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Preparation method of MgB2 superconducting magnetic shielding device working at 20K
The invention discloses a preparation method of an MgB2 superconducting magnetic shielding device working at 20K. The preparation method comprises the steps that an MgB2 superconducting block material is smashed and is fully ground, a die is utilized to press the material into a required shape, and thus a shielding device precursor is obtained; after 700-750 DEG C sintering, borohydride magnesium sol gel liquid is placed into the shielding device precursor, and is uniformly attached to the inner wall of the device by a spinning machine; and after 450-500 DEG C thermal processing, the borohydride magnesium sol gel liquid is subjected to dehydrogenation to form an MgB2 superconducting film with a compact structure, and the MgB2 superconducting film is closely attached to the inner wall of the shielding device, thereby obtaining the MgB2 superconducting magnetic shielding device. According to the invention, a powder sintering method and a sol gel method are combined to manufacture the high-performance MgB2 superconducting magnetic shielding device of which the working temperature is 20 K (253 DEG C below zero), and the operation requirement of an MgB2 superconducting quantum interference device can be met.
Preparation method of MgB2 superconducting magnetic shielding device working at 20K
The invention discloses a preparation method of an MgB2 superconducting magnetic shielding device working at 20K. The preparation method comprises the steps that an MgB2 superconducting block material is smashed and is fully ground, a die is utilized to press the material into a required shape, and thus a shielding device precursor is obtained; after 700-750 DEG C sintering, borohydride magnesium sol gel liquid is placed into the shielding device precursor, and is uniformly attached to the inner wall of the device by a spinning machine; and after 450-500 DEG C thermal processing, the borohydride magnesium sol gel liquid is subjected to dehydrogenation to form an MgB2 superconducting film with a compact structure, and the MgB2 superconducting film is closely attached to the inner wall of the shielding device, thereby obtaining the MgB2 superconducting magnetic shielding device. According to the invention, a powder sintering method and a sol gel method are combined to manufacture the high-performance MgB2 superconducting magnetic shielding device of which the working temperature is 20 K (253 DEG C below zero), and the operation requirement of an MgB2 superconducting quantum interference device can be met.
Preparation method of MgB2 superconducting magnetic shielding device working at 20K
FENG QINGRONG (author)
2015-09-30
Patent
Electronic Resource
English
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