Alumina ceramics have superior high-temperature strength, stable chemical properties, and good wear resistance, and can withstand harsh working environments that are difficult for metal materials and polymer materials. They have become one of the preferred materials for advanced structures; alumina ceramics are cheap The source of raw materials makes it the advanced ceramic material with the largest production volume and the widest application range. Now, alumina ceramics are widely used in the fields of electronic power, automobile industry, chemical industry, cutting tools and aerospace. The application performance of alumina products in many fields has a great relationship with the shape and size of raw material powder particles. Among powder particles of different shapes, spherical particles have regular shapes, smaller specific surface area, and larger The bulk density and good fluidity can greatly improve the application performance of the product, such as:
1) Spherical powder has good compression molding and sintering characteristics, which is extremely beneficial for the production of high-quality ceramic products;
2) As a grinding and polishing material, spherical alumina can avoid scratches;
3) In the petrochemical industry, spherical alumina powder can regulate the pore size and distribution of catalyst carrier particles by adjusting the particle size configuration;
4) The spherical alumina used directly as a catalyst can reduce wear and improve the service life of the catalyst, thereby reducing production costs.
Therefore, the preparation of spherical alumina has become one of the hot issues in material research.
