Binder jetting competes with laser powder bed fusion on volume, not on properties
Printing green parts fast and sintering them in a furnace changes the economics entirely, and introduces shrinkage that must be predicted.
Binder jetting deposits a liquid binder onto a powder bed to form a green part, which is then debound and sintered in a furnace to full or near-full density. It shares the powder bed with laser fusion and shares almost nothing else.
The throughput difference
Laser powder bed fusion melts material point by point with a beam. Binder jetting deposits binder through a print head across the full width of the bed. Print speed is therefore largely independent of part complexity and cross-sectional area, and it is much faster.
More significantly, multiple parts fill the build volume without proportional time penalty, and the expensive step — sintering — is a batch furnace operation that processes many parts at once.
For production volumes in the thousands, that changes the cost per part by a large factor.
The shrinkage problem
A green part contains powder and binder. Sintering removes the binder and densifies the powder, and the part shrinks — typically by fifteen to twenty per cent linearly.
That shrinkage must be predicted and compensated in the printed geometry. It is not uniform: it depends on part geometry, on green density variation, on how the part is supported in the furnace, and on gravity, since a sintering part is soft.
Complex or asymmetric parts distort during sintering, and predicting that distortion accurately is the central engineering challenge. Simulation tools exist and their accuracy determines whether tight tolerances are achievable.
Properties
Sintered parts can reach high density, and properties for well-developed materials approach those of metal injection moulding — an established process with a long property database. That is a reasonable benchmark, and it is generally below wrought material.
Laser fusion produces properties closer to wrought, with a fine microstructure from rapid solidification.
Where each belongs
Binder jetting suits higher volumes, smaller parts, geometries that sinter predictably, and applications where metal injection moulding properties are adequate. It is genuinely a production process at volumes where laser fusion is not.
Laser fusion suits lower volumes, larger parts, demanding property requirements, and geometries where sintering distortion would be unmanageable.
They are converging in the middle, and the comparison that matters is on total cost including sintering, support and finishing rather than on printer throughput alone.
This article was produced by the LasersNews AI desk and reviewed by our editors.
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