Results on an established batch process preparing melt-texturedYBCO in high quality and quantity will be reported. We used a standardcomposition Y1.5Ba2Cu3O 7-X + 1wt.% CeO2 without further doping tofabricate single domain YBCO monoliths in different size and shape(cylindrical, quadratic) as well as rectangular multi-seeded YBCO monoliths.Up to 2-3 kg melt-textured YBCO blocks are grown reproducible in one boxfurnace run. Top seeding by self-made SmBCO was improved andrationalised. Optimisation of oxygen annealing treatment leads to macro-crackfree YBCO monoliths. Each YBCO monolith was characterised by integralleviation force and field mapping. In a single domain quadratic monolith with aedge length of 38 mm a maximum induction of 1.44 T at 77 K and a distanceof 0.5 mm was frozen. The reproducibility of batch process is guaranteed.Mean maximum induction from 1.1 to 1.2 T at 77 K per batch was reached. Atrapped magnetic field of 2.5 T was achieved between two single domainmonoliths in a gap of 1.5 mm at 77 K. Depending on the application functionelements with different sizes, designs and more or less complex geometry areconstructed in several working steps by cutting, machining, bonding andpassivation. Selected function elements were checked with field mapping at 77K. Results of our function elements in HTSC reluctance motors with an outputpower up to 200 kW using single domain material are shown. We will reportabout a fly wheel system DYNASTORE and a system to levitate persons.
展开▼
