Mechanical behaviour of nanolayer hydroxyapatite (HA) coating developed through superplastic embedment of titanium (Ti) alloy (Ti 6Al 4V)

Khalid, Haris M.; Hasan, Siti Nur; Jauhari, Iswadi

doi:10.1016/j.matchemphys.2016.04.032

Cited by 4 publications

(5 citation statements)

References 23 publications

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“…In this study, the as-received Ti-6Al-4V substrates were solution-treated prior to the embedment process. Since the heat treatment results are similar to previous studies [22][23][24][27][28][29], the evaluation is not discussed here. Figure 4 represents the stress versus strain curves obtained from the SPE and SPD processes.…”

Section: Resultsmentioning

confidence: 80%

“…In our previous study, an HA layer with good bonding strength was successfully produced when HA was superplastically embedded into Ti-6Al-4V alloy. The superplastically deformed titanium substrate can strongly support the embedded HA layer [22,[26][27][28][29]. Other studies on this subject indicate that the superplastically embedded HA layer remains strongly intact on the substrate surface even after the substrate is further deformed (SPD) at high temperatures without HA structure deterioration [23,24].…”

Section: Bioactivity and Mechanical Stability Of Ti-6al-4v Implants Smentioning

confidence: 96%

“…Obviously, the HA peaks significantly increased after implantation. This is due to the formation of newly grown HA on the HA layers after implantation [24,29,37]. The peaks increased with the growth of newly grown HA layers.…”

Section: Spe and Spd: Morphology And Ha Layer Stabilitymentioning

confidence: 97%

“…Results from the in vitro study of the HA layer after SPE and SPD suggest that newly formed apatite layers can grow within a week of immersion in simulated body fluid (SBF). The HA layer can also withstand a relatively high load applied to the surface [24,29] However, the performance of SPE and SPD implants in an in vivo condition has not yet been studied. Therefore, in this work, SPE and SPD samples are implanted subcutaneously on the backs of SD rats in order to evaluate their performance in vivo.…”

Section: Introductionmentioning

confidence: 99%

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Bioactivity and mechanical stability of Ti–6Al–4V implants superplastically embedded with hydroxyapatite in rats

et al. 2017

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In this in vivo study, Sprague Dawley (SD) rats were used to investigate the bioactivity as well as the microstructural and mechanical properties of Ti-6Al-4V samples embedded with hydroxyapatite (HA) using two different coating methods-superplastic embedment (SPE) and superplastic deformation (SPD). The HA layer thickness for the SPE and SPD samples increased from 249.1 ± 0.6 nm to 874.8 ± 13.7 nm, and from 206.1 ± 5.8 nm to 1162.7 ± 7.9 nm respectively, after 12 weeks of implantation. The SPD sample exhibited much faster growth of newly formed HA compared to SPE. The growth of the newly formed HA was strongly dependent on the degree of HA crystallinity in the initial HA layer. After 12 weeks of implantation, the surface hardness value of the SPE and SPD samples decreased from 661 ± 0.4 HV to 586 ± 1.3 HV and from 585 ± 6.6 HV to 425 ± 86.9 HV respectively. The decrease in surface hardness values was due to the newly formed HA layer that was more porous than the initial HA layer. However, the values were still higher than the substrate surface hardness of 321 ± 28.8 HV. Wear test results suggest that the original HA layers for both samples were still strongly intact, and to a certain extent the newly grown HA layers also were strongly bound with the original HA layers. This study confirms the bioactivity and mechanical stability of the HA layer on both samples in vivo.

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Section: Resultsmentioning

confidence: 80%

Section: Bioactivity and Mechanical Stability Of Ti-6al-4v Implants Smentioning

confidence: 96%

Section: Spe and Spd: Morphology And Ha Layer Stabilitymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Bioactivity and mechanical stability of Ti–6Al–4V implants superplastically embedded with hydroxyapatite in rats

et al. 2017

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“…In the 2010s, however, this technique was significantly improved. Namely, the injection temperature was increased to between 875 • C and 925 • C, the pressure was increased to 60.3 MPa [616] or a strain rate of 1 × 10 −4 s −1 was applied [617][618][619], and the particle size of CaPO 4 was reduced below 10 µm. These modifications resulted in the formation of continuous CaPO 4 deposits 10-25 µm thick with good adhesion properties.…”

Section: Implantation Into the Surface Of Superplastic Alloysmentioning

confidence: 99%

There Are over 60 Ways to Produce Biocompatible Calcium Orthophosphate (CaPO4) Deposits on Various Substrates

Dorozhkin

2023

J. Compos. Sci.

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A The present overview describes various production techniques for biocompatible calcium orthophosphate (abbreviated as CaPO4) deposits (coatings, films and layers) on the surfaces of various types of substrates to impart the biocompatible properties for artificial bone grafts. Since, after being implanted, the grafts always interact with the surrounding biological tissues at the interfaces, their surface properties are considered critical to clinical success. Due to the limited number of materials that can be tolerated in vivo, a new specialty of surface engineering has been developed to desirably modify any unacceptable material surface characteristics while maintaining the useful bulk performance. In 1975, the development of this approach led to the emergence of a special class of artificial bone grafts, in which various mechanically stable (and thus suitable for load-bearing applications) implantable biomaterials and artificial devices were coated with CaPO4. Since then, more than 7500 papers have been published on this subject and more than 500 new publications are added annually. In this review, a comprehensive analysis of the available literature has been performed with the main goal of finding as many deposition techniques as possible and more than 60 methods (double that if all known modifications are counted) for producing CaPO4 deposits on various substrates have been systematically described. Thus, besides the introduction, general knowledge and terminology, this review consists of two unequal parts. The first (bigger) part is a comprehensive summary of the known CaPO4 deposition techniques both currently used and discontinued/underdeveloped ones with brief descriptions of their major physical and chemical principles coupled with the key process parameters (when possible) to inform readers of their existence and remind them of the unused ones. The second (smaller) part includes fleeting essays on the most important properties and current biomedical applications of the CaPO4 deposits with an indication of possible future developments.

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Plasma Spray Deposition of HA-TiO2 on β-phase Ti-35Nb-7Ta-5Zr Alloy for Hip Stem: Characterization of Bio-mechanical Properties, Wettability, and Wear Resistance

2020

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Mechanical behaviour of nanolayer hydroxyapatite (HA) coating developed through superplastic embedment of titanium (Ti) alloy (Ti 6Al 4V)

Cited by 4 publications

References 23 publications

Bioactivity and mechanical stability of Ti–6Al–4V implants superplastically embedded with hydroxyapatite in rats

Bioactivity and mechanical stability of Ti–6Al–4V implants superplastically embedded with hydroxyapatite in rats

There Are over 60 Ways to Produce Biocompatible Calcium Orthophosphate (CaPO4) Deposits on Various Substrates

Plasma Spray Deposition of HA-TiO2 on β-phase Ti-35Nb-7Ta-5Zr Alloy for Hip Stem: Characterization of Bio-mechanical Properties, Wettability, and Wear Resistance

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