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Preparation method of Mo-Nb-W-Zr alloy single crystal bar

A mo-nb-w-zr alloy technology, applied in the field of preparation of Mo-Nb-W-Zr alloy single crystal rods, can solve problems such as unfavorable single crystal structure

Active Publication Date: 2019-12-24
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These are not conducive to the formation of single crystal structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment includes the following steps:

[0020] Step 1. Coaxially fix the Mo-Nb-W-Zr alloy polycrystalline billet bar with a diameter of 17mm and the Mo-Nb-W-Zr alloy single crystal seed crystal bar with a diameter of 20mm and a crystal orientation of In the smelting chamber of the smelting equipment in the electron beam suspension area, the distance between the lower end face of the Mo-Nb-W-Zr alloy polycrystalline billet rod and the upper end face of the Mo-Nb-W-Zr alloy single crystal seed crystal rod is Half of the diameter of the Mo-Nb-W-Zr alloy polycrystalline billet bar, and then vacuumize the melting chamber to a vacuum degree of 1.0×10 -3 Pa, and then use electron beam heating to weld the lower end surface of the Mo-Nb-W-Zr alloy polycrystalline billet to the upper end surface of the Mo-Nb-W-Zr alloy single crystal seed crystal to obtain Mo-Nb-W- Zr alloy rod; the mass content of Nb in the Mo-Nb-W-Zr alloy polycrystalline blank bar and the Mo-Nb-W-Zr ...

Embodiment 2

[0041] This embodiment includes the following steps:

[0042] Step 1. Coaxially fix the Mo-Nb-W-Zr alloy polycrystalline billet rod with a diameter of 18mm and the Mo-Nb-W-Zr alloy single crystal seed rod with a diameter of 22mm and a crystal orientation of In the smelting chamber of the smelting equipment in the electron beam suspension area, the distance between the lower end face of the Mo-Nb-W-Zr alloy polycrystalline billet rod and the upper end face of the Mo-Nb-W-Zr alloy single crystal seed crystal rod is Half the diameter of the Mo-Nb-W-Zr alloy polycrystalline billet rod, and then vacuumize the melting chamber to a vacuum degree of 8.6×10 -4 Pa, and then use electron beam heating to weld the lower end surface of the Mo-Nb-W-Zr alloy polycrystalline billet to the upper end surface of the Mo-Nb-W-Zr alloy single crystal seed crystal to obtain Mo-Nb-W- Zr alloy bar stock; The mass content of Nb in the Mo-Nb-W-Zr alloy polycrystalline stock bar and the Mo-Nb-W-Zr alloy...

Embodiment 3

[0046] This embodiment includes the following steps:

[0047] Step 1. Coaxially fix the Mo-Nb-W-Zr alloy polycrystalline billet rod with a diameter of 21mm and the Mo-Nb-W-Zr alloy single crystal seed crystal rod with a diameter of 26mm and a crystal orientation of In the smelting chamber of the smelting equipment in the electron beam suspension area, the distance between the lower end face of the Mo-Nb-W-Zr alloy polycrystalline billet rod and the upper end face of the Mo-Nb-W-Zr alloy single crystal seed crystal rod is Half of the diameter of the Mo-Nb-W-Zr alloy polycrystalline billet bar, and then vacuumize the melting chamber to a vacuum degree of 1.0×10 -3 Pa, and then use electron beam heating to weld the lower end surface of the Mo-Nb-W-Zr alloy polycrystalline billet to the upper end surface of the Mo-Nb-W-Zr alloy single crystal seed crystal to obtain Mo-Nb-W- Zr alloy bar; The mass content of Nb in the described Mo-Nb-W-Zr alloy polycrystalline stock bar and Mo-Nb...

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Abstract

The invention discloses a preparation method of a Mo-Nb-W-Zr alloy single crystal bar, which comprises the following steps: 1, coaxially fixing a Mo-Nb-W-Zr alloy polycrystalline blank bar and a Mo-Nb-W-Zr alloy single crystal seed crystal bar in a smelting chamber, vacuumizing the smelting chamber, and carrying out fusion welding to obtain a Mo-Nb-W-Zr alloy bar; and 2, heating and smelting the Mo-Nb-W-Zr alloy bar, wherein the single crystal growth heating power, the vacuum degree of a smelting chamber and the advancing speed V single crystal of the Mo-Nb-W-Zr alloy single crystal seed crystal bar are adjusted, thereby producing the Mo-Nb-W-Zr alloy single crystal bar. According to the method, by controlling the single crystal growth heating power, the vacuum degree of the smelting chamber and the V single crystal, it is guaranteed that the melting zone is fully molten, the temperature gradient of the melting zone is stable, single crystal growth is smoothly and continuously conducted, and the Mo-Nb-W-Zr alloy single crystal bar is obtained.

Description

technical field [0001] The invention belongs to the technical field of rod preparation, and in particular relates to a method for preparing a Mo-Nb-W-Zr alloy single crystal rod. Background technique [0002] Since the 21st century, the development of advanced aerospace equipment systems, space exploration, and weapon systems has put forward a strong demand for refractory metal single crystal materials, especially refractory metal single crystal materials of multi-alloy systems. Although people have tried various new methods and processes for the preparation of metal single crystal materials, the only methods that are really suitable for the preparation of large-scale refractory metal single crystal materials are electron beam zone melting and plasma arc melting. [0003] Since the 1950s, people have carried out the development of refractory metal single crystal materials by using electron beam regional melting technology, and prepared small-sized pure W single crystals, pur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/52C30B13/22C22C27/04
CPCC22C27/04C22C2200/00C30B13/005C30B13/22C30B29/52
Inventor 胡忠武李来平殷涛郭林江郑晗煜高选乔任广鹏杜明焕张平祥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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