Pyrochlore structure high-entropy ceramic solidified body material as well as preparation method and application thereof

By combining heat treatment and spark plasma sintering of powder, the problem of grain coarsening in the preparation of ceramic solidified materials was solved, and the rapid preparation of high-density and high-entropy ceramic solidified materials with pyrochlore structure was achieved, improving the irradiation and chemical stability of the materials.

CN121405463APending Publication Date: 2026-01-27XI AN JIAOTONG UNIV
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Patent Information

Application Number
CN202511608902.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-05
Publication Date
2026-01-27

AI Technical Summary

Technical Problem

Existing ceramic solidified materials suffer from problems such as grain coarsening, insufficient chemical stability, and insufficient irradiation stability during the preparation process. Traditional sintering methods are time-consuming and difficult to achieve high density. Although spark plasma sintering technology has improved this, grain growth is still unavoidable, leading to a decline in material performance.

Method used

The powder is pretreated by heat treatment technology to form a uniform pyrochlore phase, and then densification is achieved at low temperature and short time by spark plasma sintering to inhibit grain growth. Combined with SPS technology, sintering is carried out under axial pressure to ensure the uniformity and density of the material.

Benefits of technology

Significantly reducing grain size improves the irradiation stability, chemical stability, and mechanical properties of pyrochlore materials, enabling the rapid preparation of high-density ceramic solidified materials.

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Abstract

The invention discloses a pyrochlore structure high-entropy ceramic solidified body material as well as a preparation method and application thereof, and belongs to the technical field of nuclear waste solidification. The preparation method of the high-entropy ceramic solidified body material with the pyrochlore structure comprises the following steps: weighing raw material powder of La2O3, Nd2O3, Sm2O3, Gd2O3, Eu2O3 and ZrO2 according to the proportion in (La0. 2Nd0. 2Sm0. 2Gd0. 2Eu0. 2) 2Zr2O7; the weighed raw material powder is subjected to ball milling treatment, and ball-milled powder is obtained; under the inert gas atmosphere, the ball-milled powder is subjected to heat treatment, and heat-treated powder is obtained; and carrying out spark plasma sintering on the heat treatment powder to obtain the pyrochlore structure high-entropy ceramic solidified body material. The powder is treated by using a heat treatment technology, so that the powder is homogenized, a pyrochlore phase is formed, grain growth is more favorably inhibited, a fine grain structure is obtained, and the irradiation stability and the mechanical property of the pyrochlore material are improved.
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