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AB2O6 type niobate ceramic and preparation method thereof

A technology of AB2O6 and niobate, which is applied in the field of AB2O6 niobate ceramics and its preparation, can solve the problems of high cost of rare earth tantalate and rare earth niobate, achieve faster densification, improve thermodynamic properties, and reduce sintering Effect of desired temperature

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

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Problems solved by technology

[0006] The present invention intends to provide a kind of AB 2 o 6 Type niobate ceramics and preparation method thereof, to solve the problem of high cost of rare earth tantalate and rare earth niobate in existing thermal barrier / environmental barrier coatings

Method used

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  • AB2O6 type niobate ceramic and preparation method thereof
  • AB2O6 type niobate ceramic and preparation method thereof
  • AB2O6 type niobate ceramic and preparation method thereof

Examples

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Embodiment 1

[0042] A kind of AB 2 o 6 type niobate ceramics, the structure of which is CaNb 2 o 6 , its preparation method comprises the following steps:

[0043] step one,

[0044] CaCO 3 and niobium oxalate respectively at 950-1000°C for 1-1.5h to complete thermal decomposition and form highly reactive CaO and Nb 2 o 5 powder. In this embodiment, the preferred holding temperature is 1000°C, and the holding time is preferably 1h

[0045] step two,

[0046] CaO, Nb 2 o 5 The alcohol with a concentration greater than 99.9% is put into a high-energy ball mill for grinding, the weight ratio of powder to alcohol is 1:5-20, the rotational speed during grinding is 2200-2500rpm, and the grinding time is 15-20h. After the grinding is completed, the powder is taken out and kept at a temperature of 50-75° C. for 8-10 hours to form a nano-sized highly reactive powder mixture. In this embodiment, the weight ratio of powder to alcohol is preferably 1:10, the rotational speed during grindin...

Embodiment 2

[0049] The difference between Example 2-Example 7 and Example 1 is that the elements at A are different, and Example 2 is NiNb 2 o 6 Ceramics, embodiment 3 are CoNb 2 o 6 Ceramic, embodiment 4 are MgNb 2 o 6 Ceramics, embodiment 5 are SrNb 2 o 6 Ceramics, embodiment 6 are BaNb 2 o 6 Ceramics, embodiment 7 are ZnNb 2 o 6 ceramics.

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Abstract

The invention belongs to the technical field of thermal barrier and environmental barrier coating materials, and discloses AB2O6 type niobate ceramic and a preparation method thereof. The structural formula of the ceramic is AB2O6, wherein A is one or more of Ni, Co, Mg, Ca, Sr, Ba or Zn, and B is Nb; the ceramic is of a single-phase structure. The preparation method comprises the following steps: carrying out thermal insulation and thermal decomposition on A(OH)2, ACO3 and niobium oxalate to obtain AO and Nb2O5 powder with high reaction activity; grinding and mixing the AO powder and the Nb2O5 powder to obtain a nano-sized powder mixture with high reaction activity; and finally, sintering the powder mixture with high reaction activity in a spark plasma sintering mode to obtain the blocky AB2O6 type niobate ceramic. The invention solves the problem of high cost of the existing thermal barrier / environmental barrier coating rare earth tantalate and rare earth niobate.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier and environmental barrier coating materials, in particular to an AB 2 o 6 Type niobate ceramics and preparation method thereof. Background technique [0002] In recent years, aero-engines have gradually developed towards high thrust-to-weight ratio, high flow ratio and high air inlet temperature, which makes the working temperature and pressure that the high-temperature parts of the combustion chamber and single crystal blades need to withstand continue to increase; at the same time, In order to improve energy utilization efficiency, it is urgent to improve the power generation efficiency of gas turbines used in large power generating units, and increasing the working temperature is the most direct and effective method. In order to withstand the operating temperature of the aero-engine, it is necessary to prepare materials for the aero-engine to have a higher service temperature. In ord...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3208C04B2235/3206C04B2235/3213C04B2235/3275C04B2235/3284C04B2235/77C04B2235/9607
Inventor 李柏辉冯晶陈琳罗可人张鹤瀛
Owner KUNMING UNIV OF SCI & TECH