Influence of sintering temperatures on hardness and Young's modulus of tricalcium phosphate bioceramic by nanoindentation technique

Wang, C.X.; Zhou, Xiaoling; Wang, M.

doi:10.1016/j.matchar.2004.06.007

Cited by 103 publications

(54 citation statements)

References 12 publications

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“…These authors wrote that to obtain higher value for the elastic modulus, the -TCP phase has been eliminated by conversion of -TCP into β-TCP by dissolution of -TCP powder in the flux and recrystallisation of β-TCP single crystals. In addition, Viswanath et al [37] added that the elastic modulus value of single crystal β-TCP is, at least, six times more that the elastic modulus of polycrystalline material reported by Wang et al [38] or Metsger et al [39]. For Viswanath et al [37], the large difference obtained between single crystal and polycrystalline material is attributed to the defect-free nature of the miniature single crystal which can also explained the result obtained in the present work.…”

Section: Instrumented Spherical Indentationsupporting

confidence: 78%

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations

Chicot¹,

Tricoteaux²,

Lesage³

et al. 2013

NJGC

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Instrumented indentation has been developed for determining the mechanical properties of materials but an accurate determination of these properties requires attention on contact stiffness analysis, indentation size effect, elastic modulus mode of calculation, role of stress distribution around the indent and its introduction in expanding cavity models for tensile mechanical properties determination. In the present work, models for hardness, elastic modulus and plastic properties determination by indentation are briefly reviewed and applied for the characterization of a porosity-free β-TCP bioceramic. As a main result the elastic modulus is found to be equal to 162 GPa resulting from the application of different approaches based on the use of various sharp and spherical indenters. Additionally, Martens and contact macrohardnesses were found to be independent on the dwell-time and equals to 4.1 and 6.3 GPa, respectively. Finally, models based on Hollomon's and Ludwik's laws as well as expanding cavity models were critically analyzed in light of their capacity to determine the yield stress and to represent the behavior law of the material. As a main result, the yield stress of the β-TCP is found to be equal to 2 GPa.

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Section: Instrumented Spherical Indentationsupporting

confidence: 78%

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations

Chicot¹,

Tricoteaux²,

Lesage³

et al. 2013

NJGC

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“…The elastic modulus of β-TCP was taken from Wang et al 56 where the elastic modulus of sintered β-TCP was evaluated at different sintering temperatures. The average modulus at the lowest sintering temperature was chosen for this study, with a value of 24.6GPa.This gives a linear elastic composite modulus E RoM = 277 x 0.75 + 24.6x10 3 x 0.25 = 6.36GPa; this was then assigned homogeneously to the strut geometries, with ν = 0.3 as before.…”

Section: Rom Modelsmentioning

confidence: 99%

Predicting the Elastic Properties of Selective Laser Sintered PCL/β-TCP Bone Scaffold Materials Using Computational Modelling

