Thermal grease is a high thermal conductivity insulating silicone material, almost never cured, can be kept in the state of grease at a temperature of -50 to 230 for a long time, and will not be air-dried, hardened or melted under normal conditions
I believe that many people will have this idea, thinking that the higher the thermal conductivity of thermal grease, the better the thermal grease. Because thermal grease is a filler applied to heat transfer between the heating element and the heat sink, it is used to improve the thermal conductivity effect of the heating element. Therefore, for thermal grease, the higher the thermal conductivity, the better. However, many practical application cases prove that from the perspective of application, this is only a one-sided statement.
For example, use 15w/m.K's thermal grease, after half a month of use, there is a phenomenon of weakened heat dissipation effect, disassemble the heat sink and IC chip to check, found that the state of thermal grease and the state of use are completely different, a lot of drying, and there is no thermal grease attached to the IC.
Therefore, the higher the thermal conductivity of thermal grease, the better is only one of the advantages, but the factors to determine whether thermal grease is suitable for its own products should be considered in many aspects. Comprehensive evaluation of thermal conductivity, thermal resistance, oil separation rate, etc. When all factors meet the requirements of the product, it can be called a good thermal grease. If you blindly pursue high thermal conductivity and ignore other application properties, it will lead to the early scrapping of the product service life, affect the market competitiveness of the product, and may increase the cost to yourself.