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Tungsten-rhenium alloy and preparation method thereof

A technology of tungsten-rhenium alloy and tungsten-rhenium, which is applied in the field of preparation of tungsten-rhenium alloy and tungsten-rhenium alloy by solid-liquid infiltration doping method, can solve unfavorable filament design and production, large cold resistance change, and tungsten wire cold resistance change major issues

Active Publication Date: 2012-12-12
ZIGONG CEMENTED CARBIDE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Combining the results of the two patents, we found that for the trace doping with a rhenium content of 0.4-0.8%, the doping method of patent 1 has a large fluctuation range of the rhenium content, and the cold resistance of the tungsten wire changes greatly, which is not conducive to Filament design and production
Patent 2 uses the method of making tungsten-rhenium composite powder and then processing it into alloy wire. The specific doping method is not mentioned, but if the rhenium content fluctuates in the range of 0.4-0.8%, it is an important parameter for filament design. Large resistance changes, which is not conducive to filament design

Method used

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  • Tungsten-rhenium alloy and preparation method thereof
  • Tungsten-rhenium alloy and preparation method thereof

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Embodiment 1

[0015] A preparation method of tungsten-rhenium alloy, comprising the steps of:

[0016] A. Preparation of doped tungsten oxide: use tungsten oxide as raw material and K 2 SiO 3 , Al (NO3) 3 Add silicon, aluminum, and potassium in the form of a solution to prepare doped tungsten oxide; calculated by weight percentage, the doping amount is SiO 2 : 0.3%-0.4%, Al 2 o 3 : 0.02%-0.04%, K 2 O: 0.3%-0.5%;

[0017] B. Preparation of doped tungsten powder: reducing doped tungsten oxide and pickling to obtain doped tungsten powder;

[0018] C. Preparation of doped tungsten-rhenate powder: Stir and mix the doped tungsten powder and ammonium rhenate solution. When stirring, the ammonium rhenate solution maintains a temperature of 30°C-50°C. The solid-to-liquid weight ratio of tungsten powder to ammonium rhenate solution ( 100~150): 5; Dried the doped tungsten-rhenium infiltrate at 90°C-110°C for 3-5 hours to obtain doped tungsten-rhenium powder, the doping amount was 0.45%-0.55% rh...

Embodiment 2

[0025] A method for preparing a doped tungsten-rhenium wire with a size of φ0.39mm or less, a potassium content of 67ppm, and a rhenium content of 0.5%, comprising the following steps:

[0026] A. Preparation of doped tungsten oxide: 8.5kg tungsten oxide is used as raw material, K 2 SiO 3 , Al (NO3) 3 Add silicon, aluminum, and potassium in the form of a solution to prepare doped tungsten oxide; calculated by weight percentage, the doping amount is SiO 2 : 0.3%, Al 2 o 3 : 0.04%, K 2 O: 0.35%;

[0027] B. Preparation of doped tungsten powder: the doped tungsten oxide is reduced and pickled, and the obtained doped tungsten powder has a particle size of 3.35um, a potassium content of 94ppm, an oxygen content of 500ppm, and a weight of 6.5kg;

[0028] C. Preparation of doped tungsten-rhenium powder: 6.5kg doped tungsten powder and 210ml ammonium rhenate solution (the ammonium rhenate solution is prepared by dissolving 46.5g ammonium rhenate containing 69.4% rhenium in pure ...

Embodiment 3

[0037] A method for preparing a doped tungsten-rhenium wire with a size of φ0.39mm or less, a potassium content of 65ppm, and a rhenium content of 0.45%, comprising the following steps:

[0038] A. Prepare doped tungsten powder according to Example 2: Doped tungsten oxide is reduced and pickled, and the obtained doped tungsten powder has a particle size of 3.31um, a potassium content of 90ppm, an oxygen content of 500ppm, and a weight of 6.5kg;

[0039] B. Preparation of doped tungsten-rhenium powder: 6.5kg doped tungsten powder and 200ml ammonium rhenate solution (ammonium rhenate solution is prepared by dissolving 42.2g ammonium rhenate containing 69.4% rhenium in pure water with a volume of 175ml for heating and dissolving) When stirring, the ammonium rhenate solution is kept at a temperature of 50°C, and the solid-to-liquid weight ratio of tungsten powder to ammonium rhenate solution is about 150:5; the doped tungsten-rhenium infiltrate after mixing and stirring is dried at...

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Abstract

The invention discloses a tungsten-rhenium alloy which contains 65-75ppm of potassium and 0.45-0.55% of rhenium. The invention also discloses a manufacturing method of the tungsten-rhenium alloy, which comprises the following steps: A. preparing doping tungsten-rhenium powder: mixing doping tungsten powder solid and ammonium rhenate solution to obtain a doping tungsten-rhenium instillation, and drying the instillation to obtain doping tungsten-rhenium powder, wherein in the mixing process, the temperature is kept at 30-50 DEG C and the solid-liquid weight ratio is (100-300):5; B. reducing to obtain tungsten-rhenium mixed powder; C. compacting; D. presintering; and E. sintering to obtain the tungsten-rhenium alloy. The method has the advantages of simple technique, uniform distribution of doping rhenium in the alloy, and favorable material uniformity; and the prepared tungsten-rhenium alloy has favorable high temperature properties and processability, and thus, is an ideal new material for lamp filaments.

Description

technical field [0001] The invention relates to a tungsten-rhenium alloy, and also relates to a preparation method of the tungsten-rhenium alloy, in particular to a method for producing the tungsten-rhenium alloy by a solid-liquid infiltration doping method. Background technique [0002] Tungsten wire is the raw material for manufacturing electric light source materials, high temperature heating elements and high temperature resistant components. The production method of traditional tungsten wire is generally to add silicon, aluminum, potassium and other elements into tungsten oxide to obtain doped tungsten oxide (wherein K and Si are represented by K 2 SiO 3 Added in the form of solution, Al as Al(NO 3 ) 3 solution), and then the doped tungsten oxide is reduced twice by hydrogen at a temperature of 500-950°C or once reduced and acid-washed with hydrochloric acid or hydrofluoric acid (or not) to obtain doped tungsten powder. The doped tungsten powder is pressed by steel ...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/04
Inventor 缪兵
Owner ZIGONG CEMENTED CARBIDE CORP
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