Microstructure and mechanical properties of hydroxyapatite thin films grown by RF magnetron sputtering

Nelea, Valentin; Morosanu, C.; Iliescu, M.; Mihăilescu, I. N.

doi:10.1016/s0257-8972(03)00729-1

Cited by 138 publications

(72 citation statements)

References 17 publications

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“…However, the plasma-sprayed apatite coating is known to be inhomogeneous in structure and to hold stress and even cracks due to the high-temperature processing and thick coating layer [2,3]. As alternative coating techniques, sol-gel method [4,5], biomimetic immersion [6], electrochemical deposition [7], sputtering [8,9], ion-beam deposition [10], and electron-beam (e-beam) evaporation [11,12] have been developed.…”

Section: Introductionmentioning

confidence: 99%

Improvement in crystallinity of apatite coating on titanium with the insertion of CaF2 buffer layer

Lee

Kim

2007

J Mater Sci: Mater Med

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In the apatite coatings on Ti the heat treatment process is necessary to crystallize the apatite structure for improved chemical stability and biological properties. However, the heat treatment normally degrades the mechanical strength of the coating layer associated with thermally induced stress. In this study, we aimed to improve the crystallization of apatite coating by using calcium fluoride (CaF 2 ) as a buffer layer. The insertion of a thin layer of CaF 2 (0.2-1 lm) between apatite and Ti significantly improved the crystallization behavior of apatite. Moreover, this crystallization was more enhanced as the thickness of CaF 2 was increased. When a 1 lm-thick CaF 2 was inserted, the crystallization of apatite initiated at a temperature as low as 320°C, being a dramatic improvement in the crystallization when considering the crystallization initiation temperature of a bare apatite coating on Ti was *450°C. As a result of this crystallization enhancement, the dissolution behavior of CaF 2 -inserted apatite coatings was more stable than that of the bare apatite coating, showing much reduced initial-burst effect. Preliminary cellular assay showed the CaF 2 -inserted apatite coating provided a substrate for cells to spread and grow favorably, as being similar to the bare apatite coating. This novel way of apatite coating on Ti using CaF 2 buffer layer may be useful in the coating systems particularly requiring low temperature processing and increased crystallinity with high chemical stability.

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Section: Introductionmentioning

confidence: 99%

Improvement in crystallinity of apatite coating on titanium with the insertion of CaF2 buffer layer

Lee

Kim

2007

J Mater Sci: Mater Med

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“…19 HAP coating of orthopedic implants can be an effective method of improving their physiological response leading to an overall improved performance of the implants. 20 HAP coatings can be deposited on a metallic substrate using techniques such as direct laser melting, sol-gel, and vapor deposition processes, JOM, Vol. 69, No.…”

Section: Introductionmentioning

confidence: 99%

“…This article is an open access publication including plasma spraying, which is a commercially viable technique for clinical applications. [20][21][22][23][24][25][26][27] Nevertheless, HAP coatings produced by plasma-spray bond poorly with metal substrate and are a candidate to easy wear and tear, which results in undesirable debris formation. 28 Synthesizing a composite layer with HAP on the implant surface is one way to solve these problems.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite Coatings on High Nitrogen Stainless Steel by Laser Rapid Manufacturing

Das

Shukla

2017

JOM

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In this research, the laser rapid manufacturing (LRM) additive manufacturing process was used to deposit multifunctional hydroxyapatite (HAP) coatings on high nitrogen stainless steel. LRM overcomes the limitations of conventional coating processes by producing coatings with metallurgical bond, osseointegration, and infection inhibition properties. The microstructure, microhardness, antibacterial efficacy, and bioactivity of the coatings were investigated. The microstructure studies established that the coatings consist of austenite dendrites with HAP and some reaction products primarily occurring in the inter-dendritic regions. A Vickers microhardness test confirmed the hardness values of deposited HAP coatings to be higher than those of the bare 254SS samples, while a fluorescence activated cell sorting test confirmed their superior antibacterial properties as compared with pristine samples. The coated samples immersed in simulated body fluid showed rapid apatite forming ability. The results obtained in this research signify the potential application of the LRM process in synthesizing multifunctional orthopaedic coatings.

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“…HA is widely coated on orthopaedic implants because its mechanical properties closely resemble to those of human bones and it is also biocompatible with human bone tissues [14]. HA coating of orthopaedic implants can be an effective method of improving the physiological response of the implant surface leading to an overall improved performance of the implants [15].…”

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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Microstructure and mechanical properties of hydroxyapatite thin films grown by RF magnetron sputtering

Cited by 138 publications

References 17 publications

Improvement in crystallinity of apatite coating on titanium with the insertion of CaF2 buffer layer

Improvement in crystallinity of apatite coating on titanium with the insertion of CaF2 buffer layer

Hydroxyapatite Coatings on High Nitrogen Stainless Steel by Laser Rapid Manufacturing

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

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