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Sea‐Salt Corrosion and Strength of a Sintered α‐Silicon Carbide
Author(s) -
Fox Dennis S.,
Cuy Michael D.,
Nguyen QuynhGiao N.
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02517.x
Subject(s) - corrosion , salt (chemistry) , silicon carbide , sodium sulfate , materials science , metallurgy , silicon , deposition (geology) , sulfate , sodium silicate , magnesium , sodium , chemistry , paleontology , sediment , biology
A commercially available, sintered silicon carbide was exposed to a temperature of 982°C for up to 50 h in a burner rig pressurized to 500 kPa. Synthetic sea salt added to the flame (5 ppm) resulted in the deposition of sodium sulfate and formation of a sodium magnesium silicate corrosion product. A 16% reduction in room‐temperature strength occurred after 5 h of exposure; this reduction was due to the formation of surface pits. Exposure for longer times resulted in continued strength reduction, up to 56% at 25 h. Samples exposed for 50 h were so degraded that mechanical tests could not be conducted. The strength after 25 h of exposure to a salt concentration of 2 ppm was similar to the as‐received strength, whereas exposures to 10 ppm of salt resulted in strengths similar to that observed with 5 ppm of salt.