Corrosion Kinetics and Strength Degradation of Sintered δ‐Silicon Carbide in Potassium Sulfate Melts

Tsugio Sato, Kazuhide Kubota, Masahiko Shimada

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Pressureless sintered α‐SiC ceramics containing carbon and boron as sintering aids and hot‐pressed SiC containing aluminum nitride as a sintering aid were corroded in K2SO4 melts at 1080° to 1150°C. SiC ceramics were oxidized and dissolved into K2SO4 melts. Since the corrosion of SiC ceramics in K2SO4 melts proceeded autocatalytically, a reaction product such as K2S1.44 was suspected to promote the corrosion reaction. The corrosion resistance of SiC containing AlN in K2SO4 melt was superior to that of SiC containing boron and carbon. Apparent activation energies for the corrosion of SiC ceramics were 309 to 331 kJ mol‐1. The fracture strength of the specimens corroded by K2SO4 melt degraded to 40% to 70% of the original values up to a 20% weight loss and then was almost constant up to 45% weight loss.

Original languageEnglish
Pages (from-to)2152-2155
Number of pages4
JournalJournal of the American Ceramic Society
Volume74
Issue number9
DOIs
Publication statusPublished - 1991 Sep

Keywords

  • corrosion
  • potassium
  • silicon carbide
  • strength
  • sulfates

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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