X-RAY INVESTIGATION OF <font>Ti</font>-DOPED HYDROXYAPATITE COATING BY MECHANICAL ALLOYING

Hannora, Ahmed E.; Mamaeva, A.; Mansurov, Z. A.

doi:10.1142/s0218625x09013256

Cited by 9 publications

(5 citation statements)

References 15 publications

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“…It was shown that significant decrease of the HA particle and crystalline size as a result of HEBM, leads to the formation of the nano-scale structure. The comparison of surface topography for composite substrates shows that one hour of HEBM with optimum ball to powder ratio equals to 40:1 leads to the reduction of surface particle size from 1.0 Pm to 80 nm [7,8]. Let us discuss these results in more details.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of Nanocrystalline Hydroxyapatite Coating

2010

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A novel approach for depositing of hydroxyapatite (HA) films on titanium substrates by using high energy ball milling (HEBM) has been developed. It was demonstrated that a heat treatment of the mechanically coated HA at 800 °C for one hour leads to partial transformation of HA phase to -TCP. It appears that the grain boundary and interface defects formed during MCS reduce this characteristic transformation temperature. Also, it was shown that Ti incorporation into the HA structure causes the lattice shrinkage and reduction of its grain size as compared to pure HA, but also promote the phase transformation of HA to TCP at high temperature. It is important that doping HA by silicon, while also significantly decrease crystallinity of deposited HA layer, results in hindering of the phase transformation process. The Si-doped HA does not show phase transition or decomposition after heat treatment even at<br />900 °C. The samples were investigated by X-ray diffraction, scanning electron microscope, Energy dispersive spectroscopy, Atomic force microscopy, Transmission electron microscopy, inductively coupled plasma (ICP) optical emission spectrometer, Vickers microhardness, Electron paramagnetic resonance.

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Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of Nanocrystalline Hydroxyapatite Coating

2010

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“…Coated SiHA on Ti substrate demonstrates the foundation of HA, as well as Si peaks. Comparison of these patterns with those obtained in [ 7 , 8 ] shows the influence of high-energy ball milling process on the structure stability of the formed phases.…”

Section: Resultsmentioning

confidence: 59%

“…Since kinetic solubility is dependent on particle size, there has been great interest in nanosized HA-based cement as bone substitute materials [ 5 , 6 ]. Our group also has recently described the effect of high energy ball milling treatment on HA and Ti substrate [ 7 , 8 ]. It was shown that, during this type of mechanical treatment, a significant decrease of the HAs' particle and crystalline size takes place which leads to formation of nanoscaled coating on the Ti substrate.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline Hydroxyapatite/Si Coating by Mechanical Alloying Technique

Hannora

Mukasyan

Mansurov

2012

Bioinorganic Chemistry and Applications

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A novel approach for depositing hydroxyapatite (HA) films on titanium substrates by using mechanical alloying (MA) technique has been developed. However, it was shown that one-hour heat treatment at 800°C of such mechanically coated HA layer leads to partial transformation of desired HA phase to beta-tri-calcium phosphate (β-TCP) phase. It appears that the grain boundary and interface defects formed during MA promote this transformation. It was discovered that doping HA by silicon results in hindering this phase transformation process. The Si-doped HA does not show phase transition to β-TCP or decomposition after heat treatment even at 900°C.

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“…These include Ti/HA systems [11], HA/β-TCP [12], and HA/TiO 2 [13]. It is important to emphasise that in the widely used plasma spraying method for the application of coatings a continuous flame or plasma sputtering is used [14,15]. This can lead to undesirable overheating or melting of the particles and a significant substrate temperature increase, which is a major limitation of this method.…”

Section: Introductionmentioning

confidence: 99%

Obtaining functional-gradient Ti-HA coatings by detonation spraying

Sagdoldina¹,

Baizhan²,

Kambarov³

et al. 2022

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Functional-gradient titanium/hydroxyapatite (TiHA) coatings were obtained using detonation spraying technology to improve the structure and mechanical properties. To obtain functional-gradient coatings, pulsed energy sources are best suited, namely, detonation spraying, in which the energy of the explosion of gas mixtures is used as a source of pulsed action. By controlling the modes of detonation spraying, it is possible to vary the temperature and rate of coating deposition; accordingly, it is possible to obtain a certain structuralphase structure of the coatings. The structural-phase state and tribological properties of TiHA detonation coatings were investigated by modern materials science methods: X-ray phase analysis (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX-mapping), profilometry and ball-disk wear-resistance test. The results showed that the coatings had a continuously gradient elemental composition across the cross-section of the coatings with no boundary between the elemental layers of the coatings. The amount of Ti gradually decreased and the amount of hydroxyapatite gradually increased in the direction from the substrate to the surface of the coatings, which allows to expand the possibilities of using TiHA-coatings for bone implants. Since the surface layer is composed of HA, the resulting functional-gradient coating demonstrates excellent biocompatibility and the ability to create new bone tissue. The excellent mechanical strength of the functionally graded coatings is ensured by the Ti phase.

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X-RAY INVESTIGATION OF Ti-DOPED HYDROXYAPATITE COATING BY MECHANICAL ALLOYING

Cited by 9 publications

References 15 publications

Mechanochemical Synthesis of Nanocrystalline Hydroxyapatite Coating

Mechanochemical Synthesis of Nanocrystalline Hydroxyapatite Coating

Nanocrystalline Hydroxyapatite/Si Coating by Mechanical Alloying Technique

Obtaining functional-gradient Ti-HA coatings by detonation spraying

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