Dense-porous multilayer ceramics by green shaping and salt leaching

Seesala, Venkata Sundeep; Rajasekaran, Ragavi; Dutta, Abir; Vaidya, Pravin Vasudeo; Dhara, Santanu

doi:10.1016/j.oceram.2021.100084

Cited by 10 publications

(8 citation statements)

References 27 publications

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“…Seesala et al mentioned that delamination at the interface between the denser part and the porous part were observed after sintering due to the difference in the densification of the dense and porous parts in some cases. 27) Powder-based direct-foaming, which is a dry process rather than a wet one, is an alternative way to fabricate gradient porous ceramic via direct-foaming. As indicated by its name, the foaming reaction occurs in a powder compact composed of ceramic and binder powders including a foaming agent.…”

Section: Gradient Porous Ceramic Via Direct-foaming Processmentioning

confidence: 99%

A review on gradient macroporous ceramic via powder-based direct foaming process

Shimamura

2022

J. Ceram. Soc. Japan

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Macroporous ceramics are potentially applicable in a wide range of industrial applications. The porous structure of macroporous ceramics is designed depending on the application of macroporous ceramics. This paper reviews gradient macroporous ceramics fabricated via powder-based direct foaming to produce a relatively dense surface and a highly porous body. The fabrication process and the characterization of such ceramics are also considered. In terms of fabrication, an overview of the direct-foaming and foaming conditions to obtain a uniform porous structure is described. With regard to characterization, the unique structure of porous ceramics and effect of the denser surface on the bending strength are summarized through the results of microstructural observation and three-point bending strength measurements. The presence of the surface layer enables an improvement in the bending strength while maintaining high porosity. The fabrication processes reviewed herein are highly promising for reducing the weight of porous ceramics while enhancing their mechanical strength.

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Section: Gradient Porous Ceramic Via Direct-foaming Processmentioning

confidence: 99%

A review on gradient macroporous ceramic via powder-based direct foaming process

Shimamura

2022

J. Ceram. Soc. Japan

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“…To create microporosity, one can use a special thermal treatment scheduler to obtain undersintered ceramic material [24] or via a sol-gel synthesis-prepared powder system [25]. Another method of microporosity creation consists in using organic [26,27] or inorganic [28,29] additives in form of particles with small dimensions as sacrificed porogens. Special additives that have the ability to decompose with the release of sufficiently large volumes of gases at different stages of ceramics production can be used to generate microporosity.…”

Section: Introductionmentioning

confidence: 99%

Powder Mixture for the Production of Microporous Ceramics Based on Hydroxyapatite

et al. 2022

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Powder mixtures with a given molar ratio of Ca/P = 1.67 were prepared under mechanical activation conditions from hydroxyapatite powder Ca10(PO4)6(OH)2 and a 1M aqueous solution of oxalic acid H2C2O4 at a molar ratio of Ca10(PO4)6(OH)2/H2C2O4 = 1:4. The phase composition of obtained powder mixture included brushite (calcium hydrophosphate dihydrate) CaHPO4·2H2O, calcium oxalate monohydrate CaC2O4·H2O in form of whewellite and weddellite, and some quantity of quasi-amorphous phase. This powder mixture was used to produce microporous monophase ceramics based on hydroxyapatite Ca10(PO4)6(OH)2 with apparent density of 1.25 g/cm3 after firing at 1200 °C. Microporosity of sintered ceramics was formed due to the presence of particles with plate-like morphology, restraining shrinkage during sintering. Microporous ceramics based on hydroxyapatite Ca10(PO4)6(OH)2 with the roughness of the surface as a consequence of the created microporosity can be recommended as a biocompatible material for bone defects treatment and as a substrate for bone cell cultivation.

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“…We have previously fabricated a dense porous bilayer ceramic dental implant having 48 vol% of open porosity through green shaping of a ceramic dough and leaching of the salt porogen. Although sufficient strength and pore size were achieved, the pore window was insufficient to facilitate vasculature and tissue ingrowth 22 . Herein we report fabricating a biomimetic customized dental implant using a foam replica method for porous apical portion and a ceramic dough shaping approach for the dense portion 23,24 …”

Section: Introductionmentioning

confidence: 99%

“…Although sufficient strength and pore size were achieved, the pore window was insufficient to facilitate vasculature and tissue ingrowth. 22 Herein we report fabricating a biomimetic customized dental implant using a foam replica method for porous apical portion and a ceramic dough shaping approach for the dense portion. 23,24…”

Section: Introductionmentioning

confidence: 99%

A novel strategy for fabricating zirconia implants with a trabecular biomimetic porous surface

Seesala

Dhara

2022

J Am Ceram Soc.

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For successful osseointegration of load‐bearing implants, an improved bone–implant contact area through a trabecular porous surface resulting in minimized stress shielding effect is highly desirable. We propose a novel strategy of green net shaping a ceramic dough, combined with a reticular foam replica method and gradient coating, to fabricate biomimetic porosity in a customizable ceramic dental implant for the first time. About 85 vol% porosity and 300–600‐μm pore size were evident in microCT and electron microscopy of the sintered samples, suitable for bone ingrowth. Excellent integrity at the interface along with homogeneous distribution of secondary alumina phase in zirconia matrix was achieved, despite the difference in the green state powder loading between the dough and the slurry.

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Dense-porous multilayer ceramics by green shaping and salt leaching

Cited by 10 publications

References 27 publications

A review on gradient macroporous ceramic via powder-based direct foaming process

A review on gradient macroporous ceramic via powder-based direct foaming process

Powder Mixture for the Production of Microporous Ceramics Based on Hydroxyapatite

A novel strategy for fabricating zirconia implants with a trabecular biomimetic porous surface

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