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Frictional properties of structural steel JN2 at cryogenic temperatures in a vacuum.

Author(s) : IWABUCHI A., IIDA S., YOSHINO Y., SHIMIZU T., SUGIMOTO M., NAKAJIMA H., YOSHIDA K.

Type of article: Article

Summary

To assess the frictional properties at the wedge of a toroidal field coil of a tokamak fusion reactor, friction tests were conducted using structural steel, JN2, against various materials in a vacuum at low temperatures under a normal load of 10 N and a peak-to-peak sliding amplitude of 100 micrometers. The temperature was mainly about 5 K and the ambient pressure about 0,001 pascal. The relationship between the frictional characteristics and the number of cycles depends on both the material combination and temperature. Two typical patterns of behaviour were observed at 5 K depending on the combination; fairly constant friction and very high and fluctuating friction. The high friction was caused by severe adhesion between surfaces. Temperature dependence of friction was also observed for JN2-copper.

Details

  • Original title: Frictional properties of structural steel JN2 at cryogenic temperatures in a vacuum.
  • Record ID : 1994-3342
  • Languages: English
  • Source: Cryogenics - vol. 33 - n. 12
  • Publication date: 1993/12

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