New Challenges in the Sintering of HA/ZrO2 Composites

Vasconcelos, Cristina Nader

doi:10.5772/33017

Cited by 8 publications

(6 citation statements)

References 66 publications

(77 reference statements)

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“…25 Yttrium might not be detected in the XRD patterns after sintering as a pure element, proposing that Y 3+ (with an ionic radius of 0.09 nm) dispersed into the lattice of HA (with an ionic radius of 0.1 nm) and used the interstitial positions due to the difference in the size of their ionic radii. 26 Recognition of functional groups.-FT-IR spectrum shows several HA absorption peaks. The FT-IR spectra of pure HA and HA/Y are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Effect of Yttrium Oxide in Hydroxyapatite Biocomposite Materials: Electrical and Antimicrobial Evaluation

Turky

Hamzawy

Bassyouny

et al. 2021

ECS J. Solid State Sci. Technol.

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Synthesis and characterization of biocomposite materials of hydroxyapatite (HA) and yttrium oxide (Y2O3) were investigated. HA nanoparticles powder was obtained from mussel shells via a wet chemical precipitation routine. HA powder was doped with 1 and 2 wt% of Y2O3 . For microstructural examination, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) coupled with energy dispersive X-rays (EDX) were used. In addition, the dielectric and electrical properties and antimicrobial activities were investigated. XRD patterns reveal the crystallization of the oxyapatite. The peak intensities of pristine HA are inferior compared to the yttrium containing HA composites, thus suggesting that the addition of yttrium promotes the crystallization of HA due to the variance in their ionic radii. FT-IR shows a variation in the phosphate wavenumber, indicating the integration of yttrium into the HA matrix. SEM reveals nanorod- or worm-like crystals arose in clusters. With increasing Y2O3, from 1 to 2 wt%, the DC conductivity reduces from 16 to 9.3 nS/cm, which confirms that high amounts of Y3+ substitute Ca2+ in the HA matrix. In the high-frequency range, the AC conductivity linearly increases with increasing frequency following the universal power law. Further, antimicrobial activity results showed that the addition of yttrium in HA improves the antimicrobial effects against pathogenic bacteria and fungi. Additional research is needed to investigate the doping concentration of yttrium ions, and an anticipated property could be comprehended for several forthcoming biomedical applications

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Section: Resultsmentioning

confidence: 99%

Effect of Yttrium Oxide in Hydroxyapatite Biocomposite Materials: Electrical and Antimicrobial Evaluation

Turky

Hamzawy

Bassyouny

et al. 2021

ECS J. Solid State Sci. Technol.

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“…2a and b. CaY 2 O 3 could not be detected in the XRD patterns after sintering, as a pure substance, suggesting that Y 3+ ions are dissolved in the HA lattice and sat at interstitial positions, as expected, because of the size difference of their ionic radii [19]. …”

Section: Phase Evaluationmentioning

confidence: 98%

Effect of Yttria on the Phase Formation and Sintering of HA-Al₂O₃Biocomposites

Öksüz

Özer

2017

Acta Phys. Pol. A

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Hydroxyapatite is very-well known as the main component of hard tissues and, as such, it has attracted much attention by researchers in the recent decades. This study was aimed to present the characterization of Y2O3 doped 50 wt.% hydroxyapatite -50 wt.% Al2O3 composite materials fabricated at relatively high temperature of 1600• C. Hydroxyapatite powder was obtained from bovine bones via calcination and ball milling technique. Fine powders (≤ 1 µm) of hydroxyapatite/Al2O3 were admixed with 0.5 and 1 wt.% Y2O3 powders. Powder compacts were sintered at 1600• C for 4 h in air atmosphere. The field emission scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffraction studies following the relative density measurements were conducted. Moreover, the microhardness was studied as the mechanical property of sintered samples. The effect of increasing Y2O3 content on surface morphology, elemental distribution and phase evaluation was investigated in hydroxyapatite/Al2O3 biocomposite materials. It was found that by increasing Y2O3 content, the relative density increased up to 98.8%, while the hardness increased to 863 HV (0.2) . The main phases, which were found, are Hibonite -CaO(Al2O3)6 and beta-tricalcium phosphate -Ca3(PO4)2, according to X-ray diffraction pattern.

