At room temperature, the thermal conductivity of diamond is three to five times that of copper. Meanwhile, diamond itself is also an excellent insulating material. Therefore, CVD diamond films can be utilized as heat sink materials (diamond heat spreader) for high-power optoelectronic components.
CVD (Chemical Vapor Deposition) diamond is produced when a mixture of carbon-containing gas (such as methane) and hydrogen is excited and decomposed at high temperatures and under pressures below standard atmospheric conditions. This process generates carbon atoms in a plasma state, which subsequently deposit and interactively grow on a substrate to form polycrystalline diamond (or, by controlling the deposition and growth conditions, single-crystal diamond can be deposited and grown).
Diamond Structure and Heat Conduction Principle
Due to diamond’s strong covalent bonds and regular crystalline structure, the probability of phonon scattering within it is extremely low, enabling phonons to propagate heat at an exceedingly high speed. This mode of phonon-mediated heat conduction in diamond allows it to maintain excellent thermal conductivity even at high temperatures, without experiencing a decline in thermal conductivity due to factors such as electron scattering, as is the case with metals.
Diamond's Thermal Conductivity: Features & Advantages
1. Ultra-high Thermal Conductivity
The thermal conductivity of our CVD diamond ranges around 1200-2000 W/(m·K), making it one of the materials with the best known thermal conduction properties. It is significantly higher than that of common metals such as copper (approximately 398 W/m·K), aluminum (approximately 200 W/m·K), as well as other non-metallic thermal conductive materials.
2. Excellent Thermal Stability
CVD diamond has an extremely high melting point and boiling point, enabling it to maintain stable performance under high-temperature environments. It is not prone to deformation, melting, or other phenomena, and can operate normally under extreme temperature conditions.
3. Low Coefficient of Thermal Expansion
CVD diamond has a relatively low coefficient of thermal expansion. When used in combination with other materials, it generates less thermal stress during temperature changes, which is beneficial for enhancing the stability and reliability of the materials and reducing damage caused by thermal expansion and contraction.
4. Good Chemical Stability
CVD diamond exhibits good chemical stability against most acids, bases, and organic solvents at room temperature, and is not easily eroded by chemical substances. It can maintain stable thermal conductivity in various chemical environments.
Diamond Heat Spreader Applications
1. High-performance Electronic Packaging Materials
Used in the packaging of chips for high-end electronic devices, such as computer CPUs, GPUs, etc.
2. Laser Equipment Heat Sinks
Due to diamond’s excellent thermal conductivity and optical transparency, it can serve as a critical heat dissipation component in laser equipment, and is widely applied in fields such as industrial laser processing and laser communication.
3. Aerospace Field
Diamond heat spreader can maintain stability under extreme temperature variations, effectively managing the temperature of internal equipment in spacecraft.
4. LED Lighting and Display Technology
Utilized in the fabrication of heat dissipation substrates for LED lighting and display products, it can effectively reduce the operating temperature of LED chips, thereby enhancing luminous efficiency and stability.
5. High-temperature Furnace Lining Materials
Diamond heat spreaders, when used as furnace lining materials, can not only withstand extremely high temperatures but also effectively conduct heat, thereby improving the thermal efficiency of the furnace and reducing energy consumption.
6. High-speed Train Braking System
When a high-speed train brakes, a significant amount of heat is generated. Diamond heat spreaders can enhance heat dissipation efficiency, reduce thermal fade, and improve the reliability and service life of the braking system.
7. New Energy Vehicles
Diamond heat spreaders can enhance battery heat dissipation efficiency, prevent battery overheating, and thereby improve the overall performance and safety of electric vehicles.
If you have any questions or need assistance in thermal management, please feel free to ask us. Our polycrystalline CVD diamond is a suitable choice.
Custom dimensions are available on request.
Team ACCURATE
info@accuratedia.com
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