Spark plasma sintered superplastic deformed transparent ultrafine hydroxyapatite nanoceramics

Han, Young Hwan; Kim, B.-N.; Yoshida, Hidehiro; Yun, Jondo; Son, Hyung-Won; Lee, J.; Kim, S.

doi:10.1179/1743676115y.0000000059

Cited by 4 publications

(4 citation statements)

References 39 publications

(72 reference statements)

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“…On the other hand, the SPS samples had an almost uniform grain size, whereas the flash-sintered samples showed wide variations in grain size. 17 Although the hardness of the flash-sintered samples was not measured, it may be expected to be higher than the SPS and conventionally sintered samples because the hardness is inversely proportional to the grain size (H ∝ G −1/2 , where H is the hardness and G is the grain size). 18 These results showed that a proper combination of electrical power dissipation and temperature densified HA within very short sintering time.…”

Section: Resultsmentioning

confidence: 99%

Preliminary investigation of hydroxyapatite microstructures prepared by flash sintering

Bajpai

Han

Yun

et al. 2016

Advances in Applied Ceramics

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Flash sintering is a novel and emerging route for sintering ceramics within a few seconds, even under pressure-less conditions. In the current study, hydroxyapatite (HA) was fully densified by flash sintering at a furnace temperature of 1020°C. Flash sintering with constant electric fields of 750 and 1000 V cm −1 reduced the grain growth rate significantly compared to that sintered in the absence of an electric field at 1400°C. The microstructure of HA consolidated by flash sintering was compared with that of the without electric field sintered samples. The flashsintered samples showed smaller grains (160 ∼ 320 nm) than the without electric field sintered samples (∼15 µm). The samples with a higher applied electric field showed slightly better densification than those with the lower field by flash sintering. Overall, the electric flash reduces the sintering temperature effectively and decreases the holding time to densify highly insulating ceramics, such as HA.

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Section: Resultsmentioning

confidence: 99%

Preliminary investigation of hydroxyapatite microstructures prepared by flash sintering

Bajpai

Han

Yun

et al. 2016

Advances in Applied Ceramics

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“…However, in some cases, a transparency is convenient to provide some essential advantages (e.g., to enable direct viewing of living cells, their attachment, spreading, proliferation, and osteogenic differentiation cascade in a transmitted light). Thus, transparent CaPO 4 bioceramics (Figure 6) [419] have been prepared and investigated [69,87,185,187,[310][311][312][313][314][315][419][420][421][422][423][424][425][426][427]. They can exhibit an optical transmittance of ~66% at a wavelength of 645 nm [425].…”

Section: Possible Transparencymentioning

confidence: 99%

Calcium Orthophosphate (CaPO4)-Based Bioceramics: Preparation, Properties, and Applications

Dorozhkin¹

2022

Coatings

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Various types of materials have been traditionally used to restore damaged bones. In the late 1960s, a strong interest was raised in studying ceramics as potential bone grafts due to their biomechanical properties. A short time later, such synthetic biomaterials were called bioceramics. Bioceramics can be prepared from diverse inorganic substances, but this review is limited to calcium orthophosphate (CaPO4)-based formulations only, due to its chemical similarity to mammalian bones and teeth. During the past 50 years, there have been a number of important achievements in this field. Namely, after the initial development of bioceramics that was just tolerated in the physiological environment, an emphasis was shifted towards the formulations able to form direct chemical bonds with the adjacent bones. Afterwards, by the structural and compositional controls, it became possible to choose whether the CaPO4-based implants would remain biologically stable once incorporated into the skeletal structure or whether they would be resorbed over time. At the turn of the millennium, a new concept of regenerative bioceramics was developed, and such formulations became an integrated part of the tissue engineering approach. Now, CaPO4-based scaffolds are designed to induce bone formation and vascularization. These scaffolds are usually porous and harbor various biomolecules and/or cells. Therefore, current biomedical applications of CaPO4-based bioceramics include artificial bone grafts, bone augmentations, maxillofacial reconstruction, spinal fusion, and periodontal disease repairs, as well as bone fillers after tumor surgery. Prospective future applications comprise drug delivery and tissue engineering purposes because CaPO4 appear to be promising carriers of growth factors, bioactive peptides, and various types of cells.

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“…While biomedical applications do not require high temperatures, the ability to superplastically deform provides another processing route for final shaping of ceramic components. Han et al synthesised highly transparent ultrafine HA ceramics with a mean grain size of 170 nm by SPS at 900–1000°C and 80 MPa [105]. The sintered body was almost fully densified (>99%).…”

Section: Transparent Hamentioning

confidence: 99%

Spark plasma sintered bioceramics – from transparent hydroxyapatite to graphene nanocomposites: a review

Han

Gao

Bajpai

et al. 2019

Advances in Applied Ceramics

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Low toughness and wear resistance have limited application of many bioceramics in biomedical applications requiring load bearing capability. Spark plasma sintering (SPS) has widened the envelope of processing conditions available to produce bioceramics with new microstructural architectures. SPS has enabled realisation of transparent hydroxyapatite (HA) by providing the means to consolidate fully dense nanostructured HA. Recently, low-dimensional carbon nanomaterials, including carbon nanotubes (CNTs) and graphene/graphene nanoplatelets (GNP) have gained increasing attention as reinforcements due to their providing superior mechanical properties, favourable biocompatibility, and large specific surface area. Processing of these nanocomposites is done using SPS in order to consolidate the ceramics to full density in short time periods, while retaining the structure and properties of the nanomaterial reinforcements. This review focuses on recent progress on GNP/CNT reinforced HA and alumina nanocomposites, including mechanical properties, tribological behaviour, processing conditions, and mechanisms. Biocompatibility of these promising bioceramics with various cells/tissues are discussed.

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Spark plasma sintered superplastic deformed transparent ultrafine hydroxyapatite nanoceramics

Cited by 4 publications

References 39 publications

Preliminary investigation of hydroxyapatite microstructures prepared by flash sintering

Preliminary investigation of hydroxyapatite microstructures prepared by flash sintering

Calcium Orthophosphate (CaPO4)-Based Bioceramics: Preparation, Properties, and Applications

Spark plasma sintered bioceramics – from transparent hydroxyapatite to graphene nanocomposites: a review

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