2. High Value Manufacturing
Density/porosity control of sintered 316L stainless steel
parts shaped by additive manufacturing
15-11-2012
le centre collectif de l’industrie technologique belge
4. Porous metallic parts
• Shaping by powder metallurgy lots of parameters
• Porosity range from a few % to 90%
• Application list:
• Filtration
• Distributing/dispersing/damping
• Airing/cooling
• Lightening
• Catalysts supports
• Prosthesis
• But simple geometries (Pressing, MIM)
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5. Porous metallic parts
• Additive manufacturing no limit in shape + integrated
functionalities
• SLM 1 step
no control of porosity
• 3D-printing indirect route: shaping + sintering
possibility to control porous characteristics
R10:
1000x500x280mm RXD:
60x40x15mm
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7. Sintering cycle
• From a powder tap to full dense material
• Passing by porous state
• Opened to 92% density, then closed
• Evolution functions of:
• Initial state
• Packing density
• Particle size distribution
• Particle shape
• Sintering conditions
• Temperature
• Time
• (Atmosphere)
• Stop at different stage to keep or eliminate porosity following
target application
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12. Examples
Ø 70mm
Pores 30µm
Perméa. 10-12 m²
L 270mm
Ø 50mm Pores 17µm
Pores 30µm Perméa. 5.10-13 m²
L 30mm
Perméa. 10-12 m²
Ø 300mm
L 90mm
Pores 35µm
Pores 35µm
Perméa. 10-12 m²
Perméa. 10-12 m² 12
13. Thank you for your attention !
Bruno.Verlee@sirris.be
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