Corrosion of Si3N4 in Molten Alkali Sulfate and Carbonate

TSUGIO SATO, YOSHIMI KANNO, TADASHI ENDO, MASAHIKO SHIMADA

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8 Citations (Scopus)

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 languageEnglish
Pages (from-to)228-231
Number of pages4
JournalAdvanced Ceramic Materials
Volume2
Issue number3 A
DOIs
Publication statusPublished - 1987 Jul

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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