Low temperature consolidation of hydroxyapatite-reduced graphene oxide nano-structured powders

Nosrati, Hassan; Sarraf-Mamoory, Rasoul; Emameh, Reza Zolfaghari; Le, Dang Quang Svend; Pérez, María Canillas; Bünger, Cody

doi:10.1039/d0ma00212g

Cited by 9 publications

(3 citation statements)

References 71 publications

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“…Recently, large ceramic particles can be fractured and rearranged during high-pressure-assisted sintering, which provides a viable route for fabricating fully dense ceramics even using anisotropic-shaped powders [19,20]. For example, with the aid of a high pressure (5 GPa), Y 2 O 3 nanorod powder compact can achieve near full density through particle fracture, rearrangement, deformation, and interface sliding at only 500 ℃ without atomic diffusion [20].…”

Section: Introductionmentioning

confidence: 99%

An effective strategy for preparing transparent ceramics using nanorod powders based on pressure-assisted particle fracture and rearrangement

Huang

Shi²,

Zhang³

et al. 2022

J Adv Ceram

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Achieving full densification of some ceramic materials, such as Y2O3, without sintering aids by spark plasma sintering (SPS) is a great challenge when plastic deformation contributes limitedly to the densification as the yield stress of the material at an elevated temperature is higher than the applied sintering pressure. Herein, we demonstrate that particle fracture and rearrangement is an effective strategy to promote the densification during the pressure-assisted sintering process. Specifically, Y2O3 nanocrystalline powders composed of nanorod and near-spherical particles were synthesized and sintered at various temperatures by the SPS. The results show that the relative density of the ceramics prepared by the nanorod powders is higher than the density of the ceramics from the near-spherical powders after 600 °C due to the fracture and rearrangement of the nanorods at low temperatures, which leads to the decrease of particle size and the increase of density and homogeneity. Based on this novel densification mechanism, ultrafine-grained Y2O3 transparent ceramics with good optical and mechanical properties were fabricated successfully from the nanorod powders.

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Section: Introductionmentioning

confidence: 99%

An effective strategy for preparing transparent ceramics using nanorod powders based on pressure-assisted particle fracture and rearrangement

Huang

Shi²,

Zhang³

et al. 2022

J Adv Ceram

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“…Agglomeration will directly result in heterogeneity of the packed green bodies, which will cause a phenomenon referred to as differential sintering [15]. It is inspiring that anisotropic-shaped powders, rather than spherical/near-spherical powders, can improve the densi cation process and provide some new densifying routes [16,17]. For example, with the aid of high pressure (5 GPa), Y 2 O 3 nanorod powder compact can achieve near full density through particle fracture, rearrangement, deformation, and interface sliding at only 500°C without atomic diffusion [16].…”

Section: Introductionmentioning

confidence: 99%

An Improving Densification in Spark Plasma Sintering Ultrafine-grained Y2O3 Transparent Ceramic by Particle Fracture and Rearrangement

Huang¹,

Shi²,

Zhang³

et al. 2021

Preprint

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Herein, we report a new strategy on an improving densification in spark plasma sintering (SPS) ultrafine-grained Y2O3 transparent ceramic using anisotropic-shaped nanorod powders. At the low temperature stage (<600°C), fracture and rearrangement of nanorod powders will appear which can further improve the initial density of particle compact and reduce the initial particle size. When the temperature reaches beyond 600°C, the sintering efficiency of nanorod powder compact will exceed that of the green body packed by spherical powders. The ceramic sample sintered at 1300°C from nanorods is transparent with ultra-fine grain and shows good optical and mechanical properties, while the corresponding ceramic from near-spherical nanocrystalline powders is not dense enough and opaque.

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“…Among these bioceramics, HA is less soluble in the biological environment and therefore suitable for orthopedic applications as an implant [1,2]. HA is synthesized in a variety of ways, including combustion preparation, solid-state reaction, electrochemical deposition, sol-gel, hydrolysis, precipitation, sputtering, multiple emulsion, biomimetic deposition, solvothermal method, and hydrothermal process [3][4][5][6][7][8][9][10][11][12][13][14][15]. The variety of methods has made it possible to synthesize these ceramics in various forms such as rods, wires, ribbons, and tubes [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the effect of argon, hydrogen, and nitrogen gases on the reduced graphene oxide-hydroxyapatite nanocomposites characteristics

Nosrati¹,

Sarraf-Mamoory²,

Behnagh³

et al. 2020

BMC Chemistry

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In this study, the effect of the argon, nitrogen, and hydrogen gases on the final properties of the reduced graphene oxide- hydroxyapatite nanocomposites synthesized by gas injected hydrothermal method was investigated. Four samples were synthesized, which in the first sample the pressure was controlled by volume change at a constant concentration. In subsequent samples, the pressure inside the autoclave was adjusted by the injecting gases. The initial pressure of the injected gases was 10 bar and the final pressure considered was 25 bar. The synthesized powders were consolidated at 950 °C and 2 MPa by spark plasma sintering method. The final samples were subjected to Vickers indentation analysis. The findings of this study indicate that the injection of argon, hydrogen, and nitrogen gases improved the mechanical properties of the nanocomposites. Injection of gases increased the crystallinity and particle size of hydroxyapatite, and this increase was greater for nitrogen gas than for others. Injection of these gases increased the rate of graphene oxide reduction and in this case the effect of nitrogen gas was greater than the others.

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Low temperature consolidation of hydroxyapatite-reduced graphene oxide nano-structured powders

Abstract: In this study, hydroxyapatite-reduced graphene oxide (HA-rGO) powders were first synthesized in situ by a hydrothermal method. These powders were then consolidated using a cold sintering method. The solvent used...

Cited by 9 publications

References 71 publications

An effective strategy for preparing transparent ceramics using nanorod powders based on pressure-assisted particle fracture and rearrangement

An effective strategy for preparing transparent ceramics using nanorod powders based on pressure-assisted particle fracture and rearrangement

An Improving Densification in Spark Plasma Sintering Ultrafine-grained Y2O3 Transparent Ceramic by Particle Fracture and Rearrangement

Comparison of the effect of argon, hydrogen, and nitrogen gases on the reduced graphene oxide-hydroxyapatite nanocomposites characteristics

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