Casting manufacturing method of superconducting NbTi alloy

A manufacturing method and alloy technology, which are applied in the field of casting and manufacturing of superconducting NbTi alloys, can solve the problems of inhomogeneity of NbTi superconducting alloy ingots, unfavorable NbTi alloy superconducting materials, affecting the cold working plasticity of superconducting materials, and the like, and achieving less interstitial elements. , good plasticity, high uniformity

Inactive Publication Date: 2012-09-12
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, in the international arena, the preparation method of NbTi superconducting alloy uses niobium powder and titanium fine particles as raw materials to prepare consumable electrodes, also uses niobium plates and titanium plates to assemble electrodes, and uses niobium rods and titanium Electrodes are prepared by rod group welding. The electrodes made by these different methods are melted and cast in a vacuum consumable arc furnace for more than two times to obtain NbTi superconducting alloy ingots, which often have macroscopic inclusions such as impenetrable niobium and titanium spots. The inhomogeneity of the NbTi superconductor alloy ingot and the many interstitial element impurities affect the cold working plasticity of the superconducting material, and also have a serious impact on its superconducting current-carrying capacity
In addition, in the electrode preparation process of melting and casting NbTi superconducting alloy ingots at home and abroad, due to the complicated manufacturing process of raw materials such as niobium and titanium, the cycle is long, and the external pollution is large, the interstitial elements of the superconducting alloy increase and the plasticity deteriorates.
This is extremely unfavorable for the manufacture of thin-core, high current-carrying capacity NbTi alloy superconducting materials

Method used

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  • Casting manufacturing method of superconducting NbTi alloy
  • Casting manufacturing method of superconducting NbTi alloy

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Experimental program
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Effect test

Embodiment 1

[0013] Purified niobium ingots are used, forged into rods, and then turned to remove the surface contamination layer. The removal amount should not be less than 1mm. Take niobium rods of Ф86×1450mm, and press the sponge titanium into such figure 1 For the 8 semi-cylindrical tiles shown, the weight of a single tile is 7.72Kg, and the niobium rods and tiles are assembled and welded under the protection of argon, and the welding is required to be firm and smooth. The electrode is smelted for the first time in a vacuum consumable electric arc furnace, and the smelting power is 250kW. The primary ingot of the niobium-titanium superconducting alloy obtained after the first smelting is made into a niobium-titanium consumable electrode with a diameter of 220mm. The melting power of more than 300kW is remelted in a vacuum consumable furnace, and the melt is fully stirred to further homogenize the niobium and titanium, and obtain the secondary ingot of niobium and titanium alloy.

Embodiment 2

[0015] Purified niobium ingots are used, forged into rods, and turned to remove the surface contamination layer. The removal amount should not be less than 1mm. Take Ф80×1450mm niobium rods and press the sponge titanium into such figure 1 In the 8 semi-cylindrical tiles shown, the weight of a single tile is 9.2Kg, and the niobium rods and tiles are assembled and welded under the protection of argon, and the welding is required to be firm and smooth. The electrode is smelted for the first time in a vacuum consumable electric arc furnace, and the smelting power is 230kW. The primary ingot of niobium-titanium superconducting alloy obtained after the first smelting is made into a niobium-titanium consumable electrode with a diameter of 220mm. The melting power of more than 300kW is remelted in a vacuum consumable furnace, and the melt is fully stirred to further homogenize the niobium and titanium, and obtain the secondary ingot of niobium and titanium alloy.

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Abstract

The invention discloses a casting manufacturing method of a superconducting NbTi alloy. The casting manufacturing method comprises the following steps of carrying out purification and ingot casting of high-melting point metal Nb to obtain an Nb rod, pressing low-melting point sponge active metal Ti into a semi-cylindrical tile, carrying out assembly welding of the Nb rod and the semi-cylindrical tile in an inert gas protective atmosphere to obtain a consutrode, and carrying out electric arc melting more than twice. The superconducting NbTi alloy obtained by the casting manufacturing method has no impurities, high uniformity, less interstitial elements and good plasticity, and is conducive to manufacture of thin core rods suitable for large-scale application and alloy materials having a high current-carrying capability and a low cost.

Description

technical field [0001] The invention belongs to the production and manufacturing method of superconducting materials, and relates to a method of melting and casting high-melting-point refractory metals and lower-melting-point metals into superconducting alloy ingots by using a vacuum consumable electric arc furnace, especially a superconducting NbTi alloy casting manufacturing method. Background technique [0002] Electrodes formed by assembly and welding of high melting point refractory metal niobium purified by electron beam furnace and sponge active metal titanium with low melting point are melted and cast into superconducting alloy ingots in vacuum consumable electric arc furnace, which are mainly used to construct superconducting alloys. Manufacturing of superconducting materials for large-scale projects such as high-energy accelerators, superconducting MRI medical diagnostic devices, controlled nuclear fusion new energy development devices, superconducting energy stora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C27/02
Inventor 颉维平赵红运牟东李明阳陈万和常晓敏白掌军王秋迎
Owner NINGXIA ORIENT TANTALUM IND
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