The invention relates to a
ceramic thermal barrier coating layer and a method for quickly preparing the
coating layer through in-situ reaction, and belongs to the field of preparation and applicationof inorganic
nonmetal materials. The component of the
coating layer is La2(Ce1-xMx)2O7+
delta, and M is one or a combination of two of Ti, Zr, Hf, Ta, Nb, Mo and W, wherein x is more than or equal to 0.10 and less than or equal to 0.30, and
delta is more than or equal to 0 and less than or equal to 0.6. The
coating layer is prepared by uniformly mixing soluble
lanthanum salt, soluble
cerium salt and soluble M salt through a
plasma spraying method. The preparation method has the characteristics of simplicity, efficiency, low cost, flexible adjustment and control of the component of the coating layer, and is suitable for industrial production. The coating layer prepared through solution
plasma spraying is excellent in heat isolation performance and
thermal shock resistance; and the coating layer is stable in structure and long in service life and can be applied to high-temperature protection of a high-temperature
alloy such as a
marine engine, an aero-engine, a ground gas
turbine and a
rocket engine or a hot-end component of a
refractory alloy.