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Laser sintering of nano-hydroxyapatite coated polyamide 12 powders

Hui, D.; Goodridge, Ruth D.; Scotchford, Colin; Grant, David M.

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D. Hui

Professor of Additive Manufacturing

Professor of Materials Science


As part of a larger study on the laser sintering (LS) of nano-composite structures for biomedical applications, a wet mixing method was used to coat Polyamide 12 (PA12) particles with nano-hydroxyapatite (nHA). The addition of nHA significantly affected powder processability due to laser absorption and heat transfer effects which led to part warping. This phenomenon has not been reported in other studies investigating LS of polymer/HA and nHA powders. Nano-composites containing 0.5–1.5 wt% nHA were successfully produced and tensile testing showed that 0.5 wt% nHA provided the greatest reinforcement with a 20% and 15% increase in modulus and strength respectively. However, the elongation at break had significantly declined which was likely due to the formation of nHA aggregates at the sintering borders following the processing of the coated powders despite being initially well dispersed on the particle surface.

Journal Article Type Article
Acceptance Date May 29, 2018
Online Publication Date May 30, 2018
Publication Date Aug 30, 2018
Deposit Date Jul 26, 2018
Publicly Available Date Mar 4, 2019
Journal Additive Manufacturing
Print ISSN 2214-8604
Electronic ISSN 2214-8604
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 22
Pages 560-570
Public URL
Publisher URL


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