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Machining method of high-RRR-value high-purity niobium material and niobium material for radio frequency superconducting cavity

A processing method and high-purity technology, applied in accelerators, electrical components, etc., can solve the problems that the RRR of the finished sheet cannot reach more than 300, the gas elements cannot meet the corresponding requirements, the grain size is uneven, etc., and achieve large market promotion value. With the effect of protecting value, improving product direct yield, and improving isotropy

Pending Publication Date: 2020-08-11
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The main disadvantages of the existing technology are: the RRR of the finished sheet cannot reach more than 300; the grain size is uneven, and there are large grains; the gas elements cannot meet the corresponding requirements; the horizontal and vertical differences in mechanical properties exceed 10%, and the strain hardening coefficient n<0.3, the direct yield of the product is low, basically around 50%

Method used

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  • Machining method of high-RRR-value high-purity niobium material and niobium material for radio frequency superconducting cavity
  • Machining method of high-RRR-value high-purity niobium material and niobium material for radio frequency superconducting cavity
  • Machining method of high-RRR-value high-purity niobium material and niobium material for radio frequency superconducting cavity

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Embodiment 1

[0040] The embodiment of the present invention provides a processing method for high-purity niobium material with high RRR value. The processing method for high-purity niobium material with high RRR value comprises the following steps:

[0041] (1) The RRR300 superconducting niobium ingot is obtained by electron beam melting. The diameter of the superconducting niobium ingot is 285 mm and the length is 1250 mm. The composition of the ingot is shown in Table 1. Table 1 is the elemental composition of the superconducting niobium ingot data sheet;

[0042] Table 1 Elemental composition data table of superconducting niobium ingot

[0043]

[0044] (2) The superconducting niobium ingot obtained in step (1) is ultrasonically tested, and then the superconducting niobium ingot is radially squared, axially elongated, and rounded. The specific forging sequence and dimensional changes are as follows: first, the cast The ingot is forged into a square end face with a size of 240×Lmm→th...

Embodiment 2

[0059] (1) The RRR300 superconducting niobium ingot is obtained by electron beam melting. The diameter of the superconducting niobium ingot is 285 mm and the length is 400 mm. The composition of the ingot is shown in Table 2;

[0060] Table 2 Elemental composition data table of superconducting niobium ingot

[0061]

[0062] (2) The superconducting niobium ingot obtained in step (1) is ultrasonically tested, and then the superconducting niobium ingot is radially squared, axially elongated, and rounded. The specific forging sequence and dimensional changes are as follows: first, the cast The ingot is forged into a square end face with a size of 240×Lmm→the end face is an equilateral octagon with a size of 240×Lmm→the end face is a square with a size of 200×Lmm→the end face is an equilateral octagon with a size of 200×Lmm →The end face is square, the size is 170×Lmm→The end face is equilateral octagon, the size is 170×Lmm→The end face is square, the size is 160×Lmm→The end fa...

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Abstract

The invention relates to a machining method of a high-RRR-value high-purity niobium material and the niobium material for a radio frequency superconducting cavity. The machining method comprises the steps of ingot forging, blank saw cutting, blank surface machining, blank acid pickling, blank heat treatment, blank cogging, plate blank trimming, acid pickling, plate blank rolling, finished productdischarging, polish-grinding, acid pickling, finished product heat treatment, finished product shearing, primary fine polishing and finished product acid pickling. By means of the machining method, the grain size of a finished plate is kept between 4.5 grades and 5.5 grades, and the uniformity is good; the mechanical properties all meet the requirements, the transverse and longitudinal differenceis controlled within 15%, the tensile strength and yield are controlled within 10%, and the elongation is controlled within 10%; wherein the RRR value is controlled to be more than 300; the content ofgas elements can meet the requirements; and moreover, the product direct recovery rate is improved, the manufacturing cost of manufacturers can be greatly reduced, and mass production can be realized.

Description

technical field [0001] The invention relates to the technical field of niobium material processing, in particular to a processing method for high-purity niobium material with a high RRR value and the niobium material for radio frequency superconducting cavities. Background technique [0002] Niobium is the best metal used to make superconducting accelerating resonators. Past, present, in development or installation stages, and future projects include: KEK's TRISTAN ring storage; CERN's LEP ring storage; DESY's HERA electron-proton ring storage; CEBAF at Jefferson Laboratories; TESLA Test Facility TTF; source (SNS); superconducting accelerating resonator for generating intense particle beams (Cornell University); future TESLA project; synchrotron light source with superconducting resonator; free electron laser with superconducting linear accelerator; Proton accelerators for nuclear waste conversion and neutron production; rare isotope accelerators. [0003] Superconducting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00H05H7/20
CPCB23P15/00H05H7/20
Inventor 李小平邵杰张亚军张九海李兆博杜领会李积贤马小文
Owner NINGXIA ORIENT TANTALUM IND
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