Armoring Aluminum Nitride: How Moisture-Resistant Technology Expands Application Boundaries

Aluminum Nitride (AlN) micron powder has become a star material for high-end thermal conductive fillers due to its exceptional thermal conductivity. However, AlN faces an inherent challenge: it is prone to hydrolysis in humid environments (AlN + 3H₂O → Al(OH)₃ + NH₃↑). The resulting aluminum hydroxide exhibits a drastic drop in thermal conductivity; coupled with volume expansion and ammonia release, this can lead to a surge in interfacial thermal resistance and potential device corrosion. This has historically been the "Achilles' heel" limiting the large-scale application of AlN fillers.

The industry's mainstream solution is AlN surface modification, which constructs a protective layer to significantly delay the hydrolysis process:

Organic Coating (e.g., Silane Coupling Agents):​

Building a hydrophobic molecular layer on the AlN particle surface—acting like a "waterproof raincoat"—reduces surface energy and water molecule adsorption. This simultaneously enhances the dispersion and compatibility of the filler within matrices such as silicone oil and epoxy resin.

Inorganic Coating (Phosphates/Borates, etc.):​

Forming a dense, glass-like barrier layer (e.g., aluminum phosphate) on the particle surface, offering superior resistance to high temperatures and humidity.

Hybrid Coating:​

Combining the advantages of organic and inorganic treatments, this represents the current mainstream direction for high-end Moisture-resistant AlN Treatment. It can extend the hydrolysis induction period by several times to tens of times under specified operating conditions.

Optimized, moisture-resistant AlN fillers can now be stably applied across various Thermal Interface Materials (TIMs):

AlN filler for thermal grease: Leveraging the synergy between the hydrophobic nature of silicone oil and the protective coating to control NH₃ release.

AlN filler for thermal gel / AlN filler for thermal pad: Relying on high-grade anti-hydrolysis treatments to ensure long-term reliability within silicone rubber matrices.

For applications demanding service lives exceeding ten years—such as New Energy Vehicle (NEV) electronic control systems and outdoor PV inverters—selecting fillers that have undergone rigorous AlN surface modification and Moisture-resistant AlN Treatment is critical. Ensuring long-term system reliability requires validating performance against the industry-standard 85°C/85% RH accelerated aging test to project real-world lifespan.

Xiamen Juci specializes in manufacturing High Purity AlN Powder, AlN Granule, Thermal Conductive Filler, and AlN Ceramics—products that have earned consistent recognition and positive feedback from customers worldwide. Should you have any requirements, please do not hesitate to contact us.

Contact: Jenny Qin / 진현혜 

Phone: +86 151-5177-8700

Wechat ID: JENNY-8866

Xiamen Juci Technology Co., Ltd.

Email: qinxianhui@chinajuci.com

Website: www.jucialnglobal.com