Ceramic substrates are widely used in high-power LEDs because ceramic substrates have a good heat dissipation function. So, which is better for heat dissipation, ceramic substrate or aluminum substrate?
Aluminum substrate is a metal-based copper clad laminate with good heat dissipation function, which is widely used in LED lamps. Generally, the material of the circuit board is glass fiber, but because the LED generates a lot of heat, the aluminum substrate is generally used for the LED lamp, which can conduct heat quickly. However, if it involves high-power LED modules and requires extremely strong heat dissipation capabilities, ceramic substrates are required to replace them. The ceramic substrate is made of ceramic material, which has good heat dissipation performance and can avoid short-circuit damage caused by insufficient heat dissipation. It has the following properties:
1. Strong mechanical stress, stable shape; high strength, high thermal conductivity, high insulation; strong binding force, anti-corrosion.
2. Good thermal cycle performance, cycle times up to 50,000 times, high reliability.
3. Like the PCB board (or IMS substrate), it can etch various graphic structures; no pollution and no pollution.
4. The operating temperature range is -55C~850°C; the thermal expansion coefficient is close to that of silicon, which simplifies the production process of power modules.
The heat dissipation of ceramic substrates is more than 7 times that of aluminum substrates, among which ceramic substrates are divided into alumina ceramic substrates and aluminum nitride ceramic substrates, aluminum nitride ceramic substrates are 5 times the heat dissipation of alumina ceramic substrates.
