Nanocrystalline A4B2O9 type tantalate ceramic prepared through ultralow-temperature sintering and method thereof

A technology of A4B2O9 and tantalate is applied in the field of ultra-low temperature sintering to prepare nanocrystalline A4B2O9 type tantalate ceramics, which can solve the problem of high cost

Active Publication Date: 2021-06-18
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention intends to provide a method for preparing nanocrystalline A4B2O9 tantalate ceramics by ultra-low temperature sintering, so as to solve the problem of high cost of existing thermal barrier coating and environmental barrier coating materials

Method used

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  • Nanocrystalline A4B2O9 type tantalate ceramic prepared through ultralow-temperature sintering and method thereof
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  • Nanocrystalline A4B2O9 type tantalate ceramic prepared through ultralow-temperature sintering and method thereof

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Embodiment 1

[0036] A nanocrystalline A4B2O9 type tantalate ceramic prepared by ultra-low temperature sintering, the structural formula of the ceramic is Ca 4 Ta 2 o 9 , its preparation method comprises the following steps:

[0037] step one,

[0038] Ca(OH) 2 , CaCO 3 and Tan oxalate were kept at 350-900°C for 1-2h respectively. During the heat preservation process, the raw materials were thermally decomposed to obtain highly reactive CaO and Ta 2 o 5 powder. In this embodiment, the heat preservation temperature is preferably 900° C., and the heat preservation time is preferably 1 h.

[0039] step two,

[0040] According to Ca 4 Ta 2 o 9 The structural formula weighs highly reactive CaO and Ta 2 o 5 powder, and will highly reactive CaO and Ta 2 o 5 Put the powder into the high-energy ball mill, and then put alcohol with a concentration of 99.99% into the high-energy ball mill. The weight ratio of powder to alcohol is 1:6-10, and the CaO and Ta 2 o 5 The powder is ground, ...

Embodiment 2

[0044] The difference between embodiment 2 and embodiment 1 is that the structural formula of the A4B2O9 type tantalate ceramics in this embodiment is Ni 4 Ta 2 o 9 , its preparation method is consistent with Example 1.

Embodiment 3

[0046] The difference between embodiment 3 and embodiment 1 is that the structural formula of the A4B2O9 type tantalate ceramics in this embodiment is Co 4 Ta 2 o 9 , its preparation method is consistent with Example 1.

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Abstract

The invention belongs to the technical field of thermal barrier coating materials, and discloses nanocrystalline A4B2O9 type tantalate ceramic prepared through ultralow-temperature sintering and a method thereof. The structural formula of the ceramic is A4B2O9, wherein A is one or more of Ni, Co, Mg, Ca, Sr, Ba or Zn, and B is Ta. The preparation method of the ceramic comprises the following steps: respectively carrying out heat preservation on A(OH)2, ACO3 and tantalum oxalate at 350-900 DEG C for 1-2 hours for thermal decomposition to obtain AO and Ta2O5 powder with high reaction activity; grinding the AO powder and the Ta2O5 powder to obtain a nanoscale powder mixture with high reaction activity; and finally, carrying out spark plasma sintering on the powder mixture with high reaction activity to prepare the blocky A4B2O9 type tantalate ceramic. The invention solves the problem of high cost of the existing thermal barrier coating and environmental barrier coating material.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier coating materials, and in particular relates to an ultra-low temperature sintering method for preparing nanocrystalline A4B2O9 tantalate ceramics. Background technique [0002] In recent years, the rapid development of thermal barrier coating and environmental barrier coating materials has led to the continuous development and application of oxide ceramics with different crystal structures. Rare earth tantalate (RETaO 4 、RE 3 TaO 7 and RETa 3 o 9 ) has been continuously researched and applied due to its excellent thermo-mechanical properties (low thermal conductivity, high thermal expansion coefficient, high fracture toughness, low modulus, high temperature stability and corrosion resistance, etc.). However, the main raw material of rare earth tantalate is rare earth elements, and rare earth elements are protected as my country's strategic resources, so their mining volume is small, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/645
CPCC04B35/495C04B35/622C04B35/645C04B2235/3208C04B2235/3279C04B2235/3275C04B2235/3206C04B2235/3213C04B2235/3215C04B2235/3284C04B2235/77C04B2235/96C04B2235/9607C04B2235/785
Inventor 冯晶陈琳罗可人李柏辉王建坤张陆洋张鹤瀛
Owner KUNMING UNIV OF SCI & TECH
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