Light weight aluminum nitride (AlN), as a structurally steady hexagonal wurtzite covalently bonded compound, has shown broad application possibility in the areas of electronic devices and optoelectronics due to its distinct physical and chemical residential properties. Its crystal framework is based upon an AlN4 tetrahedron as the fundamental system, with room group P63mc coming from the hexagonal crystal system. This framework gives AlN a series of excellent residential or commercial properties.
Highlight of AlN ceramics
High thermal conductivity: Compared to alumina porcelains, the thermal conductivity of AlN is 5 to 10 times higher. Theoretically, the thermal conductivity of solitary crystal products at 300K can get to 319W/(m · K).
Thermal growth matching: Its thermal growth coefficient is similar to that of semiconductor silicon products, which is conducive to device combination.
Excellent mechanical and electrical homes: It has high insulation resistance and low dielectric loss and appropriates for high-reliability digital product packaging.
Practical for multi-layer electrical wiring: sustains miniaturization and high-density assimilation of product packaging.
Environmentally friendly: The non-toxic attributes satisfy modern environmental management demands.
(Aluminum Nitride (AlN) Crystal Structure)
Variables impacting the thermal conductivity of AlN porcelains
Although the theoretical thermal conductivity of AlN is incredibly high, its efficiency in useful applications is restricted by many elements, mostly including:
1. Microstructure: Phonon spreading is the crucial mechanism of warm conduction. Grain limits, user interfaces, second phases, problems, and so on, will certainly affect the mean cost-free course of phonons, therefore impacting thermal conductivity. High-purity, low-defect single-crystal AlN has a much longer phonon-free course and higher thermal conductivity.
2. Oxygen pollutant material: The solid affinity of AlN with oxygen makes it very easy to present oxygen pollutants, developing light weight aluminum oxide films and lattice flaws, such as aluminum jobs, which dramatically minimize the mean cost-free path of phonons and thus minimize thermal conductivity. When the oxygen concentration is below 0.75%, oxygen atoms generally change nitrogen atoms; surpassing this concentration will certainly bring about the loss of light weight aluminum jobs and the generation of ductility defects, additionally affecting thermal conductivity.
3. Sintering process and ingredients: By selecting ideal sintering ingredients (such as Y2O3-Li2O, Y2O3-CaC2 and other composite systems), densification sintering can be achieved at a reduced temperature level while minimizing the formation of oxygen impurities and 2nd stages, successfully improving the thermal conductivity of AlN porcelains. The function of these additives is to detoxify the grain borders, maximize the microstructure, and assist in the efficient transmission of phonons.
Comprehensive strategy
(TRUNNANO Aluminum Nitride (AlN) Powder)
In order to get AlN porcelains with high thermal conductivity, it is essential to take into consideration the pureness of the material thoroughly, the sintering problems and the selection of additives to lessen interior defects, especially to regulate the web content of oxygen contaminations and enhance the microstructure.
By finely regulating the sintering process and embracing an efficient composite sintering additive system, it is anticipated that the high thermal conductivity AlN substrate required for large-scale manufacturing applications can be achieved while making sure material performance. This is not just essential for boosting the warmth dissipation performance of electronic gadgets, yet additionally provides a key product basis for advertising the growth of semiconductor modern technology.
Provider of 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 aluminum nitride thermal conductivity, please feel free to contact us and send an inquiry.
Inquiry us