A near-stoichiometric entropy oxide ceramic and a method of making the same

By using near-equimolar ratio medium-entropy oxide ceramics (ZrxHfyMoz)O2 and spark plasma sintering technology, the problems of melting point enhancement and stability of existing high-temperature resistant oxide ceramics at extreme temperatures have been solved, realizing a ceramic material with high density and structural stability suitable for extreme thermal environments.

CN122355704APending Publication Date: 2026-07-10ZHENGZHOU UNIV
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202610823785.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-09
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing high-temperature resistant oxide ceramics are insufficient to meet the application requirements of extreme temperature environments above 3000℃, and traditional doping methods are difficult to balance between increasing the melting point and maintaining the stability of the high-temperature phase.

Method used

A medium-entropy oxide ceramic (ZrxHfyMoz)O2 with a near equimolar ratio was used. Mo element was introduced to form a high-strength covalent bond network. The complete solid solution and uniform distribution of each component were achieved by precise control through discharge plasma sintering process, forming a single-phase solid solution.

Benefits of technology

It significantly increases the liquidus temperature of ceramic materials, extends the phase lifetime at extreme high temperatures, achieves high density and structural stability, is suitable for extreme thermal environments, and is feasible for industrial production.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122355704A_ABST
    Figure CN122355704A_ABST
Patent Text Reader

Abstract

This invention relates to the field of refractory ceramics technology, specifically to a near-equimolar ratio medium-entropy oxide ceramic and its preparation method. ZrO2, HfO2, and MoO2 powders are mixed in a specific ratio, and then subjected to planetary ball milling, rotary drying, grinding, and sieving with anhydrous ethanol as a dispersant to obtain a uniform mixed raw material powder. The powder is then loaded into a graphite mold and placed in a discharge plasma sintering furnace, where it undergoes segmented heating and pressurization sintering at 50 MPa: first, the temperature is increased to 1000℃ at 100℃ / min, then increased to 1500-1650℃ at 30-40℃ / min and held for 20 min, followed by cooling to 1000℃ at 50℃ / min, and finally depressurized below 1000℃ and cooled with the furnace. The ZrO2 prepared by this invention… 0.3125 Hf 0.375 Mo 0.3125 O2 ternary oxide ceramics are characterized by high density and uniform component distribution. With a melting point as high as about 2960℃, they are suitable for ultra-high temperature fields such as aerospace thermal protection.
Need to check novelty before this filing date? Find Prior Art