ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The aim of this study was to create a nano-structured coating using Plasma ThermalSpraying (PTS). This process consists in introducing pre-agglomerated nanosized particles in ahigh-temperature and high-velocity gas jet and projected them onto the substrate to form, layer bylayer, a nanostructured coating. In order to retain nanometer grain sizes in the deposited coatingthrough specific PTS technologies, a thermal field and velocity distribution in the plasma jet areanalytically calculated. A finite element analysis is employed to calculate the thermal fieldevolution inside the agglomerated particles and the thermal induced internal stress distribution isdetermined. The parameters determined by the theoretical analysis are used for experimentalcoatings. The average crystallite size of nano-hydroxyapatite powder was 90nm. After deposit viaPlasma Thermal Spraying (PTS) process and followed by a 2 hours heat treatment to reduceamorphous fraction, the experimental deposited coating shows that it retains the nanometercrystallite sizes. The substructure of nanocrystals was evaluated at about 120nm in size. Such ananocoating may play the role of nucleation site to bone, allowing a faster stabilization of theimplant
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.745.pdf
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