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In order to study the vacuum cold welding effect of the spacecrafts’ pipeline disconnection in the mission of propellant in-orbit refueling, a method of coating the pipeline with perfluoropolyether based grease was proposed, which can effectively prevent vacuum cold welding and lubrication of the pipeline. Gray perfluoropolyether based greases containing trace amounts of molybdenum disulfide is incompatible with propellant (nitrous oxide and monomethylhydrazine), so it should not be used on the surface of pipeline in contact with propellant. During the in-orbit flight of Tianzhou-1 cargo spacecraft, the vacuum cold welding scheme described in this paper has been verified by three in-orbit refueling missions, showing the scheme can be extended to other spacecraft for in-orbit docking and service.

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Study on Vacuum Cold Welding Prevention of In-Orbit Refueling Pipeline Disconnection

  • 会议论文

  • 发表日期：

    2025年

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  • Weichen Wang,
  • Weizhen Pan,
  • Shengran Dong,
  • Jianyu Lei,
  • Sheng Yang

摘要

In order to study the vacuum cold welding effect of the spacecrafts’ pipeline disconnection in the mission of propellant in-orbit refueling, a method of coating the pipeline with perfluoropolyether based grease was proposed, which can effectively prevent vacuum cold welding and lubrication of the pipeline. Gray perfluoropolyether based greases containing trace amounts of molybdenum disulfide is incompatible with propellant (nitrous oxide and monomethylhydrazine), so it should not be used on the surface of pipeline in contact with propellant. During the in-orbit flight of Tianzhou-1 cargo spacecraft, the vacuum cold welding scheme described in this paper has been verified by three in-orbit refueling missions, showing the scheme can be extended to other spacecraft for in-orbit docking and service.