Frictional heating of magnet structural materials at cryogenic temperatures

✍ Scribed by A. Iwabuchi; K. Komuro

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 566 KB
• Volume: 31
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(91)90221-h

✦ Synopsis

One of the causes of quench in a superconducting magnet is frictional heat. The properties of the frictional force and the frictional heat of magnet structural materials were investigated at 4.2 K in liquid helium. The relationship between temperature rise, measured with a thermocouple, and frictional heat has been discussed. The coefficient of friction varied with the change in frictional variables such as normal load, sliding distance and surface roughness, even for the same material combination. When slip was repeated, a heat pulse occurred due to alternate stick and slip during sliding, and a peak in the temperature rise appeared, corresponding to the heat pulse. The temperature rise was insensitive to the small change in frictional heat in the pulse. The first peak in the temperature rise, which was associated with the temperature rise due to friction in the magnet, was not related to the frictional heat, Fv, directly but to a function of Fv 3/4, where F is the frictional force and v the sliding velocity.