MELT-TEXTURED SUPERCONDUCTORS

for magnetic bearing, trapped field magnets

The standard form of our bulk HTS is cylinders and bars (see Standard Geomertry). Bespoke geometries and shapes, e.g. segments, rings, squares, are possible upon customer needs.

Y-Ba-Cu-O / Geometry Parameter Metrics T (K) Conditions
1.5-6.0×104 A/cm2 77 K
Critical current density 1.0-3.0×105 A/cm2 4.2 K Magnetization measurements in self-field
Ø30 mm cylinder Levitation force 90 N 77 K Standard NdFeB magnet

Ø25mm*20 mm

B=0.4 T (at surface)

Maximum trapped field 1.2 T 77 K 1.4 T field cooling magnetization (FC)
Ø30 mm mini-magnet 16.9 T 30 K 18 T FC
Ø30 mm ring x Ø6 mm 9.8 T 25 K 10 T FC
Cylinder Bar
Diameter (mm) Thickness (mm) Length x Width (mm2) Comment
30 >13 40×40 > 10-13 1-seed
33 >13 66×33 > 10-12 3-seed
40 >13 80×40 > 12 3-seed
45 >13
55 >13
Property Metric Comment
Transition temperature 90-92 K
Resistivity 0.6-0.7 mOhm/cm at 300 K
Density 6.38 g/cm3 theoretical
5.95 g/cm3 experimental (93 %)
Specific heat 0.43 Ws/gK at 300 K
Heat conductivity 4-8 W/mK average
Linear expansion 5-12 x10-6 1/K
Tensile strength 25-30 MPa

BULK HTS MASS PRODUCTION

SPECIAL SEEDING TECHNIQUE

Besides of large and multi-grain production, ATZ GmbH achieved special melt-textured techniques

  • Axial and radial ring seeding

  • Double seeding (top-bottom)

BULK MACHINING

  • High-quality
  • High precision ~ 0,1 mm
  • Reinforcement for high trapped field

  • Complex shape and form