Anti-oxidation MCrAlY fine-grain protective coating material and preparation method thereof

Abstract

The invention relates to the technical field of coatings, and particularly relates to an anti-oxidation MCrAlY fine-grain protective coating material and a preparation method thereof. The anti-oxidation MCrAlY fine-grain protective coating material comprises a high-temperature alloy matrix, an MCrAlY protective coating, and a super-fine grain remelting layer. The invention further discloses a preparation method of the anti-oxidant MCrAlY fine-grain protective coating material, namely, an MCrAlY protective coating with a super-fine grain structure is prepared by adopting an air plasma spraying (APS) and high current pulsed electron beam (HCPEB) compounding technology. The MCrAlY protective coating with the super-fine grain structure, prepared by adopting the compounding technology, is capable of accelerating selective oxidation of an Al element, and promoting the coating to rapidly form a continuous and compact oxidation film within a short time, thereby reducing the consumption of an oxidation film generating element in the oxidation process, and further improving the anti-oxidation capacity of the coating.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to an oxidation-resistant MCrAlY fine-grain protective coating material and a preparation method thereof. Background technique [0002] In the fields of modern energy and aviation and aerospace industries, in order to improve the performance index of the power system, higher and higher requirements are put forward for the performance of superalloys and their protective coating materials; in practical applications, superalloys mainly bear loads Therefore, it is particularly urgent to measure the high temperature oxidation resistance of protective coating materials, study its oxidation and failure mechanism, and find ways to improve the high temperature oxidation performance. [0003] MCrAlY (M is a transition metal Ni, Co, or a mixture of Ni and Co) coating is widely used in the production of gas turbine blades with high operating parameters and harsh environments due to its excelle...

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Problems solved by technology

[0003] MCrAlY (M is a transition metal Ni, Co, or a mixture of Ni and Co) coating is widely used in the production of gas turbine blades with high operating parameters and harsh environments due to its excellent resistance to high temperature oxidation and hot corrosion resistance Anti-oxidation protective coating and thermal barrier coating bonding layer on the coating; there are many coating preparation processes, including electron beam physical vapor deposition (EB-PVD), plasma spraying (PS), detonation spraying (DS) and high-speed Oxygen flame spraying (HVOF), etc.; Among them, plasma spraying technology has become the main preparation method of MCrAIY protective coating due to its low cost, high production efficiency, wide adjustable range of spraying thickness, and easy control of composition; but the coating prepared by plasma spraying There are more porosity and holes in the layer and the interface of the lamellar structure, which may become channels for the intrusion of oxygen, sulfur and other elements, which will affect the formation and growth of the oxide film, and eventually cause the coating to crack or fall off easily.

[0004] For a long time, the research work of protective coatings has been carried out from the two aspects of preparation process improvement and coating structure control, in order to achieve the goal of improving oxidation resistance; however, the complexity, stability and economy associated with process improvement and other factors greatly restrict its wide application in the field of coating technology; in contrast, the method of structure control, such as the use of composite technology with fine-grained microstructure characteristics to obtain fine-grained coatings, can well solve the above problems. question

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