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, small shrinkage and low impurity content.

Inactive Publication Date: 2004-02-18
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

[0007] 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, add silicon, aluminum, potassium elements to prepare doped blue tungsten, 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. After the pickling-doped tungsten powder is dried, batching and mixing are carried out. During the mixing, the potassium content of the pickling-doped tungsten powder mixture is controlled to 75ppm (it is the set value of 65ppm for the potassium content of the doped metal tungsten bar 1.15 times), the mixed acid-washed doped tungsten powder is pressed into billets at a pressure of 20MPa (100 billets with a size of 14×14×400mm per ...

Embodiment 2

[0008] 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, add silicon, aluminum, potassium elements to prepare doped blue tungsten, 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. After the pickling-doped tungsten powder is dried, batching, mixing, and mixing are carried out to control the potassium content of the pickling-doped tungsten powder mixture to 70ppm (which is the set value of 60ppm for the potassium content of the doped metal tungsten bar 1.17 times), the mixed acid-washed doped tungsten powder is pressed into billets at a pressure of 23MPa (90 billets with a size of 14×14×400mm are pressed per ...

Embodiment 3

[0009] 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, add silicon, aluminum, potassium elements to prepare doped blue tungsten, 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. After the pickling doped tungsten powder is dried, it is batched and mixed. When mixing, the potassium content of the pickling doped tungsten powder mixture is controlled to 82ppm (it is the set value of 70ppm for the potassium content of the doped metal tungsten bar 1.17 times), the mixed pickling doped tungsten powder is pressed into billets at a pressure of 28MPa (110 billets with a size of 14×14×400mm are pressed per shift). T...

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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 manufacturing high temperature heating elements such as anti-sagging tungsten wires in electric light sources and electronic devices and vacuum sprayed tungsten hinge wires. 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 with silicon, aluminum, and potassium into doped tungsten powder, and the doped tungsten powder is passed through acid After washing, the mixture is prepared according to the requirements, and then pressed into a billet with a conventional steel mold, and finally sintered. The problem is that after the doped tungsten powder is pickled, the compression molding perform...

Claims

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Application Information

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Patent Type & Authority Applications(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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