High-temperature phase relations of ZrN–ZrO₂–Y₂O₃ ternary system

Zirconium nitride (ZrN) ceramics were prepared via hot pressed sintering (HP) at 1750 ℃ in N₂ atmosphere with ZrO₂–Y₂O₃ as sintering additive. X-ray diffraction was applied to analyze the phase composition of the as-prepared ceramics to study the high temperature phase relation in ZrN–ZrO₂–Y₂O₃ ternary system and establish ZrN–ZrO₂–Y₂O₃ ternary phase diagrams. The results show that ZrN and tetragonal ZrO₂ (t-ZrO₂) solid solution, face-centered cubic ZrO₂ (c-ZrO₂) solid solution, body-centered cubic Y₂O₃ (c-Y₂O₃) solid solution coexist in the system of ZrN–ZrO₂–Y₂O₃.