CN1686825A - Method for preparing tungsten trioxide blue tungsten and tungsten powder in Nano grade - Google Patents
Method for preparing tungsten trioxide blue tungsten and tungsten powder in Nano grade Download PDFInfo
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- CN1686825A CN1686825A CN 200510011520 CN200510011520A CN1686825A CN 1686825 A CN1686825 A CN 1686825A CN 200510011520 CN200510011520 CN 200510011520 CN 200510011520 A CN200510011520 A CN 200510011520A CN 1686825 A CN1686825 A CN 1686825A
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Abstract
The present invention provides a preparation method of nano-grade superfine tungsten trioxide powder, nano-grade superfine tungsten blue and nano-grade superfine tungsten powder. Firstly, it adopts medium-pressure ultrasonic spray thermal conversion process to prepare precursor body amorphous powder as raw material, then utilizes vacuum ammonia-discharging and water-discharging treatment process to remove residual ammonia and unter, and uses O-R-III phase change stress disproportionation effect to repeatedly breake the oxide granules of tungsten, finally uses continuously-forced water-discharged reduction furnace to remove reaction produce water vapour so as to obtain the tungsten trioxide powder, tungsten blue powder and nano tungsten powder.
Description
Technical field
The invention belongs to metal W and oxide compound preparing technical field thereof, the preparation method of a kind of nano level superfine anhydrous wolframic acid powder, the blue tungsten powder of nano level superfine and nano level superfine tungsten powder particularly is provided, be applicable to the suitability for industrialized production of above-mentioned nano level superfine powder.
Background technology
The fusing point of tungsten is up to 3410 ℃, and height ranks first in all metals, and more valuable is that its boiling point is 5527 ℃, and vaporization heat is 799.4 (J/ml), and any metal hardly matches.Tungsten has high hot strength, high elastic coefficient and low-expansion coefficient simultaneously.Above characteristics have determined tungsten can become high temperature, the ultra-high temperature condition best materials of use down, so tungsten extensively is used to make various electric glowers, ultrahigh-temperature electric heating element, and heat-resisting part of ultrahigh-temperature and anti-radiation shielding material etc.
Every year only lighting filament domestic needs amount up to 450 tons.About 150 tons of tungsten electrical heating element (sheet material) year, about 170 tons of blunt tungsten ingot blank and massive article.In recent years along with hi-tech development to high performance tungsten plate, especially wide cut (＞700mm) big area book plate, super book paper tinsel band high performance and long service life antidetonation tungsten filament, increase etc. demand is anxious, the high quality tungsten sheet year requirement of using as DVD CD nickel plating tungsten boat surpasses 70 tons, solid-rocket jet pipe throat lining, high temperature resistant nose cone, jet vane ultrahigh-temperature transpiring materials etc., war products year, requirement was above 50 tons.In recent years because the conduction of tungstenalloy excellence, characteristics such as the heat dissipation characteristics and the coefficient of expansion are controlled are used to make substrate, heat pillow abaculus, encapsulation web member and heat dissipation element in large-scale integrated circuit and HIGH-POWERED MICROWAVES device.Because the high heat conduction and the resistance toheat of tungsten-copper alloy, improved the use power of microelectronic device greatly, can make device miniaturization, its coefficient of expansion can with the silicon chip in the microelectronic device, semiconductor materials such as gallium arsenide and base well mate with stupalith, so be the ideal packaged material.
China produces tungsten big country, and more than 20,000 ton of thick tungsten product outlet arranged every year, about 1000～1200 tons of the output of domestic pure tungsten metal products, and output is also at the forefront in the world, but on the production technology and intellecture property of high quality tungsten material, more abroad falls behind.Illustrate that new technology development is slower, but development of high-tech, requirement to pure tungsten and alloy material thereof is more and more high, other alloy material (as tungsten copper electrical alloy, tungsten ferronickel high-density alloy etc.) that no matter to tungsten filament, sheet material, foil or with tungsten is matrix has proposed homogeneous microstructure, the refinement of crystal grain ultra micro, the requirement of good plasticity
By nearly 15 years relevant literature search and in analyzing as can be known, present various countries all adopt particle diameter in production or development work be the tungsten powder of 3～5 μ m, with the tungsten material that this tungsten powder is made, its tungsten grain is grown up to (200～400) μ m by (3～5) μ m, is about 60～80 times of original tungsten grain.This thick tungsten grain has obviously reduced mechanical property, physicals, the pressure machining characteristics of pure tungsten material.In recent years, (≤100nm) tungsten powder, the technology of producing superfine crystal particle pure tungsten material and tungsten-bast alloys such as superfine crystal particle W-Cu, W-Ni-Fe has entered practicability, so the requirement of nano grade tungsten powder sharply increases to adopt the nano level superfine particle both at home and abroad.
