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Al2O3 is the most commonly used substrate material in ceramic substrate because of its high strength and chemical stability compared to most other oxide ceramics in mechanical, thermal and electrical properties, and rich raw material sources, suitable for a variety of technical manufacturing and different shapes. According to the percentage of alumina (Al2O3) can be divided into: 75 porcelain, 96 porcelain, 99.5 porcelain. With different amounts of alumina, its electrical properties are almost unaffected, but its mechanical properties and thermal conductivity vary greatly. There is more glass in the substrate with low purity and the surface roughness is large. The higher the purity of the substrate, the cleaner, compact, the lower the dielectric loss, but the higher the price.
BeO
It has higher thermal conductivity than aluminum. It is applied to the occasions where high thermal conductivity is needed. It decreases rapidly after the temperature exceeds 300℃, but its toxicity limits its own development.
AlN
AlN are ceramics with aluminum nitride powder as the main crystalline phase. Compared with alumina ceramic substrate, the insulation resistance, insulation resistance and dielectric constant are higher. Its thermal conductivity is 7~10 times that of Al2O3, and its thermal expansion coefficient (CTE) is approximately matched with silicon wafer, which is very important for high-power semiconductor chips. In the production process, the thermal conductivity of AlN is greatly affected by the content of residual oxygen impurities, and the decrease of oxygen content can significantly improve the thermal conductivity. At present, it is no problem that the thermal conductivity of the production level reaches 170W/ (m·K).
For the above reasons, it can be known that alumina ceramics are in a leading position in the fields of microelectronics, power electronics, hybrid microelectronics and power modules due to their superior comprehensive performance. Compared with the same size on the market (100mm×100mm×1mm), different materials of ceramic substrate price: 96% alumina 9.5 yuan, 99% alumina 18 yuan, aluminum nitride 150 yuan, beryllium oxide 650 yuan, you can see that different substrate price gap is also relatively large.
Hitech Circuits is a professional and reliable manufacturer of Ceramic PCBs, with many years of experience in making Ceramic PCBs, which enables the manufacture of high technology, high quality and difficult performance boards, and guarantees the quality and reliability of every product delivered to customers. If you have the need to make Ceramic PCB, welcome to contact us!
Alumina Ceramic PCB
Application of Ceramic PCB
1. High power power electronics module, solar panel module, etc
2. High frequency switching power supply, solid state relay
3. Automotive electronics, aerospace, military electronics
4. High power LED lighting products
5. Communication antenna, automobile igniter
Why use Ceramic PCB instead of other PCB boards?
Ordinary PCB is usually made of copper foil and substrate bonding, and the substrate is mostly glass fiber (FR-4), phenolic resin (FR-3) and other materials, adhesives are usually phenolic, epoxy, etc. The main material of ceramic substrate is alumina (Al2O3), beryllium oxide (BeO), aluminum nitride (AlN) and other metal oxide ceramics, the performance of the two is quite different.
● Plate rigidity, ordinary PCB basically belongs to chemical fiber material, its environment, temperature, processing technology and other conditions, its rigidity is far less than ceramic substrate; The latter has strong thermal stability and small coefficient of thermal expansion, which can be used in harsher environments.
● Heat dissipation performance, ceramic substrate heat dissipation performance is excellent, very suit
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