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The aim of the paper is to propose the development of a MEX feedstock composed of a bio-sourced binder and a tool steel powder to be printed with a pellet printer. A bio-based feedstock with the highest powder load is made using different powder sizes. It is shaped into test samples with Fused Granulate Fabrication process, from where the polymer binder is then eliminated by thermal degradation. The resulting powder skeleton is densified by conventional sintering, to achieve a maximal density. The densified samples are examined by X-ray tomography for the evaluation of their internal porosity. The developed method permits to get, from optimised stages, final components with a high density of 97%, equivalent to that obtained using conventional PIM processes, with a dimensional shrinkage of 13%. The physicochemical composition of the densified components obtained is in line with the literature.
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Charpentier et al. (2024) studied this question.
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