Binder Jetting is a 3D printing process where a liquid bonding agent selectively binds regions of a powder bed.
Binder Jetting is a similar 3D printing technology to SLS, with the requirement for an initial layer of powder on the build platform. But unlike SLS, which uses a laser to sinter powder, Binder Jetting moves a print head over the powder surface depositing binder droplets which are typically 80 microns in diameter. These droplets bind the powder particles together to produce each layer of the object.
Once a layer has been printed, the powder bed is lowered and a new layer of powder is spread over the recently printed layer. This process is repeated until a complete object is formed.
The object is then left in the powder to cure and gain strength. Afterwards, the object is removed from the powder bed and any unbound powder is removed using compressed air.
Types of 3D Printing Technology: Binder Jetting (BJ).
Materials: Sand or metal powder: Stainless / Bronze, Full color sand, Silica (sand casting).
Dimensional Accuracy: ±0.2 mm (metal) or ±0.3 mm (sand).
Common Applications: Functional metal parts; Full color models; Sand casting.
Strengths: Low-cost; Large build volumes; Functional metal parts.
Weaknesses: Mechanical properties not as good as metal powder bed fusion.
Metal Binding Jetting (BJ)
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