Sintering and mechanical properties of MgO-doped nanocrystalline hydroxyapatite

Tan, C.Y.; Yaghoubi, Alireza; Ramesh, S.; Adzila, Sharifah; Purbolaksono, J.; Hassan, Mohsen A.; Kutty, Muralithran G.

doi:10.1016/j.ceramint.2013.04.098

Cited by 84 publications

(19 citation statements)

References 21 publications

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“…Smaller grain size improves energy dissipation during indentation. 29 Therefore, it appears that the bimodal structure with smaller grain size increased the grain-boundary area and mechanical properties. As can be noted from Fig.…”

Section: Microhardness and Fracture Toughnessmentioning

confidence: 98%

Microwave sintering of fine grained MgP and Mg substitutes with amorphous tricalcium phosphate: Structural, and mechanical characterization

2016

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This paper, for the first time, reports the results of microwave sintering of two emerging biomaterials, magnesium phosphate and amorphous magnesium calcium phosphate. Beneficial aspects of successful microwave sintering of calcium phosphate are well documented in the literature. The motivation for this work derives from the absence of any publication of similar nature on magnesium phosphates, which are becoming important with the rapid rise in interest in biodegradable Mg-alloys. Starting off with amorphous calcium magnesium phosphate and magnesium phosphate, the resulting microwave sintered product is a biphasic mixture of whitlockite substituted with magnesium and magnesium phosphate. The influence of the extent of Mg substitution on the mechanical properties, microstructure, and sintering behavior of tricalcium phosphate was evaluated. The results showed that the addition of Mg (up to the 50% wt/wt in relation to Ca mass) in the precursor compound of magnesium calcium phosphate improved the kinetics of the densification process and enhanced hardness values.

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Section: Microhardness and Fracture Toughnessmentioning

confidence: 98%

Microwave sintering of fine grained MgP and Mg substitutes with amorphous tricalcium phosphate: Structural, and mechanical characterization

2016

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“…Low mechanical properties of HA can be improved by precise control of the microstructure and the use of various reinforcements [46]. One of the most commonly used methods to improve the mechanical properties of HA, reinforcements of its with oxide based ceramics such as ZrO 2 [7], TiO 2 [8], Al 2 O 3 [9], MgO [10], BaTiO 3 [11] etc. In the present study, we doped a commercially synthetic hydroxyapatite powder with lanthanum oxide and the eect of lanthanum oxide on the microstructural and mechanical properties of CSHA was investigated.…”

Section: Introductionmentioning

confidence: 99%

Hydroxyapatite Lanthanum Oxide Composites

et al. 2015

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In the present study a commercially synthetic hydroxyapatite powders (CSHAp) were doped with lanthanum oxide (5 and 10 wt.% La2O3). The composite powders were well homogenized and pelleted in an uniaxial mould at 350 MPa. Pelleted green bodies were sintered at ve dierent temperatures. Finally, the eect of La2O3 amount on the microstructural and mechanical properties of CSHA was investigated. Microstructural properties were detected by X-ray diraction patterns (XRD) and scanning electron microscope (SEM). Mechanical properties of the sintered samples were determined by the density, hardness and compression strength measurements. Experimental results show that the mechanical properties of HA can be improved by the doping of La2O3

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“…Ca 9 Nd(PO 4 ) 5 (SiO 4 )F 2 has a fracture toughness of 0.75 MPa·m 1/2 , similar to hydroxyapatite. Different approaches, including doping, compositing, and microstructure control, have been utilized to improve fracture toughness of apatite. For example, MgO‐doped dense hydroxyapatite shows a greatly improved fracture toughness of 1.48 MPa·m 1/2 because of enhanced crack deflection by nanoscale grain size .…”

Section: Introductionmentioning

confidence: 99%

“…Different approaches, including doping, compositing, and microstructure control, have been utilized to improve fracture toughness of apatite. For example, MgO‐doped dense hydroxyapatite shows a greatly improved fracture toughness of 1.48 MPa·m 1/2 because of enhanced crack deflection by nanoscale grain size . Limited mechanical properties data are available for dense iodoapatite, and the only literature data for Pb 10 (VO 4 ) 6 I 2 is an elastic modulus and hardness of 26 and 4.3 GPa, respectively for sample with 82.3% TD prepared by high‐pressure sintering at 500°C for 5 h.…”

Section: Introductionmentioning

confidence: 99%

Dense Iodoapatite Ceramics Consolidated by Low‐Temperature Spark Plasma Sintering

et al. 2015

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Pb9.85(VO4)6I1.7, a potential waste form for long‐lived I‐129 immobilization, experiences phase decomposition and thus iodine loss at an elevated temperature above 400°C, presenting a significant challenge for effective management of radioactive iodine. In this work, we report low‐temperature consolidation of dense iodoapatite pellets with above 95% theoretical density by spark plasma sintering (SPS) at temperatures as low as 350°C for 20 min without iodine loss. Microstructure analysis indicates a nanocrystalline ceramic with an average grain size less than 100 nm. Grain growth dominates the sintered microstructure at higher temperatures and longer durations. The dense nanoceramics have significantly‐improved fracture toughness as compared with bulk coarsened grain structures. The effects of sintering temperatures (350°C, 400°C, 500°C, and 700°C) and durations (0–20 min) on microstructure, density, fracture morphology, and mechanical properties including Young's modulus and hardness of bulk samples were investigated. Low temperature densified iodoapatites suggest immense potential of SPS as an advanced materials fabrication technology for the development of waste forms for immobilization of volatile radionuclides including radioactive iodine.

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Sintering and mechanical properties of MgO-doped nanocrystalline hydroxyapatite

Cited by 84 publications

References 21 publications

Microwave sintering of fine grained MgP and Mg substitutes with amorphous tricalcium phosphate: Structural, and mechanical characterization

Microwave sintering of fine grained MgP and Mg substitutes with amorphous tricalcium phosphate: Structural, and mechanical characterization

Hydroxyapatite Lanthanum Oxide Composites

Dense Iodoapatite Ceramics Consolidated by Low‐Temperature Spark Plasma Sintering

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