CN1140366C - Solid atomizing process for molten metal and alloy - Google Patents
Solid atomizing process for molten metal and alloy Download PDFInfo
- Publication number
- CN1140366C CN1140366C CNB01106868XA CN01106868A CN1140366C CN 1140366 C CN1140366 C CN 1140366C CN B01106868X A CNB01106868X A CN B01106868XA CN 01106868 A CN01106868 A CN 01106868A CN 1140366 C CN1140366 C CN 1140366C
- Authority
- CN
- China
- Prior art keywords
- powder
- solid
- alloy
- granularity
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The present invention relates to a solid atomizing process for molten metal and alloy. The process of the present invention comprises the following steps: liquid metal or alloy is atomized by the high-speed airflow containing high-concentration soluble solid medium granules; the solid granules and metal powder are separated via washing, filtration and drying; compared with powder prepared by a traditional two-stream atomization method, the obtained powder has the advantages of fine granularity, narrow distribution of powder granularity and high cooling speed; solid medium granules have the advantages of higher flow speed and finer granularity along with the increase of the flow quantity, and the granularity of atomized powder can be finer. The present invention is suitable for preparing different kinds of non-ferrous metal powder, injection forming powder and rapid condensation powder.
Description
[technical field] the present invention relates to a kind of atomization production of Metal and Alloy powder, belongs to metallurgical and material and engineering field.
The second-rate atomization of [background technology] metal liquid is directly to smash liquid metals or alloy by high velocity air or High-Pressure Water and make the method for powder.This method is simple, cost is low, the productivity ratio height, easily be automated, the powder of second-rate atomization production accounts for 30～50% in the whole world powder output at present, and it is one of most important milling method of powder metallurgy (" an atomization production metal dust ", J.K. pattra is outstanding, Hu Yunxiu, Cao Yongjia translate, metallurgical industry publishing house, 1985).But the crushing efficiency of this technology, be that the energy utilization rate is not very high, atomization process high speed air-flow or current only less than 1% kinetic energy be converted into broken powder particle the surface can, powder size is difficult to further refinement, cooling velocity also is difficult to improve.
[summary of the invention] the invention provides a kind of atomization production of Metal and Alloy powder at above-mentioned deficiency.
The present invention adopts the high velocity air that contains solid medium particle that liquid metals or alloy are atomized, high speed solid and gas mixed flow sprays from atomizer, directly smash liquid metals or alloy and make powder, powder falls into the water, by cleaning, filter and drying, solid medium particle is separated with metal dust, described solid dielectric is for being easy to and powder separation, the solid particle that the thermal capacity of thermal capacity and thermal conductivity ratio water and thermal conductivity factor are high, as NaCl, KCl, organic matter or inorganic matter that urea and other can be water-soluble.
Under equal gas pressure and flow, the powder that the powder that adopts the high-speed gas atomization that contains solid particle to make makes than the high-speed gas atomization that does not contain solid particle, fine size, and powder size narrowly distributing, the powder cooling velocity is big.The flow of solid medium particle is bigger, and flow velocity is faster, and granularity is thinner, and then the atomized powder granularity is thinner.Adopt the gases at high pressure dense-phase pneumatic conveying device to be used for solid atomizing,, produce the solid particle flows of high concentration, high flow rate to increase the solid-gas ratio of under high pressure draught, carrying stream, but the attritive powder of the various granularities of mass preparation.
The present invention is with compressed air or high-pressure inert gas such as the nitrogen carrier gas stream as the solid atomizing media particle.
The present invention is suitable for preparing various nonferrous metal powders, injection moulding powder and rapid condensation powder.
Compared with prior art, the present invention has following characteristics:
(1) powder size that makes is thin, and the powder size narrowly distributing.Highdensity solid particle flows of kinetic energy and metal liquid stream collision can improve energy transformation ratio and atomizing crushing efficiency, prepare refining metallic powder.
(2) the powder cooling rate that makes is higher.Because physical function parameters such as the coefficient of heat conduction of solid dielectric such as NaCl, KCl etc., density, specific heat are all far above gas or water, therefore the interfacial heat transfer coefficient between liquid metals and solid dielectric is more much bigger than gas and aqueous medium, so solid particle is as cooling medium, its cooling capacity is more much better than than water and gas, and the prepared powder cooling velocity of solid atomizing is big.
(3) solid particle as the thermal coefficient of expansion of NaCl, KCl than the expansion of metal coefficient much bigger, the rapid heating of sodium salt and sylvite easily produces the explosion phenomenon.The explosion of salt is favourable to the atomizing fragmentation of powder, and makes the phenomenon of metal bath parcel salt be difficult to take place.
(4) solid atomizing comes down to contain the atomizing of the high velocity air of high concentrated, solid medium to metal and alloy, is a kind of the simplest and practical attritive powder method of producing, and is fit to preparation various nonferrous metal powders, injection moulding powder and rapid condensation powder.
