Metal Binder Jetting (BJ3D) is an additive manufacturing process that builds parts in a composite metal that is 60% stainless steel and 40% bronze. Using a CAD file, a machine will 3D print a part cross-section by cross-section at 0.004” (0.1mm) layers by precisely depositing binder in a stainless steel powder bed. BJ3D uses 316L/Bronze, which is highly-corrosion resistant and easy to tap and post-machine.
After this stage, the part is “green” and very easy to damage while handling. The part is then placed in a furnace and infiltrated with bronze to replace the binder and fuse the powder particles together to create a fully dense and extremely tough part.
Design freedom may be limited due to the fact that parts are constructed from a bed of metal powder that must be able to clear, and parts will shrink when cooling. However, BJ3D typically has more design flexibility than Metal Laser Sintering (DMLS/SLM) because no support structure is required.
We’ve created some tips below with more information on how to make sure that your part is a great fit for binder jetting: