CN102114544A - Method for preparing tungsten powder having uniform size distribution as well as excellent degree of sphericity and dispersity - Google Patents
Method for preparing tungsten powder having uniform size distribution as well as excellent degree of sphericity and dispersity Download PDFInfo
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- CN102114544A CN102114544A CN 201110086338 CN201110086338A CN102114544A CN 102114544 A CN102114544 A CN 102114544A CN 201110086338 CN201110086338 CN 201110086338 CN 201110086338 A CN201110086338 A CN 201110086338A CN 102114544 A CN102114544 A CN 102114544A
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Abstract
The invention provides a method for preparing tungsten powder having uniform size distribution as well as excellent degree of sphericity and dispersity and belongs to the field of powder preparation. According to the method, a high-speed gas is used for driving grains to mutually impact; the agglomerated grains are dispersed under the action of a shearing force generated in the impacting process; a selecting wheel is used for grading the grains; the grains are separated under the action of whirlwind; and the technical parameters are confirmed according to different powder granularities and agglomerating degrees, thereby acquiring the superfine powder having narrow size distribution, excellent dispersity and average grain size of 0.5-10 mu m. Compared with the traditional method, the method provided by the invention has higher efficiency; the rate of output is above 95%; the purity of powder is above 99.7%; and the production cost is reduced by 40-70%. The method provided by the invention has the advantages of high production efficiency, short period, low production cost, high product quality, high purity, and the like, and is an ideal method for solving the problem of agglomerating and grading the difficultly-melted tungsten powder.
Description
Technical field
The invention belongs to field of powder metallurgy, a kind of method for preparing the good tungsten powder of fine granularity, narrow size distribution, dispersive property and sphericity is provided.
Background technology
Fusing point of tungsten (3390～3423 ℃) and boiling point (5700 ± 200 ℃) are the highest in various metals, and its vapour pressure is minimum in all metals, and in addition, tungsten also has high density (19.3g/m
3), high elastic modelling quantity and intensity and low a series of excellent specific properties such as thermal coefficient of expansion, occupy critical role in engineering applications such as modern national defense, atomic energy industry, electrovacuum, electric light sources, in some special high-temperature applications even have the effect of not replacing.
The develop rapidly of modern PM technique and powdered metallurgical material, to dispersive property the proposition of the refractory metal material powder of the good and fine granularity of good sphericity, narrow size distribution increasing demand.For example, fields such as POROUS TUNGSTEN negative electrode, thermal spraying, injection moulding just need the thin tungsten powder of even particle size distribution and sphericity and good dispersion, or the like.But along with reducing of tungsten powder particles size, its specific area and surface can increase, and powder particle is reunited easily, thereby loses the function that fine grained has, and its application is restricted.Therefore, how to obtain that particle diameter is evenly distributed and the thin tungsten powder of sphericity and good dispersion has been subjected to scientific worker's attention day by day.
Summary of the invention
The purpose of this invention is to provide a kind of method for preparing the good tungsten powder of fine granularity, narrow size distribution, dispersive property and sphericity, satisfy the demand of modern PM technique and powdered metallurgical material development such tungsten powder.
Realization principle of the present invention is: at first utilize high-speed eddy gas to drive the tungsten powder particles motion, make and bump the building between the powder particle mutually, the shearing force that produces when utilizing particle to bump the building, reach and grind the also purpose of agglomerated particle dispersion, then by turbine classifier with the powder particle classification, thereby obtain the fine powder of narrow particle size distribution and dispersed and good sphericity.The present invention adopts the collision type airflow milling as testing equipment.
A kind ofly prepare that particle diameter is evenly distributed and the method for the tungsten powder of sphericity and good dispersion, technical process comprises:
1. cleaning equipment and charge into gas shield, working gas can be N
2, inert gases such as Ar, He;
2. air-flow disperses, and sets suitable powder feeding rate 1-20kg/ hour, grinding chamber gas pressure 0.1-1.0 Mpa, inlet gas pressure 0.01-0.5 Mpa;
3. turbine classification, the powder after the fragmentation is mobile to exporting out with air-flow, and by separation wheel, satisfactory fine grained is separated, and coarse granule continues to grind by sliding back milling zone on the wall, till separated.The rotating speed of separator is 2500-7000 rev/mins, decides according to granularity;
4. feed separation and collection: the material after sorting is separated with bag filter by cyclone separator and collects.
Maximum characteristics of the present invention are:
1. can to obtain particle mean size be the good dispersion of 0.5-10 μ m and the thin tungsten powder of narrow diameter distribution to this method;
2. this method production efficiency height, the cycle is short, and output capacity has reduced by 40-70% up to more than 95% than the produced in conventional processes cost.
3. the whole process of this method is carried out in atmosphere, and utilizes particle self collision, does not have impurity to introduce, and obtains powder purity more than 99.7%.
Description of drawings
Fig. 1 is that the particle diameter of embodiment 1 raw material tungsten powder distributes;
Fig. 2 is the stereoscan photograph of embodiment 1 raw material tungsten powder;
Fig. 3 is that the particle diameter of the tungsten powder that obtains of embodiment 1 distributes;
Fig. 4 is the tungsten powder stereoscan photograph that embodiment 1 obtains.
The specific embodiment
Embodiment 1:
Present embodiment is the ultra-fine reunion tungsten powder of 3 μ m for disperseing particle mean size
1. cleaning equipment and charge into nitrogen protection: start compressor pressure and be adjusted to 0. 5Mpa; And feeding nitrogen, the nitrogen supply pressure is 0.3Mpa; Clean entire equipment, main shaft cleaning pressure 0.2 Mpa, separation wheel master cleaning pressure 0.25Mpa; Making the interior feeding of equipment nitrogen protection powder be difficult for oxidized and the oxygen content maximum is set is 1%;
2. air-flow disperses: start successively and grind gas trap, separator, dynamic deoxygenation.Inlet gas pressure is transferred to 0.005 Mpa, grinds gas pressure and be transferred to 0.65Mpa, powder feeding rate 2kg/ hour.The normal back of equipment starts feed arrangement, opens feed valve, sends into raw material tungsten powder 10Kg.Material after disperseing is sent into classification mechanism with air-flow by pulverizing chamber;
3. turbine classification: the powder after the fragmentation is mobile to exporting out with air-flow, and by separation wheel, regulating the separator rotating speed is 5500 rev/mins, and satisfactory powder is separated, and coarse granule continues to grind by sliding back milling zone on the wall, till separated;
4. feed separation and collection: the cyclone separator that the material after handling through classification enters in the gathering-device carries out gas, the solid separation, and isolated powder enters firsts and seconds respectively and receives the powder chamber, then by two butterfly valves receipts powder.
Present embodiment obtains the ultrafine tungsten powder 9.83Kg that particle mean size is the good dispersion narrow diameter distribution of 2.906 μ m altogether, and Fig. 3,4 is respectively the particle diameter distribution stereoscan photograph of the tungsten powder that obtains of embodiment 1.
Embodiment 2:
Present embodiment is the ultra-fine reunion tungsten powder of 5 μ m for disperseing particle mean size
1. cleaning equipment and charge into nitrogen protection: start compressor pressure and be adjusted to 0. 45Mpa; And feeding nitrogen, the nitrogen supply pressure is 0.3Mpa; Clean entire equipment, main shaft cleaning pressure 0.2 Mpa, separation wheel master cleaning pressure 0.25Mpa; Making the interior feeding of equipment nitrogen protection powder be difficult for oxidized and the oxygen content maximum is set is 1%;
2. air-flow disperses: start successively and grind gas trap, separator, dynamic deoxygenation.Inlet gas pressure is transferred to 0.005 Mpa, grinds gas pressure and be transferred to 0.7Mpa, powder feeding rate 2kg/ hour.The normal back of equipment starts feed arrangement, opens feed valve, sends into raw material tungsten powder 5Kg.Material after disperseing is sent into classification mechanism with air-flow by pulverizing chamber;
3. turbine classification: the powder after the fragmentation is mobile to exporting out with air-flow, and by separation wheel, regulating the separator rotating speed is 5000 rev/mins, and satisfactory powder is separated, and coarse granule continues to grind by sliding back milling zone on the wall, till separated;
4. feed separation and collection: the cyclone separator that the material after handling through classification enters in the gathering-device carries out gas, the solid separation, and isolated powder enters firsts and seconds respectively and receives the powder chamber, then by two butterfly valves receipts powder.
Present embodiment obtains the ultrafine molybdenum powder 4.91Kg that particle mean size is the good dispersion narrow diameter distribution of 5.013 μ m altogether
Embodiment 3:
Present embodiment is the ultra-fine reunion tungsten powder of 1.5 μ m for disperseing particle mean size
1. cleaning equipment and charge into nitrogen protection: start compressor pressure and be adjusted to 0. 5Mpa; And feeding nitrogen, the nitrogen supply pressure is 0.3Mpa; Clean entire equipment, main shaft cleaning pressure 0.2 Mpa, separation wheel master cleaning pressure 0.25Mpa; Making the interior feeding of equipment nitrogen protection powder be difficult for oxidized and the oxygen content maximum is set is 1%;
2. air-flow disperses: start successively and grind gas trap, separator, dynamic deoxygenation.Inlet gas pressure is transferred to 0.005 Mpa, grinds gas pressure and be transferred to 0.6Mpa, powder feeding rate 2kg/ hour.The normal back of equipment starts feed arrangement, opens feed valve, sends into raw material tungsten powder 5Kg.Material after disperseing is sent into classification mechanism with air-flow by pulverizing chamber;
3. turbine classification: the powder after the fragmentation is mobile to exporting out with air-flow, and by separation wheel, regulating the separator rotating speed is 6500 rev/mins, and satisfactory powder is separated, and coarse granule continues to grind by sliding back milling zone on the wall, till separated;
4. feed separation and collection: the cyclone separator that the material after handling through classification enters in the gathering-device carries out gas, the solid separation, and isolated powder enters firsts and seconds respectively and receives the powder chamber, then by two butterfly valves receipts powder.
