Influence of annealing temperature on RF magnetron sputtered calcium phosphate coatings

Dijk, K. van; Schaeken, H. G.; Wolke, J.G.C.; Jansen, John A.

doi:10.1016/0142-9612(96)89656-6

Cited by 214 publications

(125 citation statements)

References 15 publications

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“…While bone compatibility is provided by the HA coating, the underlying metal possesses good ductility and strength. Deposition of HA coatings has been achieved by a number of methods, including plasma spraying [5][6][7] , ion implantation 8,9) , sputtering [10][11][12] , sol-gel coating [13][14][15] , biomimetic methods [16][17][18] , and electrophoretic deposition (EPD) [19][20][21] . Among these methods, EPD is a fairly rapid and inexpensive way of producing a dense and uniform coating on substrates even with complex geometries.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

2008

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The aim of this study was to evaluate hydroxyapatite (HA) coatings produced by dynamic voltage during electrophoretic deposition (EPD). Dynamic voltages from 0 to 200 V were incrementally applied in three interims. The as-deposited coating was sintered at 800°C and its properties evaluated. Structure and phase analyses of both as-deposited and sintered coatings were evaluated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The HA coatings obtained by dynamic voltage consisted of two layers. While the inner layer was dense and firmly attached to the substrate and contained fine HA particles, the outer layer was porous and contained bigger particles. Repeated deposition was applied to increase the thickness of the coatings. SEM analysis showed that these coatings were free of cracks. In addition, decomposition of HA coatings was not observed until 800°C.

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Section: Introductionmentioning

confidence: 99%

Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

2008

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“…and methods of depositing HA by sputtering etc. have been reported, but there are almost no scientifi c reports on whether or not products by these reported methods have a suffi cient component composition to be referred to as HA [19][20][21][22][38][39][40][41][42] . In addition to the above, analytical data for the HA coating has only been for the entire coating layer up to now, and almost no information other than SEM observations can be found that shows information limited to the surface directly in contact with the vital tissues.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, whether the principle advantage of HA coating is osteoconductivity or bone substitution depends on the report, and it appears that unifi cation of the theoretical basis has not yet been achieved. Various techniques have been devised and put to practical use as methods for coating the Ti base metal surface with HA [12][13][14][15][19][20][21][22][38][39][40][41][42] . But another issue with respect to HA implants is that the formation of a coating layer composed only of HA on the implant surface is diffi cult due to various technical problems.…”

Section: Discussionmentioning

confidence: 99%

AFM Observations and Composition Analyses of the Top Surfaces of HA Implants

Sugawara

2017

J. Hard Tissue Biology.

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From the perspective of excellent biocompatibility and osteoconductivity of hydroxyapatite (HA), the frequency of use of HA implants has been steadily increasing in recent years. But the coating layer of certain commercialized HA implants may not be primarily composed of HA, and it may be assumed that the coating layers, contained some HA components, are automatically categorized to the HA implant. The characteristics of the implant to vital tissues are attributable to the properties of the surface components of the implant. Scanning electron microscope (SEM) observations and X-ray diff raction (XRD) analyses of the HA coating have been performed previously, but SEM has some diffi culties in showing clear images of the HA crystal due to the infl uence of coating conditions etc., and the results obtained from XRD are not limited to the surface where contact with vital tissues, but also exhibit the inner components of the coating layer. Therefore, it might be assumed that reports limited to the top surface of the HA coating have still not been published. In this study, AFM observations, and XPS and micro-XRD analyses were performed on the top surface of fi ve commercially available HA implants. AFM results showed that HA crystals were clearly observed on the surface of two samples. XPS and micro-XRD analyses exhibited that HA was detected in all the samples, but other substances including Ti, TiO 2 , CaTiO 3 , etc., were also confi rmed in several samples. These results showed that HA was present on the top surface of all HA implants, and also indicated that all implants might exhibit some sort of biocompatibility and osteoconductivity due to their bioactive natures caused by HA.

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“…As a consequence, upon impingement of feedstock powders particles onto the implant surface, an adherent coating is formed due to partial or complete melting of the powder particles. Another physical technique that is often used to deposit strongly adherent HA onto implants is Radio Frequency (RF) magnetron sputtering ( Figure 2) [180][181][182][183][184]. Sputtering is a process whereby atoms or molecules of some materials are ejected in a vacuum chamber, becoming precursors for coating, due to bombardment with high-energy ions [31,185].…”

Section: Dry Deposition Techniquesmentioning

confidence: 99%

Surface Engineering for Bone Implants: A Trend from Passive to Active Surfaces

et al. 2012

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Abstract:The mechanical and biological properties of bone implants need to be optimal to form a quick and firm connection with the surrounding environment in load bearing applications. Bone is a connective tissue composed of an organic collagenous matrix, a fine dispersion of reinforcing inorganic (calcium phosphate) nanocrystals, and bone-forming and -degrading cells. These different components have a synergistic and hierarchical structure that renders bone tissue properties unique in terms of hardness, flexibility and regenerative capacity. Metallic and polymeric materials offer mechanical strength and/or resilience that are required to simulate bone tissue in load-bearing applications in terms of maximum load, bending and fatigue strength. Nevertheless, the interaction between devices and the surrounding tissue at the implant interface is essential for success or failure of implants. In that respect, coatings can be applied to facilitate the process of bone healing and obtain a continuous transition from living tissue to the synthetic implant. Compounds that are inspired by inorganic (e.g., hydroxyapatite crystals) or organic (e.g., collagen, extracellular matrix components, enzymes) components of bone tissue, are the most obvious candidates for application as implant coating to improve the performance of bone implants. This review provides an overview of recent trends and strategies in surface engineering that are currently investigated to improve the biological performance of bone implants in terms of functionality and biological efficacy. OPEN ACCESSCoatings 2012, 2 96

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Influence of annealing temperature on RF magnetron sputtered calcium phosphate coatings

Cited by 214 publications

References 15 publications

Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

Hydroxyapatite coating by electrophoretic deposition at dynamic voltage

AFM Observations and Composition Analyses of the Top Surfaces of HA Implants

Surface Engineering for Bone Implants: A Trend from Passive to Active Surfaces

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