Analysis of sintering behavior of silicon nitride based on master sintering curve theory of liquid phase sintering

Junichi Tatami, Daisuke Hiratsuka, Shigefumi Okada, Katsutoshi Komeya, Toru Wakihara

  • 1 Citations

Abstract

We propose a new master sintering curve (MSC) theory for liquid phase sintering in consideration of grain rearrangement and solution-precipitation in order to analyze the sintering behaviors of silicon nitride (Si3N4) powder compacts. We found that the MSC for liquid phase sintering is theoretically the same expression as that for solid-state sintering. Very fine high-purity powders of Si3N4 Y2O3, Al2O3, AlN, and TiO2 were used as the raw materials to make powder compacts. The degree of sintering shrinkages of the powder compacts, which contained different amounts of the sintering AIDS, were measured directly by the laser displacement measurement method using a dilatometer. Based on the displacements and the specimen dimensions, the shrinkage ratios and rates could be calculated. The sintering shrinkage behavior depended on the sintering aid used and the heating rate. The MSCs were obtained for shrinkage ratios of 0-2 and 2-15% corresponding to grain rearrangement and the solutionprecipitation process, respectively. Finally, the apparent activation energies of sintering of Si3N4 for grain rearrangement and the solution-precipitation process were found to be 251-294 and 345-430 kJ/mol, respectively, depending on the sintering aid used.

Original languageEnglish
Pages (from-to)375-380
Number of pages6
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume124
Issue number4
DOIs
StatePublished - 2016 Apr 1

Fingerprint

Sintering
Powders
Liquid phase sintering
Silicon nitride
Displacement measurement
Dilatometers
Heating rate
Raw materials
Activation energy
Lasers

Keywords

  • Grain rearrangement
  • Liquid phase sintering
  • Master sintering curve
  • Silicon nitride
  • Solution-precipitation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry
  • Chemistry(all)
  • Condensed Matter Physics

Cite this

Analysis of sintering behavior of silicon nitride based on master sintering curve theory of liquid phase sintering. / Tatami, Junichi; Hiratsuka, Daisuke; Okada, Shigefumi; Komeya, Katsutoshi; Wakihara, Toru.

In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 124, No. 4, 01.04.2016, p. 375-380.

Research output: Contribution to journalArticle

Tatami, Junichi; Hiratsuka, Daisuke; Okada, Shigefumi; Komeya, Katsutoshi; Wakihara, Toru / Analysis of sintering behavior of silicon nitride based on master sintering curve theory of liquid phase sintering.

In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 124, No. 4, 01.04.2016, p. 375-380.

Research output: Contribution to journalArticle

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keywords = "Grain rearrangement, Liquid phase sintering, Master sintering curve, Silicon nitride, Solution-precipitation",
author = "Junichi Tatami and Daisuke Hiratsuka and Shigefumi Okada and Katsutoshi Komeya and Toru Wakihara",
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AU - Tatami,Junichi

AU - Hiratsuka,Daisuke

AU - Okada,Shigefumi

AU - Komeya,Katsutoshi

AU - Wakihara,Toru

PY - 2016/4/1

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N2 - We propose a new master sintering curve (MSC) theory for liquid phase sintering in consideration of grain rearrangement and solution-precipitation in order to analyze the sintering behaviors of silicon nitride (Si3N4) powder compacts. We found that the MSC for liquid phase sintering is theoretically the same expression as that for solid-state sintering. Very fine high-purity powders of Si3N4 Y2O3, Al2O3, AlN, and TiO2 were used as the raw materials to make powder compacts. The degree of sintering shrinkages of the powder compacts, which contained different amounts of the sintering AIDS, were measured directly by the laser displacement measurement method using a dilatometer. Based on the displacements and the specimen dimensions, the shrinkage ratios and rates could be calculated. The sintering shrinkage behavior depended on the sintering aid used and the heating rate. The MSCs were obtained for shrinkage ratios of 0-2 and 2-15% corresponding to grain rearrangement and the solutionprecipitation process, respectively. Finally, the apparent activation energies of sintering of Si3N4 for grain rearrangement and the solution-precipitation process were found to be 251-294 and 345-430 kJ/mol, respectively, depending on the sintering aid used.

AB - We propose a new master sintering curve (MSC) theory for liquid phase sintering in consideration of grain rearrangement and solution-precipitation in order to analyze the sintering behaviors of silicon nitride (Si3N4) powder compacts. We found that the MSC for liquid phase sintering is theoretically the same expression as that for solid-state sintering. Very fine high-purity powders of Si3N4 Y2O3, Al2O3, AlN, and TiO2 were used as the raw materials to make powder compacts. The degree of sintering shrinkages of the powder compacts, which contained different amounts of the sintering AIDS, were measured directly by the laser displacement measurement method using a dilatometer. Based on the displacements and the specimen dimensions, the shrinkage ratios and rates could be calculated. The sintering shrinkage behavior depended on the sintering aid used and the heating rate. The MSCs were obtained for shrinkage ratios of 0-2 and 2-15% corresponding to grain rearrangement and the solutionprecipitation process, respectively. Finally, the apparent activation energies of sintering of Si3N4 for grain rearrangement and the solution-precipitation process were found to be 251-294 and 345-430 kJ/mol, respectively, depending on the sintering aid used.

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KW - Master sintering curve

KW - Silicon nitride

KW - Solution-precipitation

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