Functional ceramic and nanocomposite fibers, cellular articles and microspheres via radiation curable colloidal dispersions

Hazan, Yoram de; Märkl, Veronika; Heinecke, Judit; Aneziris, Christos G.; Graule, Thomas

doi:10.1016/j.jeurceramsoc.2010.12.006

Cited by 15 publications

(18 citation statements)

References 24 publications

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“…34,35,42 Hydrophilic Silicone acrylate resin (TegoRad 2200N) was obtained from Evonic Tego, Germany. 32-35 4-HBA is water soluble and has a melting point of À112°C.…”

Section: Methodsmentioning

confidence: 99%

“…32-35 4-HBA is water soluble and has a melting point of À112°C. 35 (2) Dispersions Colloidal dispersions (10-25 wt%) in DI water were prepared by de-agglomeration of the powders on rollers (70 rpm) with 0.4 mm ZrO 2 milling balls. Two colloidal a-Al 2 O 3 powders were used: TMDAR (Taimei Chemical Co., LTD, Tokyo, Japan) with an average particle size of 150 nm and Ceralox HPA-0.5 (Condea Vista, Tuscon, AZ) with an average particle size of 400 nm.…”

Section: Methodsmentioning

confidence: 99%

“…[32][33][34][35] Such curable dispersions, which are typically solvent free are favored for layer-by-layer rapid-prototyping applications where small features with high aspect ratio are needed with high precision. [32][33][34][35] Such curable dispersions, which are typically solvent free are favored for layer-by-layer rapid-prototyping applications where small features with high aspect ratio are needed with high precision.…”

Section: Introductionmentioning

confidence: 99%

“…[32][33][34][35] Such curable dispersions, which are typically solvent free are favored for layer-by-layer rapid-prototyping applications where small features with high aspect ratio are needed with high precision. [32][33][34][35][36][37][38][39][40][41] An almost unlimited choice of radiation curable monomers, oligomers, and polymers, is available. Curing of the dispersions can be thermally initiated, 1,36,39 but photopolymerization is frequently the choice, where rapid, spatially controlled, and low temperature curing is preferred.…”

Section: Introductionmentioning

confidence: 99%

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Porous Ceramics, Ceramic/Polymer, and Metal‐Doped Ceramic/Polymer Nanocomposites via Freeze Casting of Photo‐Curable Colloidal Fluids

Hazan

2011

J. Am. Ceram. Soc.

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A novel and general process for the fabrication of porous ceramics and metal/ceramic/polymer nanocomposites by freeze‐photocuring‐casting (FPC) is presented. The homogenous fluid containing water, curable monomers, and colloidal particles is frozen, and the phase separated microstructure is fixed by photo‐initiated polymerization. At the relatively high resin/particle ratio explored here, the structure is sufficiently strong to withstand the capillary forces during ambient drying; however, it is capable of transforming to macroscopic ceramics such as Al2O3 and SiO2 by conventional debinding and sintering. The use of FPC fluids enables producing porous macroscopic shapes such as microspheres, films, and multilayer coatings having an ordered, interconnected pore network and pore sizes down to the low sub‐micrometer range. The pore structure is found to be dependent on the radius of curvature of the macroscopic structure. Ag–TiO2/polyacrylate porous nanocomposites are produced by co‐shaping of FPC containing sterically stable colloids, soluble metal salts, and monomers. Ag nanoparticles form in situ by reduction of Ag+ ions on the TiO2 surface. This triggers the photo‐polymerization of the resin without the need of a photoinitiator. It is found that if the cured layers in a multilayer stack are frozen before the newly deposited layer, the ice crystal structure formed is linked via epitaxial growth.

