Selecting the Right Thermal Interface Materials for Your Application

With the development of microprocessors toward higher power, larger chip, and higher frequency, heat dissipation is one of the central issues. Thermal interface materials (TIMs), which are used between the chip and the heat spreader and between the heat spreader or the heat sink, play an increasingly important role in microprocessor cooling. TIMs are products that conduct heat between two or more solid mating surfaces are cost-effective and energy-efficient passive thermal management solutions that help maintain recommended operating temperatures in electronic devices or components.

TIMs are considered a significant element of any efficient thermal management system. These materials are widely used in consumer and industrial electronic systems to ensure efficient heat dissipation and prevent overloads of local temperature. Some industries where TIMs find applications include telecommunications, servers, gaming, automotive, and aerospace.

There are several TIMs available to suit different electronics thermal management requirements. Snowlucky Technologies specialize in selectiingn the right TIMs for your application.

TIMs improve heat transfer across the interface, but they also account for a major part of the thermal resistance of the entire system. While choosing the right TIM for your application, here are some of the characteristics you should consider.

Thermal Conductivity/Thermal Resistance

Thermal conductivity determines the amount of heat TIMs can transfer across the interface, impacting its thermal performance. A material with higher thermal conductivity will offer a better heat transfer rate and is an important metric when comparing different materials.

Ease of Application and Installation

The overall cost of your thermal management system based on TIMs will also depend on the cost associated with application and assembly. For example, with grease as a TIM, you will require additional processes such as clamping, secondary curing operation, and mechanical attachment. These requirements not only add to the cost but also increase the assembly time. However, if the thermal management requirements are minimal, you can benefit from adhesive thermal tape instead of grease.

Reliability in Performance

TIMs should perform consistently and reliably throughout the lifespan of an electronics device. Electronic devices are designed to last up to a decade, while avionics and telecommunication devices are built to last through decades. The dwindling size of electronics devices and components, along with an increase in power densities, turned thermal management into a major concern in electronics. It also ensures optimum performance and reliability of the devices and components.

Compatibility with Heat Sink Material

Compatibility is an easily overlooked factor as it’s not a major issue in most electronics applications. However, there are a number of use cases in which it can bring significant issues. For instance, exposure to silicone vapors damages many gases and humidity sensors, restricting them from using silicone-based TIMs in the same components.  Therefore, it is always a good idea to verify the compatibility of TIMs with any thermal adhesives or heat sink materials before implementation.

Environmental Factors

There are a good number of environmental factors you must consider along with thermal changes before using TIMs. You may check the resistance of a gap filler or a TIM against environmental conditions such as salt mist, corrosive gases, and high humidity. Since TIM layers are usually very thin and placed between two surfaces, it is not likely to be completely exposed to these adverse environmental conditions. But, with gap filling material, it may be more likely to be affected by challenging environments.