The effect of direct current (DC) and alternating current (AC) on nitridation of 3 mol% Y₂O₃‐doped ZrO₂ (3YSZ) after keeping in a flash state for 1 hour was investigated. The inside of the DC‐flashed compact was confirmed to exhibit blacking. Scanning transmission electron microscopy, electron energy loss spectroscopy, and X‐ray diffraction analysis revealed that zirconium nitrides formed in the blackened area. In contrast, a uniformly densified compact without blackening was obtained by AC fields. No zirconium nitrides formed in the compacts exposed to AC fields even when the flash state was maintained for 1 hour. Therefore, AC fields are effective to suppress nitridation of 3YSZ during flash sintering.

中文翻译：

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烧结过程中抑制掺钇的氧化锆的氮化

研究了直流电（DC）和交流电（AC）在闪蒸状态下保持1小时后对3 mol％Y ₂ O ₃掺杂的ZrO ₂（3YSZ）氮化的影响。经直流闪光的粉盒内部已确认发黑。扫描透射电子显微镜，电子能量损失谱和X射线衍射分析表明，氮化锆形成在黑色区域。相反，通过AC场获得了不致发黑的均匀致密的压块。即使在保持闪蒸状态1小时的情况下，在暴露于AC场的压坯中也不会形成氮化锆。因此，交流场可有效地抑制快速烧结过程中3YSZ的氮化。