Forging method for superconducting tantalum bar

A superconducting and drop-weight forging technology, which is applied in the forging field of superconducting tantalum rods, can solve problems such as broken wires, affecting superconducting performance, and low degree of broken microstructure in the as-cast state, and achieve the effect of improving the degree of inhomogeneity

Inactive Publication Date: 2012-10-03
NINGXIA ORIENT TANTALUM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing technology mainly adopts hot forging processing, the processing rate of each pass is low, and the total processing rate is also low. During the processing of the wire, the tantalum-lined support will be irregularly deformed, and the position of the superconducting wire will be squeezed out, which will affect the superconducting performance and cause quality problems such as wire breakage, which is unacceptable in the production of high-cost superconducting wires.

Method used

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  • Forging method for superconducting tantalum bar
  • Forging method for superconducting tantalum bar
  • Forging method for superconducting tantalum bar

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) Ingot (outer circle diameter × length) φ153×250mm, the chemical composition of the ingot meets the requirements shown in Table 1:

[0019] Table 1: Chemical composition of superconducting tantalum and niobium Not greater than, wt%

[0020] the element

C

O

N

H

Nb

W

standard requirement

0.002

0.0045

0.004

0.0005

0.005

0.005

actual data

0.0005

0.003

0.0018

0.0002

0.003

0.0018

the element

Ti

Mo

Si

Fe

Ni

Ta

standard requirement

0.002

0.002

0.002

0.002

0.002

99.9

actual data

0.0001

0.001

0.001

0.0003

0.0003

99.97

[0021] (2) Preheating, the heating temperature is 180°C, and the holding time is 25 minutes.

[0022] (3) Use a coating material that is uniformly stirred and mixed in the ratio of low-temperature glass powde...

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Abstract

The invention relates to a forging method for a superconducting tantalum bar. The forging method is characterized in that the forging method comprises the following steps: firstly, taking a special superconducting tantalum bar as a raw material, preheating the raw material at the temperature of 150-180 DEG C, preserving the heat for 20-40 minutes, taking out the heated tantalum ingot and uniformly coating the heated tantalum ingot with an oxidation resistant coating, wherein the coating thickness is 2-3 mm and naturally drying in air; heating the dried material at the temperature of 450-500 DEG C, preserving the heat for 210-240 minutes and then taking out the material; secondly, primarily radially upsetting and primarily radially drawing out; thirdly, secondarily radially upsetting and secondarily radially drawing out; and fourthly, triply radially upsetting, stopping forging, carrying out air cooling for 5-10 minutes and then cooling and triply radially drawing out. According to the forging method disclosed by the invention, the forging machining for superconducting products by using a tantalum cast ingot is carried out and a proper hot forging heating process is matched, so that tissues of which the grain size levels and cross section tissue uniformity respectively meet preparation requirements of early-stage tissues are obtained.

Description

technical field [0001] The invention relates to a forging method of a superconducting tantalum rod. Background technique [0002] At present, almost all superconductors in electromagnetic applications are NbTi alloys and Nb 3 Sn complex composition, NbTi and Nb 3 The main application categories of Sn superconductors are: strong current application, weak current application, strong magnetic field and magnetic shielding application. The application of strong electricity is mainly to prepare superconducting cables on multi-core superconducting composite wires for electric energy transmission. This technical method has epoch-making significance for reducing energy loss in the process of electric energy transmission. There are also superconducting energy storage and superconducting power generation applications. [0003] Tantalum rods for superconductivity are key and important components for the production of multi-core superconducting composite wires, which are mainly used as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/06
Inventor 孙伟李桂鹏汪凯同磊李积贤谢新普
Owner NINGXIA ORIENT TANTALUM IND
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