Behavior of Stabilized Zirconia in Molten Sodium Sulfate.
Research and development rept.,
NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD
Pagination or Media Count:
Samples of zirconia ZrO2 stabilized with various oxides including calcia CaO, magnesia MgO, and yttria Y2O3 were exposed to molten sodium sulfate Na2SO4 at 1650F for periods up to 1000 hours to obtain an indication of the materials resistance to sulfidation. Analysis by light and scanning electron microscopy, together with elemental X-ray fluorescence spectroscopy, indicated only slight attack of the zirconia manifested by surface roughening and the formation of crystalline growths thought to have a composition similar to that of zircon ZrSiO4. Thin, glass-like layers were formed on the surfaces of the MgO- and Y2O3-stabilized specimens tested for 1000 hours. Both the glassy layers and the crystalline growths contained trace amounts of sodium Na, indicating that some reaction with the Na2SO4 had occurred.
- Ceramics, Refractories and Glass