Thermal conductive materials often used are thermally conductive gaskets (also known as thermally conductive silicone film, also known as thermally conductive silicone pad, heat dissipation silicone film), thermally conductive potting adhesive, thermally conductive silicone grease, etc. The following are a few questions that are often confused about thermally conductive materials to answer.

Q: Sometimes the thermal conductive adhesive, thermal conductive potting adhesive in the storage process will appear in the bottom of the precipitation, will affect the performance?

A: Thermal conductive materials can play a role in thermal conductivity mainly because of the addition of some metal oxide powder, these powders have good thermal conductivity, but because of its density, after a long time storage will be precipitated in the bottom. It is recommended that before using the thermal conductivity adhesive and thermal potting adhesive, it must be stirred evenly to ensure that the metal oxides are evenly distributed to achieve good thermal conductivity.

Q:Why some materials with high thermal conductivity do not have obvious thermal conductivity in actual use?

A: There are two important factors that determine the thermal conductivity of a material: thermal conductivity and thermal resistance.
Thermal conductivity refers to the heat transfer rate of a 1m thick material with a temperature difference of 1 degree (K) on both sides of the surface under stable heat transfer conditions, and the heat transferred through a square meter area in 1 second, the unit is "W/(m-degree), i.e. "W/(m - k) ", the size of which is determined by the properties of the material itself.

The thermal resistance is the temperature difference between the two ends of the object when the heat flow passes through the object, in K/W. The thermal resistance is related to the geometry of the corresponding material.

In actual use, the use environment determines the actual geometry of the material, which also determines the size of the thermal resistance of the material. If the thermal conductivity is high and the thermal resistance is also high, the thermal conductivity will be reduced. This situation is more influential in thermally conductive gaskets.

Q: Why do thermally conductive silicone grease fail during use?

A: The failure of thermal grease is mainly due to the high rate of oil separation. The so-called oil separation rate is the phenomenon that the silicone oil in the thermal grease volatilizes from the grease. The volatilization of silicone oil leads to uneven distribution of thermal grease and air gap in the middle, which causes the thermal effect of thermal grease to decrease suddenly and then fails.

Q: What are the operating precautions for various thermally conductive materials?

A: Thermally conductive gaskets: Thermally conductive gaskets should be cut into shapes that meet the working conditions, but the ratio of thickness to length and width should be noted.

Thermally conductive potting glue: The filler in thermally conductive potting glue will settle at the bottom, so it is necessary to mix the two components separately and evenly before double-component mixing in the process.

Thermally conductive silicone grease: To ensure uniform distribution, screen printing is generally used.

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