Thermal-barrier coating and method for making same

Abstract

A thermal barrier coating and the preparation method of the thermal barrier coating relate to a coating and the preparation of the coating, in which the issues that the relative sliding and falling of the material interface parallel to the direction of the high temperature nickel-based alloy and the vertical cracking of the thermal barrier coating perpendicular to the direction of high temperature nickel-based alloy in high temperature and in the prior art are resolved. The thermal barrier coating is composed of an external ceramic layer (1) and an internal combined layer (5), wherein the internal combined layer (5) is composed of a high temperature nickel-based alloy layer (4) and a bonding layer (2) linked with the external surface of the high temperature nickel-based alloy layer (4). The bonding layer (2) is composed of a nickel nano-wire (3) and yttria stabilized zirconia. According to the preparation, the nickel nano-wire connected to the high temperature nickel-based alloy layer is obtained through the electro-deposition on the outer surface of the high temperature nickel-based alloy layer. And then the sol of yttria stabilized zirconia is sprayed, and the bonding layer (2) is obtained after the calcinations. Afterwards the ceramic layer (1) is prepared on the bonding layer (2), so that the thermal barrier coating is obtained. In the invention, the horizontal and vertical directions of the thermal barrier coating are closely integrated.

Description

technical field [0001] The invention relates to a coating and a preparation method thereof. Background technique [0002] Thermal barrier coatings have been widely used in many fields such as aviation, aerospace, gas power generation, metallurgy, shipbuilding, chemical industry and automobile manufacturing. The development of science and technology has put forward higher and higher requirements on the working temperature and service life of the hot end components. Therefore, it is necessary to vigorously develop thermal barrier coatings with high performance, high reliability and long life. Traditional thermal barrier coatings are usually composed of a ceramic surface layer and a bonded bottom layer. The thermal barrier coating structure can be mainly divided into two-layer structure, multi-layer structure and gradient structure. Due to the complexity and diversity of thermal barrier coating conditions, thermal barrier coatings often lead to failure. The failure of existi...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems in the prior art that the material interface in the direction parallel to the nickel-based superalloy layer is relatively sliding and falling off and the thermal barrier coating is vertically cracked in the direction perpendicular to the nickel-based superalloy layer. Provide a thermal barrier coating and its preparation method

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