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

✍ Scribed by A. Iwabuchi; S. Iida; Y. Yoshino; T. Shimizu; M. Sugimoto; H. Nakajima; K. Yoshida

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 540 KB
Volume: 33
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(93)90003-7

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✦ Synopsis

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, J N2, against various materials in a vacuum at low temperatures under a normal load of 10 N and a peak-to-peak sliding amplitude of 1 00 #m. The temperature was mainly ~ 5 K and the ambient pressure ~ 10 -3 Pa. 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.

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