Thermal Management and Bonding Process of Electronic Circuits

Thermal Management and Bonding Process of Electronic Circuits As electronic devices become increasingly smaller and more complex, thermal management of microelectronic particles has become a critical issue. Particularly in recent years, the widespread use of power conductors and batteries has highlighted the necessity of achieving faster heat transfer in processes occurring at 100°C and above.   Thermally conductive adhesives are generally materials that enable high-efficiency transfer of the high temperature spread over a small surface area of microchips and similar electronic circuit components to the circuit's cooling element, while providing mechanical bonding. With the growing importance of thermal management, chemical resistance, low thermal expansion, and temperature stability have become significant in protecting the system. Epoxy resins are successfully used in adhesive and coating solutions due to their excellent adhesion strength, low shrinkage, and fast/easy curability; however, they create an inherently brittle structure due to their low thermal resistance and limited flexibility. Silicone polymers are needed to overcome this problem. Silicone polymers have advantages over epoxy resins in protecting electronic systems thanks to their properties such as high temperature resistance, modifiability, hydrophobic nature, and high flexibility coefficient under pressure. Obtaining thermal conductivity of silicone materials is based on the principle of mixing polydimethylsiloxane containing vinyl groups with powders of crystals and metals (such as graphite, aluminum, copper, gold, silver, etc.) and curing with a platinum catalyst. Heat transfer is achieved through the vibration and rotational movement of chain molecules. Thermal conductivity depends on the crystallization degree of the polymer. Silicone polymers are electrically insulating; for neutral silicone polymers, the thermal conductivity coefficient generally ranges between 0.1 - 0.5 W/m.K. At this point, silicone adhesives with thermal conductivity that can reach the range of 8-10 W/m.K are obtained by adding certain metal powders and minerals with high thermal conductivity for filling purposes. Considering that an average thermal paste has heat transfer on the order of 1 W/m.K, one can understand the advantages that a highly thermally conductive adhesive would provide. Thermal Interface Materials are used to fill the gap between a heated processor in an electronic circuit and the cooling circuit that serves to cool this processor. These materials enable heat to spread from the processor to the cooling circuit, allowing the processor's lifespan to extend and its performance to remain stable. As an adhesive, a Thermal Interface Material both fixes the processor to the printed circuit board, eliminating the need for screws and clips, and solves the processor's necessary heat management issue for performance. Through this, the entire circuit can also be filled with thermally conductive potting material to protect it from harmful contaminants such as moisture, dust, and rain from external sources. In this way, external contaminants are prevented from reaching the electronic circuit, while cooling of the circuit's heated components is enabled. As Latro Kimya, we want to be your solution partner throughout your production process with high-temperature thermally conductive silicone materials that can be cured at room temperature, at high heat, or with UV light, available as single or two-component systems, increasing the efficiency and working life of electronic circuit components while ensuring their safety.  

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