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Manufacturing method of single-grain niobium material for radio frequency superconducting cavity

A technology of radio frequency superconducting cavity and manufacturing method, which is applied in the directions of single crystal growth, single crystal growth, polycrystalline material growth, etc., and can solve the problem that it is difficult to further improve the superconducting performance

Inactive Publication Date: 2014-10-22
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The traditional niobium material processing process used to manufacture superconducting cavities is to make large-grain niobium ingots into blanks, annealing and other processes to make small-grain niobium plates, which are made by electrochemical polishing and other steps, which do not belong to single-crystal niobium plates. , it is difficult to further improve the superconductivity

Method used

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  • Manufacturing method of single-grain niobium material for radio frequency superconducting cavity

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Experimental program
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Effect test

Embodiment 1

[0027] 1. Cut the single crystal niobium material from the large-grained niobium ingot with a diameter of 150mm and a thickness of 20mm. value above 300);

[0028] 2. The single crystal niobium material is processed into niobium sheets by means of cross rolling, with a processing rate of 4% per pass and a thickness of 3.0mm;

[0029] 3. Machining the single crystal niobium plate into a niobium sheet with a diameter of Ф266mm and a thickness of 2.8mm;

[0030] 4. Chemical polishing: use a mixed acid of hydrofluoric acid, nitric acid, and phosphoric acid (volume ratio 1:1:2) to pickle and polish the single crystal niobium sheet;

[0031] 5. Stress relief annealing: at 10 -4 The heat treatment is carried out under the high vacuum condition of Pa, and the treatment temperature is 700°C, and the processing stress is eliminated, and the single-grain niobium material is obtained.

Embodiment 2

[0033] 1. Cut the single crystal niobium material from the large-grained niobium ingot with a diameter of 200-300mm and a thickness of 25mm. RRR value above 300);

[0034] 2. The single crystal niobium material is processed into niobium sheets by means of cross rolling, with a processing rate of 3% per pass and a thickness of 3.0mm;

[0035] 3. Machining the single crystal niobium plate into a niobium sheet with a diameter of Ф496mm and a thickness of 2.8mm;

[0036] 4. Chemical polishing: use a mixed acid of hydrofluoric acid, nitric acid, and phosphoric acid (volume ratio 1:1:2) to pickle and polish the single crystal niobium sheet;

[0037] Stress relief annealing: at 10 -4 The heat treatment is carried out under the high vacuum condition of Pa, and the treatment temperature is 700°C, and the processing stress is eliminated, and the single-grain niobium material is obtained.

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Abstract

The invention discloses a method for manufacturing a single crystal grain niobium material for a radio frequency superconducting cavity. The method comprises the following steps of: refining and purifying high-melting metallic niobium serving as a raw material to prepare niobium ingots, the crystal grain size of which is over phi 100 millimeters and the residual resistance ratio (RRR) value of which is over 300; and cutting single crystal grains, rolling in a rolling compaction manner, and preparing single crystal niobium plates or sheets by thermal treatment, wherein refining and purifying are performed on the high-melting metallic niobium for many times by adopting vacuum electron beams to produce the ingots with the crystal grain size of over phi 250 millimeters, the diameter of the biggest crystal grains is 100 to 140 millimeters, and the RRR value of the ingots is over 300.

Description

technical field [0001] The invention belongs to a method for manufacturing a radio frequency superconducting technical component, in particular to a method for manufacturing a single crystal grain niobium material for a radio frequency superconducting cavity. Background technique [0002] High-energy particle accelerators use high-power microwaves (radio frequency) to establish high-intensity electric fields in resonant cavities to accelerate charged particles. The resonant cavity of the radio frequency superconducting accelerator is made of high-purity metal niobium that meets certain special requirements, and operates at low temperature. [0003] A superconducting accelerator consists of a series of accelerating components. Superconducting accelerating components include superconducting accelerating cavity, thermostat that provides low temperature environment required for superconducting accelerating cavity, microwave power coupler, harmful clutter eliminator (high-order ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/02C22B34/24C22F1/18H05H7/20
Inventor 颉维平陈林李明阳高延洲张保澄白掌军聂全新
Owner NINGXIA ORIENT TANTALUM IND
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