Additive manufacturing
Powder, feedstock, spreading, deposition, and reuse behavior
across additive manufacturing
Powder beds, bound feedstocks, slurries, sand
and reclaimed material are not one category
Particle size, shape, oxygen content, moisture, cohesion, apparent density, surface condition,
rheology, electrostatic charging, binder distribution, and reuse history decide whether a feedstock
feeds evenly, spreads into a flat layer, deposits a stable track, holds green strength, and sinters
to the density you designed for. This page connects what you are seeing on the machine to the
mechanism behind it and the measurement that settles it.
Find your route
Start with the feedstock, then the behavior
Additive manufacturing feedstocks do not behave as one category. Pick the powder, bound feedstock, slurry, composite, sand, construction mix or reclaimed material class, then the behavior you are seeing in the process. The result names the mechanisms worth separating, the measurement to start with, and where in the process it usually shows up. It is a triage route, not a diagnosis.
- 1Material
- 2Behavior
- 3Route
Step 1 What are you handling?
Step 2 What are you seeing?
Step 3 Your route
Material routes
Powders, bound feedstocks, slurries and reclaimed streams
Additive manufacturing uses spherical and irregular metal powders, polymer powders, powder-loaded filaments and pellets, ceramic particles, printable slurries, composite feedstocks, sand systems, cementitious mixes and reclaimed streams with very different sizes, densities, shapes, surface chemistries, moisture sensitivities, thermal behaviors and rheologies. The same site may handle several feedstock forms and printing routes. Each class has its own behavior profile, so the most useful route starts with the feedstock before moving to the visible symptom or process instability.
Laser powder-bed fusion metal feedstocks
Laser powder-bed feedstocks require controlled size, sphericity, oxygen, and flow. Fines, satellites, and reuse affect spreading, fusion, porosity, and finish.
Electron-beam powder-bed fusion feedstocks
Electron-beam feedstocks must spread under vacuum and heat. Charge behavior, preheating, size distribution, and reuse affect raking, fusion, and defects.
Binder-jetting metal powder feedstocks
Binder-jetting powders rely on packing, wetting, and binder distribution. Particle size, shape, moisture, and layer density influence strength and sintering.
Directed-energy deposition powder feeds
DED powders must feed through nozzles into the melt pool. Size, sphericity, carrier gas, and segregation affect deposition rate and track quality.
Cold-spray and solid-state powder feeds
Cold-spray powders depend on velocity, shape, oxide condition, and hardness. Size distribution and surface state affect deposition efficiency and particle bonding.
Polymer powder-bed fusion feedstock powders
Polymer powder-bed feedstocks must spread, melt, and recrystallize within a narrow window. Aging, moisture, shape, and fines affect curl, density, and reuse.
Bound-metal filament and pellet feedstocks
Bound-metal feeds combine metal powder with polymer binder. Powder loading, dispersion, moisture, and thermal history influence extrusion, debinding, and shrinkage.
Ceramic powders and printable slurry materials
Ceramic AM feedstocks need controlled loading and dispersion. Particle size, agglomeration, binder chemistry, and drying affect shaping, cracking, firing.
Composite and filled polymer powders
Filled polymer feeds combine matrix material with fibers, minerals, or conductive particles. Dispersion, viscosity, segregation, and abrasion directly affect final print quality.
Sand and mold-printing feedstocks
Printed sand systems depend on grain size, shape, binder distribution, and moisture. Recoat behavior and curing affect permeability, strength, accuracy.
Cementitious construction feedstocks
Construction-printing mixes require pumpability, buildability, and controlled setting. Packing, moisture, admixtures, and shear history affect extrusion stability.
Reclaimed and recycled AM feedstocks
Reclaimed feedstocks change through oxidation, contamination, attrition, and size drift. Screening, blending, and reuse limits affect consistency and final quality.
Quick comparison
Material route, common risk, first measurement
The same symptom points to different mechanisms depending on the feedstock form, particle morphology, binder system, surface condition, atmosphere and printing route. This is the fast bridge between additive manufacturing behavior and the most useful first measurement route.