Summary of the invention
The object of the present invention is to provide a kind of nano level tungstic oxide, the preparation method of blue tungsten and tungsten powder, can heavy industrialization serialization production median size be the nano level anhydrous wolframic acid powder of 35nm, blue tungsten powder and median size be the technology of preparing of the nano-tungsten powder of 33.5nm.
Presoma amorphous powder used in the present invention is that the presoma amorphous powder that adopts ullrasonic spraying thermal conversion method to produce is a raw material, handle through vacuum ammonia excretion draining earlier, can be made into nano level tungsten trioxide powder and the tungsten powder that median size is 35nm through O-R-III transformation stress disproportionation break process again.Again through continuous forced-ventilated ability of swimming reduction furnace, a H
2It is 33.5nm, meso-position radius 19.3nm, BET specific surface 23m that SAXS (X-ray Small angle granularity Detection) median size is made in reduction
2The nano-tungsten powder of/g.Concrete processing step is:
1, preparation presoma amorphous powder;
Adopt the high density ammonium tungstate aqueous solution, in ullrasonic spraying thermal conversion tower,, compressed air pressure 3MPa, 130 ℃～150 ℃ of hot blast temperatures, prepare the presoma amorphous powder of median size≤50nm earlier with the ultrasonic atomizing nozzle of α=45 ℃.
2, vacuum ammonia excretion, draining are handled;
The presoma amorphous powder (was being pressed 150 ℃, 40～45 minutes under 10～20Pa) vacuum tightnesss; 350 ℃, 30～40 minutes; Vacuum ammonia excretion draining in 500 ℃, 40～45 minutes is handled.
3, O-R-III transformation stress disproportionation break process;
Presoma amorphous powder after vacuum ammonia excretion, draining handled places in the retort furnace, and 500 ℃, 1 hour, oxide treatment (being called for short O handles) are then at forced-ventilated ability of swimming H continuously in the air
2Low temperature 400 ℃, 40～50 minutes, H in the reduction furnace
2Cross section flow 30～40ml/cm
2Divide, be reduced into blue tungsten powder, (being called for short R handles) above O-R handles three times repeatedly, being designated as O-R-III handles, purpose be utilize tungsten oxide compound in deoxidation and oxygenation phase transition process, in structure cell, produce huge crushing stress, can make the further broken refinement of oxide particle of tungsten.Obtaining median size after O-R-III handles is the WO of 35nm
3Powder or tungsten powder.
4, nano-tungsten powder preparation
With the blue tungsten powder of median size 35nm at forced-ventilated ability of swimming H continuously
2Reduce in the reduction furnace, by 700～730 ℃, 40～60 minutes, H
2Cross section flow 40～60ml/cm
2Divide, can obtain the SAXS median size is 33.5nm, meso-position radius 19.3nm, BET specific surface 23m
2The nano-tungsten powder of/g.
The invention has the advantages that:
1, the WO of the more than enough kind of a kind of energy ground serialization scale operation nano level median size 35nm is provided from production technology
3Powder and WO
2.9The new technology of the nanometer W powder of blue tungsten powder and median size 33.5nm.
2, the nano level superfine metal W powder of Sheng Chaning, not only median size is 33.5nm, meso-position radius is that the 19.5nm particle size distribution range is very narrow, only is 45nm.
3, equipment used is simple, technical process is short, and casting yield height, production cost are low, are easy to apply.
The nano-tungsten powder sintering temperature of 4, being produced is low, can carry out (sintering) under 1500 ℃ of temperature, and the relative density of alloy can reach 96%, and mean tungsten crystal grain is less than 8 μ m.
