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Nanocrystalline A4B2O9 type niobate ceramic prepared through ultralow-temperature sintering, and preparation method thereof

An A4B2O9 and niobate technology is applied in the field of ultra-low temperature sintering to prepare nanocrystalline A4B2O9 type niobate ceramics, which can solve the problems of high cost, high prices of tantalate and rare earth elements, reduce thermal conductivity, shorten sintering time, Avoid high porosity effects

Pending Publication Date: 2021-06-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention intends to provide a kind of ultra-low temperature sintering to prepare nanocrystalline A4B2O9 type niobate ceramics and its method, to solve the problem that the existing thermal barrier coating materials usually use rare earth The prices of tantalate, tantalate for preparation and rare earth elements are all high, which leads to the problem of high cost of existing thermal barrier coating materials

Method used

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  • Nanocrystalline A4B2O9 type niobate ceramic prepared through ultralow-temperature sintering, and preparation method thereof
  • Nanocrystalline A4B2O9 type niobate ceramic prepared through ultralow-temperature sintering, and preparation method thereof
  • Nanocrystalline A4B2O9 type niobate ceramic prepared through ultralow-temperature sintering, and preparation method thereof

Examples

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Embodiment 1

[0042] A nanocrystalline A4B2O9 type niobate ceramic prepared by ultra-low temperature sintering, the structural formula of the ceramic is Co 4 Nb 2 o 9 . Its preparation method comprises the following steps:

[0043] step one,

[0044] CoCO 3 , niobium oxalate respectively at 450-950°C for 1-1.5h, and through thermal decomposition, highly reactive CoO and Nb are obtained 2 o 5 . In this embodiment, the heat preservation temperature is preferably 720° C., and the heat preservation time is preferably 1 h.

[0045] step two,

[0046] CoO, Nb 2 o 5 The powder and alcohol with a purity of 99.99% are put into a high-energy ball mill for grinding, the weight ratio of powder and alcohol is 1:6-10, the speed of grinding is 2200-3500rpm, and the grinding time is 11-24h. After grinding, the powder is taken out, kept at 65-80°C for 6-10 hours, and dried to form a highly reactive powder mixture with nanometer size. In this example, the weight ratio of powder to alcohol is 1:8,...

Embodiment 2

[0050] The difference between embodiment 2 and embodiment 1 is that the structural formula of A4B2O9 type niobate ceramics in this embodiment is Ni 4 Nb 2 o 9 , its preparation method is consistent with Example 1.

Embodiment 3

[0052] The difference between embodiment 3 and embodiment 1 is that the structural formula of the A4B2O9 type niobate ceramics in this embodiment is Mg 4 Nb 2 o 9 , its preparation method is consistent with Example 1.

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Abstract

The invention belongs to the technical field of inorganic nonmetal thermal barrier coating materials, and discloses a nanocrystalline A4B2O9 type niobate ceramic prepared through ultralow-temperature sintering, and a preparation method thereof. The structural formula of the ceramic is A4B2O9, A is one or more of Ni, Co, Mg, Ca, Sr, Ba or Zn, B is Nb1-XTaX, and X is larger than or equal to 0.5 and larger than or equal to 0. The preparation method comprises the following steps: respectively carrying out thermal insulation and thermal decomposition on A(OH)2, ACO3, niobium oxalate and tantalum oxalate to obtain AO powder, Nb2O5 powder and Ta2O5 powder; then grinding to obtain a nano-sized powder mixture with high reaction activity; and finally, sintering the mixture powder to obtain the blocky A4B2O9 type niobate ceramic. The preparation method solves the problem that the cost of preparing the thermal barrier coating material is high due to the fact that the raw materials tantalate and rare earth elements used by the existing rare earth tantalate thermal barrier coating material are high in price.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic thermal barrier coating materials, and in particular relates to a method for preparing nanocrystalline A4B2O9 niobate ceramics by ultra-low temperature sintering. Background technique [0002] In recent years, with the rapid development of thermal barrier coatings and environmental barrier coating materials, oxide ceramics with different crystal structures have been continuously developed and applied. Rare earth tantalate (RETaO 4 、RE 3 TaO 7 and RETa 3 o 9 ), because of its excellent thermo-mechanical properties (low thermal conductivity, high thermal expansion coefficient, high fracture toughness, low modulus, high temperature stability and corrosion resistance, etc.), it has been continuously researched and applied. However, the main raw materials of rare earth tantalate are tantalate and rare earth elements. The price of tantalate is relatively high, and rare earth elements...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B35/64
CPCC04B35/495C04B35/622C04B35/64C04B2235/3275C04B2235/3215C04B2235/3206C04B2235/3251C04B2235/3279C04B2235/6567C04B2235/785C04B2235/96C04B2235/9607Y02E40/60
Inventor 陈琳冯晶李柏辉罗可人张陆洋王建坤
Owner KUNMING UNIV OF SCI & TECH
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