A New Alternative for Obtaining Nanocrystalline Bioactive Coatings: Study of Hydroxyapatite Deposition Mechanisms by Cold Gas Spraying

The present article is intended to study the deposition mechanisms of bioactive hydroxyapatite (HA) particles by means of Cold Gas Spraying (CGS). A comparison of the deposition on two different substrates (Ti6Al4V and Al7075T6) and different particle sizes is presented. Although this is a more spec...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2016-04, Vol.99 (4), p.1420-1428
Main Authors: Cinca, Núria, Vilardell, Anna M., Dosta, Sergi, Concustell, Amadeu, Garcia Cano, Irene, Guilemany, Josep Maria, Estradé, Sonia, Ruiz, Alicia, Peiró, Francesca
Format: Article
Language:English
Subjects:
AEROSOL DEPOSITION
Aluminum base alloys
BEHAVIOR
Biocompatibility
CERAMICS
CERMET
Coatings
Cold gas
Deposition
Ductility
Hydroxyapatite
Ion beams
Materials Engineering
Materialteknik
Nanocrystals
Protective coatings
ROOM-TEMPERATURE
Titanium base alloys
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Summary:The present article is intended to study the deposition mechanisms of bioactive hydroxyapatite (HA) particles by means of Cold Gas Spraying (CGS). A comparison of the deposition on two different substrates (Ti6Al4V and Al7075T6) and different particle sizes is presented. Although this is a more specific deposition technique for ductile materials, it is here shown that, in certain conditions, ceramic deposition is possible despite the inherent low ductility. The resulting internal structure and the features at the particle–substrate interface are discussed in view of Transmission Electron Microscopy examinations of a Focused Ion Beam lift‐out prepared sample. Mainly, under shock compressive loading, the porous sintered powder proceeds through pore collapse, fragmentation and densification as well as grain refinement. The process is described through different plastic mechanisms in ceramics. This opens a new alternative route to produce nanocrystalline HA coatings through a cost‐effective process.
ISSN:0002-7820
1551-2916
1551-2916
DOI:10.1111/jace.14076