The attenuation problems and solutions of Nodi's thermal conductive silicone sheets in 5G communication devices in Dongguan

With the rapid advancement of 5G communication technology, the computing performance of base stations, servers, and terminal devices has witnessed a leapfrog growth. However, the high power consumption and heat dissipation challenges that come along have become increasingly thorny. Heat dissipation management has emerged as a core factor determining the performance and stable operation of 5G devices. As a key material in the field of thermal management, thermal conductive silicone sheets, with their excellent flexibility, insulation properties, and thermal conductivity, play an indispensable role in the heat dissipation system of 5G communication devices and are widely applied. Nevertheless, during long-term operation, eroded by high-temperature and high-humidity environments or under the continuous action of mechanical stress, thermal conductive silicone sheets will gradually experience performance degradation such as a decrease in thermal conductivity, a decline in elasticity, and interface separation. This, in turn, will lead to a reduction in the heat dissipation efficiency of the devices and an increase in the operating temperature, posing a serious threat to the reliability and service life of the device systems. 

Main Causes of the Degradation of Thermal Conductive Silicone Sheets

Material Aging

During the continuous operation of 5G devices, exposure to the harsh environment of high temperature and high humidity for a long time makes the silicone matrix of the thermal conductive silicone sheets highly prone to chemical degradation and physical aging. As the aging process intensifies, the material gradually hardens and becomes brittle, and the internal molecular chains break and reorganize, resulting in the destruction of the thermal conduction pathways and a significant decrease in the thermal conductivity, ultimately leading to a substantial decline in the heat dissipation efficiency of the devices.

Impact of Thermal Cycling

During the operation of 5G devices, frequent start-stop operations and dynamic power fluctuations keep the thermal conductive silicone sheets in a harsh working condition of alternating hot and cold. Under the action of this cyclic stress, the silicone sheets repeatedly experience periodic deformations of thermal expansion and cold contraction. Over time, the internal stress of the material accumulates continuously, making it highly likely to trigger the initiation and expansion of microscopic cracks, and then lead to the phenomenon of structural delamination. These damages severely disrupt the continuity of heat conduction of the silicone sheets, significantly reducing their heat dissipation efficiency and affecting the stable operation of the devices.

Increase in Contact Thermal Resistance

During the continuous operation cycle of 5G devices, the thermal conductive silicone sheets are long-term affected by the dual action of mechanical pressure and temperature gradients, making them prone to compression fatigue and migration of filler particles. On one hand, repeated mechanical compression gradually reduces the elasticity of the silicone sheets, resulting in a decrease in the degree of adhesion between the material and the surfaces of the heat sinks and electronic components. On the other hand, the high thermal conductivity filler particles are displaced under stress, disrupting the uniformity of the internal thermal conduction network of the material. The combined effect of these two factors significantly increases the interface contact thermal resistance, severely weakening the heat conduction efficiency and thus affecting the overall heat dissipation performance of the devices.

Environmental Pollution

In the actual operation scenarios of 5G devices, dust, oil stains, and various chemical pollutants in the external environment continuously penetrate the surface and internal structure of the thermal conductive silicone sheets through diffusion and permeation. These pollutants not only form an insulating layer on the surface of the silicone sheets, hindering heat conduction, but also undergo complex physical and chemical reactions with the silicone matrix, leading to changes in the internal microstructure of the material and an increase in porosity. With the continuous accumulation and penetration of pollutants, the thermal conduction pathways of the silicone sheets are gradually blocked, and their thermal conductivity decreases significantly, ultimately affecting the heat dissipation effect and operational stability of the devices.

Mechanical Stress Damage

In complex application scenarios, 5G communication devices need to withstand the test of dynamic loads such as high-frequency vibration and mechanical shock for a long time. During this process, the thermal conductive silicone sheets continuously bear periodic stress and instantaneous impact force, causing fatigue damage to their internal structure. Over time, phenomena such as plastic deformation and delamination of the material gradually occur, severely disrupting the close contact between the silicone sheets and the electronic components and heat sinks, resulting in the interruption of the thermal conduction path and ultimately greatly weakening the heat dissipation efficiency of the devices and endowing the stable operation of the system.

Solutions

Selection of High-performance Thermal Conductive Silicone Sheets

Select thermal conductive silicone sheets with high thermal conductivity, low thermal resistance, and excellent durability. For example, products made of modified silicone materials and added with efficient thermal conductive fillers (such as boron nitride, aluminum oxide, or carbon nanotubes) can effectively reduce the problem of long-term degradation.

Optimization of the Installation Process

In the installation of thermal conductive silicone sheets, precise process control is required to achieve uniform force distribution, strictly avoiding material deformation caused by excessive extrusion and the problem of bonding failure due to uneven local stress. At the same time, with the help of precise design and assembly technology, ensure seamless bonding between the silicone sheets and the surfaces of electronic components and heat sinks, minimizing the air gaps, effectively reducing the interface thermal resistance, and significantly improving the heat conduction efficiency and the heat dissipation performance of the devices.

Adoption of Enhanced Coating Technology

By coating the surface of the thermal conductive silicone sheets with an oxidation-resistant and moisture-resistant protective coating with high density and stability, a solid physical barrier can be built. This protective layer can not only effectively isolate the intrusion of environmental pollutants such as dust, oil stains, and corrosive gases but also resist the chemical erosion of the silicone sheets by the hot and humid environment, slowing down the material aging process from the root, significantly extending the service life and performance cycle of the thermal conductive silicone sheets, and providing a reliable guarantee for the long-term stable operation of 5G devices.

Regular Maintenance and Replacement

For 5G communication devices that are in high-load and high-temperature working conditions for a long time, it is crucial to establish a dynamic operation and maintenance management system. It is recommended to formulate a scientific and reasonable regular maintenance plan based on data such as the device operation duration and environmental parameters, and use technical means such as infrared thermal imaging and ultrasonic detection to accurately evaluate the aging degree and performance degradation of the thermal conductive silicone sheets. Once problems such as hardening, cracking, or abnormal thermal resistance of the material are found, timely replacement is required, thus ensuring the continuous and efficient operation of the heat dissipation system and effectively avoiding the risk of device failures caused by heat dissipation failures.

Improvement of the Heat Dissipation System Design

In the design of the heat dissipation system of 5G devices, the thermal conductive silicone sheets can be organically combined with efficient heat dissipation solutions such as heat pipes, vapor chambers, or liquid cooling technology to construct a composite heat dissipation architecture. This multi-technology collaborative heat dissipation system can give full play to the advantages of each component: the thermal conductive silicone sheets are responsible for optimizing the thermal conduction interface between electronic components and heat dissipation parts, the heat pipes and vapor chambers quickly conduct and evenly spread the heat, and the liquid cooling technology realizes efficient heat transfer and emission. Through the complementary functions, this composite structure effectively distributes the heat dissipation pressure of a single material, greatly improving the comprehensive efficiency of the heat dissipation system and meeting the heat dissipation requirements of 5G devices with high power and high density.

Conclusion

In the heat dissipation system of 5G communication devices, thermal conductive silicone sheets, with their excellent flexibility and thermal conduction performance, have become the core material to ensure the efficient operation of the devices. However, due to the long-term effect of complex working conditions and harsh environments, the performance degradation of the material has become a key factor restricting the stability of the heat dissipation system. By preferentially selecting high-performance materials, innovating the installation process, strengthening environmental protection measures, and establishing a scientific regular maintenance mechanism, the material aging process can be systematically slowed down, and the service life and reliability of the thermal conductive silicone sheets can be significantly improved, building a solid heat dissipation guarantee for the stable operation of 5G devices.