Heat sinks are widely used in the semiconductor industry, and the most commonly used ones are Al2O3 heat sinks and AlN heat sinks. However, with the development of electronic devices towards high-frequency and high-power environments, traditional heat sink materials are gradually unable to meet the heat dissipation needs.
Radiator made of diamond heat sink has the characteristics of fast heat dissipation and high thermal conductivity, which helps to dissipate the potential destructive heat generated in many electronic and photon devices, including high-power RF devices used in satellite communication, high-power laser diodes, high-power laser reflectors, and disk lasers. Compared with traditional thermal management materials, these diamond heat sinks have multiple advantages, making them valuable in applications where efficient heat dissipation is crucial.
The electrical and thermal properties of diamond are crucial for its use in heat sinks.
The highest thermal conductivity. Diamond is a special type of thermal conductor with a thermal conductivity of approximately 1000-2200 W/mK, depending on the product grade. This is significantly higher than other common materials such as copper (400 W/mK) and aluminum (220 W/mK). This high thermal conductivity enables diamond to transfer heat more effectively from a heat source than any other material.
Best electrical insulator. Diamond is not only the best thermal conductor, but also an excellent electrical insulator. It has electrical characteristics similar to glass and ceramics, which have been widely used for electrical insulation for over a century. Therefore, diamond radiators are the preferred choice for any application that requires the highest possible heat flux and electrical isolation. That's why many of its applications involve high-power electronic or photonic components.
Diamond has several other advantages that may be important considerations in certain radiator applications.
Light. There are two reasons why diamond radiators are lightweight. Firstly, diamond is a naturally lightweight material. Secondly, as it is an effective insulator with extremely high breakdown performance, the heat sink can be very thin. This is an advantage in satellites and other aerospace applications, where the entire system weight must be minimized.
Thermal stability. Diamond has a lower coefficient of thermal expansion, which means it does not significantly expand or contract with temperature changes. This feature helps to maintain the integrity of equipment such as heat sinks that are affected by thermal gradients. It also improves the long-term stability of these devices.
Corrosion resistance. Diamond has strong resistance to chemical corrosion, including immunity to strong acids, bases, and even organic solvents. This makes diamond radiators very suitable for industrial and other applications that may encounter harsh environments.
Extraordinary hardness. As most readers already know, diamond is one of the hardest known materials, which is why synthetic diamond is widely used to coat saw blades and other edge tools. In the context of heat dissipation, this toughness is beneficial for applications that require mechanical durability and wear resistance.
The CVD diamond prepared by CSMH combines these excellent physical and chemical properties, and has a lower cost than natural diamond. It can prepare various geometric shapes and has broad application prospects in industrial fields such as electronics, optics, thermodynamics, and machinery. At present, there are mature products available: diamond wafers, diamond windows, diamond heat sinks, diamond heterojunction integrated composite substrates, etc. Among them, the surface roughness of diamond wafer is Ra<1nm, and the thermal conductivity of diamond heat sinks is 1000-2200W/(m.k).
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