Nano-ceramic coating is a kind of ceramic coating obtained by different nano-toughening methods and preparation processes.The introduction of nano-structure can improve the brittleness of ceramic coating to a certain extent.The common toughening methods and toughening mechanism of nanostructured ceramic coatings are introduced,including whisker toughening,nanowire toughening,carbon nanotube toughening,nanoparticle toughening,nano-multilayer film toughening,nano-superlattice toughening and bionic structure toughening.The main preparation processes of nanostructured toughening ceramic coatings in recent years are briefly de-scribed.The main methods are sol-gel method,vapor deposition method,thermal spraying technology(such as plasma spraying,supersonic spraying)and magnetron sputtering.Finally,the problems and challenges in the preparation of different nano-toughened ceramic coatings are summarized,and the research direction and appli-cation prospect of nano-toughened ceramic coatings are prospected.
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