2013

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Publication InformationDoyle, H., Lohfeld, S., McHugh, P.E. (2013) 'Predicting the elastic properties of selective laser sintered PCL/b-TCP bone scaffold materials using computational modelling'. Annals Of Biomedical Engineering, 42 (3):661-677. Publisher SpringerLink to publisher's version http://link.springer.com/article/10.1007%2Fs10439-013-0913-4Item record http://hdl.handle.net/10379/5524 DOI http://dx.doi.org/10.1007/s10439-013-0913-4Accepted manuscript, published in Annals of Biomedical Engineering 09/2013; 42(3), pp 661-677. The final publication is available at Springer via http://dx.doi.org/10.1007/s10439-013-0913-4Title: Predicting the elastic properties of selective laser sintered PCL/β-TCP bone scaffold materials using computational modelling. AbstractThis study assesses the ability of finite element models to capture the mechanical behaviour of sintered orthopaedic scaffold materials. Individual scaffold struts were fabricated from a 50:50 wt% poly-ε-caprolactone (PCL) /β-tricalcium phosphate (β-TCP) blend, using selective laser sintering (SLS). The tensile elastic modulus of single struts was determined experimentally. High resolution finite element models of single struts were generated from micro-CT scans (28.8µm resolution) and an effective strut elastic modulus was calculated from tensile loading simulations. Three material assignment methods were employed: (1) homogeneous PCL elastic constants, (2) composite PCL/ β-TCP elastic constants based on rule of mixtures, and (3) heterogeneous distribution of micromechanically-determined elastic constants. In comparison with experimental results, the use of homogeneous PCL properties gave a good estimate of strut modulus; however it is not sufficiently representative of the real material as it neglects the β-TCP phase. The rule of mixtures method significantly overestimated strut modulus, while there was no significant difference between strut modulus evaluated using the micromechanically-determined elastic constants and experimentally evaluated strut modulus. These results indicate that the multi-scale approach of linking micromechancial modelling of the sintered scaffold material with macroscale modelling gives an accurate prediction of the mechanical behaviour of the sintered structure.Keywords: selective laser sintering; polycaprolactone, B-tricalcium phosphate; micromechanical modelling; bone tissue engineering; mechanical properties; finite element analysis.3 IntroductionThe purpose of bone tissue engineering scaffolds is to fill defects and support mechanical loading while providing a template on which new bone will form. The remodelling of native bone in response to mechanical loading occurs when cells convert mechanical stimuli to chemical signals to direct the formation of new tissue or resorption through mechanotransduction 30,44 . The mechanical stimuli that influence bone formation in vivo are a combination of both fluid shear over the cells 36,55 and mechanical loading of the cells 16,24,58 , therefore it is important to be able to acc...

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“…5) Thus, in the case of high capacitance MLCC with very thin BaTiO3 dielectric layer below 2 μm, these applied loads are comparatively too large to measure its mechanical property within the dielectric thin layer. Since nanoindentation technique can, unlike the Vickers method, measure mechanical properties in very small areas under very low loads, 6)-9) it is an important tool in understanding mechanical property in thin film, composite materials and layered materials.…”

Section: Introductionmentioning

confidence: 99%

Characterization of mechanical properties of BaTiO3 ceramic with different types of sintering aid by nanoindentation

Ryu

Kim

2009

J. Ceram. Soc. Japan

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The influence of glass composition on mechanical property of BaTiO3 ceramics was investigated with nanoindentation technique and also its effect on densification and dielectric property was analyzed. Two different glasses of BaO-CaO-SiO2 and BaO-ZrO2-SiO2 system were used as the sintering aid of BaTiO3 powder. It was found that the addition of BaO-ZrO2-SiO2 glass to BaTiO3 was beneficial for the densification compared to that of BaO-CaO-SiO2 glass, resulting in high dielectric constant over 2500, the hardness vale of 13.6 GPa and the elastic modulus of 167.9 GPa after sintering at 1240°C.

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Influence of sintering temperatures on hardness and Young's modulus of tricalcium phosphate bioceramic by nanoindentation technique

Cited by 103 publications

References 12 publications

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations

Predicting the Elastic Properties of Selective Laser Sintered PCL/β-TCP Bone Scaffold Materials Using Computational Modelling

Characterization of mechanical properties of BaTiO3 ceramic with different types of sintering aid by nanoindentation

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Influence of sintering temperatures on hardness and Young's modulus of tricalcium phosphate bioceramic by nanoindentation technique

Cited by 103 publications

References 12 publications

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (&lt;i&gt;β&lt;/i&gt;-TCP) Ceramic by Sharp and Spherical Indentations

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (&lt;i&gt;β&lt;/i&gt;-TCP) Ceramic by Sharp and Spherical Indentations

Predicting the Elastic Properties of Selective Laser Sintered PCL/β-TCP Bone Scaffold Materials Using Computational Modelling

Characterization of mechanical properties of BaTiO3 ceramic with different types of sintering aid by nanoindentation

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Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations

Mechanical Properties of Porosity-Free Beta Tricalcium Phosphate (<i>β</i>-TCP) Ceramic by Sharp and Spherical Indentations