Additive manufacturing feedstock routes, the handling or processing risk each one carries most often, and the measurement worth running first.
| Material route | Common handling or processing risk | Useful first measurement |
|---|---|---|
| Laser powder-bed fusion metal feedstocks | Poor spreading, fines accumulation, satellite particles, oxidation, and reuse-related drift | Particle size, morphology, oxygen content, and flowability |
| Electron-beam powder-bed fusion feedstocks | Charging, unstable raking, preheat sensitivity, and vacuum-related flow variation | Particle size, morphology, charge behavior, and apparent density |
| Binder-jetting metal powder feedstocks | Poor packing, uneven binder wetting, low green strength, and sintering distortion | Particle size, packing density, moisture, and wetting behavior |
| Directed-energy deposition powder feeds | Unstable nozzle feeding, segregation, inconsistent deposition rate, and track variation | Particle size, morphology, flow rate, and carrier-gas response |
| Cold-spray and solid-state powder feeds | Poor acceleration, oxidation, variable deposition efficiency, and weak particle bonding | Particle size, morphology, oxide condition, and hardness |
| Polymer powder-bed fusion feedstocks | Poor recoating, moisture uptake, thermal aging, curl, and inconsistent reuse | Particle size, moisture, thermal behavior, and flowability |
| Bound-metal filament and pellet feedstocks | Inconsistent powder loading, poor dispersion, moisture, and extrusion instability | Powder loading, moisture, dispersion, and melt-flow behavior |
| Ceramic powders and printable slurries | Agglomeration, unstable rheology, drying cracks, and firing defects | Particle size, solids loading, dispersion, and rheology |
| Composite and filled polymer feedstocks | Filler segregation, abrasive wear, unstable extrusion, and property variation | Filler content, dispersion, moisture, and melt-flow behavior |
| Sand and mold-printing feedstocks | Poor recoating, uneven binder distribution, low strength, and dimensional error | Grain size, moisture, flowability, and binder distribution |
| Cementitious construction feedstocks | Pumping instability, poor buildability, premature setting, and layer collapse | Particle packing, rheology, setting time, and moisture |
| Reclaimed and recycled AM feedstocks | Oxidation, contamination, size drift, agglomeration, and inconsistent reuse performance | Particle size, oxygen, contamination, and flowability |
One risk per row is the one most often reported, not the only one that occurs. Use the selector above to work a specific combination through to a route.
Recurring problems
Start from the behavior you can see
These eight are the ones your own route card and continue block already name: flow, consolidation, dust, dosing, segregation, oxidation, contamination and spreading or deposition instability. Spreading earns a card here that it gets on no other hub, because a layer that does not lie flat turns every other property into a defect. Each card runs back to the mechanisms worth separating and forward to the measurement that confirms which one is governing.
Also covered: electrostatics, attrition, bridging & arching, adhesion. All symptoms
Measurement routes
The test that answers your question
Additive manufacturing behavior rarely resolves to one number. Particle size, morphology, satellites, oxygen content, moisture, cohesion, apparent density, electrostatic behavior, binder response and contamination can all sit behind the same visible process symptom. Pick the method by the question, not by the symptom.
Process routes
Where the behavior actually shows up
The same feedstock behaves differently depending on where it sits in the process. Production, classification, storage, conveying, dosing, spreading, deposition, binding, curing, debinding, sintering and recovery each expose a different property and a different failure mode.
Go deeper
Guides and articles for additive manufacturing feedstocks
Longer reads that work through the mechanisms behind these routes, from the visible process problem to material properties, measurement choice and interpretation.
FAQ
Additive manufacturing feedstock questions
Need the measurement, not just the guidance? PowderTechnology.info works closely with Delft Solids Solutions,
a contract research organization specializing in the physical behavior of powders and granules. DSS provides
contract testing and characterization, with its laboratory working in accordance with ISO 17025.
Contact Delft Solids Solutions.
