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By Lzh | 08 February 2023 | 0 Comments

Why spherical alumina has high thermal conductivity?

What is spherical alumina?
Spherical alumina, AL2O3 powder, due to its high melting point, good thermal stability, high hardness, good performance, high mechanical strength, good electrical insulation, and strong performance, is used in the electronic and electrical industry, as a filler for rubber and resin, it can improve the thermal conductivity of the mixture, reduce the coefficient of expansion and increase the strength of the mixture; The spherical shape is conducive to the dispersion and sliding of the powder in the system, which can be uniformly dispersed in the organic body and form a close accumulation to obtain a mixture with high filling, low viscosity, and high thermal conductivity; At the same time, the wear of mixer, molding machine, mold, and other equipment is greatly reduced, which can prolong the service life of the equipment.
Characteristics of spherical alumina
High thermal conductivity: spherical alumina can be filled with high density. Compared with crystalline silicon powder, a mixture with high thermal conductivity and good heat dissipation can be obtained. Currently, on the market, the thermally conductive silicone grease (paste) or thermal conductive film uses a large amount of aluminum oxide and zinc oxide fillers at 0.8W-1.5W. Using spherical alumina can develop products with thermal conductivity above 2.0 w/mk.
Preparation of spherical alumina
Polymer network sol-gel method: the advantage is that the aluminum oxide powder produced is small in size. The disadvantage is that the sphericity is very poor.
Alcoholic solution: The advantage is that the particle size of the powder is small. The disadvantage is that the cost is too high and the sphericity is poor.
Template method: The template method uses spherical raw materials as the reagent to control the shape in the process, and the product is usually a hollow or core-shell structure. The main process is to use polystyrene microspheres as the template, use carbonic acid functionalized alumina nanoparticles to coat, and then wash with toluene to prepare hollow alumina spheres. The advantage is a good way to prepare hollow spheres. The disadvantage is that the template is required high, the preparation process is multi-step, and it is not easy to operate.
Price of spherical alumina
Spherical alumina particle size and purity will affect the product's price, and the purchase volume can also affect the cost of spherical alumina. A large amount of large amount will be lower. The price of spherical alumina can be found on our company's official website.
Spherical alumina supplier
Luoyang Tongrun Nano Technology Co. Ltd.  (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including spherical alumina, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective spherical alumina, you are welcome to contact us or inquire at any time.

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