Present embodiment obtains the ultrafine tungsten powder 4.87Kg that particle mean size is the good dispersion narrow diameter distribution of 1.281 μ m altogether.
Claims (1)
1. one kind prepares that particle diameter is evenly distributed and the method for the tungsten powder of sphericity and good dispersion, it is characterized in that
Preparation process is:
A. cleaning equipment and charge into gas shield; Working gas is N
2Or Ar, He inert gas;
B. air-flow disperses, and the powder feeding rate of setting is 1-20kg/ hour, and the grinding chamber gas pressure is 0.1-1.0 Mpa, and inlet gas pressure is 0.01-0.5 Mpa;
C. turbine classification, the powder after the fragmentation is mobile to exporting out with air-flow, and by separation wheel, satisfactory fine grained is separated, and coarse granule continues to grind by sliding back milling zone on the wall, till separated; The rotating speed of separator is 2500-7000 rev/mins, decides according to granularity;
D. feed separation and collection: the material after sorting is separated with bag filter by cyclone separator and collects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110086338 CN102114544A (en) | 2011-04-07 | 2011-04-07 | Method for preparing tungsten powder having uniform size distribution as well as excellent degree of sphericity and dispersity |
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| CN 201110086338 CN102114544A (en) | 2011-04-07 | 2011-04-07 | Method for preparing tungsten powder having uniform size distribution as well as excellent degree of sphericity and dispersity |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107433335A (en) * | 2017-08-18 | 2017-12-05 | 山东融金粉末科技有限公司 | A kind of preparation method of 38 μm of iron powders |
| CN108465817A (en) * | 2018-03-15 | 2018-08-31 | 北京矿冶科技集团有限公司 | A kind of high-compactness pure tungsten article fabrication methods of even tissue |
| CN108907220A (en) * | 2018-08-09 | 2018-11-30 | 蓬莱市超硬复合材料有限公司 | A kind of Novel super-thin and nano-tungsten powder preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050132843A1 (en) * | 2003-12-22 | 2005-06-23 | Xiangyang Jiang | Chrome composite materials |
| CN1739894A (en) * | 2005-09-15 | 2006-03-01 | 自贡硬质合金有限责任公司 | Airflow crushing stepped tungsten carbide powder producing process |
| CN101003092A (en) * | 2006-11-27 | 2007-07-25 | 北京矿冶研究总院 | Cobalt-tungsten carbide thermal spraying powder with high cobalt content and preparation technology thereof |
| CN101569931A (en) * | 2009-04-17 | 2009-11-04 | 上海应用技术学院 | Method for preparing superfine tungsten powder |
-
2011
- 2011-04-07 CN CN 201110086338 patent/CN102114544A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050132843A1 (en) * | 2003-12-22 | 2005-06-23 | Xiangyang Jiang | Chrome composite materials |
| CN1739894A (en) * | 2005-09-15 | 2006-03-01 | 自贡硬质合金有限责任公司 | Airflow crushing stepped tungsten carbide powder producing process |
| CN101003092A (en) * | 2006-11-27 | 2007-07-25 | 北京矿冶研究总院 | Cobalt-tungsten carbide thermal spraying powder with high cobalt content and preparation technology thereof |
| CN101569931A (en) * | 2009-04-17 | 2009-11-04 | 上海应用技术学院 | Method for preparing superfine tungsten powder |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107433335A (en) * | 2017-08-18 | 2017-12-05 | 山东融金粉末科技有限公司 | A kind of preparation method of 38 μm of iron powders |
| CN108465817A (en) * | 2018-03-15 | 2018-08-31 | 北京矿冶科技集团有限公司 | A kind of high-compactness pure tungsten article fabrication methods of even tissue |
| CN108465817B (en) * | 2018-03-15 | 2020-05-12 | 北京矿冶科技集团有限公司 | Preparation method of high-density pure tungsten product with uniform structure |
| CN108907220A (en) * | 2018-08-09 | 2018-11-30 | 蓬莱市超硬复合材料有限公司 | A kind of Novel super-thin and nano-tungsten powder preparation method |
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Application publication date: 20110706 |