Scandium oxide-stabilizing zirconia powder and preparation method thereof

Abstract

The invention relates to a scandium oxide-stabilizing zirconia powder and a preparation method thereof. The scandium oxide-stabilizing zirconia powder comprises zirconium oxychloride as precursor mother salt, one or more third elements of aluminum oxide, cerium oxide and bismuth oxide and a doping system, wherein the doping quantity of the scandium oxide is 8 mol%, and the total doping quantity of the aluminum oxide, the cerium oxide and the bismuth oxide is 0-7 wt%. The preparation method comprises the steps of water washing, filtration, drying, calcinations and powder surface dry and wet modification as well as constant-pressure hydrolysis reaction and low-pressure hydro-thermal reaction, wherein the constant-pressure hydrolysis reaction and low-pressure hydro-thermal reaction are carried out by the steps of: firstly carrying out constant-pressure hydrolysis on a water solution of the precursor mother salt ZrOCl2 (ScCl3) in a reactor, and then carrying out hydro-thermal treatment on hydrolysis liquid at the temperature less than 150 DEG C and the pressure of 0.3-0.5 MPa. The scandium oxide-stabilizing zirconia powder has the characteristics of small grain size, centralized size distribution, high sintering activity, lower specific surface area, suitability for the traditional casting process of a SOFC (Solid Oxide Fuel Cell) and high conductivity and strength index, and the preparation method has the advantages of simple and safe production process, lower cost, low requirement for equipment and easy realization of industrial big production.

Description

technical field [0001] The invention relates to scandium oxide stabilized zirconia powder and a preparation method thereof. Background technique [0002] Scandia Stabilized Zirconia (ScSZ) powder has the characteristics of small particle size, concentrated particle size distribution, high sintering activity and low specific surface area, and can be widely used in SOFC (SolidOxide Full Cells, solid oxide fuel cells ) The current tape casting method of the electrolyte substrate. [0003] In the environment of energy shortage, as a new type of high-efficiency green clean energy, SOFC has a broad market and application prospects. Therefore, the research of SOFC has attracted widespread attention from all over the world. Developed countries such as Europe, America and Japan have realized the commercialization of low-power laboratories, and are currently concentrating their efforts to accelerate commercialization, and various venture capital companies are also investing one after...

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Problems solved by technology

[0006] In summary, the existing methods of preparing materials, such as sol-gel method and acid-nitrate method, are difficult to form industrial production, and the powder prepared by coprecipitation method has defects such as hard agglomeration and uneven doping, and The ScSZ powders prepared by the above methods all have the disadvantages of high firing temperature and long holding time

So far, the ScSZ electrolyte material has neither solved the compatibility problem of conductivity and strength index, nor found a low-cost process and method suitable for industrial production, thus delaying the commercial application of SOFC

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