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: 2021-08-17
KUNMING UNIV OF SCI & TECH
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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.

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  • High-entropy stable rare earth tantalate/niobate ceramic and preparation method thereof
  • High-entropy stable rare earth tantalate/niobate ceramic and preparation method thereof
  • High-entropy stable rare earth tantalate/niobate ceramic and preparation method thereof

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[0034] against the current A 3 BO 7 type rare earth tantalum / niobate and A 2 B 2 o 7 Type rare earth zirconium / titanium / tin / hafnate ceramics have problems such as low coefficient of thermal expansion, poor fracture toughness and insufficient thermal radiation resistance. The present invention provides a high-entropy stable rare earth tantalate / niobate ceramic The preparation method comprises the steps of:

[0035] RE 2 o 3 (RE is a 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 can replace the rare earth and tantalum / niobium elements at the A and B positions in equal quantities, and maintain the electronegativity of the crystal lattice to obtain a compoun...

Embodiment 1

[0053] Preparation A 3 BO 7 Type Gd 2.6 Ta 0.3 Nb 0.3 Ti 0.2 Zr 0.2 f 0.2 sn 0.2 o 7 High-entropy ceramics, the specific steps are as follows:

[0054] Raw material Gd 2 o 3 、 Ta 2 o 5 , Nb 2 o 5 and MO 2 (M=Sn, Ti, Zr, Hf) were 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 the raw material powder is cooled to room temperature, and the cooled raw material powder, alcohol and zirconia ball are placed in a ball mill tank according to the mass ratio of 1:2:3 for ball mill mixing, and the speed of ball milling is 600 rpm , the ball milling time was 36 hours, and then the uniformly mixed powder was kept at 100° C. for 5 hours for drying treatment, and finally sieved with 400 meshes to obtain a fine powder. Weigh about 2.0g of the sieved powder and place it in a graphite grin...

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 f 0.25 sn 0.25 o 7 ,Specific steps are as follows:

[0057] Raw material Yb 2 o 3 、 Ta 2 o 5 , Nb2 o 5 and MO 2 (M=Sn, Ti, Zr, Hf) were 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 the raw material powder is cooled to room temperature, and the cooled raw material powder, alcohol and zirconia ball are placed in a ball mill tank according to the mass ratio of 1:2:2 for ball mill mixing, and the speed of ball milling is 300 rpm , the ball milling time is 12 hours, and then the uniformly mixed powder is kept at 90° C. for 8 hours for drying treatment, and finally sieved with 200 meshes to obtain a fine powder. Weigh about 2.0g of the sieved powder and place it in a graphite grinding tool for developm...

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Abstract

The invention discloses a high-entropy stable rare earth tantalate/niobate ceramic and a preparation method thereof, and the preparation method comprises the following steps: taking rare earth oxide RE2O3, tantalum oxide Ta2O5, niobium oxide Nb2O5 and MO2 oxide as raw materials, and taking A3BO7 type rare earth tantalate/niobate RE<3>Ta<1-x> Nb<x>O<7> ceramic as a matrix, and adding three or more MO2 oxides to equivalently replace rare earth and tantalum/niobium elements at positions A and B to obtain the novel 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, controllable crystal structure and the like, and can be used as a high-temperature protection material for thermal barrier coatings, environmental barrier coatings, nuclear material storages and the like.

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 the 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, etc., to meet the above The advantages of low material 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 / hafnate ceramics (both A sites are rare earth elements) have the adv...

Claims

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Application Information

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Patent Type & Authority Applications(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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