Electron beam smelting method for preparing tungsten electrode material

An electron beam smelting and tungsten electrode 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. Microhardness, the effect of improving plasticity

Inactive Publication Date: 2015-01-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (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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  • Electron beam smelting method for preparing tungsten electrode material
  • Electron beam smelting method for preparing tungsten electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, a brief flow process of a method for preparing tungsten electrode material by electron beam melting is:

[0022] The first step of hot pressing molding: hot pressing and sintering tungsten powder with an average particle size of 0.5 μm and a purity of 99.0% at a temperature of 1900 ° C and a pressure of 30 MPa for 0.5 h to obtain a dense tungsten block;

[0023] The second step of electron beam smelting: put the tungsten block in the crucible of the electron beam smelting furnace, evacuate to 0.0043Pa, turn on the electron gun with a high voltage of 32kV and a beam current of 700mA for smelting for 10min. The smelting effect is better. After solidification and cooling, the tungsten ingot is turned over, and the high voltage is 32kV, the beam current is 700mA and then smelted for 10 minutes, and the tungsten ingot is obtained after solidification and cooling, such as figure 2 Shown is a macroscopic photograph of a tungsten ingot obtained afte...

Embodiment 2

[0026] Such as figure 1 As shown, a brief flow process of a method for preparing tungsten electrode material by electron beam melting is:

[0027] The first step of hot pressing molding: hot pressing and sintering tungsten powder with an average particle size of 1 μm and a purity of 99.2% at a temperature of 1800 ° C and a pressure of 26 MPa for 1 hour to obtain a dense tungsten block;

[0028] The second step of electron beam smelting: put the tungsten block in the crucible of the electron beam smelting furnace, evacuate to 0.0039Pa, turn on the electron gun with a high voltage of 30kV and a beam current of 500mA for smelting for 20min. Due to the high melting point of tungsten, in order to The smelting effect is better. After solidification and cooling, the tungsten ingot is turned over, and the high voltage is 30kV, the beam current is 500mA and then smelted for 20 minutes, and the tungsten ingot is obtained after solidification and cooling;

[0029] The third step of vacu...

Embodiment 3

[0031] Such as figure 1 As shown, a brief flow process of a method for preparing tungsten electrode material by electron beam melting is:

[0032] The first step of hot pressing molding: hot pressing and sintering tungsten powder with an average particle size of 3 μm and a purity of 99.3% at a temperature of 1700 ° C and a pressure of 20 MPa for 3 hours to obtain a dense tungsten block;

[0033] The second step of electron beam smelting: put the tungsten block in the crucible of the electron beam smelting furnace, evacuate to 0.0034Pa, turn on the electron gun with a high voltage of 28kV and a beam current of 400mA for smelting for 30min. The smelting effect is better. After solidification and cooling, the tungsten ingot is turned over, and then smelted for 30 minutes at a high voltage of 28kV and a beam current of 400mA, and the tungsten ingot is obtained after solidification and cooling;

[0034] The third step of vacuum heat treatment: put the above tungsten ingot in a vac...

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Abstract

The invention belongs to the technical field of metallurgical smelting, in particular to an electron beam smelting method for preparing a tungsten electrode material. The electron beam smelting method for preparing the tungsten electrode material comprises the following steps of: firstly, processing tungsten powder in a hot-pressing moulding way to obtain a tungsten block; secondly, performing electron beam smelting on the tungsten block in vacuum at high temperature, and solidifying and cooling to obtain a tungsten ingot; and finally, thermally processing the tungsten ingot in vacuum to obtain the tungsten electrode material. The electron beam smelting method for preparing the tungsten electrode material has the advantages as follows: energy with very high density is provided by an electron beam to melt and smelt a tungsten material; the tungsten electrode material obtained after electron beam vacuum smelting is relatively high in compactness; analysis on change of microhardness judges that the hardness of the tungsten electrode material after the electron beam smelting is relatively large; and through heat treatment, the comprehensive performance of the tungsten material is improved, the microhardness is reduced, the plasticity is improved, the cutting processability and the pressing processability are improved, crystal grains are refined, the organization is adjusted, the comprehensive mechanical properties are improved, and using requirements of the tungsten electrode material are met.

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] Tungsten has a high melting point (3683°C±20°C), strong electron emission capability, high elastic modulus, and low vapor pressure, so it has been used as a thermal electron emission material for a long time. 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] So far, there is still little research on tungsten-based electrode materials in China. Although some manufacturers have produced them,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C1/02
Inventor 谭毅姜大川石爽廖娇石小磊
Owner DALIAN UNIV OF TECH
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