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VACUUM ›› 2024, Vol. 61 ›› Issue (4): 80-84.doi: 10.13385/j.cnki.vacuum.2024.04.15

• Measurement and Control • Previous Articles     Next Articles

Test of Outgassing Rates of Threaded Fasteners with Copper Anti-seize Coating

MAO Xin1,2, FENG Si-qing1,2,3, LIU Peng1, PENG Xue-bing1, WU Huan1   

  1. 1. Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
    2. University of Science and Technology of China, Hefei 230026, China;
    3. Hefei Key Electrical Physical Equipment Manufacturing Co., Ltd., Hefei 230088, China
  • Received:2023-11-10 Online:2024-07-25 Published:2024-07-29

Abstract: Copper coating is one of the main means to solve the anti-seize problem of threaded fasteners in vacuum vessel during the running of fusion reactor. This work briefly introduces the coating copper procedure and the solution to pitting-attacks on the copper coating. Meanwhile, to satisfy the high vacuum requirement, the orifice conductance method was used to test the outgassing rates of threaded fasteners with copper coating. The impact of copper coating, environmental temperature, and other factors on the material outgassing rate was analyzed in detail. The results show that the desorption gas is composed of hydrogen, water, nitrogen, CO2, and the contained hydrogen rate does not meet the relevant requirements. This is bound up with coating copper process, test environment, test time and so on. It is necessary to control the test influential factors to achieve the anticipated outgassing rate requirements of material in vacuum vessel of fusion reactor.

Key words: standard threaded fastener, seizing, copper coating, outgassing rate

CLC Number:  TB74

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