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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Problems solved by technology

[0007] (1) The powder sintering process is unstable, the sintering temperature and time are unbalanced, and

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

Example Embodiment

[0024] Example 1

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

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

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

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

Example Embodiment

[0030] Example 2

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

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

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

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

Example Embodiment

[0036] Example 3

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

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

[0039] The third step of electron beam melting: Place the tungsten-based-zirconia block mixture in a crucible in the electron beam melting furnace, evacuate to less than 0.0038Pa, turn on the electron gun at a high voltage of 28kV, and a beam current of 700mA for melting, melting for 10 minutes, and solidifying After cooling, the tungsten-zirconia alloy ingot is turned over, at a high pressure of 28kV, b...

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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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