Dissolution rate of silicon nitride ceramics into molten CaO-Al 2O 3-SiO 2 slags

Shoichirou Taira, Yasuyuki Yamasaki, Kunihiko Nakashima, Katsumi Mori

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The dissolution rates of silicon nitride (Si 3N 4) ceramics into CaO-Al 2O 3-SiO 2 slags were investigated by using a rotating specimen method in the temperature range of 1773-1873 K. Dissolution rates in the present study increased as the revolution speed and temperature increased and decreased as the SiO 2 content of the slags increased. The nitrogen content of the slags increased after the Si 3N 4 ceramics had been immersed into them. The slags contained two types of nitrogen ions - N 3- and CN - - because a graphite crucible was used for the experiment. N 3- ions were confirmed in all the slags that were used in the present work; the CN - content was much lower than that of the N 3- ions, except in the slag without SiO 2. Based on those results, Fick's law of diffusion was used to analyze the dissolution rates. The dissolution mechanism of the Si 3N 4 ceramics into CaO-Al 2O 3-SiO 2 slags has been discussed in this paper.

Original languageEnglish
Pages (from-to)925-932
Number of pages8
JournalJournal of the American Ceramic Society
Volume80
Issue number4
Publication statusPublished - Apr 1 1997

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slag
Silicon nitride
ceramics
Slags
silicon
Molten materials
Dissolution
dissolution
Ions
ion
Nitrogen
Fick's laws
Graphite
nitrogen
Crucibles
rate
silicon nitride
graphite
temperature
Temperature

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Dissolution rate of silicon nitride ceramics into molten CaO-Al 2O 3-SiO 2 slags. / Taira, Shoichirou; Yamasaki, Yasuyuki; Nakashima, Kunihiko; Mori, Katsumi.

In: Journal of the American Ceramic Society, Vol. 80, No. 4, 01.04.1997, p. 925-932.

Research output: Contribution to journalArticle

Taira, Shoichirou ; Yamasaki, Yasuyuki ; Nakashima, Kunihiko ; Mori, Katsumi. / Dissolution rate of silicon nitride ceramics into molten CaO-Al 2O 3-SiO 2 slags. In: Journal of the American Ceramic Society. 1997 ; Vol. 80, No. 4. pp. 925-932.
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