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Method of producing metallic tungsten bar by acid washing and doping tungsten powder

A production method and metal tungsten technology are applied in the field of pickling and doped tungsten powder to produce metal tungsten bars, which can solve problems such as poor press forming performance, and achieve the effects of low porosity, increased strength, and reduced production costs.

Inactive Publication Date: 2004-12-15
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem of poor pressing performance of doped tungsten powder after pickling, improve the strength and pressing yield of the pressed billet, and meet the production requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Example 1: Prepare 200kg of doped metal tungsten bars with a size of 14×14×400mm and a potassium content of 65±5ppm, using 300kg of blue tungsten oxide powder as raw material, and SiO 2 、Al 2 o 3 , KCl in the form of adding silicon, aluminum, and potassium elements to prepare doped blue tungsten, and the doping amount calculated by weight is SiO 2 : 0.3%; Al 2 o 3 : 0.03%; KCl: 0.35%, the doped blue tungsten is reduced to produce doped tungsten powder with a particle size of 3.0um, and then the doped tungsten powder is pickled with hydrochloric acid and hydrofluoric acid respectively. After the acid-washed doped tungsten powder is dried, then the batches are combined and mixed, and the potassium content in the pickled-doped tungsten powder mixture is controlled to be 75ppm (the potassium content of the doped metal tungsten bar of the set value 65ppm) during the mixing. 1.15 times of 1.15 times), the mixed pickling-doped tungsten powder is pressed into a billet with ...

Embodiment 2

[0007] Example 2: Prepare 550kg of doped metal tungsten bars with a size of 14×14×400mm and a potassium content of 60±5ppm, using 800kg of blue tungsten oxide powder as raw material, and SiO 2 、Al 2 o 3 , KCl in the form of adding silicon, aluminum, and potassium elements to prepare doped blue tungsten, and the doping amount calculated by weight is SiO 2 : 0.4%; Al 2 o 3 : 0.05%; KCl: 0.45%, the doped blue tungsten is reduced to produce doped tungsten powder with a particle size of 4.2um, and then the doped tungsten powder is pickled with hydrochloric acid and hydrofluoric acid respectively. After pickling doped tungsten powder is dried, carry out batch again, mix, control the potassium content in the pickling doped tungsten powder mixture during mixing to be 70ppm (for the doping metal tungsten bar potassium content of setting value 60ppm 1.17 times), the mixed pickling-doped tungsten powder is pressed into billets with a pressure of 23MPa (each shift presses 90 billets w...

Embodiment 3

[0008] Example 3: Prepare 280kg of doped metal tungsten bars with a size of 14×14×400mm and a potassium content of 70±5ppm, using 400kg of blue tungsten oxide powder as raw material, and SiO 2 、Al 2 o 3 , KCl in the form of adding silicon, aluminum, and potassium elements to prepare doped blue tungsten, and the doping amount calculated by weight is SiO 2 : 0.4%; Al 2 o 3 : 0.05%; KCl: 0.45%, the doped blue tungsten is reduced to produce doped tungsten powder with a particle size of 4.6um, and then the doped tungsten powder is pickled with hydrochloric acid and hydrofluoric acid respectively. After pickling and doped tungsten powder is dried, batch together, mix, control the potassium content in the mixture of pickling and doped tungsten powder to be 82ppm (the potassium content of the doped metal tungsten bar with a set value of 70ppm) 1.17 times of 1.17 times), the mixed pickling doped tungsten powder is pressed into a billet with a pressure of 28 MPa (110 billets with a ...

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PUM

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Abstract

A process for preparing tungsten bars from blue tungsten oxide powder includes proportionally mixing it with SiO2 0.25-0.5 wt.%, Al2O3 0.01-0.1 wt.% and KCl 0.3-0.5 wt.%), reducing to become doped tungsten powder, washing with hydrochloric acid and hydrofluoric acid, drying, die pressing under 20-28 MPa, and sintering. Its advantages are high strength and percentage of finished products, and stable content of K.

Description

technical field [0001] The invention relates to a method for producing doped tungsten bars, in particular to a method for producing metal tungsten bars by pickling doped tungsten powder. Background technique [0002] Doped tungsten bar is the raw material for high-temperature heating elements such as electric light source, anti-sag tungsten wire in electronic devices and vacuum sprayed tungsten hinge wire. The production of doped tungsten bars usually has special equipment and processes. The conventional method and production process are characterized by: first reducing the blue tungsten oxide added with silicon, aluminum, and potassium to doped tungsten powder, and the doped tungsten powder passes through acid After washing, prepare the mixture according to the requirements, then press it into a billet with a conventional steel mold, and finally sinter it. The existing problem is: after pickling with doped tungsten powder, the press forming performance is poor, and only a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F3/00B22F9/20C22C1/05C22C27/04
Inventor 李倩刘大连沈国文付崇伟封方东
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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