Title:
SMELTING METHOD FOR PREPARING FINE CRYSTALLINE PURE NIOBIUM INGOT
Document Type and Number:
WIPO Patent Application WO/2021/088608
Kind Code:
A1
Abstract:
Disclosed is a smelting method for preparing a fine crystalline pure niobium ingot. In the method, a vacuum electron beam cold bed furnace is used for carrying out smelting to prepare a pure niobium ingot; and during the smelting, 0.01-0.06 wt% of the element yttrium is added. A pure niobium ingot material prepared by using the method has the characteristics of fine crystal grains and a good uniformity of structure, and a uniform and equiaxed finished ingot with a crystal grain size of 5-15 mm and a residual resistance ratio (RRR) value > 300 can be obtained.
Inventors:
XU TIEWEI (CN)
ZHANG SHANSHAN (CN)
LIU YUANCAI (CN)
SUN MINGXUE (CN)
ZHANG QI (CN)
ZHANG SHANSHAN (CN)
LIU YUANCAI (CN)
SUN MINGXUE (CN)
ZHANG QI (CN)
Application Number:
PCT/CN2020/120943
Publication Date:
May 14, 2021
Filing Date:
October 14, 2020
Export Citation:
Assignee:
UNIV QINGDAO TECHNOLOGY (CN)
International Classes:
C22C27/02; B22D7/00; C22C1/02
Foreign References:
| CN110643875A | 2020-01-03 | |||
| CN104480319A | 2015-04-01 | |||
| CN103397236A | 2013-11-20 | |||
| CN1128546A | 1996-08-07 | |||
| CN106391747A | 2017-02-15 | |||
| JPH08325666A | 1996-12-10 | |||
| SU689364A1 | 1990-11-07 |
Attorney, Agent or Firm:
JINAN SHENGDA INTELLECTUAL PROPERTY AGENCY CO.,LTD. (CN)
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