Chromium nitride powders oxidized to Cr 2 O 3 noticeably above 400 o C. Bulk chromium nitrides that were manufactured by sintering were oxidized between 900 and 1100 o C in atmospheric air. The Cr 2 O 3 layer that formed on bulk chromium nitrides having pores was relatively dense, and grew primarily via the inward transport of oxygen. The Cr 2 O 3 layer to some degree deterred the nitrogen evolution from bulk chromium nitrides.
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