Yttrium Oxide "Chokehold" Opens Historic Window for High-End Aluminum Nitride

The most underestimated link in the AI computing power chain is not GPUs or optical modules, but the high-end aluminum nitride (AlN) ceramic​ hidden beneath them. AlN achieves a thermal conductivity of 170–230 W/(m·K), making it essential for heat dissipation in optical modules, HBM memory, and electrostatic chucks (ESC) used in wafer etching equipment.

Yttrium oxide (Y₂O₃) is not a component of AlN, but rather the "key" that must be added during the sintering process. The typical addition amount ranges from 0.5% to 5% (with the mainstream formulation at about 3%). Since the surface of AlN powder is highly susceptible to oxidation, forming an aluminum oxide hard shell that severely impedes heat conduction, Y₂O₃ reacts with this layer at temperatures above 1600°C to form yttrium aluminate grain boundary phases such as YAG. Through liquid-phase sintering, it densifies AlN to a relative density exceeding 99.2% while capturing grain-boundary oxygen to preserve high thermal conductivity. Without this 3%–5% of yttrium oxide, the sintered product is rendered a ceramic with extremely poor thermal conductivity.

China holds a dominant position in global rare earth smelting and separation capacity (approximately 70%–90%), and the supply of yttrium oxide is heavily dependent on Chinese exports. Following the tightening of export controls in recent years, overseas yttrium oxide prices have skyrocketed. Some overseas high-end ceramic production lines faced Y₂O₃ inventories sufficient for only 10–15 days, forcing them to cut high-end AlN substrate/HTCC capacity by 25%–30%, with lead times extending from the usual 8–12 weeks to over 20–24 weeks. This disruption has directly created a rare validation window for domestic AlN powder producers. Downstream tier-1 customers, in order to secure supply chain stability, are accelerating the qualification of domestic AlN materials​ at an unprecedented pace, compressing the validation cycle from over 18 months to within 10 months.

      Against this backdrop, domestic high-quality aluminum nitride products​ are rapidly extending from powders to device-level applications. Currently, the localization rate for high-end AlN powder remains only about 4%–10%, but the localization rate for high-end AlN ceramic substrates​ has increased from below 15% in 2024 to approximately 28%–30% in 2026, while localization in the mid-to-low-end segment has already exceeded 50%. Among these, AlN ceramic substrates​ have achieved mass adoption in 800G/1.6T high-end optical modules, becoming the mainstream solution for thermal dissipation demands. Meanwhile, AlN for electrostatic chuck (ESC) insulation layers​ has entered accelerated validation in high-end semiconductor etching equipment.

For Xiamen JUCI, our current annual AlN powder capacity of 700 tons—expanding to 1,200 tons by year-end—is precisely positioned to capture this wave of full-chain substitution demand, from powders to ceramic components. We are committed to providing downstream customers with "uninterrupted supply, premium quality, and customizable" AlN total solutions amid this global supply chain restructuring. Leveraging stable capacity as our foundation, we aim to seize this historic opportunity in the computing era together with our industry partners.

      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