Influence of microstructure and phase composition on the nanoindentation characterization of bioceramic materials based on hydroxyapatite

Tang, Chak Yin; Uskoković, Dragan; Tsui, Chi Pong; Veljović, Djordje; Petrović, Rada; Janaćković, Dj.

doi:10.1016/j.ceramint.2008.11.028

Cited by 56 publications

(37 citation statements)

References 34 publications

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“…HAP demonstrates unsatisfactory mechanical properties, principally in corrosive surroundings such as those found in the human body. Important progress has been reported into the microstructures of biocompatible ceramics, aimed at achieving implants with suitable mechanical properties used in hard tissue replacement [37]. Nowadays, studies are being focused on the modification of HAP by the addition of other phases or elements in order to obtain enhanced mechanical and corrosive properties [38].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants

et al. 2017

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Abstract:This study aims to analyze hydroxyapatite (HAP) coatings enriched with Mg and Ti prepared by a magnetron sputtering technique on Ti6Al4V substrate. For preparation of the coatings, three magnetron targets (HAP, MgO and TiO 2 ) were simultaneously co-worked. The concentration of Mg added was varied by modifying the power applied to the MgO target. In all coatings, the Ti concentration was maintained constant by keeping the same cathode power fed during the whole deposition. The influence of different Mg dopant contents on the formation of phase, microstructure and morphology of the obtained Ti-doped HAP coatings were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Moreover, the effects of Mg addition upon corrosion, mechanical and biological properties were also investigated. Mg-and Ti-doped HAP coating obtained at low radio-frequency (RF) power fed to the MgO target provided material with high corrosion resistance compared to other coatings and bare alloy. A slight decrease in hardness of the coatings was found after the Mg addition, from 8.8 to 5.7 GPa. Also, the values of elastic modulus were decreased from 87 to 53 GPa, this being an advantage for biomedical applications. The coatings with low Mg concentration proved to have good deformation to yielding and higher plastic properties. Biological test results showed that the novel surfaces exhibited excellent properties for the adhesion and growth of bone cells. Moreover, early adherent vital cell numbers were significantly higher on both coatings compared to Ti6Al4V, suggesting that Mg ions may accelerate initial osteoblast adhesion and proliferation.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants

et al. 2017

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“…The high sintering temperatures and long sintering times required for the consolidation of ceramic powders often result in extreme grain coarsening and decomposition of the ceramic, which is characteristic for conventional sintering methods and results in the deterioration of the mechanical properties of ceramics (Y.W. Gua et al, 2004& C.Y. Tang et al, 2009.…”

Section: Conventional Sintering Processmentioning

confidence: 99%

Advanced Sintering of Nano-Ceramic Materials

Khalil¹

2012

Ceramic Materials - Progress in Modern Ceramics

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“…The high sintering temperatures and long sintering times required for the consolidation of β-TCP powders often result in extreme grain coarsening and decomposition of the β-TCP, which is characteristic for conventional sintering methods and results in the deterioration of the mechanical properties of β-TCP ceramics [29,30].…”

Section: Introductionmentioning

confidence: 99%

Densification and Mechanical Behavior of β-Tricalcium Phosphate Bioceramics

Mehdikhani

Borhani

2014

ILCPA

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Nano-size β-tricalcium phosphate powders with average grain size of 80 nm were prepared by the wet chemical precipitation method with calcium nitrate and di-ammonium hydrogen phosphate as calcium and phosphorus precursors, respectively. The precipitation process employed was also found to be suitable for the production of sub-micrometre β-TCP powder in situ. The sinterability of the nano-size powders, and the microstructure, mechanical strength of the prepared β-TCP bioceramics were investigated. Bioceramic sample characterization was achieved by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FTIR), and density measurements. Powders compacted and sintered at 800, 900, 1000 and 1100 °C showed an increase in relative density from 70 % to 93 %. The results revealed that the maximum hardness of 240 H V was obtained for β-TCP sintered at 1100 °C.

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Influence of microstructure and phase composition on the nanoindentation characterization of bioceramic materials based on hydroxyapatite

Cited by 56 publications

References 34 publications

Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants

Biodegradable Ceramics Consisting of Hydroxyapatite for Orthopaedic Implants

Advanced Sintering of Nano-Ceramic Materials

Densification and Mechanical Behavior of β-Tricalcium Phosphate Bioceramics

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