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Sintering method for rear earth tungsten electrode billets

A sintering method, rare earth tungsten technology, applied in the field of powder metallurgy, can solve the problems of reduced yield, large temperature gradient of tungsten billet, high sintering cost, etc., and achieve the effect of high yield and high efficiency physical properties

Inactive Publication Date: 2014-06-18
BGRIMM ADVANCED MATERIALS SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation of rare earth tungsten electrodes in the existing technical solutions mainly adopts vertical fusion sintering. Because of its sintering process characteristics, vertical fusion sintering results in a large temperature gradient of tungsten billets, poor sintering density consistency, large power consumption and hydrogen consumption, and high sintering costs. The vertical melting strip needs to cut off the chuck parts at both ends (about 4%), and the yield rate is reduced.

Method used

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  • Sintering method for rear earth tungsten electrode billets
  • Sintering method for rear earth tungsten electrode billets
  • Sintering method for rear earth tungsten electrode billets

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: first La 2 o 3 The content is 1.5%, the weight after isostatic pressing is 500g, and the tungsten billet with a length of 200mm is sent into the cavity of the intermediate frequency induction furnace, and the hydrogen flow is introduced into the cavity; Raise the temperature at a rate of 1200°C, keep the temperature for 2 hours, continue to heat up to 2000°C, and keep the temperature for 4 hours; then cut off the power supply, and take out the sintered body after the temperature in the cavity reaches normal temperature.

Embodiment 2

[0029] Embodiment 2: at first CeO 2 The content is 2%, the weight after isostatic pressing is 1000g, and the tungsten billet with a length of 500mm is sent into the cavity of the intermediate frequency induction furnace, and the hydrogen flow is introduced into the cavity; Raise the temperature at a rate of 1400°C, keep it warm for 2 hours, continue to raise the temperature to 2400°C, and keep it warm for 2 hours; cut off the power supply, and take out the sintered body after the temperature in the cavity reaches normal temperature.

Embodiment 3

[0030] Embodiment 3: first La 2 o 3 , Y 2 o 3 , CeO 2 The total content of three kinds of rare earth oxides is 2.2%, the weight after isostatic pressing is 1500g, and the tungsten billet with a length of 400mm is sent into the cavity of the intermediate frequency induction furnace, and the hydrogen flow is introduced into the cavity; start the intermediate frequency sintering furnace , heat up at a rate of 200°C per hour, heat up to 1200°C, keep warm for 2 hours, continue to heat up to 2200°C, keep warm for 3 hours; cut off the power supply, and take out the sintered body after the temperature in the cavity reaches normal temperature.

[0031] According to the rare earth tungsten electrode billets obtained in the above three embodiments, the test density of the rare earth tungsten electrode billets obtained in the above three embodiments is shown in the following table:

[0032] Table 1

[0033]

[0034] like figure 2 The schematic diagram of the XRD result of the ra...

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Abstract

The invention discloses an sintering method for rear earth tungsten electrode billets. The sintering method comprises: firstly enabling electrode compositions to accord with the weight ratio of a final product, adding one or multiple of rear earth oxides such as La2O3, Y2O3, CeO2 and ZrO2 into a tungsten billet; sending the molded rear earth tungsten electrode billet into the chamber of a medium-frequency sintering furnace, and introducing hydrogen flow into the chamber; starting the medium-frequency furnace, heating to 2000-2400 DEG C with a temperature-raising speed of 100-300 DEG C / h, and setting two or more thermal-insulation points according to material condition, and setting the thermal-insulation time of each thermal-insulation point to be 2-4 h; and switching off the power supply of the medium-frequency sintering furnace, when the temperature of the chamber is reduced to normal temperature, taking out the sintering body. By employing the sintering method, uniform-physical-property high-yield rear earth tungsten billets can be supplied in large scale with high efficiency.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a sintering method for a rare earth tungsten electrode billet. Background technique [0002] Tungsten is a high-melting metal with a melting point of 3410°C, so it is a special process to make it into a regular shape. Adding rare earth elements to tungsten can effectively improve the performance of the material, but the difficulty of forming and processing is significantly increased, and the preparation of rare earth tungsten electrodes from rare earth tungsten billets still needs a long process, which generally includes sintering → blanking → 203 spinning Forging→202 rotary forging→201 rotary forging→chain drawing→straightening→cutting→polishing. [0003] The preparation of rare earth tungsten electrodes in the existing technical solutions mainly adopts vertical fusion sintering. Because of its sintering process characteristics, vertical fusion sintering results in a ...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/04B22F3/16
Inventor 李炳山彭鹰崔云涛王芦燕刘家均刘山宇
Owner BGRIMM ADVANCED MATERIALS SCI & TECH
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