Thermal barrier coating and preparation method thereof

The invention relates to the technical field of turbine blade high-temperature anti-oxidation coatings, in particular to a thermal barrier coating and a preparation method thereof.The thermal barrier coating comprises a first metal layer, a second metal layer, a first ceramic layer and a second ceramic layer which are sequentially arranged on the surface of high-temperature alloy. The first metal layer comprises the following components in percentage by mass: 20%-25% of Co, 22%-24% of Cr, 13%-15% of Al, 1.2%-1.4% of Y, 0.3%-0.5% of Hf, 0.3%-0.5% of Si and the balance of Ni; the second metal layer comprises 12%-15% of Si, 6%-8% of Y and the balance Al; the first ceramic layer is a YSZ ceramic layer, the second ceramic layer is a La2Ce2O7 and modified material ceramic layer and double-metal-layer structure, the rule that the Al content is in concentration gradient reduction change from the outer surface to the interior is achieved, the mutual diffusion phenomenon between the Al element and a matrix can be effec