Suspension plasma sprayed bioactive glass coatings: Effects of processing on microstructure, mechanical properties and in-vitro behaviour

Cattini, Andrea; Łatka, Leszek; Bellucci, Devis; Bolelli, Giovanni; Sola, Antonella; Lusvarghi, Luca; Pawłowski, Lech; Cannillo, Valeria

doi:10.1016/j.surfcoat.2012.10.076

Cited by 54 publications

(51 citation statements)

References 27 publications

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“…However the appearance of this peak takes place at longer time than that observed for the DR 63 feedstocks, as seen in figure 2. This finding agrees with recent observations reported in the literature with regard to bioglass coatings obtained by APS [29]. According to this research, which took place with different glass compositional range (without Na2O) the overall reaction mechanism observed in SBF immersion, especially in the first days of immersion, is strongly affected by the microstructure and degree of crystallinity of the coatings.…”

Section: Coating Characterisationsupporting

confidence: 92%

45S5 bioactive glass coatings by atmospheric plasma spraying obtained from feedstocks prepared by different routes

et al. 2014

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Abstract45S5 bioactive glass powders with the following composition: 45 wt% SiO2, 6 wt% P2O5, 24.5 wt% CaO and 24.5 wt% Na2O were melted and quenched in water to obtain a frit. The frit was milled using two different routes: dry milling followed by sieving to obtain glass particles, and wet milling followed by spray drying to obtain a powder comprising porous agglomerates. All feedstocks showed adequate characteristics that make them suitable to be deposited by atmospheric plasma spraying. The powders and coatings were characterised by field-emission gun environmental scanning electron microscope and X-ray diffraction. The roughness and the contact angle of the coatings were also determined. The bioactivity of the powders and coatings was assessed by immersion in Simulated Body Fluid. It was found that bioactive glass prepared from bioglass frit by dry milling exhibited similar bioactivity as that of a commercial bioactive glass. All coatings produced showed good adhesion to the substrate as well as suitable surface properties to ensure efficient contact with body fluid. Regardless the characteristics of the feedstocks or plasma spray conditions used, all coatings were exclusively made up of an amorphous phase. On the other hand micrographs revealed that the characteristics of the feedstock strongly impact on the final coating microstructure. The most homogeneous microstructure was obtained when the feedstock was prepared by fine dry grinding of the frit. For this coating the formation of a bioactive layer was also proved by Fourier transform infrared spectroscopy and X-ray diffraction.

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Section: Coating Characterisationsupporting

confidence: 92%

45S5 bioactive glass coatings by atmospheric plasma spraying obtained from feedstocks prepared by different routes

et al. 2014

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“…However, very limited numbers of papers have dealt with obtaining BG coatings by SPS technique. This research has shown that the microstructure of SPS-BG coatings is characterised by a two-zone feature: one zone associated with well-molten particles which result in dense and flat areas and another agglomerated zone made up of fine and partially sintered grains [15]. Bolelli et al have also confirmed these microstructure features of SPS-BG coatings whereas at the same time these authors highlight the significant differences of SPS and APS coating microstructures [16].…”

Section: Introductionmentioning

confidence: 72%

“…In addition, coatings microstructure is composed of a twozone feature, i.e. a first layer made up of fine agglomerated and rounded drops partially sintered and a top zone formed by molten particles which result in dense and flat areas [15].…”

Section: Bioactive Glass Coatingsmentioning

confidence: 99%

Bioactive glass coatings by suspension plasma spraying from glycolether-based solvent feedstock

Cañas

Vicent

Orts

et al. 2017

Surface and Coatings Technology

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Bioactive glasses are emerging as a substitute of hydroxyapatite in the development of bioactive coatings for biomedical applications. The deposition of these coatings is carried out by a wide range of methods, being atmospheric plasma spraying the most employed technique. However, the research on the deposition of these coatings from suspension feedstocks by thermal spraying is still incipient, therefore more research about this topic is needed.Thus, a bioactive glass suspension, composed of fine glass particles, was prepared and stabilised through rheological and sedimentation tests to be used as a feedstock in plasma spraying. The solvent used in the suspension preparation was dipropylene glycol methyl ether in order to develop a new type of bioactive suspension. Consequently, as a new type of solvent was used, its effect on the plasma torch properties was determined. On other hand, the rheological behaviour of the suspension feedstock was assessed by means of a simple viscosity model. This suspension was deposited onto metallic substrates by plasma spraying, employing several spraying distances. All coatings displayed a suitable adherence and similar thickness.However, the microstructure of the obtained coatings is highly affected by the spraying distance as it can be seen in coatings surface and cross-section field emission gun environmental scanning electron microscopy examination. Thus, a relation between the spraying distance and coatings microstructure was found. On the other hand, X-ray diffraction confirmed the amorphous nature of the obtained coatings.

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“…The BGCaMIX glass (composition: 47.3 mol% SiO 2 , 45.6 mol% CaO, 2.3 mol% K 2 O, 2.3 mol% Na 2 O, and 2.6 mol% P 2 O 5 ) was prepared by a melt-quenching route as previously reported [21,30,31]. Briefly, the commercial raw powder reagents -all reagent grade -(SiO 2 , Na 2 CO 3 , CaCO 3 , K 2 CO 3 , Ca 3 (PO 4 ) 2 by Carlo Erba Reagenti, RodanoMilano, Italy) were mixed in a laboratory shaker for 2 h and then melted at 1450 ∘ C for 1 h. The molten BGCaMIX was then quenched in water to obtain a frit which was dried at 110 ∘ C for 12 hours.…”

Section: Glass and Composites Preparationmentioning

confidence: 99%

Bioglass and bioceramic composites processed by Spark Plasma Sintering (SPS): biological evaluation Versus SBF test

Bellucci¹,

Salvatori²,

Cannio³

et al. 2018

Biomedical Glasses

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Abstract:The biocompatibility of hydroxyapatite (HA), a lab-made bioglass (BGCaMIX) with high crystallization temperature and different HA/BGCaMIX composites, produced by Spark Plasma Sintering (SPS), was tested with respect to murine osteocytes both by direct and indirect tests, in order to also investigate possible cytotoxic effects of the samples' extracts. Previous investigations demonstrated that the samples' bioactivity, evaluated in a simulated body fluid solution (SBF), increased with the increasing amount of BGCaMIX in the sample itself. Although none of the samples were cytotoxic, the findings of the biological evaluation did not confirm those arising from the SBF assay. In particular, the results of direct tests did not show an enhanced "biological performance" of materials with higher glass content. This finding may be due to the high release of ions and particulate from the glass phase. On the contrary, the performance of the BGCaMIX alone is better for the indirect tests, based on filtered samples' extracts. This work further demonstrates that, when considering bioglasses and HA/bioglass composites, the results of the SBF assays should be interpreted with great care, making sure that the results arising from direct contact tests are integrated with those arising from the indirect ones.

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Suspension plasma sprayed bioactive glass coatings: Effects of processing on microstructure, mechanical properties and in-vitro behaviour

Cited by 54 publications

References 27 publications

45S5 bioactive glass coatings by atmospheric plasma spraying obtained from feedstocks prepared by different routes

45S5 bioactive glass coatings by atmospheric plasma spraying obtained from feedstocks prepared by different routes

Bioactive glass coatings by suspension plasma spraying from glycolether-based solvent feedstock

Bioglass and bioceramic composites processed by Spark Plasma Sintering (SPS): biological evaluation Versus SBF test

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