Description of drawings
Fig. 1 is preparation technology's schema of the present invention, wherein ullrasonic spraying thermal conversion legal system is equipped with presoma amorphous powder 1, handle 2 with the pusher vacuum tube furnace ammonia excretion of continuous helical, draining, carry out O-R-III break process 3, can obtain nanometer WO with retort furnace and forced-ventilated ability of swimming tubular type reduction furnace
3, WO
2.9Powder.With forced-ventilated ability of swimming H
2Reduction furnace prepares nano metal W powder 4, nanometer powder Performance Detection 5, the packing of product 6.
Embodiment
Embodiment 1: should follow these steps to finish during preparation 1.261kg nano level three oxygen tungsten powders
1, takes by weighing the presoma amorphous powder 1.855kg of ullrasonic spraying thermal conversion method preparation.
2,, put into the pusher vacuum oven of continuous helical, under vacuum tightness 10Pa, by 150 ℃, 40 minutes with presoma amorphous powder 1.855kg; 350 ℃, 40 minutes; 500 ℃, 40 minutes, carry out ammonia excretion, draining processing.Heat-up rate is 5 ℃/minute.
3, carrying out O-in 500 ℃, 1 hour in retort furnace, air handles
4,400 ℃, 60 minutes, H in continuous forced-ventilated ability of swimming reduction furnace
2Cross section flow 40～45ml/cm
2Divide, be reduced into the nanometer tungsten powder.More than 3,4 treatment process three times repeatedly, when O-disposes for the third time, can obtain the nanometer WO of (SAXS) median size 35nm
3Powder 1.261kg.
Embodiment 2: preparation 1.252kg during the nano level tungsten powder, should follow these steps to finish
1, takes by weighing the presoma amorphous powder 1.855kg of ullrasonic spraying thermal conversion method preparation
2, according to 1,2,3,4 treatment process among the embodiment 1, make the 1.261kg nanometer anhydrous wolframic acid powder earlier.
3, in continuous forced-ventilated ability of swimming reduction furnace, use H
2Gas was at 400 ℃, 45 minutes, H
2Cross section flow 50ml/cm
2Divide, under the condition with nanometer WO
3Powder, being reduced into (SAXS) median size is the (WO of 35nm
2.9) tungsten powder 1.252kg.
Embodiment 3: preparation 1kg should follow these steps to finish during nano grade tungsten powder.
1, takes by weighing the presoma amorphous powder 1.855kg of ullrasonic spraying thermal conversion method preparation
2, make the nano level tungsten powder of 1.252kg earlier according to 1,2,3 treatment process among the embodiment 2
3, with continuous forced-ventilated ability of swimming reduction furnace, at 700 ℃, 50 minutes, H
2Cross section flow 60ml/cm
2Divide, use H
2It is 33.5nm that the reduction tungsten powder can be made into the SAXS median size, and meso-position radius 19.3nm, BET specific surface are 23m
2The nano-tungsten powder of/g.
Claims (1)
1, the preparation method of a kind of nano level anhydrous wolframic acid powder, blue tungsten powder and tungsten powder, the presoma amorphous powder that uses is that the presoma amorphous powder that adopts ullrasonic spraying thermal conversion method to produce is raw material, handle through vacuum ammonia excretion draining earlier, make nano level tungsten trioxide powder and the tungsten powder that the SAXS median size is 35nm through O-R-III transformation stress disproportionation break process again; Again through continuous forced-ventilated ability of swimming reduction furnace, a H
2It is 33.5nm, meso-position radius 19.3nm, BET specific surface 23m that the SAXS median size is made in reduction
2The nano-tungsten powder of/g; It is characterized in that: concrete technology is:
A, preparation presoma amorphous powder;
Adopt the high density ammonium tungstate aqueous solution, in ullrasonic spraying thermal conversion tower,, prepare the presoma amorphous powder of median size≤50nm earlier with the ultrasonic atomizing nozzle of α=45 ℃, 130 ℃～150 ℃ of compressed air pressure 3MPa, hot blast temperatures;
B, vacuum ammonia excretion, draining are handled;
The presoma amorphous powder was pressed 150 ℃, 40～45 minutes under 10～20Pa vacuum tightness; 350 ℃, 30～40 minutes; Vacuum ammonia excretion draining in 500 ℃, 40～45 minutes is handled;
C, O-R-III transformation stress disproportionation break process;
Presoma amorphous powder with after vacuum ammonia excretion, the draining processing places in the retort furnace, 500 ℃, 1 hour oxide treatment in the air, and promptly O handles, then at continuous forced-ventilated ability of swimming H
2Low temperature 400 ℃, 40～50 minutes, H in the reduction furnace
2Cross section flow 30～40ml/cm
2Divide, be reduced into blue tungsten powder, promptly R handles, and above O-R handles three times repeatedly, and promptly O-R-III handles, and after O-R-III handled, obtaining the SAXS median size was the WO of 35nm
3Powder or tungsten powder.
