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Dissolution Rate of Silicon Nitride Ceramics into Molten CaO–Al 2 O 3 –SiO 2 Slags
Author(s) -
Taira Shoichirou,
Yamasaki Yasuyuki,
Nakashima Kunihiko,
Mori Katsumi
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02923.x
Subject(s) - dissolution , crucible (geodemography) , slag (welding) , materials science , ceramic , silicon nitride , metallurgy , silicon , nitrogen , nitride , mineralogy , diffusion , ion , inorganic chemistry , chemistry , layer (electronics) , composite material , computational chemistry , physics , organic chemistry , thermodynamics
The dissolution rates of silicon nitride (Si 3 N 4 ) ceramics into CaOAl 2 O 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 3 N 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, Ficks law of diffusion was used to analyze the dissolution rates. The dissolution mechanism of the Si 3 N 4 ceramics into CaO–Al 2 O 3 SiO 2 slags has been discussed in this paper.