Preparation method of uniform multi-core superconducting material

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 small extrusion residue

Active Publication Date: 2011-12-07
西部超导材料科技股份有限公司
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  • Abstract
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Problems solved by technology

Usually, the filling factor of multi-core superconducting materials is less than 96%, which can easily cause dislocation of core wires in the extrusion process and can not be uniformly deformed, thereby affecting the mechanical properties of superconducting materials.
Moreover, the traditional method of preparing multi-core superconducting materials is the forward extrusion method, that is, during extrusion, the direction in which the metal material flows out of the die hole is the same as the direction in which the extrusion force is applied. The friction force between the composite billet and the extrusion cylinder is only 60-70% of the effective extrusion force, and the extrusion force varies greatly from large to small during the whole process from the beginning to the end of extrusion, and the extrusion force The change of the mold makes the deformation of the mold large, and the size of the head and tail of the extruded product changes greatly, which will also cause the mechanical properties of the product to be uneven and the performance is low.

Method used

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preparation example Construction

[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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Abstract

The invention discloses a method for preparing homogeneous multi-core superconducting materials. The method comprises: taking a plurality of single-core superconducting composite rods as raw materials for extrusion; placing the raw materials into an oxygen-free copper tube; adopting vacuum ion beams to seal and weld two ends of the oxygen-free copper tube; putting the oxygen-free copper tube into hot isostatic pressing equipment for treatment; cooling the oxygen-free copper tube with a furnace to 50 DEG C; taking the obtained product out of the furnace; obtaining a high-compactness multi-core billet; heating the billet to between 550 and 750 DEG C in an induction furnace; preserving heat for 30 to 150 minutes and then extruding the obtained product with an extruder; selecting a mixture of graphite and cylinder oil as lubricant between the billet and an extrusion die; finishing extrusion and then obtaining a multi-core extrusion rod which is phi 40 to 80 mm in diameter; and stretching the multi-core extrusion rod on a stretcher repeatedly till a multi-core superconducting material meeting requirements for diameter is obtained. The method for preparing homogeneous multi-core superconducting materials has the advantages of adopting a hot isostatic pressing process and a backward extrusion process and ensuring uniform mechanical properties of obtained products.

Description

technical field [0001] The invention belongs to the technical field of superconducting material processing, and relates to a preparation method of a uniform multi-core superconducting material. Background technique [0002] For multi-core superconducting materials, several superconducting composite rods are usually bundled and filled into an oxygen-free copper tube, then capped and welded, and then extruded and stretched to obtain a finished superconducting wire. Usually, the filling factor of the multi-core superconducting material is less than 96%, which easily causes dislocation of the core filaments in the extrusion process and cannot be uniformly deformed, thereby affecting the mechanical properties of the superconducting material. Moreover, the traditional method of preparing multi-core superconducting materials is the forward extrusion method, that is, during extrusion, the direction in which the metal material flows out of the die hole is the same as the direction in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/00H01B12/10
CPCY02E40/644Y02E40/60
Inventor 李建峰张平祥刘向宏冯勇刘维涛王天成朱思华严凌霄高慧贤
Owner 西部超导材料科技股份有限公司
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