Method for preparing homogeneous multi-core superconducting materials
A superconducting material, uniform technology, applied in the field of preparation of uniform multi-core superconducting materials, can solve the problems of uneven mechanical properties, core wire dislocation, large changes, etc., to achieve uniform mechanical properties of products, small changes in extrusion force, The effect of saving extrusion force
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[0018] The preparation method of the uniform multi-core superconducting material of the present invention is specifically carried out according to the following steps:
[0019] step 1,
[0020] Take multiple NbTi / Cu, or Nb / Cu, or NbTa / Cu single-core superconducting composite rods with a diameter of 1-30mm as the extruded raw material, and load them with a diameter of Φ100-Φ300mm and a length of 500-900mm. The oxygen-free copper tube with a thickness of 10-35mm is sealed and welded by vacuum ion beam at both ends to obtain a multi-core composite ingot;
[0021] Step 2,
[0022] Put the multi-core composite ingot obtained in step 1 into a hot isostatic pressing device, select a temperature of 300-700°C, a holding pressure of 100-150MPa, and a holding time of 60-180min for processing, and then cool it with the furnace to Baked at 50°C to obtain a highly dense multi-core composite ingot;
[0023] Step 3,
[0024] Heat the high-density multi-core composite ingot obtained in ste...
Embodiment 1
[0029] NbTi / Cu single-core superconducting composite rods with an opposite side size of 1 mm are bundled and packed into an oxygen-free copper tube with a diameter of Φ100, a length of 500 mm, and a wall thickness of 10 mm. The two ends of the oxygen-free copper tube are vacuum electron beams Carry out sealing welding. The billet after welding is hot isostatic pressed at a temperature of 500°C and a pressure of 110MPa. After holding the pressure for 120 minutes, it is cooled with the furnace, and the ingot is released from the furnace when it drops to 50°C. Then heat the ingot to 600°C in an induction furnace, hold it for 40 minutes, and then extrude it with a reverse extrusion machine. The extrusion ratio is 8, the diameter of the extrusion die is Φ75, the extrusion speed is 20mm / s, and it is lubricated with lubricant Between the billet and the extrusion die, after the extrusion is completed, the extruded rod is stretched on a stretching machine, the stretching speed is 30m / ...
Embodiment 2
[0032] Nb / Cu single-core superconducting composite rods with an opposite side size of 30mm are bundled and packed into an oxygen-free copper tube with a diameter of Φ300, a length of 900mm, and a wall thickness of 35mm. The two ends of the oxygen-free copper tube are vacuum electron beams Carry out sealing welding. The billet after welding is hot isostatic pressed at a temperature of 600°C and a pressure of 120MPa. After holding the pressure for 150 minutes, it is cooled with the furnace, and the ingot is released from the furnace when it drops to 50°C. Then heat the ingot to 700°C in an induction furnace, keep it warm for 45 minutes, and then extrude it with a reverse extrusion machine. The extrusion ratio is 12, the diameter of the extrusion die is Φ30, the extrusion speed is 10mm / s, and lubricated with lubricant Between the billet and the extrusion die, after the extrusion is completed, the extruded rod is stretched on a stretching machine, the stretching speed is 5m / min, ...
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