Extraction method of zirconia ceramic raw material---colloid method

The colloidal method is also a method of extracting zirconia ceramics. The general method is to mix the precursors in the synthetic powder in the sol, and let the zirconia ceramics separate from the sol. Its advantage can precisely control the powder of chemical composition, but its cost is high and the productivity is low. The following Kezhong Ceramics Factory will take you to understand it in detail.

The most common sol methods are sol-gel method and sol-precipitation method. Sol“gel technology plays an important role in the field of ceramics and drives the development of this field. As a material wet chemical preparation method, it can be used not only to prepare ceramic powders, but also to prepare thin films. This method is to convert the sol of metal oxide or hydroxide into gel, then dry the gel and bake it, and then obtain the oxide.

Zirconia ceramic plate

From sol to gel, the excessive growth of crystal grains is avoided, so that extremely small particles (several nanometers to tens of nanometers) can be obtained, and the particle size distribution range is narrow. However, agglomerated structures may still be formed during the gel drying and calcination stages. Most sol-gel processes use organic solvents as the medium.

Because organic solvents have surface tension and are not easy to form hydrogen bonds, the degree of agglomeration is not large. However, if water is used as a medium, it will cause serious reunion. The sol-gel process is a molecular-level controllable process, and the superfine powder with high purity and uniform composition can be obtained by using the sol-gel process. Moreover, if the material is controlled in a relatively small size range in the early stage of material formation, it is expected to improve the structure and performance of the ultrafine powder.

The sol precipitation method is another powder making method. In this method, an organic compound is added to the zirconium salt solution as a colloidal precipitant, so that the two co-precipitate in the alkali to form a gel composed of organic compounds and disperse the metal hydroxide composite. body, the resultant is roasted, the additives are removed, and Zr()2 powder is obtained.

By adding alcohol to the aqueous solution of zirconium salt, the dielectric constant of the medium is reduced, which leads to the coalescence of colloidal particles, the precipitation of spherical particles from the sol, and finally the spherical spherical particles of ZrO2. Yttrium-stabilized tetragonal and cubic ZrO2 can be synthesized by sol-gel method and sol-precipitation method with corresponding precursors.

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