High-grade AlN powder is the cornerstone of the aluminum nitride industry, characterized by low oxygen content, high specific surface area, narrow particle size distribution, excellent sintering activity, and moisture resistance.
Oxygen Content in Powder
This is a critical indicator for high-grade AlN powder. The oxygen in AlN primarily comes from surface-adsorbed oxygen, existing as a mixture of Al₂O₃ and AlOOH coating the powder particles. During sintering, oxygen easily diffuses into the AlN lattice, forming structural defects such as aluminum vacancies. These defects scatter phonons, reducing their mean free path and ultimately degrading the material's thermal conductivity.
Specific Surface Area & Particle Size Distribution
Generally, as particle size decreases and specific surface area increases, the powder's surface energy rises, enhancing its reactivity and sintering driving force. The specific surface area, dispersibility, particle size, and distribution are key factors determining densification and the final performance of sintered products.
Other Impurities & Their Content
Besides oxygen, other impurities can dissolve into the AlN lattice, introducing defects that further reduce thermal conductivity.
Moisture Resistance
AlN powder is prone to hydrolysis in humid air, reacting with water vapor to form Al(OH)₃ and NH₃, as shown in Equation (1). The loose byproducts fail to protect the powder, leading to continuous oxidation and even deterioration. Therefore, AlN powder must be stored in a dry, sealed environment. To improve storage, transportation, and usability, surface modification can enhance its hydrolysis resistance.
AlN + 3H₂O → Al(OH)₃ + NH₃ (1)
Conclusion
With the advancement of semiconductors, aerospace, new energy, and 5G communications, thermal management in high-power and high-heat-flux devices has become a major challenge affecting performance and reliability. As a high-performance thermal conductive material, AlN is gaining broader applications.
About Xiamen Juci Technology Co., LTD
Xiamen Juci Technology Co., Ltd. is China's leading manufacturer of aluminum nitride (AlN) powder by production volume. Our high-purity aluminum nitride powder and customized AlN ceramic products deliver superior thermal conductivity and cost-effective performance, making them ideal for advanced thermal management applications.
We specialize in innovative thermal solutions tailored for industries such as 5G communications, semiconductors, new energy, and aerospace, helping clients achieve optimal heat dissipation and system reliability.
Media Contact:
Xiamen Juci Technology Co., Ltd.
Phone: +86 592 7080230
Email: miki_huang@chinajuci.com
Website: www.jucialnglobal.com
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Email : chenxiaofang@chinajuci.com
Tel : +8618250812806
