The material classification of thermal conductive silica gel sheet is introduced as well as the production process and heat transfer principle

What is the thermal conductive silica gel sheet made of

Using silica gel as the base material, adding certain metal oxides and various thermal conductive auxiliary materials, and then through the special process to synthesize thermal conductive silica gel sheet. Thermal conductive silica gel sheet is a polymer compound thermal conductive material with organic silicone resin as bonding base material and thermal conductive powder as filling

Second, the common substrate and auxiliary material made of silica gel sheet

Silicone resin (base material)

1 insulation thermal conductivity powder: magnesium oxide, alumina, boron nitride, beryllium oxide, aluminum nitride, quartz and other organosilicon plasticizer

2 flame retardant: magnesium hydroxide, aluminum hydroxide

3. Inorganic colorant (used to fill the product with a specific color)

4. Crosslinking agent (make the product slightly sticky)

5. Catalyst (process forming requirements)

Note: Heat-conducting silica gel sheet plays the role of heat conduction, forming a good heat-conducting pathway between the heating body and the heat dissipation device and filling the gap

Fillers include the following metal and inorganic fillers:

1. Metal powder packing: copper powder. Aluminum powder. Iron powder. Tin powder. Nickel powder;

2. Metal oxide: alumina. Bismuth oxide beryllium oxide. Magnesium oxide. Zinc oxide;

3. Metal nitride: aluminum nitride. Boron nitride. Silicon nitride;

4. Inorganic non-metal: graphite. Silicon carbide. Carbon fiber. Carbon nanotubes. Graphene. 1. By what is the thermal conductive silica gel sheet made of

Using silica gel as the base material, adding certain metal oxides and various thermal conductive auxiliary materials, and then through the special process to synthesize thermal conductive silica gel sheet. Thermal conductive silica gel sheet is a polymer compound thermal conductive material with organic silicone resin as bonding base material and thermal conductive powder as filling

Three. Thermal conductive silica gel can be divided into thermal conductive silica gel sheet and non-silicon silica gel sheet

The insulation performance of most thermal conductive silica gel sheets is determined by the insulation performance of filler particles.

1. Thermal conductive silicone gasket

Thermal conductive silica gel sheet is divided into many small categories according to the thermal conductivity of the product and the surface feeding, none of which have their own different characteristics

2. Non-silicon silicone gasket

Non-silicon silicone gasket is a kind of material with high thermal conductivity. It is double-sided self-adhesive and exhibits low thermal resistance and better electrical insulation characteristics under low compression force when assembling electronic components. It can work stably at -40℃~150℃. Meet the flame retardant grade requirements of UL94V0

Four: the working principle of thermal conductive silica gel sheet

General: The thermal conductivity of thermal conductive silica gel sheet depends on the interaction between polymer and thermal conductive filler. Different kinds of fillers have different thermal conductivity mechanisms

1. Thermal conductivity mechanism of metal packing

The heat conduction of the metal filler is mainly carried out by the movement of the electrons, and the corresponding heat is transferred in the process of the movement of the electrons

2. Thermal conductivity mechanism of non-metallic packing

The heat conduction of nonmetallic packing mainly depends on phonon heat conduction, and its heat diffusion rate mainly depends on the vibration of adjacent atoms or binding groups. Including metal oxides, carbides and nitrides, etc