Flame Spray Deposition of Titanium Alloy-Bioactive Glass Composite Coatings

Nelson, Greg; Nychka, John A.; McDonald, André

doi:10.1007/s11666-011-9674-5

Cited by 24 publications

(4 citation statements)

References 29 publications

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“…As it has been extensively reported in the literature the bands at ~580 cm -1 and ~610 cm -1 correspond to bending of PO4 3-groups which indicate the apatite formation in SBF [18,22]. Thus, for BG STD sample these bands are visible at 2 days, for DR 63 powder at 3 days and finally for WR sample at 5 days.…”

Section: Feedstock Characterisationsupporting

confidence: 57%

“…Thus in the bioglass coatings obtained in this research the amorphous structure of the feedstocks is preserved regardless the plasma spraying conditions used. As reported elsewhere high cooling rates are necessary to prevent recrystallisation and to obtain amorphous phase provided that the plasma torch temperature overcomes the recrystallisation point of the bioactive glass (650-700 ºC) [22]. As the diffractograms reveal, these conditions were achieved by the plasma deposition in all the experiments.…”

Section: Feedstock Characterisationsupporting

confidence: 55%

“…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. Other previous research highlighted the impact of 11 the coating microstructure, in particular the pore interconnectivity, on the osteointegration [22].…”

Section: Coating Characterisationmentioning

confidence: 97%

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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: Feedstock Characterisationsupporting

confidence: 57%

Section: Feedstock Characterisationsupporting

confidence: 55%

Section: Coating Characterisationmentioning

confidence: 97%

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

et al. 2014

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“…Some studies have even explored the use of nanostructured yttria-stabilized zirconia as a top coat for a multi-layered environmental barrier coating system for the boiler tubes [26]. However, due to the high operating temperatures (3,500-10,000 • C) of the thermal spray processes [29][30][31], and possible formation of detrimental cracks and delamination of the final coating, these coatings may not be suitable for all substrate materials and practical conditions. In addition, there is a real challenge to apply thermal spraying techniques for protection of the inner surface of long tubing, as well as the components with complex shapes.…”

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confidence: 99%

Corrosion Resistance of Boronized, Aluminized, and Chromized Thermal Diffusion-Coated Steels in Simulated High-Temperature Recovery Boiler Conditions

et al. 2018

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In this study, the high-temperature molten salt corrosion resistance of bare steels and steels with protective coatings, fabricated by thermal diffusion processes (boronizing, aluminizing and chromizing), were investigated and compared. Surface engineering through thermal diffusion can be used to fabricate protective coatings against corrosion, while alleviating issues around possible cracking and spallation that is typical for conventional thermal-sprayed coatings. In this regard, samples of low carbon steel and 316 stainless steel substrates were boronized, chromized, and aluminized through a proprietary thermal diffusion process, while some of the samples were further coated with additional thin oxide and non-oxide layers to create new surface architectures. In order to simulate the actual corrosion conditions in recovery boilers (e.g., from black liquor combustion), the surfaces of the samples sprayed with a modeling salt solution, were exposed to low-temperature (220 • C) and high-temperature (600 • C) environments. According to microstructural and X-ray diffraction (XRD) studies and results of hardness determination, the coatings with multilayered architectures, with and without additional oxide layers, showed successful resistance to corrosive attack over bare steels. In particular, the samples with boronized and chromized coatings successfully withstood low-temperature corrosive attack, and the samples with aluminized coatings successfully resisted both low-and high-temperature molten salt corrosive attacks. The results of this study conducted for the first time for the thermal diffusion coatings suggest that these coatings with the obtained architectures may be suitable for surface engineering of large-sized steel components and tubing required for recovery boilers and other production units for pulp and paper processing and power generation.2 of 36 materials and process features, low-melting temperature ash or smelt is produced. The produced smelt mainly consists of different salts, e.g., sodium and potassium chlorides, sulfates, and carbonates. At elevated temperatures, mostly greater than 500 • C, the aforementioned salts in certain combination likely become molten. In the presence of oxygen, the molten salts can be highly corrosive [2,3]. Combustion of the black liquor fuel also results in the formation of hot corrosive gases, such as SO 2 , CO 2 , Cl 2 , and some others [5].Generally, high-temperature black liquor corrosion occurs according to two main mechanisms, namely (i) high-temperature active oxidation and (ii) corrosion due to the formation of sulfidic and chlorine gasses and residual deposits of molten salts and their interaction with the steel surface [6]. In the former mechanism, which generally occurs in high temperatures (above 450 • C), the anions of the molten salt, such as chlorides (Cl − ), sulfates (SO 4 2− ) and sulfides (S 2− ), continuously diffuse into the oxide-metal interface and actively sustain the oxidation. On the other hand, in the latter mechanism, the presence of the an...

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