High-entropy ceramic powder for thermal barrier coating and preparation method thereof

Abstract

The invention discloses a high-entropy ceramic powder for thermal barrier coating, which is characterized in that the ceramic powder has a pyrochlore structure, and the chemical formula is RE 2 Zr 2 o 7 , wherein RE is any 3 to 7 different metal elements among the rare earth elements Y, La, Pr, Nd, Sm, Eu and Gd, and the percentage of the moles of each RE element to the total moles of all RE elements is 5%~ 35%. The preparation method is: the RE 2 o 3 Powder and ZrO 2 The powders are mixed, and the mixed powders are heated at 1000-1700° C. in an air atmosphere for 1-10 hours to prepare high-entropy ceramic powders. The high-entropy ceramic powder prepared by the present invention enriches the system of thermal barrier coating materials, has the advantages of low cost, simple operation, wide application range, etc., and is expected to be applied in the field of thermal barrier coatings.

Description

technical field

[0001] The invention relates to a high-entropy ceramic powder for thermal barrier coatings and a preparation method thereof, belonging to the technical field of thermal barrier coating materials. Background technique

[0002] Pyrochlore-structured rare earth zirconates (RE 2 Zr 2 o 7 , wherein, RE is a rare earth element, or doped with another rare earth element) has low thermal conductivity, is compatible with metal substrates, has high stability at high temperatures and good sintering resistance, etc., and can be used as a thermal Barrier coating materials are used. For example, it is applied to the surface of metal alloys of gas turbines or jet engines to protect the metal substrate from overheating and failure during long-term service. RE 2 Zr 2 o 7 Its low thermal conductivity is better than that of YSZ, which is widely used at present, and its phase and structure are still stable during high temperature and long-term use. It can even increase the...

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