Low temperature thermal conductor

Abstract

A thermal conductor material having excellent heat transfer properties by obtaining high thermal conductivity even at low temperature of, for example, a liquid nitrogen temperature (77 K) or lower is to provide. A thermal conductor to be used at low temperature of 77 K or lower in the magnetic field of a magnetic flux density of 1 T or more, includes aluminum which has a purity of 99.999% by mass or more and also has the content of iron of 1 ppm by mass or less.

1 . A thermal conductor to be used at low temperature of 77 K or lower in the magnetic field of a magnetic flux density of 1 T or more, comprising aluminum having a purity of 99.999% by mass or more and having the content of iron of 1 ppm by mass or less. 
     
     
         2 . The thermal conductor according to  claim 1 , wherein the aluminum has a purity of 99.9999% by mass or more. 
     
     
         3 . The thermal conductor according to  claim 1 , wherein the aluminum has a purity of 99.99998% by mass or more. 
     
     
         4 . The thermal conductor according to  claim 1 , wherein the aluminum contains an intermetallic compound Al 3  Fe. 
     
     
         5 . A thermal conductor for cooling a superconducting magnet, using the thermal conductor according to  claim 1 .