"Key core materials for the 'artificial sun' have achieved domestic industrial production."

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China has made significant progress in the field of key materials for controllable nuclear fusion. Reporters learned from the Institute of Metal Research, Chinese Academy of Sciences, on the 28th that researchers at the institute have successfully produced the core material for second-generation high-temperature superconducting tapes—Hastelloy (C276) metal substrate—breaking the longstanding reliance on imported materials. This marks an important step forward for China in the field of key materials for clean energy.

Kilometer-level substrate   Provided by the Institute of Metal Research, Chinese Academy of Sciences

Controllable nuclear fusion devices are known as "artificial suns" and are an important direction for humanity's exploration of future clean energy. Second-generation high-temperature superconducting tapes are indispensable core materials for building controllable nuclear fusion devices. Without them, it is impossible to generate a strong enough magnetic field to "confine" plasma at temperatures of hundreds of millions of degrees Celsius.

In this research, the team achieved ton-scale industrial production of high-purity C276 alloy using independently developed purification preparation technology. At the same time, the team overcame technical difficulties in processing ultra-thin, ultra-long substrate tapes, rolling the alloy into a strip material with a thickness of just 0.046 mm, a width of 12 mm, and a length of over 2,000 meters, with a mirror-like smooth surface and roughness of less than 20 nanometers. This material has extremely high strength at liquid nitrogen temperatures, equivalent to a fingernail-sized area being able to withstand about 19 tons in weight, and still maintains excellent properties after high-temperature treatment.

Currently, domestically produced C276 has been validated by numerous enterprises and has been successfully used to create high-temperature superconducting tapes with international-level performance, applied in related domestic science and technology projects.

Author: Lu Chengkuan, Source: Science and Technology Daily, Original title: "Ton-scale Industrial Preparation! Significant Progress in This Key Material in China"

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