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

    Fingerprint

    Dive into the research topics of 'Corrosion Kinetics and Strength Degradation of Sintered δ‐Silicon Carbide in Potassium Sulfate Melts'. Together they form a unique fingerprint.

    Cite this