TY - JOUR
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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U2 - 10.1111/j.1551-2916.1987.tb00086.x
DO - 10.1111/j.1551-2916.1987.tb00086.x
M3 - Article
AN - SCOPUS:84987316909
VL - 2
SP - 228
EP - 231
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
IS - 3 A
ER -