Research Progress and Prospects of Key Problems in Metal Powder-bed Binder Jetting
Recently,metal powder-bed binder jetting(MPBJ)has the problems of low green density,binder mismatch and densification difficulty.In order to address these problems,the current status of powder spreading is firstly summarized in terms of raw material characteristics,powder spreading mechanism,and numerical simulation.Subsequently,the type of binder,its role with the powder bed and the residue problem are elaborated.Optimizing the binder system,limiting the residue,are all beneficial to the performance of the binder jet-formed metal parts.Sintering and immersion infiltration are common densification methods,during which deformation and precision control need to be considered,in addition to post-treatment methods such as hot isostatic pressing and solution aging are usually required to further regulate the pore and phase composition of the parts.Finally,it is pointed out that high-precision,high-performance and difficult-to-form material printing is the future development trend.
metal powder-bed binder jettingpowder spreadingbinderdensification
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