我国制备出“人造太阳”关键核心材料

Core Insights - China has made significant progress in the field of key materials for controllable nuclear fusion, successfully producing the second-generation high-temperature superconducting tape core material, Hastelloy C276, which breaks the long-standing reliance on imports [1][2] Group 1: Material Development - The research team achieved industrial-scale production of high-purity C276 alloy using a self-developed purification technology, with impurity levels of sulfur and phosphorus lower than imported products [2] - The team overcame technical challenges to process ultra-thin and ultra-long substrates, producing a strip material with a thickness of only 0.046 mm, a width of 12 mm, and a length exceeding 2000 meters, with a surface roughness of less than 20 nanometers [2] Group 2: Performance and Applications - The newly developed C276 material exhibits exceptional strength at liquid nitrogen temperatures, capable of supporting approximately 19 tons of weight over an area the size of a fingernail, and retains excellent performance even after high-temperature treatment [2] - The C276 has been validated by multiple enterprises and has successfully produced high-temperature superconducting tapes that meet international standards, contributing to domestic technology projects [2] Group 3: Future Collaborations - A framework cooperation agreement has been established with Eastern Superconducting Technology (Suzhou) Co., Ltd. for the supply of 20 tons of C276 substrates, with plans to further optimize production processes and promote the large-scale application of domestic substrates [2]