What are the factors that affect the thermal conductivity of PCB aluminum nitride (AlN) ceramic substrate? al nitride

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Aluminum nitride (AlN), as a structurally steady hexagonal wurtzite covalently adhered substance, has shown vast application capacity in the areas of electronics and optoelectronics due to its one-of-a-kind physical and chemical buildings. Its crystal framework is based upon an AlN4 tetrahedron as the standard system, with room group P63mc belonging to the hexagonal crystal system. This structure provides AlN a collection of exceptional properties.

Highlight of AlN ceramics

High thermal conductivity: Compared with alumina porcelains, the thermal conductivity of AlN is 5 to 10 times higher. Theoretically, the thermal conductivity of single crystal products at 300K can get to 319W/(m · K).

Thermal expansion matching: Its thermal growth coefficient is similar to that of semiconductor silicon materials, which contributes to tool assimilation.

Excellent mechanical and electrical properties: It has high insulation resistance and reduced dielectric loss and appropriates for high-reliability digital packaging.

Practical for multi-layer wiring: sustains miniaturization and high-density assimilation of product packaging.

Eco-friendly: The non-toxic qualities fulfill modern-day environmental protection demands.

Factors influencing the thermal conductivity of AlN porcelains

Although the theoretical thermal conductivity of AlN is very high, its performance in practical applications is restricted by lots of factors, primarily including:

1. Microstructure: Phonon spreading is the essential device of heat conduction. Grain borders, user interfaces, 2nd stages, flaws, and so on, will certainly affect the mean complimentary path of phonons, thus affecting thermal conductivity. High-purity, low-defect single-crystal AlN has a much longer phonon-free path and higher thermal conductivity.

2. Oxygen contamination content: The strong affinity of AlN with oxygen makes it easy to present oxygen contaminations, forming aluminum oxide movies and latticework issues, such as light weight aluminum openings, which dramatically reduce the mean cost-free course of phonons and thus reduce thermal conductivity. When the oxygen concentration is below 0.75%, oxygen atoms mostly replace nitrogen atoms; surpassing this focus will certainly cause the loss of aluminum openings and the generation of ductility issues, even more influencing thermal conductivity.

3. Sintering process and additives: By picking proper sintering ingredients (such as Y2O3-Li2O, Y2O3-CaC2 and other composite systems), densification sintering can be achieved at a lower temperature level while lowering the development of oxygen pollutants and second phases, efficiently enhancing the thermal conductivity of AlN porcelains. The duty of these additives is to purify the grain boundaries, maximize the microstructure, and promote the efficient transmission of phonons.

Comprehensive strategy

In order to obtain AlN ceramics with high thermal conductivity, it is essential to consider the pureness of the product thoroughly, the sintering problems and the option of additives to lessen internal issues, particularly to regulate the content of oxygen pollutants and enhance the microstructure.

By finely regulating the sintering process and embracing a reliable composite sintering additive system, it is expected that the high thermal conductivity AlN substratum needed for large-scale manufacturing applications can be attained while making sure material performance. This is not just important for enhancing the warm dissipation effectiveness of digital gadgets, yet also supplies a key material basis for promoting the growth of semiconductor modern technology.

Vendor of Aluminum Nitride AlN Powder

TRUNNANO 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 al nitride, please feel free to contact us and send an inquiry.

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