Development of Y-Ba-Cu-0 Superconductors For Magnetic Bearings

The material requirements, material manufacturing and magnetic properties that are relevant to fabrication of High Temperature Superconductor (HTS) magnetic bearings have been discussed. It is found that the seeded-melt-texturing method can be used to fabricate the single domain material that is required to achieve the best magnetic properties. Trapped-field mapping has been used as a non destructive tool to determine the single-domain nature of the HTS material and quantify the quality of the HTS disks. Both the trapped field and the levitation force of the Y-Ba-Cu-0 disks are found to be strongly sensitive to the oxygen content.