Freeforming of Ceramics and Composites from Colloidal Slurries

Cesarano, Joseph; Denham, Hugh B.; Stuecker, John N.; Baer, Thomas A.; Griffith, Michelle L.

doi:10.2172/15159

Cited by 6 publications

(11 citation statements)

References 2 publications

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“…2a. The fabrication method, termed robocasting, is a freeform layered manufacturing method developed at Sandia [8] and inherently ensures that the rods meld together and form a strong bond upon sintering. The sintered lattices have controlled porosity in three dimensions, but no line-of-sight pathways.…”

Section: Technical Approachmentioning

confidence: 99%

“…Robocasting is a moldless fabrication technique developed at Sandia National Laboratories in [8][9][10] Early work demonstrated the usefulness of this process for the rapid prototyping of ceramics. Further development proved the utility of the process for metals, polymers, and composites in a variety of shapes, including self-supporting lattice structures.…”

Section: Introductionmentioning

confidence: 99%

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Revolutionary systems for catalytic combustion and diesel catalytic particulate traps.

Stuecker¹,

Witze²,

Ferrizz³

et al. 2004

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Section: Technical Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Revolutionary systems for catalytic combustion and diesel catalytic particulate traps.

Stuecker¹,

Witze²,

Ferrizz³

et al. 2004

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“…Production of CaP structures by robocasting technique was also reported in several papers. These studies range from the fabrication of simple geometries to customized complex structures designed based on the individual patient's data [35][36][37][38][39][40][41]. However, most of the studies were focused on the demonstration of the suitability of the formulated paste for the fabrication of porous structures representing different final porosities and pores sizes [35,36,38,41].…”

Section: Introductionmentioning

confidence: 99%

“…These studies range from the fabrication of simple geometries to customized complex structures designed based on the individual patient's data [35][36][37][38][39][40][41]. However, most of the studies were focused on the demonstration of the suitability of the formulated paste for the fabrication of porous structures representing different final porosities and pores sizes [35,36,38,41]. While attempts have also been conducted to increase the mechanical properties of the printed scaffolds through soaking the produced structures in the simulated body fluid (SBF) [36,42] or polymer infiltration [37,39,43], no studies have been reported on the production of dense or FGM CaP structures through this technique.…”

Section: Introductionmentioning

confidence: 99%

Robocasting of Single and Multi-Functional Calcium Phosphate Scaffolds and Its Hybridization with Conventional Techniques: Design, Fabrication and Characterization

et al. 2020

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In this work, dense, porous, and, for the first time, functionally-graded bi-layer scaffolds with a cylindrical geometry were produced from a commercially available hydroxyapatite powder using the robocasting technique. The bi-layer scaffolds were made of a dense core part attached to a surrounding porous part. Subsequently, these bi-layer robocast scaffolds were joined with an outer shell of an antibacterial porous polymer layer fabricated by solvent casting/salt leaching techniques, leading to hybrid ceramic-polymer scaffolds. The antibacterial functionality was achieved through the addition of silver ions to the polymer layer. All the robocast samples, including the bi-layer ones, were first characterized through scanning electron microscopy observations, mechanical characterization in compression and preliminary bioactivity tests. Then, the hybrid bi-layer ceramic-polymer scaffolds were characterized through antimicrobial tests. After sintering at 1300 °C for 3 h, the compressive strengths of the structures were found to be equal to 29 ± 4 MPa for dense samples and 7 ± 4 MPa for lattice structures with a porosity of 34.1%. Bioactivity tests performed at 37 °C for 4 weeks showed that the precipitated layer on the robocast samples contained octacalcium phosphate. Finally, it was evidenced that the hybrid structure was effective in releasing antibacterial Ag+ ions to the surrounding medium showing its potential efficiency in limiting Staphylococcus aureus proliferation during surgery.

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“…A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”

mentioning

confidence: 99%

Significantly decreased depolarization hydrostatic pressure of 3D‐printed PZT95/5 ceramics with periodically distributed pores

Jia

Nie

et al. 2021

J Am Ceram Soc

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Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 ferroelectric ceramics with porous structure of periodic distribution were fabricated successfully via Direct Ink Writing, a type of 3D printing technique. The effect of periodically distributed porous microstructure on the dielectric, ferroelectric, as well as hydrostatic‐pressure‐induced depolarization properties of PZT95/5 ferroelectric ceramics, was investigated. The printed porous ceramics exhibit relatively good viscoelasticity to retain the periodic structure during 3D printing and drying. In contrast with dense PZT95/5 ferroelectric ceramics prepared by conventional solid‐state sintering, low bulk density of the periodically distributed porous PZT95/5 ceramics leads to a decreased remanent polarization of 22.9 µC/cm2 under 2 kV/mm. As the hydrostatic pressure increased, the poled periodically distributed porous PZT95/5 ceramics depolarize sharply under a low and narrow hydrostatic pressure range of 113–116 MPa with a released charge density of 23.9 µC/cm2, while the poled dense PZT95/5 ceramics depolarize under a range of 250–278 MPa. Therefore, the introduction of periodically distributed micropores into PZT95/5 ceramics decreases the ferroelectric‐to‐antiferroelectric phase transition hydrostatic pressure significantly and maintained relatively excellent other properties simultaneously, such as temperature stability and low dielectric loss. The almost sharp depolarization behavior under a significantly decreased hydrostatic pressure demonstrates that periodically distributed porous PZT95/5 ferroelectric ceramics fabricated controllably by 3D printing exhibit excellent performances and prospects in mechanical–electrical energy conversion applications.

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Freeforming of Ceramics and Composites from Colloidal Slurries

Cited by 6 publications

References 2 publications

Revolutionary systems for catalytic combustion and diesel catalytic particulate traps.

Revolutionary systems for catalytic combustion and diesel catalytic particulate traps.

Robocasting of Single and Multi-Functional Calcium Phosphate Scaffolds and Its Hybridization with Conventional Techniques: Design, Fabrication and Characterization

Significantly decreased depolarization hydrostatic pressure of 3D‐printed PZT95/5 ceramics with periodically distributed pores

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