Chemical gradient in plasma-sprayed HA coatings

Wen, Jiqiu; Leng, Yang; Chen, Jiyong; Zhang, Chenge

doi:10.1016/s0142-9612(99)00273-2

Cited by 70 publications

(47 citation statements)

References 5 publications

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“…25,34) The ''flake-type'' regions were examined to be amorphous with micro-Raman spectroscopy and nanoindentation techniques. 35) After post-deposition heat treatment, such microstructure of plasma-sprayed coatings were improved. It seems that change in porosity can be deduced from SEM pictures between as-sprayed and crystallized coatings.…”

Section: Phase Composition and Microstructurementioning

confidence: 99%

“…21,44) Many studies claimed that the coatings adjacent to substrate have more amorphous phase. 8,35) When heattreated at higher temperature such as 700 C, the regions near the substrate may result in a larger amount of cracks caused by the large volume shrinkage during the crystallization and phase transformation, in turn, detrimental to the bonding strength of the coating, although possessing a higher crystallinity. Hence, in this work, the differences in the bonding strengths can be explained in terms of the stress relief and microstructure changes.…”

Section: Bond Strengthmentioning

confidence: 99%

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Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Chen

Ding

2006

Mater. Trans.

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Bioactive hydroxyapatite (HA)-coated implants plasma sprayed on Ti6Al4V substrates have been widely used in load-bearing applications because of their biocompatibility and their intimate contact with bone. The improvement of the characteristics of HA coatings is concerned. The purpose of this work was to evaluate corrosion behavior and bond strength of HA coatings after post-deposition heat treatment at 500-700 C. The results indicated that the heat treatment led to recrystallization of amorphous calcium phosphate of as-sprayed HA coatings. The reduction of layer defects associated with plasma-sprayed coatings and the enhancement of the resistance to corrosion took place after heat treatment. Bond strength of the heat-treated coatings was sensitive to the treatment temperature. It is concluded that the heat treatment at 600C for 1 h in air, endowing with increased crystallinity and the reduced defects without significantly reduced bond strength, provided a better corrosion protection than the other two treatment temperatures.

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Section: Phase Composition and Microstructurementioning

confidence: 99%

Section: Bond Strengthmentioning

confidence: 99%

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Chen

Ding

2006

Mater. Trans.

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“…HA coatings can be deposited on a metallic substrate using various techniques, such as direct laser melting, sol-gel, electro deposition, dip coating, ion beam, pulsed laser deposition and various other vapor deposition processes, including plasma spray which is a commercially viable technique for clinical applications [15][16][17][18][19][20][21][22]. Plasma spraying produces bioactive ceramic coatings with high adhesion strength, but this technique also has many demerits such as chemical in-homogeneity and variable crystalline nature of coating [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Plasma spraying produces bioactive ceramic coatings with high adhesion strength, but this technique also has many demerits such as chemical in-homogeneity and variable crystalline nature of coating [16][17][18]. The Magnetron Sputtering (MS) technique has emerged as an alternative to the aforesaid methods owing to its flexibility of depositing a variety of materials.…”

Section: Introductionmentioning

confidence: 99%

Surface morphology andin vitrobioactivity of biocompatible hydroxyapatite coatings on medical grade S31254 steel by RF magnetron sputtering deposition

Das

Shukla

2017

Transactions of the IMF

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Hydroxyapatite (HA) is popularly used as a bio-compatible coating material for metallic implants, in view of its improved bone fixation property, leading to an increased life of the implant. However, the deposition of HA on medical grade UNS S31254 stainless steel (SS254) for orthopaedic implant applications by the radio-frequency magnetron sputtering technique is unreported in the literature so far. The surface morphology of deposited HA coatings was characterized using Scanning Electron Microscopy and Atomic Force Microscopy, while their phase composition was determined using X-ray Diffraction. The thickness and adhesive strength of the HA coatings were determined using an Ellipsometer and a Tensometer, respectively. Finally, the antibacterial efficacy and bioactivity of the deposited coatings were confirmed using Fluorescence Activated Cell Sorting and Immersion test in Simulated Body Fluid environment. The obtained results showed that the HA coatings grown on SS254 using magnetron sputtering possess desirable surface properties as well as adhesion and biocompatibility properties, ideally suited for potential applications in orthopaedic implants.

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“…For example, etching and other types of surface treatments can provide the implant with a nanotopography, improving cell adhesion, and with functional groups catalysing biomineralization [3,4]. Although these treatments have led to a significant improvement in osteointegration, their clinical performance is still limited by the implant destabilization caused by either partial metal/bone bonding or coating delamination [4,5].…”

Section: Introductionmentioning

confidence: 99%

Osteoconductive phosphoserine-modified poly(ε-lysine) dendrons: synthesis, titanium oxide surface functionalization and response of osteoblast-like cell lines

Meikle

Bianchi²,

Olivier

et al. 2013

J. R. Soc. Interface.

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The lack of direct bonding between the surface of an implant and the mineralized bony tissue is among the main causes of aseptic loosening in titaniumbased implants. Surface etching and ceramic coatings have led to improved osteointegration, but their clinical performance is still limited either by partial bonding or by coating delamination. In this work, a solid-phase synthesis method has been optimized to produce poly(1-lysine) dendrons, the outermost branching generation of which is functionalized by phosphoserine (PS), a known catalyst of the biomineralization process. The dendrons were deposited onto etched titanium oxide surfaces as a near-to-monolayer film able to induce the formation of a homogeneous calcium phosphate phase in a simulated body fluid over 3 days. The dendron films also stimulated MG63 and SAOS-2 osteoblast-like cells to proliferate at a rate significantly higher than etched titanium, with SAOS-2 also showing a higher degree of differentiation over 14 days. PS-tethered dendron films were not affected by various sterilization methods and UV treatment appeared to improve the cell substrate potential of these films, thus suggesting their potential as a surface functionalization method for bone implants.

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Chemical gradient in plasma-sprayed HA coatings

Cited by 70 publications

References 5 publications

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Effect of Heat Treatment on Characteristics of Plasma Sprayed Hydroxyapatite Coatings

Surface morphology andin vitrobioactivity of biocompatible hydroxyapatite coatings on medical grade S31254 steel by RF magnetron sputtering deposition

Osteoconductive phosphoserine-modified poly(ε-lysine) dendrons: synthesis, titanium oxide surface functionalization and response of osteoblast-like cell lines

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