Optimization of Degreasing-Sintering Process for Mg 2 Si/PLA Mixture and Influences of Additive Amount of Al on Sintered
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MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.87
Optimization of Degreasing-Sintering Process for Mg2Si/PLA Mixture and Influences of Additive Amount of Al on Sintered Density and Thermoelectric Performance of Mg2Si Fabricated by the Optimized Process Takashi Itoh1* and Takumi Nakano2 1
Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University, Furo-Cho, Chikusa-Ku, Nagoya 464-8603, Japan 2
Department of Physical Engineering, School of Engineering, Nagoya University, Furo-Cho, Chikusa-Ku, Nagoya 464-8603, Japan *
Corresponding author: [email protected]
ABSTRACT Fused deposition modelling (FDM) type of 3D printing is widely used for manufacturing complex shaped polymer products. Recently, the metal/polymer composite products can be made by 3D printer using metal/polymer composite filament. Now, we are planning to develop a new manufacturing process of the thermoelectric (TE) elements or modules by combining the FDM-type 3D printing and the degreasing-sintering process. In this work, we focused on the degreasing-sintering process of the mixture of Mg2Si and polylactic acid (PLA) powders. Mg2Si compound powder was synthesized by a liquid-solid phase reaction (LSPR) method. The powder mixtures of Mg2Si, Al and PLA were pressed and heated in a pulse discharge sintering (PDS) chamber under a vacuum in various degreasing conditions. Following the degreasing, the sintering of Mg2Si was carried out in the same PDS chamber at various starting sintering temperatures. Sintered density, Seebeck coefficient and electrical resistivity of the consolidated Mg2Si were measured and the power factor as a TE performance was estimated from the TE properties. The optimum conditions of degreasing-sintering process maximizing the sintered density and the TE performance of Al-doped Mg2Si were investigated. Furthermore, the influences of the additive amount of Al on the sintered density and the TE performance of Mg2Si fabricated via the optimized degreasing-sintering process were investigated.
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INTRODUCTION The fused deposition modeling (FDM) type of 3D printer [1] that is formed by laminating thermoplastic resin filaments while being melted is attracting attention as an easy means of modeling. The FDM-type 3D printing has the advantage of being able to print multiple materials simultaneously, depending on the printer model. Recently, the modeling using metal composite filaments consisting of the metal powder and the thermoplastic resin is also possible. The metal composite filaments, i.e. copper, bronze, magnetic iron, steel, etc., have become commercially available for the FDM-type 3D printing. Furthermore, wood [2], carbon fiber [3], nano-graphite [4], carbon nanotube [5] and graphene [6,7] have been studied as the composite fil
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