D, nano-tungsten powder preparation
With the blue tungsten powder of median size 35nm at forced-ventilated ability of swimming H continuously
2Reduce in the reduction furnace, by 700～730 ℃, 40～60 minutes, H
2Cross section flow 40～60ml/cm
2Minute, obtaining the SAXS median size is 33.5nm, meso-position radius 19.3nm, BET specific surface 23m
2The nano-tungsten powder of/g.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302308A (en) * | 2013-06-17 | 2013-09-18 | 南昌大学 | Preparation method of nano tungsten powder |
| CN108516588A (en) * | 2018-04-20 | 2018-09-11 | 中南大学 | A method of preparing tungsten product from coarse sodium tungstate |
| CN108677037A (en) * | 2018-04-20 | 2018-10-19 | 中南大学 | A kind of method that acid decomposes wolframite extraction tungsten |
| WO2019061584A1 (en) * | 2017-09-30 | 2019-04-04 | 五邑大学 | Metal tungsten quantum dot preparation method |
| CN114393214A (en) * | 2022-01-20 | 2022-04-26 | 宁波江丰电子材料股份有限公司 | Ultra-pure spherical tungsten powder and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052071A (en) * | 1989-11-28 | 1991-06-12 | 中南工业大学 | From ammonium tungstate solution, produce the method for fine and ultrafine tungsten powder |
| DE10043792A1 (en) * | 2000-09-06 | 2002-03-14 | Starck H C Gmbh | Ultra-coarse, single-crystalline tungsten carbide and process for its manufacture; and carbide made from it |
| US6478845B1 (en) * | 2001-07-09 | 2002-11-12 | Osram Sylvania Inc. | Boron addition for making potassium-doped tungsten |
| CN1480282A (en) * | 2003-07-22 | 2004-03-10 | 北京科技大学 | Method for preparing nano superfine tungsten powder |
-
2005
- 2005-04-01 CN CNB2005100115203A patent/CN1297486C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103302308A (en) * | 2013-06-17 | 2013-09-18 | 南昌大学 | Preparation method of nano tungsten powder |
| WO2019061584A1 (en) * | 2017-09-30 | 2019-04-04 | 五邑大学 | Metal tungsten quantum dot preparation method |
| CN108516588A (en) * | 2018-04-20 | 2018-09-11 | 中南大学 | A method of preparing tungsten product from coarse sodium tungstate |
| CN108677037A (en) * | 2018-04-20 | 2018-10-19 | 中南大学 | A kind of method that acid decomposes wolframite extraction tungsten |
| CN108516588B (en) * | 2018-04-20 | 2020-07-31 | 中南大学 | Method for preparing tungsten product from crude sodium tungstate solution |
| CN114393214A (en) * | 2022-01-20 | 2022-04-26 | 宁波江丰电子材料股份有限公司 | Ultra-pure spherical tungsten powder and preparation method thereof |
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| CN1297486C (en) | 2007-01-31 |
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Assignee: Hangzhou Zhengchida Precision Machinery Co., Ltd. Assignor: University of Science and Technology Beijing Contract fulfillment period: 2009.6.25 to 2014.6.24 contract change Contract record no.: 2009330001984 Denomination of invention: Method for preparing nano grade tungsten powder Granted publication date: 20070131 License type: Exclusive license Record date: 2009.8.17 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.6.25 TO 2014.6.24; CHANGE OF CONTRACT Name of requester: HANGZHOU ZHENGCHIDA PRECISION MACHINERY CO., LTD. Effective date: 20090817 |
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Granted publication date: 20070131 Termination date: 20140401 |