Hydroxyapatite coatings prepared by a high power laminar plasma jet

Vilotijević, Miroljub; Marković, Petar; Zec, S.; Marinković, S.; Jokanović, Vukoman

doi:10.1016/j.jmatprotec.2010.12.018

Cited by 28 publications

(16 citation statements)

References 30 publications

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“…However, none of these processes produce "pull-off" strengths approaching flexural data for bulk HAp, with values ranging between about 10 MPa and 80 MPa [54,268]. The highest reported "pull-off" strengths of 60-80 MPa were produced using either a high power laminar jet coating method or vacuum deposition [268,272]. Shown in Fig.…”

Section: Strengthmentioning

confidence: 93%

“…The standards require that the "pulloff" adhesion strength be greater than 15 MPa, which is one-fourth to one-tenth of the reported flexural strengths for dense HAp. Different deposition practices have been explored to improve "pulloff" strengths, including plasma, induction, vacuum-aerosol and high velocity oxy-fuel combustion spraying, hot-isostatic pressing, dip coating, electrophoretic deposition, sol-gel adhesion, pulsedlaser, ion-beam, or co-spraying HAp with a toughening agent such as Al 2 O 3 , ZrO 2 , or a titanium alloy [268][269][270][271][272]. However, none of these processes produce "pull-off" strengths approaching flexural data for bulk HAp, with values ranging between about 10 MPa and 80 MPa [54,268].…”

Section: Strengthmentioning

confidence: 99%

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Ceramics and ceramic coatings in orthopaedics

McEntire

Bal

Rahaman

et al. 2015

Journal of the European Ceramic Society

188

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Section: Strengthmentioning

confidence: 93%

Section: Strengthmentioning

confidence: 99%

Ceramics and ceramic coatings in orthopaedics

McEntire

Bal

Rahaman

et al. 2015

Journal of the European Ceramic Society

188

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“…We suggest that efficiency of momentum transfer from the laminar plasma jet to HA particles during their heating is most probably responsible for shortening of particle residence time in the plasma [11]. This, in turn, leads to prevention of significant diffusion of water formed by HA decomposition outside of the particle, thus favouring crystalline HA formation upon recrystallisation.…”

Section: Composite Interfaces 281mentioning

confidence: 91%

Plasma coating of hydroxyapatite

Vilotijević¹

2012

Composite Interfaces

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Characteristics of the hydroxyapatite (HA) plasma coatings are directly related to the performances of the plasma jet used in the deposition process. Previous research within a plasma spray technique, based on the application of the conventional plasma gun (PG), suggested the use of lower power level of the PG, about 25 kW, in order to avoid significant chemical decomposition of HA occurring at higher powers. However, coatings obtained at this power level have a poor microstructure, resulting in their unsatisfactory cohesion/adhesion properties. In contrast to that, this study shows that good quality HA coatings can be produced in plasma obtained by plasma jet operated at high power level (52 kW) and in laminar flow mode. For two HA powders types, containing particles differing in mass by a factor of 20, a set of optimum deposition parameters has been defined leading to the coatings with high crystallinity (80-90%), excellent microstructure (porosity 1-2%) and high adhesion strength (60 and 40 MPa for the coating thicknesses of 120 and 350 μm, respectively). It has been shown that higher plasma power does not necessarily lead to a higher HA decomposition.

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“…Kolejny etap prowadzonych badań, dotyczący powłoki HAp, polegał na określeniu geometrii uzyskanej powierzchni, którą przedstawia rycina 6. Analizę przeprowadzono, wykorzystując techniki interferometryczne [28]. Powierzchnia powłoki HAp charakteryzuje się chropowatością i jest dość typowa dla stosowanej metody.…”

Section: Wynikiunclassified

Physical and mechanical properties of hydroxyapatite plasma sprayed materials applied in implantology

Makrenek

Belka

Żórawski

et al. 2018

Med Pr

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Wstęp: Przedmiotem badań była ocena fizykomechanicznych właściwości bioceramiki hydroksyapatytowej (HAp) natryskiwanej plazmowo na podłoże tytanowe typu Ti-grade 2 (CP-Ti). Ten sposób nanoszenia powłoki wykorzystywany jest w procesie nakładania warstw na implanty dla lepszego związania ich z tkanką kostną. Materiał i metody: W celu przeprowadzenia badania przygotowano hydroksyapatyt według technologii chemii mokrej przez wydzielenie z roztworu substancji w postaci stałej. Następnie opracowano podłoże tytanowe, na które naniesiono hydroksyapatyt techniką natryskiwania plazmowego. Wyniki: Przeprowadzone badania pozwalają stwierdzić, iż właściwości otrzymanej powłoki mogą być wykorzystywane do pokrycia dużych powierzchni implantów o dowolnym kształcie. Wnioski: Podczas badań dotyczących fizykomechanicznych parametrów hydroksyapatytowych powłok odnotowano, iż wykazują one wystarczające właściwości mechaniczne do stosowania w implantologii. Dalszym celem badań będzie właściwy dobór technologicznych parametrów natrysku powłok, który pozwoli zwiększyć adhezje i kohezje powłok HAp.

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Hydroxyapatite coatings prepared by a high power laminar plasma jet

Cited by 28 publications

References 30 publications

Ceramics and ceramic coatings in orthopaedics

Ceramics and ceramic coatings in orthopaedics

Plasma coating of hydroxyapatite

Physical and mechanical properties of hydroxyapatite plasma sprayed materials applied in implantology

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