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

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Light weight aluminum nitride (AlN), as a structurally secure hexagonal wurtzite covalently bonded compound, has revealed broad application possibility in the fields of electronics and optoelectronics due to its distinct physical and chemical residential properties. Its crystal framework is based on an AlN4 tetrahedron as the standard unit, with space team P63mc coming from the hexagonal crystal system. This framework gives AlN a series of superb buildings.

Highlight of AlN ceramics

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

Thermal development matching: Its thermal development coefficient resembles that of semiconductor silicon products, which is conducive to tool assimilation.

Excellent mechanical and electrical homes: It has high insulation resistance and reduced dielectric loss and is suitable for high-reliability digital product packaging.

Convenient for multi-layer wiring: sustains miniaturization and high-density integration of packaging.

Eco-friendly: The non-toxic qualities meet modern-day environmental management demands.

Variables influencing the thermal conductivity of AlN porcelains

Although the theoretical thermal conductivity of AlN is incredibly high, its performance in sensible applications is restricted by numerous aspects, mostly including:

1. Microstructure: Phonon spreading is the crucial device of heat conduction. Grain limits, interfaces, 2nd stages, issues, etc, will affect the mean complimentary path of phonons, therefore 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 strong fondness of AlN with oxygen makes it easy to introduce oxygen pollutants, creating aluminum oxide films and latticework issues, such as light weight aluminum jobs, which significantly lower the mean cost-free path of phonons and therefore minimize thermal conductivity. When the oxygen concentration is listed below 0.75%, oxygen atoms mainly replace nitrogen atoms; surpassing this focus will certainly result in the loss of light weight aluminum vacancies and the generation of ductility issues, further influencing thermal conductivity.

3. Sintering process and additives: By choosing suitable sintering ingredients (such as Y2O3-Li2O, Y2O3-CaC2 and various other composite systems), densification sintering can be attained at a reduced temperature level while minimizing the development of oxygen contaminations and 2nd phases, successfully improving the thermal conductivity of AlN ceramics. The function of these additives is to cleanse the grain boundaries, enhance the microstructure, and help with the effective transmission of phonons.

Comprehensive approach

In order to obtain AlN porcelains with high thermal conductivity, it is required to think about the purity of the material adequately, the sintering problems and the selection of additives to lessen inner defects, particularly to regulate the content of oxygen impurities and enhance the microstructure.

By finely regulating the sintering procedure and taking on a reliable composite sintering additive system, it is expected that the high thermal conductivity AlN substratum required for massive production applications can be accomplished while guaranteeing material performance. This is not only critical for boosting the warmth dissipation efficiency of digital gadgets, yet also provides a crucial product basis for advertising the development of semiconductor innovation.

Distributor of Light Weight 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 aluminum nitride, please feel free to contact us and send an inquiry.

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