Description of drawings: Fig. 1: the microstructure of gained powder of the present invention, amplify 1600 times.
[specific embodiment]
1. adopt commercial NaCl (salt) powder particle as the solid atomizing medium, being delivered to circumferential weld restraint-type atomizer with air compressor or nitrogen bus-bar atomizes and makes the metal or alloy powder, powder falls into the water, and separates with salt by cleaning, filter with dry back.The salt granularity is 300～400 μ m in this experiment, and the high velocity air pressure of air compressor output is 0.8Mpa, and air mass flow is 6m
3/ min; The stream pressure of nitrogen bus-bar is 0.8～1.0MPa, and nitrogen flow is 3.3m
3/ min.The overtemperature of liquid metals or alloy is 150～200K, and the liquid flow diameter is 3.5～3.8mm, and the salt flow is 1.5～4.0kg/min.
Table 1 is the comparison through gas atomization and salt atomizing gained powder size of several liquid metals and alloy, and table 3 is two kinds of comparisons that the obtained powder size of method distributes.In carrying out two kinds of contrast tests, the metal liquid overtemperature, liquid flow diameter, nozzle are all identical.Experimental result shows that the powder size that the salt atomizing makes is much thin, and the powder size narrowly distributing.The flow of salt is bigger simultaneously, and flow velocity is faster, and granularity is thinner, and then the atomized powder granularity is thinner.In general, the flow of salt and flow velocity depend on the flow and the pressure of current-carrying gas.The pressure of air compressor is 0.8MPa, and air mass flow is 6m
3/ min, nitrogen bus-bar pressure is 0.8MPa, nitrogen flow is 3.3m
3/ min, the transmission jar of employing same volume and identical salt, two kinds of feeder unit interval send the salt amount to be respectively 4kg/min and 2.1kg/min, and the former Al-12wt%Si powder mean particle sizes is 42.73 μ m, and latter's powder size is 60.42 μ m.Both particle mean sizes differ more.In addition, under identical gas supply flow, the pressure of current-carrying gas is higher, and the flow velocity of salt is also higher, and bump metal liquid stream kinetic energy is bigger, and the atomizing ability is stronger.
Fig. 1 is the microstructure of salt atomizing gained powder.Photo shows that in the microstructure of salt atomizing Al-Si eutectic powder, the granularity of primary silicon is tiny, and the secondary dendrite spacing arm has only 1 μ m, can estimate that according to secondary dendrite spacing arm and cooling velocity relation its cooling rate is about 10
4～10
5K/s.
After adopting NaCl that powder is atomized, the remaining salt ratio of powder is easier to clean, and simply cleans, and filters and drying, and the remaining Na ion concentration of powder is very low, and this powder is deposited and do not found salt pair powder corrosion phenomenon more than the some months.The solid salt atomized powder is through secondary cleaning, and Na ion concentration fundamental sum atomized powder is identical.Table 2 is the variation of salt atomizing powder Na ion concentration after cleaning.
Comparative sample title sample number into spectrum particle mean size (μ m) Fisher particle size (μ m) spray pattern of table 1 gas atomization and the obtained powder size of solid atomizing
*Al-12wt%Si 1-1 88.22 29.19 gas atomization Al-12wt%Si 1-2 42.73 13.27 solid atomizings
Pb 2-1 79.44 8.65 gas atomizations
Pb 2-2 45.41 4.06 solid atomizings
Sn 3-1 78.18 15.39 gas atomizations
Sn 3-2 36.69 7.26 solid atomizings
Zn 4-1 76.42 8.64 gas atomizations
Zn 4-2 44.30 3.89 solid atomizing * gas atomizations: gas pressure 0.8MPa, gas flow 6m
3/ min; Solid atomizing: gas pressure 0.8MPa, gas flow 6m
3/ min, salt flow 4kg/min.
The Na ion concentration of table 2 salt atomized powder after cleaning
Na ion concentration (wt%) sample title sample number into spectrum
Once clean secondary cleaning Al-12Wt%Si (g) 2-1 0.016%Al-12Wt%Si (s) 2-2 0.052% 0.012%
Sn(g) 3-1 0.05％
The comparison that Sn (s) 3-2 0.026% 0.004% table 3 gas atomizations and the obtained powder size of solid atomizing (μ m) distribute (percentage by weight, wt%)
Composition sample number into spectrum 0～10 10～30 30～50 50～70 70～100 100～150＞150Al-12wt%Si (g) 1-1 1.78 8.73 16.20 14.50 17.56 18.40 23.83Al-12wt%Si (s) 1-2 8.84 25.16 25.60 16.40 13.00 8.10 2.90
Pb(g) 2-1 2.80 12.86 16.65 13.91 15.70 17.80 20.28
Pb(s) 2-2 10.51 23.79 20.79 12.51 12.13 8.87 12.00
Sn(g) 3-1 1.18 12.07 16.80 15.85 16.49 13.61 24.00
Sn(s) 3-2 12.92 29.37 22.03 11.43 10.00 6.65 7.60
Zn(g) 4-1 2.19 9.89 19.26 15.83 19.07 15.86 17.90
Zn (s) 4-2 9.68 23.89 24.82 13.45 13.18 8.14 6.84g-gas atomizations, gas pressure 0.8MPa, gas flow 6m
3/ min; The s-solid atomizing, gas pressure 0.8MPa, gas flow 6m
3/ min, salt flow 4kg/min.
