Structural Aspects of Silicon Nitride

Parr, N.L.; Sands, R. L.; Pratt, P. L.; May, Eric R.; Shakespeare, C. R.; Thompson, D. P.

doi:10.1179/pom.1961.4.8.012

Cited by 13 publications

(5 citation statements)

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“…3b and d). Compared with a report of >90%α‐Si 3 N 4 content for the RBSN of Si‐only powders, 9 the relatively low α‐Si 3 N 4 content (∼75%) obtained here is the result of the mixing of the sintering additives with Si 10 . Briefly, with these types of sintering additives, solution‐reprecipitation via the liquid phase promotes the α‐ to β‐Si 3 N 4 phase transformation.…”

Section: Resultscontrasting

confidence: 75%

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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Section: Resultscontrasting

confidence: 75%

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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“…Due to the appearance of eutectic liquid phase during the nitriding stage, relatively large amount of β-Si 3 N 4 , ranging from 40 to 50%, was formed in the RBSN specimens. It is well known that α-Si 3 N 4 phase predominantly forms by nitriding of pure Si [1]. SiAiON phase was not formed in RBSN specimens owing to low nitriding temperature [2].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Refinement of β-SiAlON by Nitriding and Post-Sintering of Si Mixture

Park

Noh

Ahn

et al. 2008

KEM

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A cost-effective route to synthesize β-SiAlONs from Si mixture by reaction bonding followed by post-sintering was investigated. Three different z values, 0.45, 0.92 and 1.87 in Si6-zAlzOzN8-z, without excess liquid phase were selected to elucidate the mechanism of both SiAlON formation and densification. For the RBSN(reaction-bonded silicon nitride) specimens, nitridation rate of more than 90% was achieved by multistep heating up to 1400oC in flowing 5%H2-95%N2 and residual Si was not detected by XRD analysis. Increase in density was observed with z values for the post-sintered specimens and this tendency was well explained by the presence of higher amount of transient liquid phase with larger z values. Measured z values of the synthesized -SiAlONs were nearly similar to calculated values using starting compositions. The slight deviation in the two z values was successfully explained by the reasonable assessment of nitriding and post-sintering process.

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“…The above achievements in porous Si 3 N 4 ceramics were based on conventional sintering. In this research, metal silicon powder, which is less expensive than Si 3 N 4 powder, was selected as a starting material and reaction-bonding [6][7][8] and post-sintering [9][10][11][12] were employed to produce porous sintered reaction-bonded silicon nitrides (SRBSNs). 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.…”

Section: Introductionmentioning

confidence: 99%

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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Structural Aspects of Silicon Nitride

Cited by 13 publications

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

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

Synthesis and Refinement of β-SiAlON by Nitriding and Post-Sintering of Si Mixture

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

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Structural Aspects of Silicon Nitride

Cited by 13 publications

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

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

Synthesis and Refinement of β-SiAlON by Nitriding and Post-Sintering of Si Mixture

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

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