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“…During cooling stage, opposite transformation from the tetragonal to the monoclinic phase go on at 1052 °C and finishes at 1020 °C, it's called martensitic transformation. The volume of monoclinic unit cell is 4% more than the volume of tetragonal unit cell, this leads to the creation of ceramic flaws if no stabilizing oxides were used [2], many researches focused on using 3YSZ for prosthodontic applications (e.g., crowns, implants)and orthopedic implants, because this material exhibit the best combination of strength, toughness and hardness [3,4]. In dental tissue replacement, highstrength 3YSZ has been used for many purposes, as root canal posts, crowns for other ceramics, fixed and removable dental prostheses, implant supports, and dental fillers [5].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Zirconia- Hydroxyapatite Nanocomposites for Orthopedic and Dental Applications

Sabree¹,

Mahdi²

2018

IJET

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Zirconium oxide ceramic was proposed for different biomedical applications. It is used in orthopedic as hip and knee prostheses and in dentistry due to the good mechanical, biological high corrosion and wear resistance properties, addition to the aesthetic property owing to tooth like color. Zirconia stabilized with Y 2 O 3 has the best properties for these applications. The present work aims to study the effect of (5 and 10)Wt.% hydroxyapatite (HA) as additives to 3 mol% yttria stabilized zirconia (3YSZ) nano powder matrix. The green bod y samples were shaped by powder technology using cold pressing then sintering at (1300 and 1400)ᵒC. The 3YSZ/ HA nanocomposites samples were characterized by XRD to investigate phase stability with varying percent's of HA and different sintering temperatures, the mechanical properties (maximum bending strength and hardness) were investigated as a function of the HA content, the changes of the thermal expansion coefficient for composite samples were investigated using Dilatometer. The experimental results proved that additions of (5 and 10)Wt.% HA to 3YSZ matrix reduce both hardness and max. bending strength, while increasing sintering temperature from 1300ᵒC to 1400ᵒC leading to an increase in the hardness and bending strength for all composite samples. The results of thermal expansion test showed a reduction in the thermal expansion coefficient with presence of HA%, however the coefficient of 3YSZ/ 10%HA is closer to 3YSZ from 3YSZ/ 5%HA. EDS analysis shows improvement in the bioactivity of inert 3YSZ with HA% additions represented by increasing Ca and P ions on the composite samples after immersing in SBF for 6 days.

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New Challenges in the Sintering of HA/ZrO2 Composites

Cited by 8 publications

References 66 publications

Effect of Yttrium Oxide in Hydroxyapatite Biocomposite Materials: Electrical and Antimicrobial Evaluation

Effect of Yttrium Oxide in Hydroxyapatite Biocomposite Materials: Electrical and Antimicrobial Evaluation

Effect of Yttria on the Phase Formation and Sintering of HA-Al₂O₃Biocomposites

Characterization of Zirconia- Hydroxyapatite Nanocomposites for Orthopedic and Dental Applications

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New Challenges in the Sintering of HA/ZrO2 Composites

Cited by 8 publications

References 66 publications

Effect of Yttrium Oxide in Hydroxyapatite Biocomposite Materials: Electrical and Antimicrobial Evaluation

Effect of Yttrium Oxide in Hydroxyapatite Biocomposite Materials: Electrical and Antimicrobial Evaluation

Effect of Yttria on the Phase Formation and Sintering of HA-Al2O3Biocomposites

Characterization of Zirconia- Hydroxyapatite Nanocomposites for Orthopedic and Dental Applications

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Effect of Yttria on the Phase Formation and Sintering of HA-Al₂O₃Biocomposites