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

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Light weight aluminum nitride (AlN), as a structurally secure hexagonal wurtzite covalently adhered compound, has shown vast application capacity 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 fundamental device, with area group P63mc coming from the hexagonal crystal system. This framework gives AlN a collection of exceptional properties.

Highlight of AlN porcelains

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

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

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

Convenient for multi-layer circuitry: supports miniaturization and high-density assimilation of packaging.

Environmentally friendly: The safe characteristics fulfill modern environmental protection needs.

Aspects affecting the thermal conductivity of AlN porcelains

Although the theoretical thermal conductivity of AlN is very high, its performance in functional applications is limited by lots of variables, generally consisting of:

1. Microstructure: Phonon scattering is the vital mechanism of warmth conduction. Grain limits, user interfaces, 2nd phases, problems, etc, will certainly affect the mean cost-free course of phonons, thereby affecting thermal conductivity. High-purity, low-defect single-crystal AlN has a longer phonon-free course and higher thermal conductivity.

2. Oxygen contamination web content: The strong fondness of AlN with oxygen makes it easy to introduce oxygen contaminations, forming aluminum oxide movies and lattice defects, such as light weight aluminum vacancies, which considerably decrease the mean free course of phonons and therefore minimize thermal conductivity. When the oxygen concentration is listed below 0.75%, oxygen atoms generally change nitrogen atoms; exceeding this concentration will result in the loss of light weight aluminum jobs and the generation of ductility problems, even more influencing thermal conductivity.

3. Sintering procedure and additives: By choosing proper sintering ingredients (such as Y2O3-Li2O, Y2O3-CaC2 and other composite systems), densification sintering can be attained at a reduced temperature while decreasing the development of oxygen impurities and 2nd phases, properly boosting the thermal conductivity of AlN porcelains. The role of these additives is to detoxify the grain boundaries, optimize the microstructure, and promote the effective transmission of phonons.

Comprehensive method

In order to obtain AlN ceramics with high thermal conductivity, it is needed to think about the pureness of the product adequately, the sintering conditions and the selection of additives to reduce internal flaws, particularly to regulate the content of oxygen contaminations and optimize the microstructure.

By finely controlling the sintering process and taking on an efficient composite sintering additive system, it is expected that the high thermal conductivity AlN substratum required for large manufacturing applications can be accomplished while making certain product efficiency. This is not only essential for improving the warm dissipation performance of digital devices, yet additionally gives an essential material basis for promoting the growth of semiconductor technology.

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 aluminium nitride price, please feel free to contact us and send an inquiry.

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