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Method for preparing rare-earth-tungsten electrode material

An electrode material, rare earth tungsten technology, applied in the field of metallurgical smelting, can solve the problems of incomplete and uniform sintering state, unbalanced sintering temperature and time, unstable powder sintering process, etc. The effect of improving performance

Inactive Publication Date: 2013-04-17
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] (1) The powder sintering process is unstable, the sintering temperature and time are unbalanced, and some areas have insufficient sintering, and the complete and uniform sintering state has not been reached.

Method used

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  • Method for preparing rare-earth-tungsten electrode material
  • Method for preparing rare-earth-tungsten electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 As shown, a brief flow process of a preparation method of a rare earth tungsten electrode material is:

[0026] The first step of powder mixing: mix tungsten powder with an average particle size of 0.5 μm and a purity of 99.1% and yttrium oxide powder with an average particle size of 2 μm and a purity of 99.2%, and ball mill for 4 hours to make it fully and uniformly mixed to obtain a mixed powder, oxidized The quality of yttrium powder accounts for 4% of mixed powder total mass;

[0027] The second step of hot press molding: the mixed powder is hot press molded at a temperature of 1700 ° C and a pressure of 25 MPa for 3 hours to obtain a tungsten-yttrium oxide block mixture;

[0028] The third step of electron beam melting: put the tungsten-yttrium oxide block mixture in the crucible of the electron beam melting furnace, evacuate to below 0.0045Pa, turn on the electron gun with a high voltage of 32kV and a beam current of 400mA for melting, melting fo...

Embodiment 2

[0031] Such as figure 1 As shown, a brief flow process of a preparation method of a rare earth tungsten electrode material is:

[0032] The first step of powder mixing: mix tungsten powder with an average particle size of 1 μm and a purity of 99.2% with zirconia powder with an average particle size of 4 μm and a purity of 99.3%, and ball mill it for 1 hour to make it fully and uniformly mixed to obtain a mixed powder, zirconia The quality of the powder accounts for 1% of the total mass of the mixed powder;

[0033] The second step of hot press molding: the mixed powder is hot press molded at a temperature of 1800 ° C and a pressure of 30 MPa for 1 hour to obtain a tungsten-zirconia block mixture;

[0034] The third step of electron beam melting: put the tungsten-zirconia block mixture in the crucible of the electron beam melting furnace, evacuate to below 0.0042Pa, turn on the electron gun with a high voltage of 30kV and a beam current of 600mA for melting, melting for 20min,...

Embodiment 3

[0037] The first step of powder mixing: mix tungsten powder with an average particle size of 3 μm and a purity of 99.1% with lanthanum oxide powder with an average particle size of 6 μm and a purity of 99.2%, and ball mill for 2 hours to fully and uniformly mix to obtain a mixed powder, zirconia The quality of powder accounts for 7% of the total mass of mixed powder;

[0038] The second step of hot press molding: the mixed powder is hot press molded at a temperature of 1900 ° C and a pressure of 35 MPa for 4 hours to obtain a tungsten-zirconia block mixture;

[0039] The third step of electron beam smelting: put the tungsten-zirconia block mixture in the crucible of the electron beam smelting furnace, evacuate to below 0.0038Pa, turn on the electron gun with a high voltage of 28kV and a beam current of 700mA for smelting, smelting for 10min, and solidify After cooling, turn the tungsten-zirconia alloy ingot over, and then melt it for 10 minutes at a high voltage of 28kV and a ...

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Abstract

The invention relates to the technical field of metallurgical smelting, in particular to a method for preparing a tungsten electrode material by smelting. The method comprises the following steps: firstly, sufficiently mixing tungsten powder and rare-earth oxide powder to obtain mixed powder, and processing the mixed powder through hot-press forming to obtain a tungsten-based block mixture; secondly, performing electron beam vacuum high-temperature smelting on the tungsten-based block mixture, and solidifying and cooling to obtain a rare-earth-tungsten alloy ingot; and finally, thermally processing the rare-earth-tungsten alloy ingot in vacuum to obtain the rare-earth-tungsten electrode material. Extremely high-density energy is supplied by an electron beam to smelt a rare-earth-tungsten material, so that the rare-earth-tungsten electrode material obtained after smelting is relatively high in compactness; compared with hot-press sintering, the electron beam smelting technology has an obvious advantage in preparation of a refractory metal and can obtain a more excellent structure; the performance of the electrode material can be improved by doping a certain amount of rare-earth oxide; and through an analysis on change of the microscopic hardness, improvement of the added rare-earth oxide on the hardness of the electrode to a certain extent can be determined.

Description

technical field [0001] The invention belongs to the technical field of metallurgical smelting, in particular to a method for preparing tungsten electrode materials by smelting. Background technique [0002] As an indispensable functional material in machinery, shipbuilding, aerospace, construction, nuclear power, metallurgy and other industries, tungsten electrode materials are mainly used in processes such as inert gas shielded welding, plasma cutting, spraying and smelting. At the same time, another important application of tungsten electrode material is to act as a hot cathode electron emission source in the welding process. [0003] The emission efficiency of pure metal tungsten is very low, and recrystallization at high temperature forms an equiaxed grain structure, which makes the tungsten wire sag and break. In order to overcome the above shortcomings and adapt to the development of modern industrial new technologies and new processes, material workers from various c...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C27/04C22C32/00
Inventor 谭毅石爽游小刚姜大川石小磊
Owner DALIAN UNIV OF TECH
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