Hydroxyapatite-Coated Magnesium-Based Biodegradable Alloy: Cold Spray Deposition and Simulated Body Fluid Studies

Noorakma, Abdullah C. W.; Hussain, Zuhailawati; Aishvarya, V.; Dhindaw, B. K.

doi:10.1007/s11665-013-0589-9

Cited by 65 publications

(30 citation statements)

References 20 publications

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“…Examples include CS of hydroxyapatite (HA) for biomedical applications -pure HA [212,213], HA mixed with titanium [214] or doped with silver [215] -and titania as photoelectrodes [216][217][218][219][220]. In most cases, the thickness of the deposited material is limited to a monolayer of particles.…”

Section: Ceramics and Compositesmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

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Cold spraying is a solid-state powder deposition process with several unique characteristics, allowing production of coatings or bulk components from a wide range of materials. The process has attracted much attention from academia and industry over the past two decades.The technical interest in cold spraying is twofold: first as a coating process for applications in surface technology, and second as a solid-state additive manufacturing process, offering an alternative to selective laser melting or electron beam melting methods. Moreover, cold spraying can be used to study materials behaviour under extremely high strain rates, high pressures and high cooling rates. The cold spraying process is thus considered to be relevant for various industrial applications, as well as for fundamental studies in materials science.This article aims to provide an overview of the cold spray process, the current understanding of the deposition mechanisms, and the related models and experiments, from a materials science perspective. IntroductionCold spraying (CS) is a solid-state material deposition technique, where micron-sized particles of a powder bond to a substrate as a result of high-velocity impact and the associated severe plastic deformation. Acceleration of particles to high velocities is obtained via expansion of a pressurised and (ironically) 'hot' gas through a diverging-converging nozzle.Despite heating the process gas -which is to provide higher acceleration of the gas and also to facilitate particle deformation through thermal softening -the feedstock remains in the solid state throughout the entire process; hence the name 'cold' spraying. This is to underline the contrast to conventional thermal spraying where particles are completely or partially molten upon impact onto the substrate. Alternative terminology includes cold gas spray, micro cold spray, cold gas dynamic spray, kinetic spray, supersonic particle deposition and metal powder application (MPA), all of which refer to the same principle of solid-state powder deposition as described above. CS is used for coating and repair. It is also used for additive manufacturing (AM) at relatively high deposition rates as compared to the methods based on selective laser or electron beam melting. The main advantage of CS is that it alleviates the problems associated with high temperature processing of materials, such as oxidation and unfavourable structural changes. It is possibly the only continuous method to produce bulk components of metastable materials that are available only in the powder form, e.g. as obtained from mechanical attrition or gas atomisation. The aim of the present paper is to provide an overview of CS from a materials perspective, particularly for a broader audience in materials research, e.g. with interest in dynamic phenomena, plasticity and phase transformations. In terms of application and properties, CS is perhaps best to be compared to thermal spraying processes, as in [24,25]. In view of relevant physical phenomena, however, CS is mos...

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Section: Ceramics and Compositesmentioning

confidence: 99%

Cold spraying – A materials perspective

et al. 2016

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“…Calcium phosphates represent a big promise for they can be used as biomedical coatings on magnesium substrates [16]. The literature of the last couple of years enumerates several methods for hydroxyapatite deposition on magnesium/Mg alloys: sol-gel coating [17], electrodeposition [18,19], a cathodic arc PVD technique [20], chemical solution deposition [21][22][23], dipping and immersion [24,25], cold spray deposition [26], plasma electrolytic oxidation [27,28], and a transonic particle acceleration deposition process [29]. However, the available literature presenting hydroxyapatite coatings deposition with atmospheric plasma spraying on magnesium alloy substrates is incomplete.…”

Section: Introductionmentioning

confidence: 99%

“…The major drawback of this process is that when HAP is plasma sprayed, it may transform into other crystalline phases of calcium phosphate, such as α-or β-tricalcium phosphate, tetracalcium phosphate or calcium oxide; the crystallinity of HAP may also be lowered due to the rapid solidification. These alterations in chemistry and crystallinity often interfere with the novel bioactive properties of HAP, as well as with its adhesion to the implant [26]. The amorphous material and other phases are significantly more soluble than hydroxyapatite, therefore these are preferentially dissolved in vitro [32].…”

Section: Introductionmentioning

confidence: 99%

Atmospheric plasma sprayed silica–hydroxyapatite coatings on magnesium alloy substrates

Bogya

Károly

Barabáş

2015

Ceramics International

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“…Therefore, all phenomena occurring at high temperatures, such as thermal decomposition and phase transformations are avoided. Deposition of CaPO 4 particles takes place through intensive plastic deformations[580][581][582][583][584][585]. However, for successful bonding, the deposited particles have to exceed the critical velocity, which is dependent on the properties of the particular sprayed material[579].…”

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confidence: 99%