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Spherical alumina

Spherical alumina is made of irregular alumina raw material which is molten and sprayed into liquid droplets at high temperature, then becomes spherical under the action of surface tension and solidified by rapid cooling. Later, it can obtain the alumina powder material by sieving and purification process.The product has the properties of high thermal conductivity, high insulation, high hardness, high temperature resistance, corrosion resistance, wear resistance, etc. It has unique and excellent characteristics such as good fluidity, low oil absorption value, high sphericity, high alpha phase content, small specific surface area, and controllable particle size distribution. It is widely used as filler for thermally conductive interface materials, thermally conductive engineering plastics and aluminum-based copper-clad plates.


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Product nature

  • High purity

    The raw material is chemically treated to remove silicon, iron, titanium and other oxides to obtain the product, and the purity of the powder is as high as 99.7%.

  • Good thermal conductivity

    Its appearance is spherical, which enables multi-directional of heat transfer, good dispersion in the system, and high thermal conductivity of thermally conductive products. Its can be filled with high density, and compared with crystalline silicon powder, it can obtain a mixture with high thermal conductivity and good heat dissipation.

  • High filling rate
    With its high particle sphericity and wide particle size distribution, it can fill silica gel, epoxy, rubber and plastic with high density, and can obtain mixtures with low viscosity and good fluidity.

  • Low abrasiveness
    Because of its spherical appearance, the wear on equipment such as kneaders, molding machines and molds is greatly reduced and the service life of equipment can be extended.

  • Narrow particle size distribution
    The distribution of particles of a single particle size is concentrated, and the interval frequency distribution curve on the particle size analysis report is a very narrow single peak pattern.

Scope of application

1.Thermally conductive materials: Thermally conductive materials are the most important application of spherical alumina. Spherical alumina as thermally conductive materials are divided into thermal interface materials, thermally conductive engineering plastics, thermally conductive aluminum-based copper-clad plates, thermally conductive plastic sealing materials, etc.

2.Catalyst: Spherical alumina is widely used as a base material for catalysts in petroleum processing, chemical and metallurgical industries, for example, it is commonly used to catalyze reactions of heavy oil, wax oil, desulfurization, etc.

3.Adsorbent: Spherical alumina can be used as adsorbent for the separation, purification and purification of gases and liquids, commonly used in dehydration, desulfurization, deoxygenation, denitration and other environmental protection fields.

4.Filler: Spherical alumina can be used as a high strength and high hardness filler material for filling electronic products, plastics, rubber, ceramics and other materials, which can improve the hardness, strength and durability of products. Filler for heat sink, heat sink substrate (MC substrate), heat sink grease, phase change sheet, filler for semiconductor encapsulation resin, filler for silicone heat sink binder and mixture;

5.Polishing material: Spherical alumina can be used as polishing material for polishing and buffing of metal surfaces, which can obtain polished, smooth and reflective surfaces.

6.Reaction auxiliaries: spherical alumina can also be used as reaction auxiliaries for some high temperature reactions, solid oxidation reactions, reduction reactions, etc., which can increase the reaction speed and improve the reaction efficiency.

7.Ceramic materials: Ceramic materials added with spherical alumina powder can be used to manufacture low temperature resistant plastic ceramics. In addition, spherical alumina can greatly improve the toughness of ceramics, and when the content of spherical alumina powder is 5.0%, it can effectively improve the toughness of ceramics and reduce the sintering temperature.

8.3D printing material: spherical alumina is the most commonly used material for 3D printing because of its high strength, high sphericity and high temperature resistance. Since spherical alumina powder has good particle fluidity, chemical reaction rate and stacking, it has the advantages of high solid content, good fluidity, easy cleaning and high mechanical properties when used as printing slurry.

9.Thermal spray coating: Spherical alumina powder particles are sprayed on metals and plastics to improve the hardness, corrosion resistance, wear resistance and fire resistance of the surface, which can be used for surface protection of machinery and chemical pipelines, etc.

10.Nanoscale spherical alumina powder is sensitive to humidity, has high application value in temperature sensor, and is used as substrate material for large-scale integrated circuits.

11.Nanoscale spherical alumina powder has strong absorption ability for UV light below 250nm. If several nanometers of spherical alumina powder are doped into rare earth phosphor, the nano UV absorption blue shift phenomenon can be used to absorb the harmful UV light, and it will not reduce the luminous efficiency of the phosphor. Nano spherical alumina can be sintered into transparent ceramics as the material of high-pressure sodium lamp can be compounded with rare-earth phosphor as the light-emitting material of the mouth light lamp.

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