Due to its larger specific surface area and uniform distribution compared with other morphologies, spherical alumina powder has better application performance in practical use than alumina materials of other shapes. It can be widely used in various fields such as ceramics, catalysts and their carriers, grinding and polishing, as well as electronic and optical materials.

1. Field of Thermal Conductive Fillers

The miniaturization of electronic devices leads to a significant increase in heat generation, raising higher requirements for system heat dissipation. Alumina has become the mainstream filler for high thermal conductive and insulating materials, thanks to its wide distribution, diverse types, low price, high filling capacity in polymer materials, and excellent cost-effectiveness.
  • Spherical alumina features good morphology, high thermal conductivity, and simple preparation process, making it more scalable than fibrous alumina (which is difficult for industrialization).
  • It is used as a thermal interface material to address thermal runaway issues in systems such as batteries, electronic controls, and motors of new energy vehicles.
  • According to data from QYResearch, the proportion of spherical alumina in downstream applications is as follows: 48% for thermal interface materials, 17% for thermal conductive engineering plastics, and 14% for high thermal conductive aluminum-based copper-clad laminates.

2. Ceramic Field

Adding a certain amount of spherical alumina powder can greatly improve the performance of ceramics: it solves the problem of low-temperature brittleness of ceramics, enabling the production of low-temperature resistant plastic ceramics; when the content of spherical alumina powder is 5.0%, it can effectively enhance the toughness of ceramics and reduce the sintering temperature.

3. Grinding and Polishing Field

Compared with traditional granular or flaky alumina, spherical alumina has better dispersibility and fluidity. Spherical alumina powder abrasives can be evenly distributed on the product to be polished without abnormal powder accumulation. Moreover, their smooth particle surface avoids scratching the workpiece surface, thereby improving the smoothness of the polished surface.

4. Electronic and Optical Materials Field

Spherical alumina has wide applications in electronic and optical fields. It can be used as a substrate, and adding rare earth elements as activators can produce red luminescent materials with better performance. With uniform particle size and dispersion, spherical alumina has better luminescent performance than alumina of other shapes and can better determine the filling structure of luminescent materials.
  • Reducing the particle size of spherical alumina can decrease the light transmittance of the powder, which is beneficial for increasing bulk density, reducing transmitted light loss and light scattering of spherical alumina as a luminescent material, thus improving the brightness of electronic device screens.

5. Catalyst and Its Carrier Field

Alumina has a large number of unsaturated chemical bonds on its surface, providing numerous catalytic active sites and thus exhibiting high chemical activity.
  • Additionally, spherical alumina has the advantages of low particle wear, long service life, and large specific surface area, making the performance of catalysts and catalyst carriers made from it irreplaceable by other materials.

6. 3D Printing Field

With its high strength, high sphericity, and high temperature resistance, spherical alumina is one of the most commonly used materials for 3D printing.
  • Its powder has good fluidity, high chemical reaction rate, and excellent stacking property. Therefore, when used as printing slurry, it has the advantages of high solid content, good fluidity, easy cleaning, and excellent mechanical properties.

7. Surface Protective Coating Field

Using spherical alumina as a coating material is one of the current research hotspots. Coating materials not only provide protection for polymer materials, glass, metals, and alloys but also extend the service life of stainless steel products such as kitchen cookware.
  • Spherical alumina is often used as a protective material due to its high hardness, corrosion resistance, high temperature resistance, regular morphology, uniform size, and good dispersion. It not only improves the performance of materials but also makes them smooth and wear-resistant. Meanwhile, as a coating material, spherical alumina has different applications in different environments, with a simple application process and protection for the surfaces of various materials.