The Main Force Of Thermal Filler - Alumina

Thermal filler is a filler added to the matrix material to increase the thermal conductivity of the material. More commonly used thermal conductivity fillers are aluminum oxide, magnesium oxide, zinc oxide, aluminum nitride, boron nitride, silicon carbide, etc., among them, the use of more widely for micron alumina and silicon powder. In practice, nano-alumina and nitride are mostly used as filling powders in the field of high thermal conductivity. And zinc oxide is mostly used as thermal paste (thermal silicone grease) filler; Fiber high thermal conductivity toner, flake high thermal conductivity toner and so on are used in aerospace, LED, precision electronic instruments and other special fields. And today we will focus on the main army of thermal filler - alumina.

Alumina has the advantages of thermal conductivity and insulation, and can be used as a thermal filler for the preparation of thermal insulation glue, potting glue and other polymer materials. Compared with other fillers, although the thermal conductivity of alumina is not high, it can also basically meet the application of "thermal conductive interface materials, thermal conductive engineering plastics and aluminum matrix copper clad plate filler". And the low price of alumina, the source of a wide range of high thermal conductivity insulation polymer is economical and applicable filler.

Thermal conductive alumina is a white powder crystal generated under high temperature conditions, and its crystalline powder is numerous. The alumina used for thermal conduction has spherical alumina, spherical alumina, compound alumina, etc. The thermal conductive alumina must have the characteristics of narrow particle size distribution, good particle size stability, high thermal conductivity K value, and high filling fraction after coupling modification. In general, if the average particle size of thermally conductive alumina can be controlled within a reasonable range, the thermal conductivity can reach between 3-10W/(m*K) depending on the filling amount.

Thermal conductive alumina can be widely used in silica gel, potting glue, epoxy resin, plastic, rubber thermal conductive plastic, silicone grease, heat dissipation ceramic and other different materials. "In practice, Al2O3 powder fillers can be used alone or mixed with other fillers such as AIN, BN, etc."