High-temperature alkali corrosion of Kyocera SN282 silicon nitride

Madeleine Kant Jordache, Henry Du

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The role of Cs in corrosion of SN282 Si3N4 with 5.35wt.% Lu2O3 was examined at 1200°C for up to 20h in oxygen with 220ppm CsNO3 to determine particulars of SN282 corrosion under Cs, and high-temperature Cs+ behavior in glass silicate hosting 137Cs. Cs accelerates SN282 oxidation. The pronounced adverse effect of Cs on Si3N4 corrosion resistance is predicted thermodynamically more strongly for SiO2 dissolution in Cs silicate than in other alkali silicates. While oxidation kinetics remained parabolic, Cs oxide layers were thick, uneven, heterogeneous and cracked.

Original languageEnglish
Pages (from-to)68-74
Number of pages7
JournalCorrosion Science
Volume91
DOIs
StatePublished - 1 Feb 2015

Keywords

  • A. Ceramic
  • A. Glass
  • A. Rare earth elements
  • C. Alkaline corrosion
  • C. High temperature corrosion
  • C. Oxidation

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