Bobbin for superconducting coils
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United States of America Patent
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Nov 4, 1997
Grant Date -
N/A
app pub date -
Apr 12, 1996
filing date -
Apr 24, 1995
priority date (Note) -
Expired
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Abstract
A bobbin for superconducting coils, which is made of a fiber-reinforced plastic material containing: (1) a matrix resin; (2) a polyethylene fiber having a negative thermal expansion coefficient in the fiber lengthwise direction, the angle between the polyethylene fiber and the longitudinal axis of the bobbin being in the range of .+-.35.degree. to 90.degree.; and (3) a substance having an elastic modulus higher than that of the polyethylene fiber. The bobbin of the present invention is useful for superconducting coils because it only exhibits a quite low degree of deformation, even when used under external stress at cryogenic temperatures.
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