Ceramic PCB (Alumina PCB)

What is Ceramic PCB ?

Ceramic PCB or calls Alumina PCB is a kind of heat conducting ceramic powder and organic binder which is a printed circuit board with high thermal conductivity and a low expansion coefficient (CTE), the ceramic raw material are almost based on Alumina (Al2O3), Aluminum Nitride (ALN), or Beryllium Oxide (BeO).

Ceramic PCB features thermal conductivity that is more than 90 times of that of epoxy glass fiber, leading to excellent conduction cooling, which can make a quick effect on transferring heat away from hot spots and dissipating it over the whole surface. Moreover, components on ceramic PCBs usually feature a lower junction temperature (Tj) than that on ordinary PCBs.

Ceramic PCB are capable of providing optimal solutions for defeating thermal cycle failure because they share compatible CTE with leadless ceramic chip carrier and feature higher thermal conductivity, higher stability and inertia. What’s more, ceramic PCB is fabricated with LAM technology, which is a laser rapid activation metallization technology. So Ceramic PCB is highly versatile that can take place of the entire traditional printed circuit board with a less complicated construction with enhanced performance.

General Properties (Alumina PCB):

1, Base material : 96% or 98% Alumina (Al2O3), Aluminum Nitride (ALN), or Beryllium Oxide (BeO)
2, Conductors material: Plating Cu, silver palladium (AgPd), gold pllladium (AuPd); DCB (Direct Copper Bonded)
3, Application temp: -55~850C
4, Thermal conductivity value: 24W~28W/m-K (Al2O3); 150W~240W/m-K (ALN) , 220~250W/m-K ( BeO)
5, Max compression strength: >7,000 N/cm2
6, Breakdown Voltage (KV/mm): 15/20/28 for 0.25mm/0.63mm/1.0mm respectively
7, Thermal expansion conefficient(ppm/K): 7.4 (under 50~200C)

Compared with traditional PCBs whose substrate materials are epoxy glass fiber, polyimide, polystyrene and phenolic resin,Alumina PCB feature the following properties:
• Excellent thermal conductivity
• Chemical erosion resistant
• Agreeable mechanical intensity
• Compatible with CTE of components
• Easy to implement high-density tracing.

Main Features:

Durability :
There is a durability in the Ceramic PCB fabrication process. Because of the essential properties of ceramics, specially the toughness, which can make sure that preventing your board from daily wear and tear. Because the ceramic PCB has a quite slow aging property with the consistency of based PCB, it can be changed without worry of replacement soon. What’s more, it has a high thermal resistance as it can change to a slowed decomposition process so that extends useful life length.
Stability :
There is a stable dielectric property because of the use of Ceramic PCB , the balance can change into a limited radio frequency loss so that increasing the applicability of electronic device. What’s more, despite the outward toughness, ceramic has natural resistance for most chemical used because of the ceramic base PCB. Therefore, the resistance to chemical will change to resistance to daily moisture, solvents as well as consumables.
Versatility :
It is no wonder that incorporation of metal core PCB can achieve a lot of applications with a high melting point. The noble metal paste can be highly unfailing conductors because of sintering technology. So there is no doubt that the use of Ceramic PCB makes a effect on being high processing temperatures while there are different devices for different operating temperatures. What is interesting is the it also allows for good thermal conductivity and distribution of heat to the different position of a device.
Adaptability :
At last, one of the prominent advantages of Ceramic PCB is that using the metal core in the engineering process. It can change to be the rigid carriers so that provides mechanical stiffness, making it easy to use between fluids and solids as the roughness and wear resistance are great, so it can be used in various industrial position.

Main advantages:

1. Higher thermal conductivity
2. More matching coefficient of thermal expansion
3. Lower resistance metal film aluminum oxide ceramic circuit board
4. The solderability of the substrate is good and the use temperature is high.
5. Good insulation
6. Low frequency loss
7. be assembled in high density
8. Free of organic constituent, resistant to cosmic rays, high reliability in aerospace and long service life
9. The copper layer does not contain an oxide layer and can be used for a long time in a reducing atmosphere.

Typical applications:  

1、 Alumina PCB for Spotlights and high-current UV-LEDs
2、Alumina PCB for Exchange converters
3、 Alumina PCB for Power controllers
4、 Alumina PCB for Variable optical systems
5、 Alumina PCB for Power regulators for cars
6、Alumina PCB for Industrial power equipment
7、 Alumina PCB for Semiconductor refrigeration devices
8、Alumina PCB for IC arrays
9、Alumina PCB for Laser Printers
10、Alumina PCB for Audio amplifiers
11、Alumina PCB for Solar cell substrates
12、Alumina PCB for High power transistors and transistor arrays
13、Alumina PCB for Power applications
14、Alumina PCB for Laser Lidar
15、Alumina PCB for Photoelectric conversionr
16、Alumina PCB for Thermoelectric conversionr
17、Alumina PCB for RF power supply(RF Generator)
18、Alumina PCB for Industrial Sensors