What are the preparation methods of zirconia ceramic powder?

Zirconium oxide ceramics have been widely used in wear resistance, bending resistance, heat insulation and high toughness. At present, there are many methods at home and abroad for the preparation of powders of zirconia ceramics, such as lime sintering. Alkaline melting method and plasma method, etc., we will introduce the preparation method of zirconia ceramic powder which is more common now.

    1. Sol-gel method. This method is a widely used method for preparing zirconia ceramic powder, which mainly utilizes a colloidal dispersion system to form a relatively stable sol, which is then subjected to dehydration, drying and calcination. This method has many advantages, the chemical composition is relatively uniform, the purity is also high, and the particle size distribution is relatively narrow, and can reach the molecular or atomic scale.

    2. Hydrothermal method. The method is capable of directly producing nano-sized zirconia particles in an autoclave by adding an appropriate chemical reagent and reacting at a high temperature and a high pressure to form a very stable zirconia solid solution.

    3. Hydrolysis precipitation method. This method is further broken down into two different methods, namely hydrolyzed precipitation of zirconium alkoxide and zirconium salt, respectively. Each method can be simply prepared into a desired substance, and the second method requires mainly filtration, washing, drying and calcination, etc. The advantage of this method is that the purity and the unity of the structure are relatively good, and the one-step can be formed. particle.

    4. Coprecipitation method. It is a precipitation method based on coprecipitation and chemical coprecipitation. There are also many steps in the preparation. It is based on lye as a precipitant, such as ammonia, potassium hydroxide, sodium hydroxide and urea. After a series of processing, such as drying, filtration and calcination, a relatively stable powder is produced.

    In the preparation method of zirconia ceramic powder, we have seen that the final steps of the hydrolysis precipitation method and the coprecipitation method are the same, and all of them are achieved by calcination, except that the previous treatment methods are different, in actual During the application process, you can choose the appropriate preparation method according to your needs.