Thermal Interface Material
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Thermal interface materials have been generally used in all heat dissipation modules to fill the gaps and uneven holes on the surface of the electronic materials, otherwise it will seriously hinder heat conduction. With the pursuit of high-power performance in electronic products, in addition to the pursuit of thermal conductivity of thermal interface materials, material reliability and the reduction of interface thermal resistance are more important issues. |
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Selection Guide
The types of thermal interface materials include thermal pad, thermal tape, thermal grease, and thermal putty. In order to accelerate heat transfer by filling the gap between the chip heat source and the heat sink, the heat energy of the chip is effectively transferred to the heat sink fins, which also improves the life of the chip and the product usage efficiency.
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| plate | paste | special type | ||||
| high thermal conductivity | high viscosity | low thermal resistance | high viscosity | Mature curing | Fast cooling | insulation |
| Thermal Pad | Thermal Tape | Thermal Grease | Thermal Putty | Potting Compound | Phase Change Materials | Thermal Insulation Rubber Cap |
| It can effectively reduce the contact thermal resistance between the surface of heat source and the contact surface of heat dissipation components. | With high thermal conductivity, high adhesiveness and low thermal resistance | Effective in filling uneven surface areas | A thermal interface material with a softness between thermal grease and thermal pad | Protecting electronic components from influences from the external environment after being cured | Good fluidity of the material after melting, it can completely fill the uneven gap on the surface. | Easy to install components，Reducing product weight |
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| Graphite Sheet | Thermal Composite Material | ||
| Thin_and_light | Containing_copper_foil | bendable | Good insulating，good tensile strength |
| Graphite Sheet | Graphene | Heat Spreader | Thermal Insulator |
| Ultra high thermal conductivity,electrical conductivity and EMI shielding effect | Graphene has good horizontal conductivity, will not have the problem of peeling and powder falling. | Metal-based, with a radiant paint coating, can more effectively in product’s heat dissipation. | Polyimine is used as a substrate and is commonly used in electronic products that require high electrical insulation. |
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When new electronic products are introduced, the IC process and chip efficiency are greatly increased according to the production process capability and market demand, and the user experience must be taken into account to pursue the thin, light weight, small, and high efficiency, resulting in high density of heat on the surface of the heating element. The heat is continuously transferred to the heat sink through thermal conduction, and eventually the thermal balance is achieved without overloading the product's mechanical components.Due to the contact surface of different components between products, there is a so-called interface thermal resistance to be considered when heat is transferred. Moreover, the surface of different components may have unevenness that is not visible to the naked eye, which greatly reduces the contact area between the two surfaces. In this case, it is necessary to rely on the Thermal Interface Material (TIM) to fill the micro voids and uneven surface holes created when the two materials are joined or contacted to reduce the resistance to heat transfer. By using different thermal interface materials, the most suitable thermal resistance, heat flux, compressibility, hardness can be selected for different product designs, which is the key point to be considered at the early stage of product design.
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