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A kind of high-entropy stable rare earth tantalate/niobate ceramic and preparation method thereof

A technology of niobate and tantalate, which is applied in the field of high-entropy stable rare earth tantalate/niobate ceramics and its preparation, can solve the problems of low thermal expansion coefficient, insufficient thermal radiation resistance, and poor fracture toughness, and achieve Improves purity, inhibits grain growth and precipitated phase generation, and has the effect of high density

Active Publication Date: 2022-07-22
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of high-entropy stable rare earth tantalate / niobate ceramics and preparation method thereof, for solving A 3 BO 7 type rare earth tantalum / niobate and A 2 B 2 o 7 Rare earth zirconium / titanium / tin / hafnate ceramics have problems such as low thermal expansion coefficient, poor fracture toughness and insufficient thermal radiation resistance.

Method used

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  • A kind of high-entropy stable rare earth tantalate/niobate ceramic and preparation method thereof
  • A kind of high-entropy stable rare earth tantalate/niobate ceramic and preparation method thereof
  • A kind of high-entropy stable rare earth tantalate/niobate ceramic and preparation method thereof

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preparation example Construction

[0034] for the current A 3 BO 7 Type Rare Earth Tantalum / Niobate and A 2 B 2 O 7 The rare earth zirconium / titanium / tin / hafnium salt ceramic has the problems of low thermal expansion coefficient, poor fracture toughness and insufficient thermal radiation resistance. The invention provides a high entropy stable rare earth tantalate / niobate ceramic. The preparation method includes the following steps:

[0035] rare earth oxide RE 2 O 3 (RE is rare earth element), tantalum oxide Ta 2 O 5 , Niobium oxide Nb 2 O 5 and MO 2 (M=Sn, Ti, Zr, Hf) oxide (M is selected from at least one of Sn, Ti, Zr, Hf) as raw material, with A 3 BO 7 Type Rare Earth Tantalum / Niobate RE 3 Ta 1-x Nb x O 7 Ceramic as the matrix, adding three or more different types of MO with the same content (or molar ratio) 2 The oxide realizes the heterovalent and equal substitution of the rare earth and tantalum / niobium elements at the A and B positions, and maintains the balance of the lattice electron...

Embodiment 1

[0053] Preparation A 3 BO 7 type Gd 2.6 Ta 0.3 Nb 0.3 Ti 0.2 Zr 0.2 hf 0.2 Sn 0.2 O 7 High-entropy ceramics, the specific steps are as follows:

[0054] The raw material Gd 2 O 3 , Ta 2 O 5 , Nb 2 O 5 and MO 2 (M=Sn, Ti, Zr, Hf) are weighed according to the stoichiometric ratio, and then placed in a high-temperature furnace at 1200 ° C for 5 hours to remove organic impurities contained in the raw material powder and reduce the reactivity of the raw material powder; Then cool the raw material powder to room temperature, and place the cooled raw material powder, alcohol and zirconia grinding balls in a ball-milling tank according to the mass ratio of 1:2:3 for ball-milling mixing, and the rotation speed is 600 rpm during ball-milling , the ball milling time is 36 hours, and then the mixed powder is kept at 100 ° C for 5 hours for drying treatment, and finally sieved with 400 mesh to obtain fine powder. Weigh about 2.0g of the sieved powder and place it in a grap...

Embodiment 2

[0056] Preparation A 2 B 2 O 7 Type Yb 2.5 Ta 0.25 Nb 0.25 Ti 0.25 Zr 0.25 hf 0.25 Sn 0.25 O 7 ,Specific steps are as follows:

[0057] The raw material Yb 2 O 3 , Ta 2 O 5 , Nb2 O 5 and MO 2 (M=Sn, Ti, Zr, Hf) are weighed according to the stoichiometric ratio, and then placed in a high-temperature furnace at 800 ° C for 2 hours to remove organic impurities contained in the raw material powder and reduce the reactivity of the raw material powder; Then cool the raw material powder to room temperature, and place the cooled raw material powder, alcohol and zirconia grinding balls in a ball-milling tank according to the mass ratio of 1:2:2 for ball-milling mixing, and the rotation speed is 300 rpm during ball-milling , the ball milling time is 12 hours, and then the mixed powder is kept at 90 ° C for 8 hours for drying treatment, and finally sieved with 200 mesh to obtain fine powder. Weigh about 2.0g of the sieved powder and place it in a graphite grinding tool f...

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Abstract

The invention discloses a high-entropy stable rare earth tantalate / niobate ceramic and a preparation method thereof, comprising the following steps: using rare earth oxide RE 2 O 3 , tantalum oxide 2 O 5 , Niobium oxide Nb 2 O 5 and MO 2 Oxides as raw materials, with A 3 BO 7 Type Rare Earth Tantalum / Niobate RE 3 Ta 1‑ x Nb x O 7 Ceramic as the matrix, adding three or more MO 2 Oxide substitutes the rare earth and tantalum / niobium elements at the A and B positions in equal amounts to obtain a new high-entropy stable rare earth tantalate / niobate ceramic material RE 3‑y Ta 1‑y / 2‑x Nb x‑y / 2 M 2y O 7 . The ceramic material prepared by the invention has the characteristics of low thermal conductivity, high thermal expansion coefficient, high hardness, high fracture toughness and controllable crystal structure, etc., and can be used as high temperature protective materials such as thermal barrier coating, environmental barrier coating and nuclear material storage. use.

Description

technical field [0001] The invention relates to the technical field of high-temperature structural ceramic materials, in particular to a high-entropy stable rare earth tantalate / niobate ceramic and a preparation method thereof. Background technique [0002] The application environment of thermal barrier coatings and environmental barrier coatings requires that their ceramics have the characteristics of high melting point, excellent high temperature stability, high hardness, high fracture toughness, low thermal conductivity, excellent thermal radiation resistance and high thermal expansion coefficient. The advantages of low preparation cost, simple preparation process and wide source of raw materials under various conditions will promote the large-scale application of materials. A 3 BO 7 Type Rare Earth Tantalum / Niobate and A 2 B 2 O 7 The rare earth zirconium / titanium / tin / hafnium salt ceramics (A site are all rare earth elements) have the advantages of low thermal condu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/495
CPCC04B35/50C04B35/495C04B2235/3293C04B2235/3232C04B2235/3244C04B2235/3225C04B2235/3227C04B2235/666
Inventor 陈琳冯晶李柏辉王建坤张陆洋徐浩
Owner KUNMING UNIV OF SCI & TECH
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