Since the amount of thermally conductive powder added to high thermally conductive interface materials is relatively large, achieving high thermal conductivity depends on the selection of high-quality thermally conductive powder. High-purity magnesium oxide is a very good filler! Research shows that the addition of high-purity magnesium oxide can significantly improve the performance of thermally conductive interface materials.
As we all know, thermal conductivity refers to the ability of a substance to transfer heat energy. In solids, heat transfer is mainly through phonon transfer. Therefore, the thermal conductivity of solid materials is closely related to the lattice structure and phonon properties. The lattice structure of magnesium oxide is rock salt type, with each magnesium ion surrounded by 8 cations, and each oxygen ion surrounded by 4 magnesium ions. This structure determines that magnesium oxide has good thermal conductivity. At room temperature, magnesium oxide has a purity of more than 99% and has extremely high thermal conductivity and can quickly transfer heat. Therefore, it is widely used in equipment such as high-temperature furnaces, hot spot generators, and heat pipes. In addition, it is also used as an insulating material for electronic components and High temperature ceramic materials.
In addition to high thermal conductivity, the thermally conductive potting compound must also have good flame retardancy. And it has better fluidity after being fully mixed with silicone oil. At the same time, the specific gravity of magnesium oxide is moderate, which can prevent the slurry from settling and hardening due to long-term placement.
In the production of high thermal conductivity materials, the selection of magnesium oxide powder is crucial, but the impact of powder particle size on the thermal conductivity cannot be ignored. According to the required addition amount of different thermal conductive materials, the particle size also needs to be selected separately. Generally speaking, there are certain requirements for the large particle size added to thermally conductive powder. For example, when added to thermally conductive pads and thermally conductive potting fillers, large particle sizes are more likely to contact each other, thereby forming thermal conductive paths and increasing thermal conductivity. But the finished product is not that delicate. Choosing a small particle size powder will have a larger surface area in contact with the substrate, and the heat transfer resistance will be greater, and the thermal conductivity will be slightly lower.
Therefore, it is necessary to comprehensively consider the advantages of different particle sizes under different filling amounts. Through reasonable particle size matching, the powder can form more thermal conductive networks in the polymer material and obtain materials with different thermal conductivities. The high-purity magnesium oxide independently developed and produced by Messi Biology can provide parameter index customization services to meet the above needs of thermal conductive materials and is a more efficient and reliable choice.