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

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

Aluminum nitride (AlN), as a structurally stable hexagonal wurtzite covalently bonded substance, has shown vast application potential in the areas of electronics and optoelectronics as a result of its special physical and chemical residential properties. Its crystal structure is based upon an AlN4 tetrahedron as the basic device, with room group P63mc belonging to the hexagonal crystal system. This structure provides AlN a collection of excellent homes.

Highlight of AlN porcelains

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

Thermal growth matching: Its thermal expansion coefficient resembles that of semiconductor silicon products, which is conducive to tool integration.

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

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

Eco-friendly: The safe attributes fulfill modern-day environmental protection requirements.

(Aluminum Nitride (AlN) Crystal Structure)
Factors influencing the thermal conductivity of AlN ceramics

Although the academic thermal conductivity of AlN is extremely high, its performance in sensible applications is limited by several factors, primarily consisting of:

1. Microstructure: Phonon scattering is the vital device of warmth conduction. Grain borders, user interfaces, second phases, problems, etc, 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 greater thermal conductivity.

2. Oxygen contamination content: The solid affinity of AlN with oxygen makes it simple to present oxygen pollutants, creating aluminum oxide movies and lattice defects, such as aluminum jobs, which dramatically decrease the mean cost-free path of phonons and therefore reduce thermal conductivity. When the oxygen concentration is below 0.75%, oxygen atoms primarily change nitrogen atoms; exceeding this focus will certainly result in the disappearance of light weight aluminum openings and the generation of ductility issues, even more impacting thermal conductivity.

3. Sintering process and additives: By selecting ideal sintering additives (such as Y2O3-Li2O, Y2O3-CaC2 and various other composite systems), densification sintering can be achieved at a lower temperature level while lowering the development of oxygen contaminations and second stages, efficiently boosting the thermal conductivity of AlN ceramics. The function of these ingredients is to purify the grain borders, maximize the microstructure, and assist in the efficient transmission of phonons.

Comprehensive technique

(TRUNNANO Aluminum Nitride (AlN) Powder)

In order to get AlN ceramics with high thermal conductivity, it is essential to think about the purity of the material comprehensively, the sintering conditions and the choice of additives to decrease inner problems, especially to control the material of oxygen impurities 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 substratum required for large manufacturing applications can be accomplished while ensuring product efficiency. This is not just crucial for improving the warmth dissipation efficiency of digital gadgets, but additionally offers a crucial material basis for promoting the advancement of semiconductor innovation.

Supplier 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

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