Rare earth metal ceramic and preparation method thereof

The invention discloses rare earth metal ceramic and a preparation method thereof, belongs to the field of high-toughness metal ceramic tools and molds, and relates to rare earth element strengthened and toughened Ti (C, N)-based metal ceramic and a preparation method thereof, which can be applied to cutting machining of high-end materials such as high-temperature alloys and the like. Ti (C, N) is used as a hard phase, Ni-Co is used as a binding phase, Mo2C, WC, VC, TaC and NbC are used as second-phase carbides, and a rare earth element La is added in the form of La2O3; the rare earth Ti (C, N) ceramic is prepared by adopting a powder metallurgy method of powder mixing, granulation, compression molding and sintering; la2O3 is reduced and exists in a (Ti, M) (C, N) annular phase in the form of solid solution atoms La by regulating and controlling the sintering temperature and the sintering atmosphere, so that the effect of the annular phase is further strengthened, and the performance, especially the toughness