Feasibility of using low pressure cold gas spray for the spraying of thick ceramic hydroxyapatite coatings

This article deals with the production of thick ceramic hydroxyapatite coatings obtained by Low Pressure Cold Gas Spray (LPCGS) system. Several factors such as powder microstructure, surface roughness and cold gas spray system are here discussed in the build‐up process. The use of nanocrystalline po...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2019-01, Vol.16 (1), p.221-229
Main Authors: Vilardell, Anna M., Cinca, Núria, Dosta, Sergi, Cano, Irene G., Guilemany, Josep M.
Format: Article
Language:English
Subjects:
additive manufacturing
Agglomerates
Ceramic coatings
Cold
Cold gas
Cold pressing
Crystallites
deposition
Heat treatment
Hydroxyapatite
Low pressure
low pressure cold gas spray
Microstructure
Physicists
Realignment
Spraying
Substrates
Surface roughness
Surface treatment
Thermomechanical analysis
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Summary:This article deals with the production of thick ceramic hydroxyapatite coatings obtained by Low Pressure Cold Gas Spray (LPCGS) system. Several factors such as powder microstructure, surface roughness and cold gas spray system are here discussed in the build‐up process. The use of nanocrystalline powder composed by fine agglomerates and needle‐like shape microstructure allows the realignment and compaction of individual crystallites to form thick deposits. In addition, the activation of the substrate surface results convenient for the first impinging particles anchored properly. Then, layer by layer, particles can remain attached leading to coating build‐up. Additionally, the use of low shock pressure as well as constant feeding system provided by LPCGS system lead to homogeneous coatings in comparison with High Pressure Cold Gas Spray (HPCGS) system. The successful coating build‐up has been achieved not only by the use of an agglomerated feedstock powder, but also by previous surface treatment and the use of the low pressure system. The obtaining of HA components by LPCGS is promising within biomedical field. An improvement of component strength is also suggested by means of thermomechanical analysis of the powder. The performance of a post heat‐treatment leads to an increase in HA strength, as well as crystal size.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.13088