Microstructural control of green bodies prepared from Si-based multi-component non-aqueous slurries and their effects on fabrication of Si3N4 ceramics through post-reaction sintering

Morita, Seitaro; Iijima, Motoyuki; Tatami, Junichi

doi:10.1016/j.apt.2018.08.026

Cited by 8 publications

(1 citation statement)

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“…15 found that open porosities of the RBSN specimens before post-sintering were higher than closed porosities however after post-sintering open porosities was lower than closed porosities. 17) Although they examined the porosity change of SRBSNs, the relationship between shrinkage behavior and variation of amount and morphology of pores during heating for post sintering has not yet clarified.…”

Section: Introductionmentioning

confidence: 99%

Variation of porosity and pore size during post-sintering of reaction-bonded silicon nitride doped with Y2O3 and MgO additives

Matsunaga

Zhou

Kusano

et al. 2020

J. Ceram. Soc. Japan

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Sintering of reaction-bonded silicon nitride (SRBSN) is a method of preparing Si 3 N 4 ceramics with high thermal conductivity and good mechanical properties. In the present study, by using a high purity silicon powder as the starting material and 2 mol % of Y 2 O 3 and 5 mol % of MgO as sintering additives, the phenomena including phase transformation, grain growth, densification, and pore size evolution occurred in the SRBSN process were studied. It was found that the ¡to ¢-Si 3 N 4 phase transformation could complete at 1700°C. Obvious grain growth started at around 1700°C. Substantial densification took place at temperatures between 1800 and 1900°C. When sintered at 1900°C for 30 min, not only the total number of pores drastically decreased as a result of the shrinkage of the compact, but also a fraction of open pores turned to be closed pores due to microstructural changes such as grain growth and pore coalescence.

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Section: Introductionmentioning

confidence: 99%