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Large single-grain bulk rare earth element (RE)-Ba-Cu-O superconductors can trap large fields exceeding several teslas and thus can function as very strong quasi-permanent magnets. however, the maximum trapped field is essentially limited by the mechanical strength of the bulk superconductors. The stress produced by refrigeration sometimes causes cracking. A large electromagnetic force also acts on superconductors when they trap large magnetic fields, and this occasionally leads to device failure. We have recently found that epoxy resin can penetrate into bulk superconductors under certain conditions. Microstructural observation revealed that microcracks as well as porosities can be impregnated with epoxy resin, which greatly improves the mechanical properties of bulk RE-Ba-Cu-O and thus results in the improvement of field trapping capability.

teion kougaku/teion kōgaku

Properties and Applications of Bulk High Temperature Superconductors. Improvement of the Mechanical Properties of Bulk Superconductors by the Impregnation of Epoxy Resins.