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High-entropy rare earth zirconate ceramic capable of simultaneously stabilizing A-site and B-site cations and preparation method of high-entropy rare earth zirconate ceramic

A cation and zirconate technology, applied in the field of materials science and engineering, can solve the problems of the use of nuclear waste storage materials, insufficient oxygen transmission capacity, and insufficient thermal expansion coefficient, etc., to achieve inhibition of grain growth, lower temperature, and high density Effect

Active Publication Date: 2021-10-22
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current problems of rare earth zirconate oxide ceramic materials with fluorite-type and pyrochlore-type structures are mainly poor high-temperature stability, and phase transition will occur at temperatures above 1500°C; poor nuclear radiation resistance, and cannot be used as nuclear waste storage materials for a long time Use; high temperature thermal conductivity and insufficient thermal expansion coefficient when used as a thermal barrier coating; insufficient oxygen transport capacity when used as a solid oxide fuel cell, etc.

Method used

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  • High-entropy rare earth zirconate ceramic capable of simultaneously stabilizing A-site and B-site cations and preparation method of high-entropy rare earth zirconate ceramic
  • High-entropy rare earth zirconate ceramic capable of simultaneously stabilizing A-site and B-site cations and preparation method of high-entropy rare earth zirconate ceramic
  • High-entropy rare earth zirconate ceramic capable of simultaneously stabilizing A-site and B-site cations and preparation method of high-entropy rare earth zirconate ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) According to A 2 B 2 o 7 The chemical formula was measured and weighed A 2 o 3 and BO 2 Oxide, wherein A is a mixture of La, Eu, Gd, Dy and Ho with the same molar content, B is a mixture of Ce, Sn, Ti, Zr and Hf with the same molar content, then placed in a high temperature furnace at 900 ℃ for 2 hours to remove organic impurities contained in the powder and reduce the reactivity of the raw material powder, and obtain powder C after cooling down.

[0027] (2) Put powder C, alcohol, and zirconia balls in a ball milling tank at a mass ratio of 1:2:3 for ball milling. The speed of ball milling is 300 revolutions per minute, and the milling time is 12 hours. The powder was dried at 90° C. for 8 hours, and finally sieved to 300 mesh to obtain powder D.

[0028] (3) The powder D is placed in a graphite mold for development and shaping, and then placed in a spark plasma sintering system for high-temperature and high-pressure sintering. The sintering condition is 1400...

Embodiment 2

[0031] (1) According to A 2 B 2 o 7 The chemical formula was measured and weighed A 2 o 3 and BO 2 Oxide, where A is a mixture of Eu, Gd, Dy and Ho with the same molar content, B is a mixture of Ce, Sn, Ti, Zr and Hf with the same molar content, then placed in a high temperature furnace at 600 °C 10 hours to remove the organic impurities contained in the powder and reduce the reactivity of the raw material powder, and obtain powder C after cooling down.

[0032] (2) Put powder C, alcohol, and zirconia balls in a ball milling tank at a mass ratio of 1:2:3 for ball milling. The speed of ball milling is 500 revolutions per minute, and the milling time is 6 hours. The powder was dried at 100° C. for 4 hours, and finally sieved with 200 mesh to obtain powder D.

[0033] (3) The powder D is placed in a graphite mold for development and shaping, and then placed in a spark plasma sintering system for high-temperature and high-pressure sintering. The sintering condition is 1200°C...

Embodiment 3

[0036] (1) According to A 2 B 2 o 7 The chemical formula was measured and weighed A 2 o 3 and BO 2 Oxide, wherein A is a mixture of La, Sm, Eu, Gd, Dy and Ho with the same molar content, B is a mixture of Sn, Ti, Zr and Hf with the same molar content, then placed in a high temperature furnace at 1200 ℃ for 2 hours to remove organic impurities contained in the powder and reduce the reactivity of the raw material powder, and obtain powder C after cooling down.

[0037] (2) Put powder C, alcohol and zirconia grinding balls in a ball milling jar according to the mass ratio of 1:2:3 for ball milling and mixing. The powder was dried at 70° C. for 10 hours, and finally sieved with 500 mesh to obtain powder D.

[0038] (3) The powder D is placed in a graphite mold for development and shaping, and then placed in a spark plasma sintering system for high-temperature and high-pressure sintering. The sintering condition is 1600°C-100MPa-5min to obtain a sintered bulk ceramic.

[003...

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Abstract

The invention discloses high-entropy rare earth zirconate ceramic capable of simultaneously stabilizing A-site and B-site cations and a preparation method of the high-entropy rare earth zirconate ceramic. The rare earth zirconate ceramic comprises a substance with a chemical formula of A2B2O7, wherein the A-site cation is a mixture of four or more metal cations of Sc, Y, La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu, and different metal cations in the A site have the same molar content; the B-site cation is a mixture of three or more metal cations of Ti, Hf, Sn, Th and Ce and Zr ions, and different metal cations in the B site have the same molar content. The rare earth zirconate ceramic prepared by the invention has the characteristics of low thermal conductivity, high hardness, excellent fracture toughness, high phase purity, high density and the like.

Description

technical field [0001] The invention belongs to the field of material science and engineering technology, in particular to a rare earth zirconate ceramic with high entropy and stable A-site and B-site cations and a preparation method thereof. Background technique [0002] High-temperature structural ceramics require materials with high melting point, excellent high-temperature stability, outstanding mechanical properties (high hardness, high Young's modulus and high fracture toughness) and chemical stability. The advantages of low preparation cost, simple preparation process and wide source of raw materials will promote the large-scale application of materials. [0003] Rare earth oxide ceramic materials with fluorite-type and pyrochlore-type structures have been applied in many fields, such as high-temperature blade surface protective coatings, rocket engine protective coatings and acid and alkali corrosion protection, solid oxide fuel cells, nuclear waste storage and wear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/49C04B35/622C04B35/64
CPCC04B35/50C04B35/49C04B35/622C04B35/64C04B2235/3227C04B2235/3224C04B2235/3229C04B2235/3293C04B2235/3232C04B2235/3244
Inventor 冯晶陈琳李柏辉郭俊王建坤张陆洋徐浩
Owner KUNMING UNIV OF SCI & TECH
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