Sintering-resistant long-service-life thermal barrier coating of double-layer structure and preparation method of thermal barrier coating

Abstract

The invention discloses an sintering-resistant long-service-life thermal barrier coating of a double-layer structure and a preparation process of the thermal barrier coating. The thermal barrier coating comprises a toughening layer located inside and a heat insulating layer located outside. The heat insulating layer is formed by composite stacking of dense sheet layer units and loose nano-particlepiles, the thickness of the toughening layer accounts for 10%-50% of the total thickness of the thermal barrier coating of the double-layer structure, and the fracture toughness of a first thermal barrier coating material is larger than or equal to 2.5 MPa.m1 / 2. The thickness of the heat insulating layer accounts for 50%-90% of the total thickness of the double layers, and the heat conductivity of a second thermal barrier coating material and a third thermal barrier coating material does not exceed 2.5 W / m.K at the temperature of 1,000-1,600 DEG C. According to the thermal barrier coating ofthe double-layer structure, the purpose of sintering resistance of the ceramic coating in the high-temperature environment can be achieved, by means of the design of the toughening layer, the worsening influences of heat insulating holes on the service life are offset, and therefore collaborative design of sintering resistance and long service life of the thermal barrier coating of the novel structure is achieved.

Description

technical field

[0001] The invention belongs to the technical field of coatings, in particular to a thermal barrier coating and a preparation method thereof. Background technique

[0002] The materials of the hot end components of aero-engines and gas turbines are mostly high-temperature alloys. At present, the temperature limit of the most advanced single crystal superalloy does not exceed 1000°C, but the service temperature of the hot end components inside the engine has far exceeded the temperature limit of the superalloy. Moreover, with the continuous improvement of the thrust-to-weight ratio of the aero-engine, the service temperature inside the engine will become higher and higher. Therefore, in order to make superalloys work stably in an environment far exceeding their temperature limit, it is necessary to provide thermal insulation "protective clothing" for alloy components, that is, thermal barrier coatings (Thermal barrier coatings, TBCs). TBCs can effectively is...

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