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Processing method of tungsten filament and additive thereof

An additive and tungsten wire technology, applied in the field of tungsten wire production methods and additives, can solve the problems of long reduction time, low production efficiency, and large amount of addition, and achieve the effects of reducing production processes, improving production efficiency and stable quality

Inactive Publication Date: 2007-08-01
刘占波
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Doped tungsten oxide is difficult to reduce, less loading, long reduction time, low production efficiency, and poor particle size distribution of tungsten powder. The specific performance is that the average particle size of tungsten powder changes greatly before and after pickling, the crystallization of sintered tungsten bars is uneven, and the cross section appears Frame crystal, large crystal, poor product performance, poor consistency, low potassium content in tungsten bars, potassium content <80ppm, poor high temperature resistance, unstable quality, potassium content in tungsten bars fluctuates around 50-70ppm, it is difficult to control
[0005] 2. A large amount of alumina, potassium oxide, and silicon dioxide are added to tungsten oxide, which causes the enrichment of aluminum in the tungsten wire to form a brittle point, which affects the processing performance and low-temperature winding performance of the tungsten wire. Doped tungsten powder passes through hydrogen Fluoric acid pickling, resulting in the loss of doped tungsten powder and environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] After dissolving tungsten oxide and silicic acid in water, evaporate and crystallize to obtain the additive for tungsten wire production; the weight ratio of tungsten element and silicon element in the additive is 61.96:0.1.

[0025] A kind of tungsten wire production method of the present invention is as follows:

[0026] A, take the raw material of following parts by weight:

[0027] Tungsten oxide 4500 parts;

[0028] 0.8% additive by weight relative to tungsten oxide;

[0029] 1.5 parts of aluminum nitrate;

[0030] 3500 parts of water;

[0031] b. Put 4500 parts of tungsten oxide in the reactor, add 0.8% additives relative to the weight percentage of tungsten oxide, and then add; then add 3500 parts of water, stir evenly, and dry to obtain a raw material mixture;

[0032] c. The raw material mixture prepared above is reduced in a multi-tube furnace with hydrogen to produce doped tungsten powder. The dew point of hydrogen is -40°C, the flow rate of hydrogen is 1...

Embodiment 2

[0034] After dissolving tungsten oxide and silicate in water, evaporating and crystallizing, the additive for tungsten wire production is obtained; the weight ratio of tungsten element and silicon element in the additive is 61.96:1.1.

[0035] A kind of tungsten wire production method of the present invention is as follows:

[0036] A, take the raw material of following parts by weight:

[0037] Tungsten oxide 5500 parts;

[0038] 1.2% additive relative to tungsten oxide by weight;

[0039] 2.5 parts of aluminum nitrate;

[0040] 4500 parts of water;

[0041] b. Put 5,500 parts of tungsten oxide in the reactor, add 1.2% additive by weight relative to the tungsten oxide, and then add; add 4,500 parts of water, stir evenly, and dry to obtain a raw material mixture;

[0042] c. The raw material mixture prepared above is reduced in a multi-tube furnace with hydrogen to produce doped tungsten powder. The hydrogen dew point is -43°C, the hydrogen flow rate is 1.7 cubic meters pe...

Embodiment 3

[0044] After dissolving tungsten oxide and silicic acid in water, evaporate and crystallize to obtain the additive for tungsten wire production; the weight ratio of tungsten element and silicon element in the additive is 61.96:0.6.

[0045] A kind of tungsten wire production method of the present invention is as follows:

[0046] A, take the raw material of following parts by weight:

[0047] Tungsten oxide 4500~5500 parts;

[0048] 0.8-1.2% additives relative to the weight percentage of tungsten oxide;

[0049] 1.5-2.5 parts of aluminum nitrate;

[0050] 3500-4500 parts of water;

[0051] b. Put 5,000 parts of tungsten oxide in the reactor, add 1.0% additive by weight relative to the tungsten oxide, and then add; then add 4,000 parts of water, stir evenly, and dry to obtain a raw material mixture;

[0052] c. The raw material mixture prepared above is reduced in a multi-tube furnace with hydrogen to produce doped tungsten powder. The hydrogen dew point is -46°C, the hydro...

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PUM

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Abstract

The invention involves a tungsten filament production method and it special additives, the method includes the following steps: weighing certain tungsten oxide and putting into reactor, adding additives which weight percentage is 0.8 ~ 1.2% relative to tungsten oxide, adding aluminum nitrate; adding water and mixing uniform, drying; hydrogen gas deacidizing and preparing doping tungsten powder in multi-pipe furnace, the dew-point of hydrogen gas <=-40DEG C, the hydrogen gas flow is 1.5-1.7 m3 / h, load-canoe amount is 400-500 g, push-canoe velocity is 1.5-2.5 canoe / h, the first deacidizing temperature is 600-650DEG C and the second deacidizing temperature is 800-900DEG C, the prepared doping tungsten powder is produced to tungsten strip through profiling and one time incipient fusion sintering, then is produced to thermos table tungsten wire through pressure processing; the invention has advantages of high production efficiency, high content of potassium in tungsten filament, good resistant temperature property and free-fluohydric acid pollution.

Description

technical field [0001] The invention relates to a metal production method and its additives, in particular to a tungsten wire production method and its additives. Background technique [0002] At present, the method of producing high-temperature resistant tungsten wire at home and abroad generally adopts the following method, adding 0.03-0.1% of alumina, 0.3-0.55% of potassium oxide, and 0.3-0.4% of tungsten oxide to tungsten oxide. Silicon oxide, silicon dioxide and potassium oxide are added in the form of potassium silicate solution. Potassium silicate is formed by the reaction of potassium hydroxide and silicic acid. Aluminum oxide is added in the form of aluminum nitrate solution. Reduction of hydrogen in a tube furnace to produce doped tungsten powder requires: hydrogen dew point ≤ -40°C, hydrogen flow rate of 1.5-2.5 cubic meters per hour, boat loading capacity of 250-320 grams per boat, and boat pushing speed of 2 boats per hour , the primary reduction temperature is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F9/26
Inventor 刘占波
Owner 刘占波
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