A high-irradiation-resistant cerium-zirconate ceramic material for nuclear reactor control rods and a preparation method and application thereof

By preparing (Eu1/3Dy1/3Tm1/3)2Zr2O7 ceramic material, the performance degradation problem of existing control rod materials under high irradiation environment was solved, and the comprehensive excellent performance of high radiation resistance, low reactivity loss and low thermal expansion coefficient was achieved, ensuring the safe and stable operation of nuclear reactors.

CN120040178BActive Publication Date: 2026-03-31SICHUAN UNIV +2
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Patent Information

Application Number
CN202510113528.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-01-24
Publication Date
2026-03-31
Estimated Expiration
2045-01-24

AI Technical Summary

Technical Problem

Existing control rod materials suffer from problems such as radiation swelling, embrittlement, and phase transition under high radiation environments, leading to performance degradation. This makes it difficult to simultaneously meet the requirements of high radiation resistance, low reactivity loss, high thermal conductivity, and low coefficient of thermal expansion, thus affecting the safe and stable operation of nuclear reactors.

Method used

A (Eu1/3Dy1/3Tm1/3)2Zr2O7 ceramic material was prepared by mixing three rare earth oxides (Eu2O3, Dy2O3 and Tm2O3) with zirconium oxide (ZrO2) in a specific ratio and then ball milling, dry pressing, cold isostatic pressing and high-temperature sintering. The material exhibits excellent radiation resistance, low reactive energy loss and low coefficient of thermal expansion.

Benefits of technology

This achievement enabled high density and excellent mechanical properties of ceramic materials, significantly improved the radiation resistance of neutron control rods, reduced reactive value loss and thermal expansion coefficient, and ensured the safe and reliable operation of the nuclear reactor.

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Abstract

The present application relates to a kind of high radiation resistance of control rod for stack entropy rare earth zirconate ceramic material and its preparation method and application, belong to nuclear reactor neutron absorption rod material technical field.The control rod ceramic material provided by the present application is prepared by using europium oxide, dysprosium oxide, thulium oxide and zirconium oxide as raw materials, according to certain proportion, after ball milling, calcination, green body forming and green body sintering process, and then processing to obtain the middle entropy rare earth zirconate ceramic material that can be applied to control rod.The rare earth zirconate ceramic material has excellent radiation resistance, large neutron absorption cross section and low reactivity value loss, and has high density, excellent thermal conductivity and low thermal expansion coefficient, and shows good application prospect in the field of control rod materials.
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