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VACUUM ›› 2025, Vol. 62 ›› Issue (5): 17-22.doi: 10.13385/j.cnki.vacuum.2025.05.03

• Measurement and Control • Previous Articles     Next Articles

Study on the Outgassing Performance of Graphite/Copper Composite

TAN Biao1,2, YU Jiebing1,2,3, WANG Pengcheng1,2,4, LI Yanmin5, LIU Jiaming1,2, LIU Shunming1,2, GUAN Yuhui1,2, SUN Xiaoyang1,2, WANG Yigang1,2, ZHU Bangle1,2   

  1. 1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    2. Spallation Neutron Source Science Center, Dongguan 523808, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. University of Science and Technology of China, Hefei 230029, China;
    5. Beijng Gangyan Diamond Products Company Carbide Branch, Beijing 102200, China
  • Received:2024-12-25 Published:2025-09-29

Abstract: To expand the application of graphite/copper composites in accelerators, powder metallurgy technology was used to prepare different doped graphite/copper composites. The effects of graphite content and doping elements on the relative density and outgassing rate of the composites were studied. The possibility of their application in beam collimators was evaluated. The results show that the relative density of undoped graphite/copper and nickel-coated flake graphite/copper composites is higher than 95%, while the relative density of other doped composites decreases with the increase of graphite content. The nickel-coated flake graphite/copper composites with graphite content of 30% show the lowest outgassing rate. A bake-out procedure can effectively reduce the degassing rate of composite materials. By combining an optimised fabrication route with a stringent bake-out protocol, the outgassing rate can be suppressed sufficiently to qualify Gr/Cu composites as collimator materials for the China Spallation Neutron Source accelerator.

Key words: graphite/copper composite, outgassing rate, residual gas analysis, relative density

CLC Number:  TB79;TB741

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