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:
In this article, two original studies of the alumina as porous substrate and PLD (pulsed laserdeposition) thin films in view of its biomedical and tribological applications are presented.The first biomedical study aimed to evaluate the role of Al2O3 on thin deposited nanostructures. Forthis purpose, cerium stabilized zirconia doped hydroxyapatite thin films were deposited by PLDonto high purity, high density alumina substrates with different low porosities. For deposition, anUV KrF* (λ=248 nm, τ ~ 25 ns) excimer laser was used for the multi-pulse irradiation of the targets.The nanostructured surface morphologies of the thin films with micro droplets were evidenced byatomic force microscopy and scanning electron microscopy and the compositions with a Ca/P ratioof 1.7 by energy dispersive spectroscopy. The films were seeded with mesenchymal stem cells for invitro tests. The cells showed good attachment and spread and covered uniformly the surface of thesamples. Different functions of substrate porosities are observed in the efficiency of developing longfilopodia and of obtaining the optimal intracellular organization.The second study aimed to understand the influence of micro-structural and mechanicalcharacteristics on the tribological behaviour of stainless steel samples with PLD alumina coatingsproduced using an UV KrF* (λ=248 nm, τ ~ 20 ns) excimer laser and a sintered alumina target.Various microscopic observation techniques were used in order to connect the tribological responseto the amorphous microstructure of the coatings. The results correspond to the determination of themechanical characteristics by nanoindentation tests, scratch tests, and a tribological behaviouranalysis of the treated steel against 100Cr6. The films were stoichiometric, partially crystallizedwith an amorphous matrix and their surfaces had few particulates deposited on. The obtained valuesof hardness and elastic modulus of the films were in good agreements with literature data
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.384.185.pdf
Permalink
