America's Hidden Coatings Crisis: How a Few Kilograms of Rare Minerals Could Threaten AI Chips and Defense

Highlights

• Yttrium-based coatings protect semiconductor equipment from plasma damage, but switching suppliers can take 6–18 months of qualification testing.
• China's advantage extends beyond mining to decades of processing expertise, creating a Transition Vulnerability Window Western nations cannot close quickly.
• REEx recommends stockpiling factory-ready materials, funding shared testing facilities, and securing long-term purchase agreements for small rare-earth markets like terbium and erbium.
• Gallium, germanium, terbium, and dysprosium face the same bottleneck: raw minerals are useless until converted into tested, approved industrial materials.
• A new supply-security metric is proposed: how many critical products have at least two independently approved suppliers, not just domestic mining output.