White corundum powder for epoxy insulating board
White corundum powder is a kind of anti-skid, wear-resistance material. It can improve the thermal conductivity, wear-resistance, and dielectric properties of epoxy resin insulating boards.
The advantage of white corundum powder for the insulating board:
With the development of the electronic industry, epoxy composite insulation material based on the epoxy resin is popular. Because it has superior electrical stability, heat resistance, and moisture resistance. In order to ensure the normal operation of electronic components, electronic insulating devices have to get high heat dissipation performance. However, the thermal conductivity of traditional epoxy resin is not high (0.2W / (m.k)). Thus it can not meet the requirements of good thermal conductivity and heat dissipation.
Adding inorganic materials is one of the effective ways to improve the thermal conductivity of resin polymers. Among them, the price of fused alumina powder is moderate and the source is wide. At the same time, it has good thermal conductivity and electrical insulation and has become a common material added to insulating composites. Fused white corundum has a good heat resistance and thermal conductivity. The fire resistance temperature can reach 1850 ℃, the thermal conductivity at 293 ℃ is 3.34 w / (m.k), and the thermal conductivity at 473 ℃ is 4.46 w / (m.k).
Experiments show that when adding 3.5 micro fused white corundum powder to fill epoxy resin, the thermal conductivity of epoxy resin will increase with the increase of alumina filler. At this time, the filling ratio should be less than 37.5%. When D50 is 10 microns fused white corundum powder, the filling ratio can be increased to 80% and the thermal conductivity can be increased to 4.5 w / (m.k). The purpose of improving the thermal conductivity of insulating plates and other materials is achieved.
In addition, the fused white corundum powder has superior physical properties, high mechanical strength, high hardness, and good toughness. It plays a role in wear resistance and toughening of epoxy resin insulating materials.
