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Preparation method of high-purity niobium ingot casting for radio frequency superconducting cavity

A radio frequency superconducting cavity and ingot casting technology is applied in the field of preparation of high-purity niobium ingots for radio frequency superconducting cavity, which can solve the problems of high impurity content of niobium bars, unattainable chemical composition and RRR value of ingots, etc. Simple method, simple operation, reasonable design effect

Inactive Publication Date: 2015-04-01
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional carbothermal reduction niobium bar has high impurity content. After two normal vacuum electron beam smelting, the chemical composition and RRR value of the ingot cannot meet the technical requirements of high-purity niobium ingot for radio frequency superconducting cavity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Niobium slabs produced by the thermite reduction method are used as raw materials, and niobium ingots are obtained through 3 times of vacuum electron beam smelting, and the vacuum degree of the 3 times of vacuum electron beam smelting is not greater than 4×10 -3 Pa, the specific electric energy of 3 vacuum electron beam smelting is 9 degrees / kg, 9.5 degrees / kg and 10 degrees / kg in sequence, and after each smelting, the surface of the smelted ingot is peeled off by 3mm, and then the peeled ingot is used Rinse with deionized water. The mass content of impurities in the niobium lath used is: tantalum 30ppm, silicon 70ppm; tungsten ≤ 10ppm, molybdenum ≤ 10ppm, titanium ≤ 10ppm, zirconium ≤ 10ppm, copper ≤ 10ppm, chromium ≤ 10ppm, nickel ≤ 10ppm, iron ≤ 10ppm , oxygen is 100ppm, nitrogen is 40ppm, and carbon is ≤10ppm.

[0016] The niobium ingot prepared in this example is tested, the RRR value is 420, and the mass content of impurities is: tantalum 35ppm, silicon ≤ 1ppm, t...

Embodiment 2

[0018] Niobium slabs produced by the thermite reduction method are used as raw materials, and niobium ingots are obtained through 5 times of vacuum electron beam smelting, and the vacuum degree of 5 times of vacuum electron beam smelting is not greater than 3×10 -3 Pa, the specific electric energy of 5 times of vacuum electron beam melting is 8 degrees / kg, 9 degrees / kg, 10 degrees / kg, 10.5 degrees / kg and 11 degrees / kg, and the surface of the melted ingot is peeled off after each smelting 2mm, and then the peeled ingot is cleaned with deionized water. The mass content of impurities in the niobium lath used is: tantalum 320ppm, silicon 100ppm; tungsten 33ppm, molybdenum 40ppm, titanium ≤ 10ppm, zirconium ≤ 10ppm, copper ≤ 10ppm, chromium ≤ 10ppm, nickel ≤ 10ppm, iron ≤ 10ppm , oxygen is 180ppm, nitrogen is 60ppm, and carbon is 35ppm.

[0019] The niobium ingot prepared in this example is tested, the RRR value is 380, and the mass content of impurities is: tantalum is 35ppm, tun...

Embodiment 3

[0021] Niobium slabs produced by the thermite reduction method are used as raw materials, and niobium ingots are obtained through 7 times of vacuum electron beam smelting, and the vacuum degree of 7 times of vacuum electron beam smelting is not greater than 5×10 -3 Pa, the specific electric energy of 7 times of vacuum electron beam melting is 8 degrees / kg, 9 degrees / kg, 10 degrees / kg, 10.5 degrees / kg, 11 degrees / kg, 11.5 degrees / kg and 12 degrees / kg, and each time After smelting, peel off the surface of the smelted ingot by 1 mm, and then clean the peeled ingot with deionized water. The mass content of impurities in the niobium lath used is: tantalum 420ppm, silicon 90ppm; tungsten 42ppm, molybdenum 35ppm, titanium ≤ 10ppm, zirconium ≤ 10ppm, copper ≤ 10ppm, chromium ≤ 10ppm, nickel ≤ 10ppm, iron ≤ 10ppm , oxygen is 320ppm, nitrogen is 80ppm, and carbon is 55ppm.

[0022] The niobium ingot prepared in this example is tested, and the RRR value is 310, and the mass content of i...

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Abstract

The invention discloses a preparation method of a high-purity niobium ingot casting for a radio frequency superconducting cavity. The preparation method comprises performing vacuum electronic torch melting on a niobium batten for 3-7 times, thereby obtaining the high-purity niobium ingot casting; the specific electric energy of the vacuum electronic torch melting is 8-12 degrees per kilometer, and the vacuum degree of the vacuum electronic torch melting is not greater than 5*10<-3>Pa. The preparation method is reasonable in design, simple, simple and convenient to operate; the practical problems existing in the traditional niobium ingot casting production process can be effectively solved and the requirements on stabilized and large-scale production of the high-purity niobium ingot casting for the radio frequency superconducting cavity are met; the vacuum electronic torch melting is performed for 3-7 times, and by controlling the specific electric energy, the RRR value and the components of the prepared niobium ingot casting both conform to the requirements of the high-purity niobium ingot casting for the radio frequency superconducting cavity.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-purity niobium ingots, and in particular relates to a method for preparing high-purity niobium ingots for radio frequency superconducting cavities. Background technique [0002] Radio-frequency superconducting cavities are the key components of high-energy particle accelerators. The metal niobium used to prepare radio-frequency superconducting cavities requires not only high purity, but also high residual resistivity (RRR). In recent years, with the in-depth research on high-energy particles at home and abroad, the research and construction of high-energy particle accelerators have developed rapidly, and the demand for high-purity niobium used to prepare radio frequency superconducting cavities has become increasingly strong. RRR≥300 of the ingot is required for use, and the chemical composition is required to meet the requirements of tantalum≤500ppm; silicon≤100ppm; tungsten, molybden...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/04C22B9/22C22B34/24
Inventor 张英明郭学鹏席恩平王娟吝靖玉谭江
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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