Preparation method of cerium-stabilized zirconia-toughened alumina ceramic material

A technology for stabilizing zirconia and alumina ceramics, applied in the field of ceramic material preparation, can solve the problems of shortening the experiment time and time-consuming precipitation and washing, and achieve the effect of shortening the experiment time, shortening the preparation cycle and ensuring the uniformity

Active Publication Date: 2019-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention utilizes an improved electro-adsorption device to effectively remove residual Cl in the supernatant and bottom precipitation during the preparation of the precursor — , NH 4 + , NO 3 — , OH — and other redundant salt impurity ions overcome the disadvantages of long time-consuming precipitation and water washing and low efficiency in the prior art, greatly shorten the experimental time, improve the efficiency of powder making, and effectively ensure the uniformity and purity of powder components. And the density of the ceramic material structure obtained after powder sintering

Method used

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  • Preparation method of cerium-stabilized zirconia-toughened alumina ceramic material
  • Preparation method of cerium-stabilized zirconia-toughened alumina ceramic material
  • Preparation method of cerium-stabilized zirconia-toughened alumina ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Use zirconium oxychloride octahydrate and cerium nitrate hexahydrate as raw materials to prepare a solution by adding deionized water respectively, and mix and stir for 1 hour to obtain a mixed solution. Ce in the mixed solution 3+ and Zr 4+ The molar ratio of the solution is 4:96, and the concentration of 0.1mol / L ammonia water is added dropwise.

[0039] (2) After flocculent precipitation occurs in the solution, add polyethylene glycol with a quality of 3% of the total mass of zirconium oxychloride octahydrate and cerium nitrate hexahydrate, and continue stirring until the pH of the solution is adjusted to 9.5-10.5. Precipitation is complete.

[0040] (3) The improved electric adsorption device is fixed on the top of the container containing the precipitation mixed solution, the motor switch 7 is turned on, and the negative electrode plate 5 and the positive electrode plate 6 fixed on the bottom of the turntable 2 rotate with the turntable 2 to stir the precipita...

Embodiment 2

[0049] (1) Use zirconium oxychloride octahydrate and cerium nitrate hexahydrate as raw materials to prepare a solution by adding deionized water respectively, and mix and stir for 1 hour to obtain a mixed solution. Ce in the mixed solution 3+ and Zr 4+ The molar ratio of the solution is 14:86, and the concentration of 0.1mol / L ammonia water is added dropwise.

[0050] (2) After flocculent precipitation occurs in the solution, add ammonium polyacrylate with a quality of 3% of the total mass of zirconium oxychloride octahydrate and cerium nitrate hexahydrate raw material, continue stirring until the pH of the solution is adjusted to 9.5-10.5, and the solution precipitates completely.

[0051] (3) The improved electric adsorption device is fixed on the top of the container containing the precipitation mixed solution, the motor switch 7 is turned on, and the negative electrode plate 5 and the positive electrode plate 6 fixed on the bottom of the turntable 2 rotate with the turnta...

Embodiment 3

[0060] (1) Use zirconium oxychloride octahydrate and cerium nitrate hexahydrate as raw materials to prepare a solution by adding deionized water respectively, and mix and stir for 1 hour to obtain a mixed solution. Ce in the mixed solution 3+ and Zr 4+ The molar ratio of the solution is 8:92, and the concentration of 0.1mol / L ammonia water is added dropwise.

[0061] (2) After flocculent precipitation occurs in the solution, add ammonium polyacrylate with a quality of 3% of the total mass of zirconium oxychloride octahydrate and cerium nitrate hexahydrate raw material, continue stirring until the pH of the solution is adjusted to 9.5-10.5, and the solution precipitates completely.

[0062] (3) The improved electric adsorption device is fixed on the top of the container containing the precipitation mixed solution, the motor switch 7 is turned on, and the negative electrode plate 5 and the positive electrode plate 6 fixed on the bottom of the turntable 2 rotate with the turntab...

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Abstract

The invention discloses a preparation method of a cerium-stabilized zirconia-toughened alumina ceramic material. The preparation method comprises adding water to zirconium oxychloride octahydrate andcerium nitrate hexahydrate to prepare solutions, mixing the solutions evenly to form a mixed solution, and dropwise adding ammonia water; after flocculent precipitate occurs, adding a surfactant; fixing a modified electric adsorbing device above a precipitate mixed solution container, and removing surplus Cl-, NH4+, OH- and NO3- in the solution by stirring and adsorbing through the electric adsorbing device; sucking all supernate, and dewatering the rest precipitate to obtain a precursor; adding absolute ethyl alcohol into the precursor, stirring well, adding nano alumina powder, carrying outball milling, drying, grinding, screening, and calcining to obtain zirconia-toughened alumina ceramic powder; after shaping, sintering to obtain the cerium-stabilized zirconia-toughened alumina ceramic material. The preparation method has shorter preparation cycle of powder, the powder can have less chances for hard aggregation due to 'salt bridge', and component uniformity and purity are guaranteed for the powder.

Description

technical field [0001] The invention relates to a preparation of a ceramic material, in particular to a preparation method of a cerium-stabilized zirconia toughened alumina ceramic material. Background technique [0002] The co-precipitation method is to add a precipitant (can be added or generated internally) to a mixed metal salt solution (that is, two or more metal salts) to obtain a mixed precipitate with a uniform chemical composition. After repeated washing, drying, and calcination (heating) decomposition) to obtain composite oxides. Compared with the solid-state reaction method, the co-precipitation method can produce powders with good chemical uniformity and easy sintering, because of its simple and practical process, low production cost, high purity, ultrafine, uniform composition, and high sintering performance. Good raw material powders have been widely used in the preparation of various oxide ceramic powders. However, it is difficult to avoid the occurrence of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/626C04B35/622
Inventor 王丽媛饶平根
Owner SOUTH CHINA UNIV OF TECH
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