Thermal barrier coating powder and method for producing the same, thermal barrier coating

By mechanically and chemically grinding and surface hydroxylation of MAX phase powder, combined with double titration co-precipitation and microwave hydrothermal treatment, a dense YSZ shell is formed, which solves the problems of easy oxidation and uneven distribution of MAX phase and improves the performance of thermal barrier coating.

CN122169011BActive Publication Date: 2026-07-28XIAN RARE METAL MATERIALS RES INST CO LTD
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Patent Information

Application Number
CN202610646756.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-05-12
Publication Date
2026-07-28
Estimated Expiration
2046-05-12

AI Technical Summary

Technical Problem

In the prior art, when YSZ and MAX phase powders are simply physically mixed and then thermally sprayed, the MAX phase is easily oxidized and decomposed, failing to provide effective protection at the microscale, resulting in the loss of toughening effect. Furthermore, the two phases are unevenly distributed, making it difficult to achieve excellent performance in thermal barrier coatings.

Method used

By mechanically and chemically grinding and surface hydroxylation of MAX phase powder, YSZ precursor is uniformly coated on the surface of MAX phase core using a double titration co-precipitation method. YSZ is then crystallized in situ through microwave hydrothermal treatment to form a dense YSZ shell. Combined with microwave hydrothermal low-temperature crystallization technology, the uniformity of the core-shell structure and the interfacial bonding strength are ensured.

Benefits of technology

Effective oxidation protection of the MAX phase was achieved, ensuring the uniform distribution of the two phases, improving the fracture toughness and thermal shock resistance of the thermal barrier coating, enhancing the thermal barrier performance of YSZ and the high toughness of the MAX phase, resulting in a synergistic multiplication of material properties.

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Abstract

The present disclosure provides a thermal barrier coating powder and a preparation method thereof, and a thermal barrier coating, and relates to the technical field of high-temperature protective coating materials. The method comprises: performing mechanical-chemical grinding and surface hydroxylation treatment on a MAX phase powder; dispersing an activated MAX phase core in a liquid phase, uniformly coating a YSZ precursor on the surface of the core through double titration co-precipitation to obtain a core-shell structure precursor slurry; performing microwave hydrothermal treatment to in-situ crystallize the YSZ precursor to form a YSZ shell layer on the surface of the MAX phase core, thereby obtaining a core-shell structure unit; the core-shell structure unit has a core-shell structure composed of a MAX phase core and a YSZ shell; performing post-treatment and spray drying on the core-shell structure unit to obtain a thermal barrier coating powder; and the powder is obtained by agglomeration of multiple core-shell structure units. The interface between the core and the shell of the powder obtained by the method is firmly combined, can provide oxidation protection for the inner core of the MAX phase in coating preparation processes such as thermal spraying, and significantly improves the fracture toughness and thermal shock resistance of the thermal barrier coating.
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