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Thermal grease (also called CPU grease, heat paste, heat sink compound, heat sink paste, thermal compound, thermal gel, thermal interface material, or thermal paste) is a kind of thermally conductive (but usually electrically insulating) compound, which is commonly used as an interface between heat sinks and heat sources (e.g., high-power semiconductor devices). The main role of thermal grease is to eliminate air gaps or spaces (which act as thermal insulator) from the interface area in order to maximize heat transfer. Thermal grease is an example of a thermal interface material.

As opposed to thermal adhesive, thermal grease does not add mechanical strength to the bond between heat source and heat sink. It will have to be coupled with a mechanical fixation mechanism such as screws, applying pressure between the two, spreading the thermal grease onto the heat source.

Due to differences of metal content in CPUs and GPUs, thermal paste cannot be used universally, and device-specific thermal paste should be applied.


Video Thermal grease



Composition

Thermal grease consists of a polymerizable liquid matrix and large volume fractions of electrically insulating, but thermally conductive filler. Typical matrix materials are epoxies, silicones, urethanes, and acrylates; solvent-based systems, hot-melt adhesives, and pressure-sensitive adhesive tapes are also available. Aluminum oxide, boron nitride, zinc oxide, and increasingly aluminum nitride are used as fillers for these types of adhesives. The filler loading can be as high as 70-80% by mass, and raises the thermal conductivity of the base matrix from 0.17-0.3 W/(m·K) (watts per meter-kelvin) up to about 2 W/(m·K).

Silver thermal compounds may have a conductivity of 3 to 8 W/(m·K) or more. However, metal-based thermal grease can be electrically conductive and capacitive; if some flows onto the circuits, it can cause malfunctioning and damage.


Maps Thermal grease



Filler properties


How to apply Thermal Paste or Thermal Grease - PcInside.info
src: www.pcinside.info


See also

  • Computer cooling
  • Hot-melt adhesive
  • Phase-change material
  • Thermally conductive pad
  • Thermal adhesive
  • List of thermal conductivities

T650 High-Performance 0.8 W/m-K Thermal Grease for General Purpose ...
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References


Gray Thermal Grease HY510 Heatsink Compound Paste For CPU GPU VGA ...
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External links

  • Barros, Daniel (2006-01-12). "Thermal paste buying guide". 

Source of the article : Wikipedia

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