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Quaternary composite rare earth tungsten alloy electrode material and preparation method thereof

An electrode material and compound rare earth technology, which is applied in the field of material metallurgy, can solve the problems that the performance cannot be comparable to that of thoriated tungsten, cannot fully obtain thoriated tungsten electrodes, and the application range of zirconium tungsten electrodes is narrow. Good corrosion resistance and long service life

Inactive Publication Date: 2020-04-21
ACHEMETAL TUNGSTEN & MOLYBDENUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cerium tungsten electrodes can replace thoriated tungsten electrodes only in small current welding tungsten electrodes; lanthanum tungsten electrodes are better in use, and the performance is closest to thoriated tungsten, but the performance is single and difficult to process; yttrium tungsten and zirconium tungsten electrodes have narrow application ranges, The use performance is not comparable to that of thoriated tungsten, and the processing performance is also average.
Therefore, a single rare earth electrode cannot fully obtain a thoriated tungsten electrode

Method used

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  • Quaternary composite rare earth tungsten alloy electrode material and preparation method thereof
  • Quaternary composite rare earth tungsten alloy electrode material and preparation method thereof
  • Quaternary composite rare earth tungsten alloy electrode material and preparation method thereof

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Effect test

Embodiment 1

[0022] A preparation method of a quaternary composite rare earth tungsten alloy electrode material, the specific preparation steps are as follows:

[0023] Step 1, the raw material lanthanum nitrate 160g, yttrium nitrate 34g, zirconium nitrate 27.6g and cerium nitrate 50.5g are mixed completely in distilled water after the weight percentage, obtain quaternary rare earth nitrate aqueous solution after filtering;

[0024] Step 2: Put 7000 g of ammonium paratungstate into the doping pot, add distilled water and the quaternary rare earth nitrate aqueous solution in step 1 in sequence, mix evenly, and at the same time pass steam to dry the above mixture, and pass through a 40-mesh sieve to obtain a mixed powder;

[0025] Step 3, reducing the mixed powder obtained in step 2 twice to obtain multi-element composite rare-earth tungsten alloy powder, which is pressed into tungsten alloy bars by cold isostatic pressing, specifically:

[0026] 1) One-time reduction, using a large four-tub...

Embodiment 2

[0038] A preparation method of a quaternary composite rare earth tungsten alloy electrode material, the specific preparation steps are as follows:

[0039] Step 1. Dissolve 172g of lanthanum nitrate, 27.6g of zirconium nitrate, 50.8g of yttrium nitrate and 63.1g of cerium nitrate in percentage by weight in distilled water after mixing, and obtain a quaternary rare earth nitrate aqueous solution after filtration;

[0040] Step 2: Put 6979 g of ammonium paratungstate into the doping pot, add distilled water and the quaternary rare earth nitrate aqueous solution in step 1 in sequence, mix evenly, and at the same time pass steam to dry the above mixture, and pass through a 50-mesh sieve to obtain a mixed powder;

[0041] Step 3, reducing the mixed powder obtained in step 2 twice to obtain multi-element composite rare-earth tungsten alloy powder, which is pressed into tungsten alloy bars by cold isostatic pressing, specifically:

[0042] 1) One-time reduction, using a large four-tu...

Embodiment 3

[0055] A preparation method of a quaternary composite rare earth tungsten alloy electrode material, the specific preparation steps are as follows:

[0056] Step 1, mix 199g of raw material lanthanum nitrate, 27.6g of zirconium nitrate, 50.8g of yttrium nitrate, 63.1g of cerium nitrate, and 340.5g of rare earth oxides in distilled water, and filter to obtain a quaternary rare earth nitrate aqueous solution;

[0057] Step 2. Put 6964g of ammonium paratungstate into the doping pot, add distilled water and the aqueous solution of quaternary rare earth nitrate in step 1 in turn, mix evenly, and at the same time, pass steam to dry the above mixture and pass it through a 60-mesh sieve to obtain a mixed powder;

[0058] Step 3, reducing the mixed powder obtained in step 2 twice to obtain multi-element composite rare-earth tungsten alloy powder, which is pressed into tungsten alloy bars by cold isostatic pressing, specifically:

[0059] 1) One-time reduction, using a large four-tube re...

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Abstract

The invention relates to a quaternary composite rare earth tungsten alloy electrode material. The material comprises the following raw material of, in percentage by weight, 1.0% to 1.5% of lanthanum oxide, 0.1% to 0.3% of zirconium oxide and yttrium oxide, 0.3% to 0.5% of cerium oxide, 2% to 2.5% of rare earth oxide and the balance tungsten oxide. The specific preparation method comprises the procedures of solid-liquid doping, secondary reduction, isostatic cool pressing, sintering, rotary swaging, wire drawing, straightening, cutting, and polishing and burnishing. According to the method, thequaternary rare earth tungsten electrode is prepared by considering the excellent properties of low electron work function, easiness in arcing, slow growth of tip grains, long service life, large bearing current and the like of a lanthanum tungsten electrode and also considering the characteristics of slender arc beam, deeper fusion depth and high welding strength during medium and large currentwelding of the yttrium-tungsten electrode, and due to the good corrosion resistance of zirconium and the small arcing current and easy arcing of cerium tungsten, lanthanum, yttrium, zirconium and cerium are mutually considered in the electrode, so that good comprehensive performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of material metallurgy, and in particular relates to a quaternary composite rare earth tungsten alloy electrode material and a preparation method thereof. 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. An important application is as a hot cathode electron emission source during welding. Pure metal tungsten electrode has large electronic work function, high arc starting voltage, low emission efficiency, and is easy to recrystallize at high temperature, resulting in grain growth, fast consumption, and easy fracture. In order to overcome the above shortcomings and adapt to the development of new technologies and processes in modern industry, material workers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C32/00C22C1/05B22F9/22B22F3/10B22F3/17
CPCB22F3/1017B22F3/17B22F9/22B22F2003/175B22F2998/10C22C1/05C22C27/04C22C32/0031B22F3/04
Inventor 杨景红朱宏伟张喜堂耿宏安
Owner ACHEMETAL TUNGSTEN & MOLYBDENUM
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