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

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Aluminum nitride (AlN), as a structurally secure hexagonal wurtzite covalently bonded compound, has actually shown broad application possibility in the fields of electronics and optoelectronics as a result of its distinct physical and chemical properties. Its crystal framework is based upon an AlN4 tetrahedron as the standard unit, with area team P63mc coming from the hexagonal crystal system. This structure offers AlN a collection of exceptional residential properties.

Main features 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 single crystal materials at 300K can reach 319W/(m · K).

Thermal expansion matching: Its thermal development coefficient resembles that of semiconductor silicon products, which is conducive to gadget combination.

Outstanding mechanical and electric properties: It has high insulation resistance and low dielectric loss and appropriates for high-reliability electronic product packaging.

Hassle-free for multi-layer electrical wiring: supports miniaturization and high-density assimilation of packaging.

Environmentally friendly: The safe characteristics meet modern-day environmental protection requirements.

Aspects impacting the thermal conductivity of AlN ceramics

Although the academic thermal conductivity of AlN is extremely high, its performance in practical applications is limited by numerous factors, generally including:

1. Microstructure: Phonon spreading is the vital device of warm transmission. Grain borders, user interfaces, 2nd phases, flaws, etc, will certainly influence the mean totally free path of phonons, thereby impacting thermal conductivity. High-purity, low-defect single-crystal AlN has a much longer phonon-free path and greater thermal conductivity.

2. Oxygen impurity content: The solid affinity of AlN with oxygen makes it easy to introduce oxygen impurities, developing aluminum oxide movies and latticework issues, such as light weight aluminum jobs, which substantially reduce the mean complimentary path of phonons and therefore lower thermal conductivity. When the oxygen focus is below 0.75%, oxygen atoms primarily change nitrogen atoms; surpassing this focus will certainly bring about the disappearance of aluminum openings and the generation of ductility issues, even more influencing thermal conductivity.

3. Sintering procedure and ingredients: By choosing appropriate sintering ingredients (such as Y2O3-Li2O, Y2O3-CaC2 and various other composite systems), densification sintering can be accomplished at a lower temperature level while reducing the development of oxygen pollutants and 2nd stages, effectively improving the thermal conductivity of AlN ceramics. The duty of these additives is to detoxify the grain boundaries, optimize the microstructure, and assist in the reliable transmission of phonons.

Comprehensive method

In order to acquire AlN porcelains with high thermal conductivity, it is needed to take into consideration the purity of the product adequately, the sintering problems and the option of additives to decrease internal flaws, especially to control the content of oxygen contaminations and optimize the microstructure.

By carefully managing the sintering process and taking on an effective composite sintering additive system, it is anticipated that the high thermal conductivity AlN substrate needed for massive manufacturing applications can be attained while making certain product efficiency. This is not just essential for boosting the heat dissipation performance of digital devices, but additionally gives a crucial product basis for promoting 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 thermal conductivity, please feel free to contact us and send an inquiry.

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