High-entropy rare earth zirconate nano aerogel as well as preparation method and application thereof

Abstract

The invention discloses high-entropy rare earth zirconate nano aerogel as well as a preparation method and application thereof, and belongs to the technical field of ultrahigh-temperature ceramic materials. Phenolic resin, organic silicon resin or polyimide is used as a template, the high-entropy rare earth zirconate nano aerogel is obtained through a sol-gel method in combination with a supercritical drying technology and a high-temperature calcination means, the nanopore of the high-entropy rare earth zirconate nano aerogel is 40-60 nm, and compared with similar high-entropy rare earth zirconate powder particles, the high-entropy rare earth zirconate nano aerogel has high specific surface area and high-temperature stability, and can be widely applied to the fields of high-temperature thermal insulation materials, catalytic materials, ion conductor materials, electrolyte materials, thermal barrier coatings, radioactive nuclear waste treatment and the like. In addition, the preparation method of the material is simple, convenient and effective, the use cost is low, the synthesis efficiency is high, and large-scale production of the high-entropy rare earth zirconate nano aerogel is facilitated.

Description

technical field [0001] The invention relates to the technical field of ultra-high temperature ceramic materials, in particular to a high-entropy rare earth zirconate nano-airgel and its preparation method and application. Background technique [0002] High-entropy ceramics (HECs) are ceramic materials prepared using the concept of entropy stabilization. They generally contain 5 or more elements that are thermodynamically chaotic and distributed in the material system, and the content of each element is 5-35%. Similar to the case of high-entropy alloys, multiple host elements in HECs generate maximum configurational entropy at near equimolar concentrations, which often contribute to their unique structures, properties, and potential applications. This high entropy effect can effectively improve the thermodynamic stability of the material, reduce the sintering temperature of the material, improve the mechanical properties of the material, facilitate the formation of a simple c...

AI Technical Summary

Problems solved by technology

The structure of the material determines the properties. When the size of the rare earth zirconate material is reduced to the nanometer level, the increase in the grain boundaries between the particles will enhance the phonon scattering effect of the material, thus reducing the thermal conductivity of the material.

In addition, compared with rare earth oxides, during high-temperature sintering, the decomposition of rare earth nitrates and the rearrangement reactions between Zr, O, and RE elements are carried out simultaneously, which will greatly reduce the activation energy required for the reaction.

[0006] However, how to overcome the problems of high preparation temperature, high pressure required, cumbersome process, large material size, poor mechanical properties and difficult sol preparation of airgel of high-entropy rare earth elements in the HE-REZ ceramic materials prepared by the existing technology, and prepare a A kind of high-entropy rare earth zirconate nano-airgel with high specific surface area and high temperature stability has become a difficult problem to be solved urgently by those skilled in the art

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