In the thermal conductivity industry, thermal conductivity is an important parameter reflecting the thermal conductivity of materials. However, in practical applications, it is often not enough to use thermal conductivity alone to assess whether the product is applicable. We often need to introduce another parameter (thermal resistance or thermal impedance) to help judge.

 

The definition of thermal resistance is the ratio between the temperature difference between the two ends of the object and the power of the heat source when heat is transferred to the object. It can be understood as the resistance encountered by heat on the heat flow path, reflecting the size of the medium or the heat transfer capacity between the mediums, and indicating the size of the temperature rise caused by 1W of heat, in K/W or °C/W. A simple analogy can be used to explain the meaning of thermal resistance. Heat exchange is equivalent to current, temperature difference is equivalent to voltage, and thermal resistance is equivalent to resistance.

 

At present, the main measures to reduce contact thermal resistance are:

1. Increase the pressure on the contact surface between objects to deform the protrusion on the object interface, thereby reducing the gap and increasing the contact surface.

2. Fill the gap between the two objects with the thermal conductive material, and try to exhaust the air, such as using thermal pads.