Forging method for high purity niobium ingot used for radio frequency superconducting cavity

A radio frequency superconducting cavity and high-purity technology, applied in the field of forging, can solve the problems of not being able to meet the requirements of mass production and technology promotion of high-purity niobium products, large investment costs for equipment and tooling molds, and long processing cycles for equipment forging dies, etc. , to achieve the effect of being easy to popularize, overcoming the small weight of the billet and short production cycle

Active Publication Date: 2017-12-15
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Ingot forging is a necessary production link in the plastic processing of materials. Due to the small ingot shape of high-purity niobium ingots, die forging equipment with high material utilization rate, high processing precision, and continuous and controllable deformation process is usually used for blanking. However, Since the die forging method is limited by the capacity of the equipment, the weight of the forgings is m

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The forging method of the present embodiment comprises the following steps:

[0024] Step 1. Machining the high-purity niobium ingot with a diameter of Φ224mm. After processing, the diameter of the ingot is 212mm. Use a lathe to remove the crust layer formed on the surface after the ingot is smelted and solidified, and remove the surface of the high-purity niobium ingot. In the getter layer, remove the riser and bottom pad with a sawing machine, and measure the chemical composition of the high-purity niobium ingot. The mass content of niobium is 99.99%, and the interstitial impurity element content (wt%): O content is 6.4ppm, The C content is 4.1ppm, the N content is 7ppm, and the H content is 1ppm. The residual resistivity test result of the high-purity niobium ingot is 328;

[0025] Step 2, use a sawing machine to saw and blank the high-purity niobium ingot that removes the riser and the bottom pad in step 1 to obtain a high-purity niobium blank; (Blank height / Blank ...

Embodiment 2

[0033] The forging method of the present embodiment comprises the following steps:

[0034]Step 1. Machining the high-purity niobium ingot with a diameter of Φ217mm. After processing, the diameter of the ingot is 209mm. First, use a lathe to remove the crust layer formed on the surface after the ingot is smelted and solidified, and remove the surface of the high-purity niobium ingot. The getter layer, and then remove the riser and bottom pad with a sawing machine, and measure the chemical composition of the ingot. The mass content of niobium is 99.95%, and the interstitial impurity element content (wt%): O content is 5.4ppm, C The content is 8.1ppm, the N content is 3.9ppm, H≤1ppm, and the ingot residual resistivity test result is 340;

[0035] Step 2, use a sawing machine to saw and blank the high-purity niobium ingot that removes the riser and bottom pad in step 1 to obtain a high-purity niobium billet; the height of the high-purity niobium billet is 415mm, and the height-to...

Embodiment 3

[0043] The forging method of the present embodiment comprises the following steps:

[0044] Step 1. Machining the high-purity niobium ingot with a diameter of Φ219mm. After processing, the diameter of the ingot is 204mm. First, use a lathe to remove the condensate layer formed on the surface after the ingot is smelted and solidified, and remove the surface of the high-purity niobium ingot. The getter layer, and then remove the riser and bottom pad with a sawing machine, and measure the chemical composition of the ingot. The mass content of niobium is 99.99%, and the interstitial impurity element content (wt%): O content is 8.1ppm, C The content is 5.5ppm, the N content is 3.9ppm, H≤1ppm, and the ingot residual resistivity test result is 363;

[0045] Step 2, use a sawing machine to saw and blank the high-purity niobium ingot that removes the riser and the bottom pad in step 1 to obtain a high-purity niobium blank; (blank height / blank diameter) is 2.2;

[0046] Step 3. Carry ...

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Abstract

The invention discloses a forging method for a high purity niobium ingot used for a radio frequency superconducting cavity. The forging method for the high purity niobium ingot used for the radio frequency superconducting cavity comprises the following steps that first, machining is conducted on the high purity niobium ingot used for the radio frequency superconducting cavity; second, the high purity niobium ingot is cut to obtain high purity niobium blank; third, vacuum annealing treatment is conducted on the high purity niobium blank; fourth, the high purity niobium blank is vertically placed on a lower hammer anvil of an oil hydraulic press, and multiple times of upsetting forging is conducted; fifth, the high purity niobium blank after upsetting forging is horizontally placed on the lower hammer anvil of the oil hydraulic press, and forging and pressing deformation is conducted by using an upper hammer anvil of the oil hydraulic press; sixth, shrinking tails at the ends of the high purity niobium forging blank are removed, and milling machining is conducted on the upper and lower surfaces of the high purity niobium forging blank; and seventh, vacuum annealing treatment is conducted on the high purity niobium forging blank to obtain the high purity niobium ingot. According to the forging method for the high purity niobium ingot used for the radio frequency superconducting cavity, machining of the high purity niobium ingot only by using a method of die forging blanking at present is broken through, relying on equipment of the high purity niobium forging technology is reduced, producing efficiency of the high purity niobium ingot is improved, introducing of impurity gap elements especially oxygen, nitrogen and hydrogen is reduced, and excessively fast reducing of residual resistance ratio of cast ingot is avoided.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a forging method of high-purity niobium ingots for radio frequency superconducting cavities. Background technique [0002] Particle accelerators are indispensable and important experimental devices in high-energy physics research. As an important part of the accelerator, the radio frequency superconducting cavity will directly affect the performance of the entire particle accelerator. High-purity niobium is the first choice material for making radio-frequency particle acceleration superconducting cavities, and its purity is the key to the performance of radio-frequency superconducting cavities. The superconducting resonant cavity made of high-purity metal niobium has the advantages of high acceleration gradient, small energy divergence, and long service life. In recent years, continuous breakthroughs in low-temperature superconducting technology have provided broad ...

Claims

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Application Information

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IPC IPC(8): B21J5/08B21J5/00B21J1/06B21J1/02H05H7/20
CPCB21J1/02B21J1/06B21J5/002B21J5/08H05H7/20
Inventor 郭金明郭学鹏郑翠萍宋健倪沛彤肖松涛高婷
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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