Polymer‐derived ceramic (PDC) route has been widely used to fabricate various ceramics or ceramic‐matrix composites in recent years. However, the synthesis of high‐entropy ceramics via PDC route has rarely been reported until now. Herein, we successfully synthesized a class of high‐entropy carbides, namely (Hf_0.25Nb_0.25Zr_0.25Ti_0.25)C (HEC‐1), via PDC route. The polymer‐derived HEC‐1 ceramics consisted of numerous superfine particles with the average particle size ~800 nm. Meanwhile, they possessed a rock‐salt structure of metal carbides and high‐compositional uniformity from nanoscale to microscale. In addition, the as‐obtained HEC‐1 ceramics had a low oxygen impurity content of 0.51% and a low free carbon impurity content of 2.56%. This work will open up a new research field on the fabrication of high‐entropy ceramics or high‐entropy ceramic‐matrix composites via PDC route.

中文翻译：

---

聚合物衍生的高熵碳化陶瓷粉的制备与表征

近年来，聚合物衍生的陶瓷（PDC）路线已被广泛用于制造各种陶瓷或陶瓷基复合材料。但是，到目前为止，很少有人报道通过PDC途径合成高熵陶瓷。在这里，我们成功地合成了一类高熵碳化物，即（Hf _0.25 Nb _0.25 Zr _0.25 Ti _0.25C（HEC-1），通过PDC路由。聚合物衍生的HEC-1陶瓷由许多超细颗粒组成，平均粒径约为800 nm。同时，它们具有金属碳化物的岩盐结构和从纳米级到微米级的高组成均匀性。另外，所获得的HEC-1陶瓷的氧杂质含量低至0.51％，游离碳杂质含量低至2.56％。这项工作将为通过PDC途径制造高熵陶瓷或高熵陶瓷基复合材料开辟一个新的研究领域。