Journal article
Compositionally graded hydroxyapatite/tricalcium phosphate coating on Ti by laser and induction plasma
Acta biomaterialia, Vol.7(2), pp.866-873
2011
Handle:
https://hdl.handle.net/2376/104696
PMID: 20854939
Abstract
In this study we report the fabrication of compositionally graded hydroxyapatite (HA) coatings on Ti by combining laser engineering net shaping (LENS™) and radio frequency induction plasma spraying processes. Initially, HA powder was embedded in the Ti substrates using LENS™, forming a Ti–HA composite layer. Later, RF induction plasma spraying was used to deposit HA on these Ti substrates with a Ti–HA composite layer on top. Phase analysis by X-ray diffraction indicated phase transformation of HA to β-tricalcium phosphate in the laser processed coating. Laser processed coatings showed the formation of a metallurgically sound and diffused substrate–coating interface, which significantly increased the coating hardness to 922
±
183
Hv from that of the base metal hardness of 189
±
22
Hv. In the laser processed multilayer coating a compositionally graded nature was successfully achieved, however, with severe cracking and a consequent decrease in the flexural strength of the coating. To obtain a structurally stable coating with a composition gradient across the coating thickness a phase pure HA layer was sprayed on top of the laser processed single layer coatings using induction plasma spray. The plasma sprayed HA coatings were strongly adherent to the LENS™–TCP coatings, with adhesive bond strength of 21
MPa. In vitro biocompatibility of these coatings, using human fetal osteoblast cells, showed a clear improvement in cellular activity from uncoated Ti compared with LENS™–TCP-coated Ti and reached a maximum in the plasma sprayed HA coating.
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Details
- Title
- Compositionally graded hydroxyapatite/tricalcium phosphate coating on Ti by laser and induction plasma
- Creators
- Mangal RoyVamsi Krishna BallaAmit BandyopadhyaySusmita Bose
- Publication Details
- Acta biomaterialia, Vol.7(2), pp.866-873
- Academic Unit
- Mechanical and Materials Engineering, School of
- Publisher
- Elsevier Ltd
- Identifiers
- 99900546522601842
- Language
- English
- Resource Type
- Journal article