Introduction to alumina ceramic heat sink
The thermal cooling effect of alumina ceramic heat sink is divided into radiation cooling and direct heat conduction cooling.
Radiation cooling：
The radiation mechanism of ceramic materials is produced by two phonons and multi phonons of non resonant effect of random vibration. The emissivity of ceramics is about 0.82 ~ 0.94, while that of metals, such as aluminum and copper, is only 0.05. Many studies have shown that ceramic material or glaze itself has high infrared emissivity, which is an important parameter to replace the traditional aluminum heatsink.
Direct heat conduction cooling:
The traditional heat conduction insulating sheet is distributed as heating body → heat conduction layer → insulating layer → heat conduction layer → aluminum heatsink. When the heat is transmitted to the heat conduction layer through the heating body, the thermal effect is attenuated to a certain extent, It is then conducted to the insulating layer (such as polyester, Kapton, etc.), and its heat conduction is very low. It is further attenuated and then transmitted to the heat conduction layer. The ceramic heat sink is directly conducted through the ceramic sheet, which will not attenuate the hot sales because of the insulating layer, and can take away more heat in the same unit time.
Insulation of ceramics:
The application of ceramic heat sink insulation can reduce electromagnetic interference. Under the same unit volume, ceramic heat sink is superior to the heat dissipation characteristics of copper and aluminum, and can reduce the problems caused by electromagnetic interference and make the equipment operate more stably.
Benefits and Advantages:
Ceramic heatsink has the bebefits of insulation, high temperature resistance, oxidation resistance, acid and alkali resistance, cold and thermal shock resistance and low thermal expansion coefficient ensure the stability of ceramic heat sink in high and low temperature environment or other harsh environment. Ceramics are inorganic materials, more in line with environmental protection.
The biggest feature is the structure of micro holes in the ceramic itself, which greatly increases the heat dissipation area in contact with the air and greatly enhances the heat dissipation effect. Under the same year-on-year conditions, the heat dissipation effect is more obvious than that of ultra copper and aluminum in the natural convection state and in the closed environment.
Applications of Ceramic heatsink:
Ceramic heatsink is widely used in LED lighting, high-frequency welding machine, power amplifier / sound, power transistor, power module, chip IC, inverter, network / broadband, UPS power supply, high-power equipment,etc.
