Design of Porosity Level for Porous Si&lt;sub&gt;3&lt;/sub&gt;N&lt;sub&gt;4&lt;/sub&gt; Ceramics Manufactured by Nitriding and Post-Sintering of Si Powder Compact

Park, Young Jo; Choi, Eunjong; Lim, Hyung Woo; Kim, Hai Doo

doi:10.4028/0-87849-419-7.1017

Cited by 2 publications

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“…On the other hand, PMMA sites collapsed and were not detected in the zero Si 3 N 4 specimens (0SN20P). A mechanism of PMMA site collapse in Si 3 N 4 -free systems has been proposed 14) . Briefly, the collapse of the PMMA site is dependent on the size ratio of PMMA to silicon being larger than a critical value.…”

Section: Resultsmentioning

confidence: 99%

“…Two stages, nitriding and post-sintering, in this process are sources of compositional and processing variables, such as species and content of sintering additive, diluents, multistep nitriding temperatures, atmosphere, and flow rate of nitriding gas. The effects of various components on nitriding behavior of powder mixtures, 13) a mechanism of pore structure evolution depending on the size ratio of pore former to Si particle 14) and the relationship between permeability and pore structure 15) were previously reported. The control of porosity and pore shape has also been studied using various pore former contents and sintering conditions.…”

Section: Introductionmentioning

confidence: 96%

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The Effect of Si₃N₄Addition on Nitriding and Post-Sintering Behavior of Silicon Powder Mixtures

Park¹,

Ko²,

Lee³

et al. 2012

Journal of the Korean Ceramic Society

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Nitriding and post-sintering behavior of powder mixture compacts were investigated. As mixture compacts are different from simple Si compacts, the fabrication of a sintered body with a mixture composition has engineering implications. In this research, in specimens without a pore former, the extent of nitridation increased with Si 3 N 4 content, while the highest extent of nitridation was measured in Si 3 N 4-free composition when a pore former was added. Large pores made from the thermal decomposition of the pore former collapsed, and they were filled with a reaction product, reaction-bonded silicon nitride (RBSN) in the Si 3 N 4-free specimen. On the other hand, pores from the decomposed pore former were retained in the Si 3 N 4-added specimen. Introduction of small Si 3 N 4 particles (d 50 = 0.3 µm) into a powder compact consisting of large silicon particles (d 50 = 7 µm) promoted close packing in the green body compact, and resulted in a stable strut structure after decomposition of the pore former. The local packing density of the strut structure depends on silicon to Si 3 N 4 size ratio and affected both nitriding reaction kinetics and microstructure in the post-sintered body.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

The Effect of Si₃N₄Addition on Nitriding and Post-Sintering Behavior of Silicon Powder Mixtures

Park¹,

Ko²,

Lee³

et al. 2012

Journal of the Korean Ceramic Society

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“…With preferred material properties such as complex pore channel paths and large specific surface area aided by their rod‐like grain morphology, silicon nitride (Si 3 N 4 ) ceramics make excellent candidates for filtering media 1–3 . However, the diameter (ϕ) of the pore channels in porous sintered reaction‐bonded silicon nitride ceramics (SRBSNs) is usually restricted to ∼1 μm for the following reasons: (1) the nitriding mechanism involves both gas and solid phases, and (2) grain growth is limited to 1–2 μm in the porous body by the liquid phase sintering vehicle 3–5 . As narrow pore channels produce a large pressure drop across current SRBSN filters, the widening of their pore channels to the size of those in commercial filters (ϕ≥10 μm) is strongly desired.…”

Section: Introductionmentioning

confidence: 99%

The Characterization of Porous Sintered Reaction-Bonded Silicon Nitride Ceramics Fabricated by Si-Additive Mixture Granules

Park

Lee

et al. 2011

International Journal of Applied Ceramic Technology

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Porous sintered reaction-bonded silicon nitride ceramics with dual-sized pore channels were fabricated using granules consisting of a Si-additive. A pressureless tapping method was used to maintain the spherical morphology of the weak spraydried granules. Emphasis was placed on the formation of wide pore channels (f ! 10 mm). In addition to the successful formation of wide pore channels between the granules, narrow channels formed inside the granules. The size of the wide channels (f 5 5-20 mm) depended on the granule. On the other hand, the narrow channel size (fo1 mm) remained the same regardless of the granule size.

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Design of Porosity Level for Porous Si<sub>3</sub>N<sub>4</sub> Ceramics Manufactured by Nitriding and Post-Sintering of Si Powder Compact

Cited by 2 publications

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The Effect of Si₃N₄Addition on Nitriding and Post-Sintering Behavior of Silicon Powder Mixtures

The Effect of Si₃N₄Addition on Nitriding and Post-Sintering Behavior of Silicon Powder Mixtures

The Characterization of Porous Sintered Reaction-Bonded Silicon Nitride Ceramics Fabricated by Si-Additive Mixture Granules

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Design of Porosity Level for Porous Si<sub>3</sub>N<sub>4</sub> Ceramics Manufactured by Nitriding and Post-Sintering of Si Powder Compact

Cited by 2 publications

References 0 publications

The Effect of Si3N4Addition on Nitriding and Post-Sintering Behavior of Silicon Powder Mixtures

The Effect of Si3N4Addition on Nitriding and Post-Sintering Behavior of Silicon Powder Mixtures

The Characterization of Porous Sintered Reaction-Bonded Silicon Nitride Ceramics Fabricated by Si-Additive Mixture Granules

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The Effect of Si₃N₄Addition on Nitriding and Post-Sintering Behavior of Silicon Powder Mixtures

The Effect of Si₃N₄Addition on Nitriding and Post-Sintering Behavior of Silicon Powder Mixtures