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A kind of rare earth tungsten-molybdenum alloy used for electrode and preparation method thereof

A rare earth tungsten and molybdenum alloy technology, applied in the field of alloy research, can solve the problems of poor electrical conductivity of tungsten and molybdenum alloys, insufficient alloy sintering, and low recrystallization temperature, so as to improve processing performance, strengthen grain boundary bonding force, and improve resistance The effect of high temperature performance

Active Publication Date: 2020-12-18
廊坊开发区阳雨钨业股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the price of tungsten as a precious metal is relatively high, and Chinese enterprises need to pay high anti-dumping duties in the process of exporting electrodes with a tungsten content higher than 94% to the EU, which greatly increases the cost
[0003] Tungsten and molybdenum are collectively referred to as refractory metals. Tungsten-molybdenum alloys improve the disadvantage of poor toughness of tungsten. However, due to the poor electrical conductivity of molybdenum, the resistivity of molybdenum is as high as 5.6Ω·mm at room temperature. 2 / m, much higher than 0.053Ω·mm of tungsten 2 / m, the electrical conductivity of the tungsten-molybdenum alloy is poor, the electron work function is high, and the arcing voltage is high; secondly, due to the inconsistent melting point of the tungsten-molybdenum alloy, the alloy is brittle due to insufficient sintering, and the processing performance is poor. In addition, the grain boundary binding force in tungsten-molybdenum alloy is weak, the recrystallization temperature is low, and the high temperature resistance is worse than that of pure metal tungsten. Therefore, its use as an electrode is limited

Method used

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  • A kind of rare earth tungsten-molybdenum alloy used for electrode and preparation method thereof
  • A kind of rare earth tungsten-molybdenum alloy used for electrode and preparation method thereof
  • A kind of rare earth tungsten-molybdenum alloy used for electrode and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0047] The preparation of rare earth tungsten-molybdenum alloy includes the following steps:

[0048] 1) Powder mixing: According to the weight ratio of 64% tungsten, 33.5% molybdenum and 2.5% rare earth, put 32kg of tungsten powder, 16.75kg of molybdenum powder, 0.88kg of lanthanum oxide, 0.32kg of yttrium oxide and 0.34kg of zirconia into the In the "V" type mixer, mix for 0.5h to obtain synthetic powder;

[0049] 2) Powder filling: Take 920 grams of synthetic powder and put it into the rubber sleeve on the vibration platform, vibrate for 0.5h, vibrate until it is uniform and dense, and then seal it with a plug;

[0050] 3) Forming: Place the sealed rubber sleeve on the rubber sleeve frame, then put the rubber sleeve frame into the barrel of the cold isostatic press, increase the pressure from 0MPa to 145-165MPa within 5-6min, The duration of the pressure holding process under 165MPa is 1-5min, and then the pressure relief is completed within 3-5min. After the cool pressing...

Embodiment 2

[0057] The preparation of rare earth tungsten-molybdenum alloy includes the following steps:

[0058] 1) Powder mixing: According to the weight ratio of 30% tungsten, 68.5% molybdenum and 1.5% rare earth, put 15kg tungsten powder, 34.25kg molybdenum powder, and 0.92kg cerium oxide into the "V" type mixer, mix for 0.5h, get synthetic powder;

[0059] 2) Powder filling: Take 1000 grams of synthetic powder and put it into the rubber sleeve on the vibration platform, vibrate for 0.5h, vibrate until it is uniform and compact, and then seal it with a plug;

[0060] 3) Forming: Place the sealed rubber sleeve on the rubber sleeve frame, then put the rubber sleeve frame into the cylinder of the cold isostatic press, increase the pressure from 0MPa to 155MPa within 5min, and maintain the pressure at 155MPa The duration is 3 minutes, and then the pressure relief is completed within 4 minutes. After the cool pressing is completed, the material rack is taken out, and the compact is obtain...

Embodiment 3

[0067] The preparation of rare earth tungsten-molybdenum alloy includes the following steps:

[0068] 1) Powder mixing: according to the weight ratio of 90% tungsten, 8% molybdenum and 2% rare earth, put 45kg tungsten powder, 4kg molybdenum powder, and 1.23kg cerium oxide into a "V" type mixer, and mix for 0.5h to obtain synthetic powder;

[0069] 2) Powder filling: Take 1350 grams of synthetic powder and put it into the rubber sleeve on the vibration platform, vibrate for 0.5h, vibrate until it is uniform and dense, and then seal it with a plug;

[0070] 3) Forming: Place the sealed rubber sleeve on the rubber sleeve frame, then put the rubber sleeve frame into the cylinder of the cold isostatic press, increase the pressure from 0MPa to 160MPa within 5min, and maintain the pressure at 160MPa The duration is 3 minutes, and then the pressure relief is completed within 4 minutes. After the cool pressing is completed, the material rack is taken out, and the compact is obtained b...

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Abstract

The invention provides a rare-earth tungsten-molybdenum alloy for an electrode for the first time. The rare-earth tungsten-molybdenum alloy comprises the following components of, in percentage by weight, 26%-94% of tungsten, 5%-73.7% of molybdenum and 0.3%-4% of rare earth. A common-diameter electrode prepared from the alloy has a small electrical resistivity, a small arcing current and a larger tolerance current; the stability of arcing can be increased in the using process of the electrode, the appearance quality of welding seams can be improved, the welding depth can be improved, and the welding strength can be improved. In addition, the alloy has good mechanical property and high-temperature resistance; and it is ensured that alloy components can be uniformly distributed in the preparation process of the alloy and the content of each component is stable, the yield of the product can be improved, and the method has a large scale and a commercial production prospect.

Description

technical field [0001] The invention relates to the field of alloy research. More specifically, it relates to a rare earth tungsten-molybdenum alloy for electrodes and a preparation method thereof. Background technique [0002] With the continuous development of modern science and technology, welding technology, cutting materials, and thermal spraying varieties, specifications and shapes are becoming more and more diverse. In the fields of modern tungsten inert gas shielded welding and plasma, automatic welding, plasma spray welding, plasma cutting and high-tech A series of new technologies and processes such as precision welding, and the precision of thermal spraying process have put forward higher requirements for the reliability and stability of electrode materials. Among them, tungsten and tungsten alloy electrodes are one of the widely used electrodes. However, the price of tungsten as a precious metal is relatively high, and Chinese enterprises need to pay high anti-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C27/04C22C1/05B22F3/04B22F3/10B22F3/24B23K9/24
CPCB22F3/04B22F3/10B22F3/24B22F2003/248B23K9/24C22C1/05C22C27/04
Inventor 姜雷王永革
Owner 廊坊开发区阳雨钨业股份有限公司
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