US aerospace and semiconductor suppliers are confronting an acute shortage of critical rare earths that has already forced at least two North American firms to refuse or ration customer orders. The squeeze is focused on yttrium and scandium, niche members of the 17‑element rare‑earth family that play outsized roles in engine coatings, advanced alloys and next‑generation chip components.
Yttrium is essential to high‑temperature ceramic coatings that prevent turbine and engine parts from melting; without regular application these engines cannot operate. Scandium, produced in global quantities measured in only tens of tonnes a year, is prized for fuel cells, specialty aluminum alloys and advanced chip packaging used widely in 5G smartphones and base stations.
The supply bottleneck has tangible commercial effects. Some coating manufacturers have begun material rationing, and two North American coating companies have either paused production or prioritized large domestic engine manufacturers over smaller and overseas customers. Engine makers are already stretched responding to airlines' demand for spare parts and to the higher production targets of planebuilders such as Boeing and Airbus.
Market pressures are steep. Yttrium prices have jumped about 60 percent since November and, by one set of industry figures cited by insiders, are roughly 69 times their level a year ago. SemiAnalysis founder Dylan Patel warns that US semiconductor firms depend on scandium for components used in virtually every 5G handset and base station, and that domestic scandium production is effectively zero; existing inventories are likely sufficient for months rather than years.
The structural driver is geographic concentration: almost all production of these specific rare earths is located in China, leaving US firms reliant on a single external source and vulnerable to market dislocations. The immediate result is disrupted supply chains, higher input costs, and an incentive for manufacturers and governments to consider stockpiles, recycling and investment in alternative supplies — measures that will take time and capital to implement.
Editor's Take: The current squeeze on yttrium and scandium is a classic supply‑chain shock with strategic consequences. For defence and aerospace the risk is operational downtime and delayed deliveries; for the semiconductor sector it threatens the rollout and manufacturing of 5G‑era components. Policymakers face a choice between near‑term mitigation — strategic stockpiling, export diplomacy and targeted subsidies for refining — and long‑term industrial fixes such as new mining and processing capacity outside China, a transition that will take years and sustained political will. In the near term, expect further rationing, selective prioritization of key customers and flares of price volatility that will ripple through sectors dependent on these small but critical metals.