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“…34,35,42 Hydrophilic Silicone acrylate resin (TegoRad 2200N) was obtained from Evonic Tego, Germany. 32-35 4-HBA is water soluble and has a melting point of À112°C.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[32][33][34][35] Such curable dispersions, which are typically solvent free are favored for layer-by-layer rapid-prototyping applications where small features with high aspect ratio are needed with high precision. [32][33][34][35][36][37][38][39][40][41] An almost unlimited choice of radiation curable monomers, oligomers, and polymers, is available. Curing of the dispersions can be thermally initiated, 1,36,39 but photopolymerization is frequently the choice, where rapid, spatially controlled, and low temperature curing is preferred.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Porous Ceramics, Ceramic/Polymer, and Metal‐Doped Ceramic/Polymer Nanocomposites via Freeze Casting of Photo‐Curable Colloidal Fluids

Hazan

2011

J. Am. Ceram. Soc.

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“…[240] The potential of low viscosity photocurable dispersions with acrylate derivatives and nanometer-sized particles of alumina, titania, a-Fe 2 O 3 , as well as Fe-(C 2 O 4 ) Á H 2 O as ceramic fillers, was demonstrated by de Hazan et al, who have produced ceramic fibers of a diameter below 10 mm, as well as ceramics with a regular cell structure and a porosity of 80%. [242] The viscosity of aqueous dispersions of acrylamide derivatives and 50 vol% of silica particles, employed in CSL, have even undercut the viscosity value of 1000 mPa Á s. [246] …”

Section: Prospects and Challengesmentioning

confidence: 99%

Additive Manufacturing of Ceramic‐Based Materials

et al. 2014

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This paper offers a review of present achievements in the field of processing of ceramic-based materials with complex geometry using the main additive manufacturing (AM) technologies. In AM, the geometrical design of a desired ceramic-based component is combined with the materials design. In this way, the fabrication times and the product costs of ceramic-based parts with required properties can be substantially reduced. However, dimensional accuracy and surface finish still remain crucial features in today's AM due to the layer-by-layer formation of the parts. In spite of the fact that significant progress has been made in the development of feedstock materials, the most difficult limitations for AM technologies are the restrictions set by material selection for each AM method and aspects considering the inner architectural design of the manufactured parts. Hence, any future progress in the field of AM should be based on the improvement of the existing technologies or, alternatively, the development of new approaches with an emphasis on parts allowing the near-net formation of ceramic structures, while optimizing the design of new materials and of the part architecture.

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Effect of platinum on sintering morphology of porous YSZ ceramics

Fang

Wang

et al. 2017

Microscopy Res & Technique

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Platinum/yttria-stabilized zirconia (Pt/YSZ) porous ceramics were prepared by sintering of the Pt/PMMA/YSZ stripe-like membrane with a porogen of spherical polymethyl methacrylate (PMMA) and a precursor of platinum (Pt) of chloroplatinic acid. The microstructure of raw and processed material and Pt/ZrO calcination process at different sintering temperatures were investigated. The results showed that the spherically porous structure of Pt/YSZ was observed at a sintering temperature below 400 °C due to the thermal decomposition of PMMA. However, the pores were shrunk about 35% in diameter when YSZ compacts were sintered at the temperature of 1,450 °C. In addition, the spherical pores can be retained in the compacts when the content of Pt <5% and then gradually merged into changing when the content of Pt increased to 50%. The relative density was increased from 42% to 90% and the open porosity was decreased from 60% to 10% when Pt was added with content from 5% to 80%. The change of microstructure for Pt/YSZ is due to the migration of Pt and YSZ in the composites. The preferential migration and coalescence proceeded for Pt in Pt/YSZ is about 500 °C and YSZ clusters can keep stable until up to 900 °C. However, the growth of YSZ particle in the sintering process was hindered by the scattering of Pt phase.

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Functional ceramic and nanocomposite fibers, cellular articles and microspheres via radiation curable colloidal dispersions

Cited by 15 publications

References 24 publications

Porous Ceramics, Ceramic/Polymer, and Metal‐Doped Ceramic/Polymer Nanocomposites via Freeze Casting of Photo‐Curable Colloidal Fluids

Porous Ceramics, Ceramic/Polymer, and Metal‐Doped Ceramic/Polymer Nanocomposites via Freeze Casting of Photo‐Curable Colloidal Fluids

Additive Manufacturing of Ceramic‐Based Materials

Effect of platinum on sintering morphology of porous YSZ ceramics

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