Hydroxyapatite by SLS/M L. Ferrage 1S , D. Grossin 1S , B. Ben-Nissan - - PDF document

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Hydroxyapatite by SLS/M L. Ferrage 1S , D. Grossin 1S , B. Ben-Nissan - - PDF document

Sep 26, 2022 142 likes •262 views

3D laser printing of Hydroxyapatite by SLS/M L. Ferrage 1S , D. Grossin 1S , B. Ben-Nissan 2 , M. Healey 3 , M. Perez 3 2: 3: 1: S: Secondment - NEXT-3D Mid-term meeting, Brussels, Nov 24 th 2016 - 1 SLS/M HAP What phenomena are significant

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3D laser printing of Hydroxyapatite by SLS/M

  • NEXT-3D Mid-term meeting, Brussels, Nov 24th 2016 -
  • L. Ferrage1S, D. Grossin1S, B. Ben-Nissan2, M. Healey3, M. Perez3

1: 2: 3: S: Secondment

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SLS/M HAP

1) Flowability of powder Mobility from “powder supply” to “build platform” using Recoater

  • arm. (grain size, shape … )

2) Laser-powder Interaction Powder need to be melted or sintered (thermal properties of material, grain size, laser-mater interaction … )

What phenomena are significant in SLS/M ?

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interaction sintering Selected sintered area 1) 2) 3) 4) Laser

SLS/M HAP

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No interaction Strong support interaction spherical With hydroxyapatite and standard configuration Material decomposition Laser Or

SLS/M HAP

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  • T +

absorption

  • Ø +

absorption

Absorption VS grain size Absorption VS Temperature

  • Ø +

absorption

Absorption VS wavelength

How to increase absorption of Powder and decrease absorption of support ?

SLS/M HAP

6

labs

Core Reactive shell

Core-shell Nanostructuration

Power T(Préheating)

Laser Support

Doping

Process Material How to increase absorption of powder ?

SLS/M HAP

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  • Using different machines/lasers in order to sinter

ceramics

Oxides

SLS/M HAP

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Laser wavelength (CO2) : 10,6 µm Power max: 240 W Scanning speed: 50-5000 mm/s Support : Titanium or Stainless steel

SLS of Ceramic

EOS M250 XT – Laser CO2

BresMedical Ltd.

SLS/M HAP

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Hydroxyapatite powder Ca10(PO4)6(OH)2

50 µm < dparticules < 160 µm

SLS/M HAP

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Parameters:

  • Puissance laser
  • Scan speed
  • Layer Thickness
  • Hatch Distance
  • Lasing patterning
  • Support (Yes/No)
  • Multi-lasing (Yes/No)
  • Material (Powder/Support)

SLS/M HAP

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  • Movie

SLS/M HAP

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Parameters :

 TA6V support  [O2] gaz < 1,5 %  Support Temperature = 80ºC  Strategy « external supports »  Layer Thickness = 100 µm  Power = 85, 90 or 95% (204 à 228 W)  Scan speed = 80 or 100 mm/s

SLS/M HAP

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External supports ?  Lattice structures supports

SLS/M HAP

Decrease support absorption IP protections action(s)

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XRD powder:

5000 10000 15000 20000 10 20 30 40 50 60 70 80 90 2 Theta Poudre Teknimed

SLS/M HAP

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XRD sintered pellets: [best match = Ca4(PO4)2O]

SLS/M HAP

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Analyse Raman : (633nm) UTS 16

SLS/M HAP

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Analyse FTIR : (ATR) UTS 17

SLS/M HAP

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Top surface (Optical):

SLS/M HAP

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SEM, Top surface : 19

SLS/M HAP

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SEM, Fracture surfaces :

SLS/M HAP

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Conclusion :

 1st SLS samples of HAP without doping  Wavelength (CO2)= 10.6 µm  Strategy « external supports »  IP protection action  Optimization is required  1 Review article on 3DP of Ceramics

SLS/M HAP