Corrosion of Si3N4 in Molten Alkali Sulfate and Carbonate

TSUGIO SATO; YOSHIMI KANNO; TADASHI ENDO; MASAHIKO SHIMADA

doi:10.1111/j.1551-2916.1987.tb00086.x

Corrosion of Si₃N₄ in Molten Alkali Sulfate and Carbonate

TSUGIO SATO, YOSHIMI KANNO, TADASHI ENDO, MASAHIKO SHIMADA

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Abstract

Corrosion behavior of Si₃N₄ ceramics in various molten alkali sulfates and carbonates exposed to air and nitrogen gas were investigated at 900° to 1200°C and 700° to 1013 °C, respectively. The minimum reactant molar ratios of K₂SO₄/Si₃N₄ and K₂CO₃/Si₃N₄ necessary for complete reactions in a nitrogen gas were 1.6 and 3.5, respectively. The surface chemical reaction control shrinking core model adequately described the relation between reaction time and fractional extraction of Si₃N₄ in alkali sulfate and alkali carbonate exposed to nitrogen gas atmosphere. The apparent activation energies for the reactions of Si₃N₄ in alkali sulfate and alkali carbonate melts exposed to nitrogen gas were 430 kJ/mol and 106 kJ/mol, respectively, and were independent of the alkali cation species in the melt. 1987 The American Ceramic Society

Original language	English
Pages (from-to)	228-231
Number of pages	4
Journal	Advanced Ceramic Materials
Volume	2
Issue number	3 A
DOIs	https://doi.org/10.1111/j.1551-2916.1987.tb00086.x
Publication status	Published - 1987 Jul

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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10.1111/j.1551-2916.1987.tb00086.x

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title = "Corrosion of Si3N4 in Molten Alkali Sulfate and Carbonate",

abstract = "Corrosion behavior of Si3N4 ceramics in various molten alkali sulfates and carbonates exposed to air and nitrogen gas were investigated at 900° to 1200°C and 700° to 1013 °C, respectively. The minimum reactant molar ratios of K2SO4/Si3N4 and K2CO3/Si3N4 necessary for complete reactions in a nitrogen gas were 1.6 and 3.5, respectively. The surface chemical reaction control shrinking core model adequately described the relation between reaction time and fractional extraction of Si3N4 in alkali sulfate and alkali carbonate exposed to nitrogen gas atmosphere. The apparent activation energies for the reactions of Si3N4 in alkali sulfate and alkali carbonate melts exposed to nitrogen gas were 430 kJ/mol and 106 kJ/mol, respectively, and were independent of the alkali cation species in the melt. 1987 The American Ceramic Society",

author = "TSUGIO SATO and YOSHIMI KANNO and TADASHI ENDO and MASAHIKO SHIMADA",

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T1 - Corrosion of Si3N4 in Molten Alkali Sulfate and Carbonate

AU - SATO, TSUGIO

AU - KANNO, YOSHIMI

AU - ENDO, TADASHI

AU - SHIMADA, MASAHIKO

PY - 1987/7

Y1 - 1987/7

N2 - Corrosion behavior of Si3N4 ceramics in various molten alkali sulfates and carbonates exposed to air and nitrogen gas were investigated at 900° to 1200°C and 700° to 1013 °C, respectively. The minimum reactant molar ratios of K2SO4/Si3N4 and K2CO3/Si3N4 necessary for complete reactions in a nitrogen gas were 1.6 and 3.5, respectively. The surface chemical reaction control shrinking core model adequately described the relation between reaction time and fractional extraction of Si3N4 in alkali sulfate and alkali carbonate exposed to nitrogen gas atmosphere. The apparent activation energies for the reactions of Si3N4 in alkali sulfate and alkali carbonate melts exposed to nitrogen gas were 430 kJ/mol and 106 kJ/mol, respectively, and were independent of the alkali cation species in the melt. 1987 The American Ceramic Society

AB - Corrosion behavior of Si3N4 ceramics in various molten alkali sulfates and carbonates exposed to air and nitrogen gas were investigated at 900° to 1200°C and 700° to 1013 °C, respectively. The minimum reactant molar ratios of K2SO4/Si3N4 and K2CO3/Si3N4 necessary for complete reactions in a nitrogen gas were 1.6 and 3.5, respectively. The surface chemical reaction control shrinking core model adequately described the relation between reaction time and fractional extraction of Si3N4 in alkali sulfate and alkali carbonate exposed to nitrogen gas atmosphere. The apparent activation energies for the reactions of Si3N4 in alkali sulfate and alkali carbonate melts exposed to nitrogen gas were 430 kJ/mol and 106 kJ/mol, respectively, and were independent of the alkali cation species in the melt. 1987 The American Ceramic Society

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Corrosion of Si₃N₄ in Molten Alkali Sulfate and Carbonate

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