Graphene oxide and zirconia powders were mixed using a colloidal coating route. In situ reduced graphene oxide‐toughened zirconia ceramics were prepared by spark plasma sintering. Their microstructure, mechanical properties, and toughening mechanisms were investigated. The results show that graphene oxide can be easily reduced in situ during sintering and that it disperses homogeneously within the zirconia substrate. Compared with the toughness of 3 mol.% yttria‐stabilized zirconia, the fracture toughness of in situ reduced graphene oxide‐toughened zirconia increased by up to 175% (from ~6.07 to ~10.64 MPa·m^1/2) at 0.09 wt.% graphene oxide with a small increase in hardness. The improvement is more significant than that of prereduced graphene oxide‐toughened cases, and it is associated with the formation of a C‐O‐Zr bond at the interface in addition to conventional toughening mechanisms.

中文翻译：

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原位还原氧化石墨烯增韧氧化锆复合陶瓷的制备与性能

使用胶体涂覆路线将氧化石墨烯和氧化锆粉末混合。通过火花等离子体烧结原位还原氧化石墨烯增韧的氧化锆陶瓷。研究了它们的微观结构，力学性能和增韧机理。结果表明，氧化石墨烯在烧结过程中可以很容易地原位还原，并且可以均匀地分散在氧化锆基体中。与3摩尔％的氧化钇稳定的氧化锆相比，原位还原氧化石墨烯增韧的氧化锆的断裂韧性提高了175％（从〜6.07增至〜10.64 MPa·m ^1/2含量为0.09 wt。％的氧化石墨烯，硬度略有增加。相比预还原的氧化石墨烯增韧的情况，这种改进更为显着，并且除常规增韧机理外，还与在界面处形成C-O-Zr键有关。