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A kind of preparation method of rectangular flaky monoclinic zirconia

A zirconium oxide and flake technology, applied in the field of new inorganic materials, can solve the problems of long period, small parallel dimension of layers, irregular shape and so on

Active Publication Date: 2020-04-28
JINGDEZHEN CERAMIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: the preparation process is complex and the cycle is long; sulfuric acid is required as an acidic reaction medium, which is costly, dangerous, and pollutes the environment; the obtained crystals have small parallel dimensions along the layer.
The deficiency of this method is: adopt sodium borohydride solution to prepare white precipitate, because sodium borohydride encounters water and can produce flammable gas, therefore there is certain danger; Preparation process is comparatively complicated and cycle is long; Gained sample yield is relatively low Low, the parallel dimension of the layer is small (<500 nm), and the shape is irregular

Method used

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  • A kind of preparation method of rectangular flaky monoclinic zirconia
  • A kind of preparation method of rectangular flaky monoclinic zirconia

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Effect test

Embodiment 1

[0020] Zirconium oxychloride is used as the reaction precursor, sodium chloride is used as the molten salt, and sodium fluoride is used as the molten salt additive. First, zirconium oxychloride was heat-treated at 100°C for 22 h to obtain a calcined product, and then weighed 2 g of the calcined product, 2 g of sodium chloride and 0.2 g of sodium fluoride, with a mass ratio of 10:10:1, Grind after mixing. The ground mixture was placed in a corundum crucible and heated in a resistance furnace. The temperature was raised to 400°C at 5°C / min and kept for 20 minutes, and then continued to rise to 800°C for 5 hours. After it was cooled to room temperature, the obtained calcined product was washed three times with deionized water, then washed once with absolute ethanol, and finally dried at 70 °C for 6 h to obtain rectangular flaky monoclinic zirconia.

Embodiment 2

[0022] Zirconium oxychloride is used as precursor, sodium chloride is used as molten salt, and sodium fluoride is used as molten salt additive. First, zirconium oxychloride was heat-treated at 110°C for 20 h to obtain a calcined product, and then weighed 2 g of the calcined product, 1 g of sodium chloride and 0.2 g of sodium fluoride, with a mass ratio of 10:5:1, Grind after mixing. The ground mixture was placed in a corundum crucible and heated in a resistance furnace. The temperature was raised to 450°C at 5°C / min and kept for 15 minutes, and then continued to rise to 850°C for 5 hours. After it was cooled to room temperature, the obtained calcined product was washed three times with deionized water, then washed once with absolute ethanol, and finally dried at 70 °C for 6 h to obtain rectangular flaky monoclinic zirconia.

Embodiment 3

[0024] Zirconium oxychloride is used as precursor, sodium chloride is used as molten salt, and sodium fluoride is used as molten salt additive. First, zirconium oxychloride was heat-treated at 120°C for 18 h to obtain a calcined product, and then weighed 2 g of the calcined product, 2 g of sodium chloride and 0.4 g of sodium fluoride, with a mass ratio of 10:10:2, Grind after mixing. The ground mixture was placed in a corundum crucible and heated in a resistance furnace. The temperature was raised to 500°C at a rate of 5°C / min and kept for 10 minutes, and then continued to rise to 900°C for 3 hours. After it was cooled to room temperature, the obtained calcined product was washed three times with deionized water, then washed once with absolute ethanol, and finally dried at 70 °C for 6 h to obtain rectangular flaky monoclinic zirconia.

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Abstract

The invention discloses a preparation method of rectangular sheet-type monoclinic zirconia for the first time. The preparation method comprises the steps of with zirconium oxychloride (ZrOCl2.8H2O) asa reaction precursor, carrying out low-temperature pre-sintering on the reaction precursor, mixing a pre-sintering product with fused salt and a fused salt additive in a certain mass ratio, grinding,and carrying out thermal treatment, washing and drying, so as to obtain rectangular sheet-type monoclinic zirconia. The method has the beneficial effects that the adopted reaction precursor is low incost, the fused salt is cheap and environmentally friendly, and an operation process is simple, convenient, easy in control and short in preparation period; and prepared rectangular sheet-type monoclinic zirconia has a regular shape and a pure phase and is high in yield, suitable for scale production and hopefully applied to the enhancement fields of photocatalysis, metal materials and organic polymer materials.

Description

technical field [0001] The invention belongs to the field of new inorganic materials, and in particular relates to a preparation method of rectangular sheet-shaped monoclinic zirconia which can be applied in the fields of photocatalysis and enhancement. Background technique [0002] Zirconia has a series of characteristics such as high strength and toughness, wear resistance, corrosion resistance, human affinity, high temperature ionic conductivity, and matching with the expansion coefficient of metal materials. It is used in ceramic knives, artificial teeth and bones, oxygen sensors, catalysts and Catalyst supports and other fields have a wide range of applications. In recent years, with the in-depth research on zirconia, more and more zirconia with different morphologies have been prepared and exhibit better physical and chemical properties than usual. Flaky monoclinic zirconia is expected to be used in the field of photocatalysis due to its special two-dimensional struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/02
CPCC01G25/02C01P2002/72C01P2004/03C01P2004/22
Inventor 江伟辉王涛刘健敏徐贵荣冯果陈婷苗立锋张权
Owner JINGDEZHEN CERAMIC UNIV
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