical weight = vol. Powder in part × Density Powder
vol. Powder in part = vol. Green part × Powder volume concentration in feedstock
vol. Green part = Weight Green part ÷ Density Feedstock
Density feedstock = (vol. Powder × Density Powder) + (vol. Binder × Density Binder).
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The authors would like to express their thanks to CEMUP (Centro de Materiais da Universidade do Porto) for assistance with SEM, and to IPN (Instituto Pedro Nunes) for IFM analyses.
This work was supported by the Fundação para a Ciência e a Tecnologia (FCT) [Grant Number PD-BD-52674 2014] and by FEDER funds through the program COMPETE-Programa Operacional Factores de Competitividade and by national funds through FCT [Project UID/EMS/00285/2019].
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Emadinia, O., Vieira, M.T. & Vieira, M.F. Micro Powder Hot Embossing of Aluminum Feedstock. J. of Materi Eng and Perform 29, 3395–3403 (2020). https://doi.org/10.1007/s11665-020-04869-9
- micro powder hot embossing