Post annealing effect on corrosion behavior, bacterial adhesion, and bioactivity of LVOF sprayed hydroxyapatite coating

Tiwari, Srikant; Mishra, S.B.

doi:10.1016/j.surfcoat.2020.126500

Cited by 21 publications

(12 citation statements)

References 45 publications

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“…The size of these spheroids increased under the heat treatment, suggesting an improvement in the coating compactness and a decrease of its porosity. Such a result was confirmed in other recent works [6,11]. On the other hand, this morphology is required in biomedical applications to ensure osseointegration and stability of the implant [24].…”

Section: Heat Treatment Effectsupporting

confidence: 81%

“…In addition, a high temperature promotes the formation of chemical bonds in a large atomic zone mixed at the interface between the coating and the substrate [33]. Tiwari et al [11] noticed a slight deformation in the interface film/substrate, which was probably related to the mismatch in the coefficient of thermal expansion between the substrate and HAP coating. This phenomenon contributed to an imperfect interface.…”

Section: Adhesion Behaviormentioning

confidence: 99%

“…Hence, HAP coating allows for new surface properties such as osteointegration and biocompatibility [6][7][8], which lead to an improvement in implant functionality. Several techniques have been developed for coating metal implants, including plasma spraying sputtering [2], sol-gel [5], electrophoretic deposition [9], magnetron sputtering [10], LVOF (Low-Velocity Oxyfuel) sprayed [11], and electrodeposition [12,13]. Among the various deposition processes, electrodeposition is widely used in the coating industry, and it is considered to be a simple, quick and lowcost technique.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, this method allows for the coating of substrates that have a complex shape or porous structure [14]. Many studies focus on the various methods used to obtain reliable HAP coatings [15,16], other active research investigate bioactivity [2,11], cytocompatibility, and antibacterial properties [17]. Although the HAP coating should be compatible with the tissue surrounding the implant, it also should possess good mechanical properties, high bonding strength and corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

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Nanomechanical Behavior, Adhesion and Corrosion Resistance of Hydroxyapatite Coatings for Orthopedic Implant Applications

et al. 2021

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The aim of this work was to investigate the nanomechanical, adhesion and corrosion resistance of hydroxyapatite (HAP) coatings. The electrodeposition process was used to elaborate the HAP coatings on Ti6Al4V alloy. The effect of hydrogen peroxide concentration H2O2 on the electrolyte and the heat treatment was studied. Surface morphology of HAP coatings was assessed, before and after heat treatment, by scanning electron microscopy associated with X-ray microanalysis (SEM-EDXS). Moreover, X-ray diffraction (XRD) was performed to identify the coatings’ phases and composition. Nanoindentation and scratch tests were performed for nanomechanical and adhesion behavior analysis. The corrosion resistance of the uncoated, the as-deposited, and the heat-treated coatings was investigated by electrochemical test. The obtained results revealed that, with 9% of H2O2 and after heat treatment, the HAP film exhibited a compact and homogeneous microstructure. The film also showed a crystal growth: stoichiometric hydroxyapatite (HAP) and β-tricalcium phosphate (β-TCP). After heat treatment, the nanomechanical properties (H, E) were increased from 117 ± 7 MPa and 24 ± 1 GPa to 171 ± 10 MPa and 38 ± 1.5 GPa respectively. Critical loads (LC1, LC2, and LC3) were increased from 0.78 ± 0.04, 1.6 ± 0.01, and 4 ± 0.23 N to 1.45 ± 0.08, 2.46 ± 0.14, and 4.35 ± 0.25 N (respectively). Furthermore, the adhesion strength increased from 8 to 13 MPa after heat treatment. The HAP heat-treated samples showed higher corrosion resistance (Rp = 65.85 kΩ/cm2; Icorr = 0.63 µA/cm2; Ecorr = −167 mV/ECS) compared to as-deposited and uncoated samples.

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Section: Heat Treatment Effectsupporting

confidence: 81%

Section: Adhesion Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanomechanical Behavior, Adhesion and Corrosion Resistance of Hydroxyapatite Coatings for Orthopedic Implant Applications

et al. 2021

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“…The presence of Fe 3 P, Fe 2 P, FeP, and Ca 9 Fe(PO 4 ) 7 was due to the reaction of Fe with HAP powder at high temperature and subsequently formation of these phases were occurred. The decomposition of HAP powder was occurred due to the high temperature involved in microwave assisted surface modifications process and the formation of amorphous tricalcium phosphate (α-TCP) phase was occurred [32]. From SEM micrographs, it has been observed that these phases were mainly formed in the inter-dendritic regions.…”

Section: Xrd Studymentioning

confidence: 99%

In situ surface modification of stainless steel with hydroxyapatite using microwave heating

Singh¹,

Bansal²,

Vasudev³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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The present work involves enhancing the biocompatibility of austenitic stainless steel (SS-316L) implants by changing its surface composition and morphology through the microwave hybrid heating (MHH) technique. The polished SS-316L alloy surface layer was modified with bioactive hydroxyapatite (HAP) powder by utilizing an Industrial microwave oven operated at 2.45 GHz and 1.1 kW. The modified layer of SS-316L alloy was characterized in terms of phase analysis, microstructure investigation, porosity analysis and apatite forming ability. The microstructural investigation revealed that the presence of austenite dendrites with HAP along with some reaction induced phases like Fe 3 P, FeP, and Fe 2 P mainly in the inter-dendritic regions of the modified layer of SS-316L alloy. The microhardness of modified layer was higher than that of the unmodified layer of SS-316L alloy. The modified layer exhibited porosity in the range of 2% to 3%. The in-vitro study performed in simulated body fluid (SBF) solution indicates that the microwave-assisted surface modified layer of SS-316L alloy exhibited an improved bioactivity. The SEM images indicate the formation of apatite layer in the modified layer of SS-316L alloy. The observed biological improvements in the microwave-assisted modified layer was due to the cladding induced changes in the surface morphology and surface chemistry of the SS-316L substrate material.

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Effects of Hydrogen Peroxide Concentration and Heat Treatment on the Mechanical Characteristics and Corrosion Resistance of Hydroxyapatite Coatings

Dhiflaoui

Dabaki

Zayani

et al. 2023

J. of Materi Eng and Perform

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Post annealing effect on corrosion behavior, bacterial adhesion, and bioactivity of LVOF sprayed hydroxyapatite coating

Cited by 21 publications

References 45 publications

Nanomechanical Behavior, Adhesion and Corrosion Resistance of Hydroxyapatite Coatings for Orthopedic Implant Applications

Nanomechanical Behavior, Adhesion and Corrosion Resistance of Hydroxyapatite Coatings for Orthopedic Implant Applications

In situ surface modification of stainless steel with hydroxyapatite using microwave heating

Effects of Hydrogen Peroxide Concentration and Heat Treatment on the Mechanical Characteristics and Corrosion Resistance of Hydroxyapatite Coatings

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