A study of slip solids content and wall thickness on thermal shock behavior of a slip cast reaction bonded silicon nitride ladle

Somton, Kritkaew; Dateraksa, Kannigar; Laoratanakul, Pitak; Rodchom, Mana; McCuiston, Ryan C.

doi:10.1016/j.ceramint.2014.10.125

Cited by 2 publications

(3 citation statements)

References 9 publications

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“…Fine whiskers were observed in the samples produced from all three slip processing conditions, mainly located within the pores. This has been previously observed [6]. These whiskers likely resulted from a vapor phase growth mechanism, as explained in Silva et al [7].…”

Section: Resultssupporting

confidence: 74%

Slip Degassing to Improve the Properties of Slip Cast and Reaction Bonded Si3N4

Somton

Rodchom

Wonglom

et al. 2017

KEM

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The effect of slip degassing on the microstructure and mechanical properties of slip cast and reaction bonded Si3N4 was studied. The slip was prepared by aqueous ball milling of silicon (Si) powder. Hydrogen bubbles, a result of Si oxidation during milling, were degassed from the slip using a combination of vacuum and heat. The slip was then cast into a plaster mould to obtain rectangular green bodies. The Si green samples were sintered in a nitrogen atmosphere at 1500°C to convert the Si to Si3N4. After that the nitrided samples were polished to dimensions of 3 x 4 x 30 mm. The density, porosity, flexural strength, phase content and microstructure of the sintered samples were studied. The results showed that the degassing process increased the slip density. After casting and subsequent nitridation, it was found that the average apparent density of the samples increased from 2.89 to 2.95 g/cm3, the porosity decreased from 52.9 to 49.5 %, and the flexural strength increased from 8.1 to 9.3 MPa, when the degassed slip was used. A microstructural examination showed that the pores in the samples were filled with whiskers, which most likely resulted from a vapor phase growth mechanism. The samples produced from the degassed slip tended to have fewer whiskers, due to the reduced pore size and volume. A comparison of the XRD patterns showed no phase differences between the samples. The appearance of Si2N2O, and SiC likely resulted from the reactions between O2 and C impurities with Si3N4.

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Section: Resultssupporting

confidence: 74%

Slip Degassing to Improve the Properties of Slip Cast and Reaction Bonded Si3N4

Somton

Rodchom

Wonglom

et al. 2017

KEM

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“…Porous ceramics that possess both high porosity and high strength are more advantageous. In Figure 11, the bending strength versus porosity of the specimens in this work and those reported elsewhere were illustrated 5,6,9,17–38 . The referred materials are porous PLS Si 3 N 4 , porous GPS Si 3 N 4 , porous PSRB Si 3 N 4 , porous RB Si 3 N 4 , porous Al 2 O 3, and porous SiC.…”

Section: Resultsmentioning

confidence: 69%

“…In addition, it can be seen that the strength of the porous RB Si 3 N 4 fabricated in this work is significantly higher than the RB Si 3 N 4 reported in Refs. [27][28][29][30]. However, due to huge data obtained from the references, some data points in Figure 11A are overlapped then cannot be distinguished easily.…”

Section: Resultsmentioning

confidence: 99%

Mechanical property and gas filtration behavior of porous reaction bonded Si₃N₄ with monodispersed PMMA as pore former

Zhao

Cao

et al. 2022

Int J Applied Ceramic Tech

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Porous Si 3 N 4 ceramics were prepared by gel casting combined with a reaction bonding route using monodispersed PMMA as the pore former, and Isobam was used as a gel agent. With the PMMA addition varying from 0 to 20 wt.%, the bending strength was degraded from 94.0 to 39.1 MPa owing to the increased porosity and decreased bulk density. The β-Si 3 N 4 prismatic grains and round pores introduced by the monodispersed PMMA micro balls would endow the samples with high strength, and the permeability of the resulting samples was increased obviously with the increase of PMMA addition. Flue gas filtration test exhibited that the filtration efficiency of the porous ceramics filter was not degraded with introducing of the PMMA pore former, even though the permeability was increased obviously. The block type of the sample with 20-wt.% PMMA additions during filtration was cake filtration, which indicates that the sample has the characteristic of being reusable after back-blowing in flue gas filtration applications. Porous Si 3 N 4 with high strength and permeability fabricated via the reaction bonding route exhibits great potential for low-cost high-performance ceramics filters.

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A study of slip solids content and wall thickness on thermal shock behavior of a slip cast reaction bonded silicon nitride ladle

Cited by 2 publications

References 9 publications

Slip Degassing to Improve the Properties of Slip Cast and Reaction Bonded Si<sub>3</sub>N<sub>4</sub>

Slip Degassing to Improve the Properties of Slip Cast and Reaction Bonded Si<sub>3</sub>N<sub>4</sub>

Mechanical property and gas filtration behavior of porous reaction bonded Si₃N₄ with monodispersed PMMA as pore former

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A study of slip solids content and wall thickness on thermal shock behavior of a slip cast reaction bonded silicon nitride ladle

Cited by 2 publications

References 9 publications

Slip Degassing to Improve the Properties of Slip Cast and Reaction Bonded Si<sub>3</sub>N<sub>4</sub>

Slip Degassing to Improve the Properties of Slip Cast and Reaction Bonded Si<sub>3</sub>N<sub>4</sub>

Mechanical property and gas filtration behavior of porous reaction bonded Si3N4 with monodispersed PMMA as pore former

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Mechanical property and gas filtration behavior of porous reaction bonded Si₃N₄ with monodispersed PMMA as pore former