Claims (2)
1. the atomization method of liquid metals and alloy, the high velocity air that employing contains solid medium particle atomizes to liquid metals or alloy, high speed solid and gas mixed flow sprays from atomizer, directly smash liquid metals or alloy and make powder, powder falls into the water, by cleaning, filter and drying, solid medium particle is separated with metal dust, it is characterized in that: described solid dielectric is for being easy to and powder separation the thermal capacity of thermal capacity and thermal conductivity ratio water and the high solid particle of thermal conductivity factor.
2. method according to claim 1 is characterized in that: described solid dielectric is NaCl, KCl, organic matter or inorganic matter that urea and other can be water-soluble.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01106868XA CN1140366C (en) | 2001-02-13 | 2001-02-13 | Solid atomizing process for molten metal and alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01106868XA CN1140366C (en) | 2001-02-13 | 2001-02-13 | Solid atomizing process for molten metal and alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1369339A CN1369339A (en) | 2002-09-18 |
| CN1140366C true CN1140366C (en) | 2004-03-03 |
Family
ID=4655830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01106868XA Expired - Fee Related CN1140366C (en) | 2001-02-13 | 2001-02-13 | Solid atomizing process for molten metal and alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1140366C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106312085B (en) * | 2015-06-29 | 2018-12-04 | 鞍钢股份有限公司 | A method of improving water-atomized iron powder or comminuted steel shot fine powder rate |
| CN114101690B (en) * | 2021-11-17 | 2023-02-17 | 北京理工大学 | Device based on gas-solid coupling atomization preparation metal powder |
| CN114309629A (en) * | 2021-12-28 | 2022-04-12 | 云航时代(重庆)科技有限公司 | Gas-solid two-phase atomization method for superfine spherical hydrogen storage metal or alloy powder thereof |
-
2001
- 2001-02-13 CN CNB01106868XA patent/CN1140366C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1369339A (en) | 2002-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103785860B (en) | Metal dust of 3D printer and preparation method thereof | |
| CN1073481C (en) | Production of powder | |
| CN1951861B (en) | Method for making high purity and free flowing metal oxides powder | |
| CN103480854B (en) | A kind of method of preparing submicron metal | |
| CN205414417U (en) | Device of plasma atomizing preparation high performance powder for vibration material disk | |
| US4731111A (en) | Hydrometallurical process for producing finely divided spherical refractory metal based powders | |
| CN111954581A (en) | Method and device for producing fine spherical powder from coarse and angular powder feed | |
| CN1422718A (en) | Method and apparatus for making globular metallic powder by ultrasonic atomising | |
| CN1085143A (en) | Decompose the method for making silver powder by aerosol | |
| CN102029551A (en) | Lubricating and cooling method for cutting process and device thereof | |
| CN110480024A (en) | A method of CuCrZr spherical powder is prepared based on VIGA technique | |
| JPS63243211A (en) | Wet metallurgical method for producing finely divided globular noble metal base powder | |
| KR102546750B1 (en) | Method for producing atomization of high melting point metal or alloy powder | |
| US4508788A (en) | Plasma spray powder | |
| CN1140366C (en) | Solid atomizing process for molten metal and alloy | |
| JP6908706B2 (en) | Low melting point metal or alloy powder atomizing manufacturing process | |
| CN112846207A (en) | Preparation method of superfine active zinc powder | |
| CN109448979B (en) | Method for directly preparing alumina coated ferrite by high-pressure ultrasonic spray thermal decomposition method | |
| CN1657203A (en) | Nonferrous metal powder | |
| JPS63307201A (en) | Wet metallurgical method for producing finely divided iron base powder | |
| JPH11323411A (en) | Low melting point metal powder and its production | |
| CN111558725A (en) | Method for producing atomized iron powder by spraying after reduction of scrap steel | |
| US4723993A (en) | Hydrometallurgical process for producing finely divided spherical low melting temperature metal based powders | |
| CN1762901A (en) | Nanostructured yttrium stable zirconium oxide agglomerate type powder and its production method | |
| CN111763938A (en) | High-hardness material coating structure and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |