Light weight aluminum nitride (AlN), as a structurally stable hexagonal wurtzite covalently adhered compound, has revealed broad application possibility in the areas of electronics and optoelectronics as a result of its special physical and chemical properties. Its crystal structure is based on an AlN4 tetrahedron as the fundamental unit, with room group P63mc belonging to the hexagonal crystal system. This framework gives AlN a series of superb residential or commercial properties.
Highlight of AlN ceramics
High thermal conductivity: Compared with alumina ceramics, the thermal conductivity of AlN is 5 to 10 times higher. Theoretically, the thermal conductivity of solitary crystal materials at 300K can get to 319W/(m · K).
Thermal expansion matching: Its thermal expansion coefficient resembles that of semiconductor silicon materials, which contributes to gadget combination.
Outstanding mechanical and electric properties: It has high insulation resistance and low dielectric loss and is suitable for high-reliability digital product packaging.
Hassle-free for multi-layer circuitry: supports miniaturization and high-density combination of product packaging.
Eco-friendly: The non-toxic attributes meet modern-day environmental protection requirements.
(Aluminum Nitride (AlN) Crystal Structure)
Aspects influencing the thermal conductivity of AlN porcelains
Although the theoretical thermal conductivity of AlN is incredibly high, its performance in functional applications is limited by many variables, primarily including:
1. Microstructure: Phonon scattering is the crucial system of heat conduction. Grain limits, interfaces, second stages, problems, and so on, will certainly affect the mean free course of phonons, consequently influencing thermal conductivity. High-purity, low-defect single-crystal AlN has a much longer phonon-free course and higher thermal conductivity.
2. Oxygen impurity material: The solid affinity of AlN with oxygen makes it very easy to present oxygen contaminations, developing light weight aluminum oxide films and latticework issues, such as light weight aluminum jobs, which considerably reduce the mean free path of phonons and hence reduce thermal conductivity. When the oxygen concentration is listed below 0.75%, oxygen atoms generally replace nitrogen atoms; surpassing this concentration will cause the disappearance of light weight aluminum jobs and the generation of ductility issues, better impacting thermal conductivity.
3. Sintering process and ingredients: By choosing appropriate sintering additives (such as Y2O3-Li2O, Y2O3-CaC2 and other composite systems), densification sintering can be achieved at a lower temperature level while minimizing the formation of oxygen pollutants and 2nd phases, properly improving the thermal conductivity of AlN ceramics. The role of these additives is to detoxify the grain limits, enhance the microstructure, and assist in the effective transmission of phonons.
Comprehensive approach
(TRUNNANO Aluminum Nitride (AlN) Powder)
In order to acquire AlN porcelains with high thermal conductivity, it is needed to think about the pureness of the material adequately, the sintering problems and the choice of additives to reduce internal flaws, especially to control the material of oxygen contaminations and enhance the microstructure.
By finely managing the sintering process and embracing an efficient composite sintering additive system, it is anticipated that the high thermal conductivity AlN substratum required for massive manufacturing applications can be achieved while making certain product performance. This is not just important for improving the heat dissipation efficiency of digital tools, however additionally gives an essential material basis for advertising the growth of semiconductor technology.
Distributor of Light Weight Aluminum Nitride AlN Powder
TRUNNANOÂ is a supplier of 3D Printing Materials with over 12 years experience in nano-building energy conservation and nanotechnology development. It accepts payment via Credit Card, T/T, West Union and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea. If you want to know more about aln conductivity, please feel free to contact us and send an inquiry.
Inquiry us