Ceramic Processing

Rahaman, Mohamed N.

doi:10.1002/0471238961.0305180105231921.a01.pub2

Cited by 6 publications

(9 citation statements)

References 210 publications

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“…On the other hand, on the porous sections, entire filaments were covered by a newly formed thick layer (image B and C), suggesting higher bioactivity of the porous section compared to the dense one. The morphology of the deposited crystals was observed as rod-shaped or needle-like, in agreement with previous literature [60,61], and was distributed evenly on the surfaces (image D).…”

Section: In Vitro Bioactivity Testsupporting

confidence: 90%

“…P1 was the first formulation that led to the successful printing of the lattice parts, at 49.2 vol% solid along with 6.5 and 16% of methocel and PEI, respectively. However, the high organic matter content in this formulation could lead to residual pores during sintering, and thus to incomplete consolidation [60]. Therefore, in order to reduce the organic matter, P2 was prepared at the same solid loading as P1 but at reduced methocel and PEI amounts (they were decreased from 6.5 to 3.5 and 16 to 8%, respectively).…”

Section: Paste Formulationsmentioning

confidence: 99%

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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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Section: In Vitro Bioactivity Testsupporting

confidence: 90%

Section: Paste Formulationsmentioning

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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“…This suggests that the variation in green compaction pressures and processing conditions had a significant influence on the microstructural integrity and resulting mechanical properties. Typically, with lower green density, the sintering can cause particle coalescence only to an extent such that internal porosity still remains widely distributed [31,32]. In this case, it is more apparent from Figure 13 that larger size and regular grain shaped pores had formed, which suggests that ZnO grains were pulled out of the matrix instead of only the smaller secondary phases in Figure 12 within a denser matrix.…”

Section: Resultsmentioning

confidence: 98%

Comparative Characterization of Different Cutting Strategies for the Sintered ZnO Electroceramics

2021

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Sintered zinc oxide (ZnO) ceramic is a fragile and difficult-to-cut material, so finishing operations demand handling cautious and accurate surface tolerances by polishing, grinding, or machining. The conventional machining methods based on grinding and lapping offer limited productivity and high scalability; therefore, their incapacity to prepare tight tolerances usually end up with uncontrolled edge chipping and rough surfaces in the final products. This study investigates microstructural features with surface roughness in a comparative mode for conventional milling and abrasive waterjet cutting (AWJ). Edge topography and roughness maps are presented in this study to weigh the benefits of AWJ cutting over the conventional material removal methods by altering the feed rates. The porosity analysis implies that the differences during the multi-channel processing of varistors, which tend to alter the microstructure, should in turn exhibit a different response during cutting. The surface roughness, edge contours, and porosity generation due to shear forces are interpreted with the help of 3D optical and electron microscopy. The results demonstrate that the surface microstructure can have a noteworthy impact on the machining/cutting characteristics and functionality, and in addition, mechanical properties of ZnO varistors can fluctuate with non-uniform microstructures.

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“…This effect has been discussed in more detail in the ceramic processing literature. In the case of fibers the length of diffusion paths is considerably shorter in comparison with bulk ceramics, what is resulting in significantly more effective matter transport [18]. Consequent 100°C decrease in sintering temperature is sufficient from point of view of fibers microscopic quality.…”

Section: Microstructure Of Plzt 7/65/35 Ceramics In Fiber Formmentioning

confidence: 99%

PLZT Microfibers Technology Optimization

Kozielski¹,

Adamczyk²,

Feliksik³

et al. 2016

Archives of Metallurgy and Materials

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Electrocaloric (EC) structures for a new generation of cooling or heating elements utilize the temperature dependence of spontaneous polarization in some ferroelectric materials to convert waste heat into electricity and vice versa. A (Pb0.93La0.07) (Zr0.65Ti0.35)O3 material, have the largest recorded pyroelectric coefficient. An effective predicted form for such applications is fiber, due to small heat capacitance and quick response time, even for nano second laser excitation. Consequently, the presented work provides a description of the optimization of structural, ferroelectric and piezoelectric properties of obtained fibers, finally concluding on necessity of sintering temperature reduction in 100°C in contrast to bulk form to effectively prevent its destruction.

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Ceramic Processing

Cited by 6 publications

References 210 publications

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

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

Comparative Characterization of Different Cutting Strategies for the Sintered ZnO Electroceramics

PLZT Microfibers Technology Optimization

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