Fabrication of a hydroxyapatite-containing coating on Ti–Ta alloy by electrical discharge coating and hydrothermal treatment

Ou, Shih-Fu; Wang, Cong-Yu

doi:10.1016/j.surfcoat.2016.06.013

Cited by 48 publications

(19 citation statements)

References 30 publications

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“…It has been recently indicated that it is possible to deposit HAp powder on the surfaces of different types of Ti alloys. [16][17][18][19][20] However, machining parameters of PMEDM can influence the properties of the final product (e.g. surface roughness (SR)) and the productivity of machining process (e.g.…”

Section: Introductionmentioning

confidence: 99%

On the machinability and properties of Ti–6Al–4V biomaterial with n-HAp powder–mixed ED machining

Bains¹,

Bahraminasab

Sidhu³

et al. 2019

Proc Inst Mech Eng H

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Nano-hydroxyapatite powder was used in electric discharge machining to modify the surface of Ti–6Al–4V medical alloy. Herein, electric discharge machining was performed, with and without powder-mixed flushing for evaluation of the material erosion rate and surface roughness. In addition to dielectric type, several process parameters including current, pulse-on duration, pulse-off duration, and electrode hole diameter were considered. The experiments were planned by Taguchi design technique and conducted to analyze the material erosion rate and surface roughness. After machining, scanning electron microscope, energy-dispersive X-ray spectrometry, and X-ray diffraction techniques were used to evaluate the surfaces of the samples. Furthermore, wear and corrosion tests were also carried out on the Ti alloy with modified surfaces. The influential factors were identified based on analysis of variance results. Current and dielectric type were the significant factors, both for the material erosion rate and surface roughness. The scanning electron microscope images of Ti–6Al–4V samples highlighted that the process parameters exhibited a vital influence on the topology and microstructure of machined surface. Furthermore, energy-dispersive X-ray spectrometry and X-ray diffraction analyses confirmed the presence of hydroxyapatite on Ti alloy surface after machining. Moreover, the results of wear and corrosion tests revealed lower wear and corrosion rates of the surface-treated workpiece with nano-hydroxyapatite.

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Section: Introductionmentioning

confidence: 99%

On the machinability and properties of Ti–6Al–4V biomaterial with n-HAp powder–mixed ED machining

Bains¹,

Bahraminasab

Sidhu³

et al. 2019

Proc Inst Mech Eng H

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“…Carbon activated from fluid rapidly settled on substrate surface increases spark gap made additional carbon to deposit than normal machining. 19 The continues spark strikes reforms carbon inter-metallic together with iron transfer its phase to iron carbide, also carbon forms cementite domino effect in grain refinements and phase transferring other elements to migrated on carbon layer provides outstanding bonding of alloying elements and carbon. 20 Iron attains upper temperature crystalline structures in similar equiaxed grain boundaries on microstructure with uniform dimension promotes nucleus growth of forming metal matrix composition.…”

Section: Resultsmentioning

confidence: 99%

A comparison on microstructure and mechanical properties of electric discharge metal matrix nickel and silica composite coating on duplex stainless steel

Arun¹,

Yuvaraj²,

Madhu³

et al. 2020

Journal of Composite Materials

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Electric Discharge Alloying/Coating a thermal process of elemental deposition together with pyrolysis carbon enhance various properties. Nickel and silica both provide excellent property, but the solidification rate differs the material microstructural properties (amorphous) that improves its properties under diverse working conditions. In present study analysis of properties such as surface roughness, Microstructure, layer thickness, elemental composition, porosity, decarburizing depth is detailed through metallurgical characterizations and mechanical testing are compared to nickel and silica. Nickel holds a hardness value of 1272 HV and across 968 HV with minimal in carter, pokes, splatters having uniform boundaries that improves friction co-efficient, limiting wear resistant, phase transformation, oxidation, and graphite flakes confirm self-lubrication properties at room temperature under higher loading condition. Silica having 1284 HV on the surface and across it reaches to 980 HV due to dispersed elements and its phase transformation of silica to silica carbide directs secondary arching improves bonding by restrictive carbon deposition promotes passage to speak. This limits the porosity, coating layer thickness and increases metal matrix composition in decarburizing layer holds stability towards coating. Nickel affords surface properties limiting matrix composite, oxidation, and grain growth where else silica provides exceptional in metallurgical mixed composition improves the mechanical behaviour of coating.

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“…In these studies, the nickel ion migration was minimized; however, the formed oxide layers were excessively thin and unable to withstand sufficiently long implantation periods. In order to overcome this limitation, alternative technique such as the electrical discharge process has been investigated by several researchers on biomaterials such as NiTi, Ti-6Al-4V, Ti–35Nb–7Ta–5Zrβ, and Ti-Ta alloys [ 17 , 18 , 19 , 20 , 21 , 22 ]. Compared with the formation of the native oxide film generated by the abovementioned processes, the coating layer produced by the electrical discharge results in a high bonding strength, excellent wear and corrosion resistances, and significant biological activity [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Parametric evaluation of electrical discharge coatings on nickel-titanium shape memory alloy in deionized water

Mansor

Azmi

Zain

et al. 2020

Heliyon

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Nickel-titanium shape memory alloy (NiTi) has a unique capacity to restore its initial shape after deformation, which is highly applicable to orthopaedic implantations, especially for the minimization of invasive surgeries. The high nickel content of this alloy can lead to unfavourable effects on the human body upon dissolution; thus, a reliable barrier of coatings on the NiTi surface is required to alleviate the nickel migration and increase its biocompatibility. In this paper, analyses of a titanium oxide layer development on NiTi surface using electrical discharge coating (EDC) process is presented. The recast layer thickness, crater sizes, and surface roughness were characterized based on five parameters; polarity, discharge duration, pulse interval, peak current, and gap voltage. The results show that the discharge duration is the most significant parameter to influence all responses, followed by peak current. The surface characteristics of the EDC substrate is depending on the crater formations and is highly correlated with the discharge energy intensity. As a result, appropriate parametric conditions of the electrical discharge coating process can enhance the NiTi surface for future medical applications, without compromising the shape memory effect.

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Fabrication of a hydroxyapatite-containing coating on Ti–Ta alloy by electrical discharge coating and hydrothermal treatment

Cited by 48 publications

References 30 publications

On the machinability and properties of Ti–6Al–4V biomaterial with n-HAp powder–mixed ED machining

On the machinability and properties of Ti–6Al–4V biomaterial with n-HAp powder–mixed ED machining

A comparison on microstructure and mechanical properties of electric discharge metal matrix nickel and silica composite coating on duplex stainless steel

Parametric evaluation of electrical discharge coatings on nickel-titanium shape memory alloy in deionized water

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