Sol of Ceramic Powder

The sol gel method is a method that converts the sol with a concentration of metal oxides or hydroxides into a gel, then calcines the gel after drying, and then produces oxides. The following will further elaborate on the sol of ceramic powder by the Kezhong ceramic manufacturer.

The sol of ceramic powder first causes the fine particles to be suspended in the aqueous solution (sol), then drops the sol into a solvent that can be dehydrated to make the particles agglomerate into colloidal form (i.e. gel), and then removes the solvent or lets the solute precipitate down to become gel. The pH value of the solution, the concentration of ions or molecules in the solution, the reaction temperature and time are the four main parameters controlling the sol gel. The pH value and reaction temperature of the solution are the main control conditions for the preparation of simple oxide (such as SiO ₂) powders. The gel process of different component sols is different. The main parameters for controlling the gel process need to be obtained from the summary of experimental data.

This method was first used in the 1960s to manufacture ThO ₂, and the resulting ThO ₂ powder has good sintering properties and can be sintered at a temperature of 1150 ℃. The density of the obtained product is 99% of the theoretical density, indicating a relatively high degree of density. The sol gel method can be used not only to prepare micro powders, but also to prepare films, fibers, bulk materials and composites.

Its advantages and disadvantages are as follows:

① The preparation process of high-purity powder (especially multi-component powder) does not require mechanical mixing and is not easy to introduce impurities;

② Good chemical uniformity Because in the process of sol gel, the sol is made from solution, and in the gel process, the reactants are evenly mixed at the molecular level;

③ The particle size of fine rubber is less than 0 1μ M;

④ The method can accommodate insoluble components or insoluble particles of insoluble components uniformly dispersed in the solution containing components that do not produce precipitation. After gelling, insoluble components can be naturally fixed in the gel system. The finer the insoluble component particles, the better the chemical uniformity of the system;

⑤ The doping distribution is uniform, and the distribution of soluble trace doping components is uniform, without separation or segregation. It is superior to the hydrolysis of alcohol and saline solution;

⑥ Chemical reaction is easier than Dry media reaction, and the synthesis temperature is lower;

⑦ The process and equipment are simple, but the raw materials are expensive;

⑧ The sintered temperature of dried spherical gel particles is low, but the sintering property between gel particles is poor, that is, the sintering property of materials is poor;

⑨ Large shrinkage during drying;

⑩ The sol-gel process takes a long time, usually several days or weeks.

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