CN104070175B - Method for producing metal molybdenum spherical fine powder or superfine powder - Google Patents
Method for producing metal molybdenum spherical fine powder or superfine powder Download PDFInfo
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- CN104070175B CN104070175B CN201410305472.8A CN201410305472A CN104070175B CN 104070175 B CN104070175 B CN 104070175B CN 201410305472 A CN201410305472 A CN 201410305472A CN 104070175 B CN104070175 B CN 104070175B
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Abstract
The invention discloses a method for producing metal molybdenum spherical fine powder or superfine powder. The method comprises step 1, performing gas exchange on a production device to enable the original gas in the production device to be completely discharged; step 2, feeding the working gas and the auxiliary gas into a heating cylinder body through an insulation end cover; step 3, starting an electrical system to enable an induction coil to be energized and forming a gradient temperature field inside the heating cylinder body; step 4, adding molybdenum oxide powder into a spiral powder feeder when the circulating water is led into a first stage powder collecting tank, starting a first motor to drive the spiral powder feeder to run and leading the powder carried gas into a gas pipe, wherein the powder carried gas is hydrogen; step 5, shutting down the first motor and the electrical system and cutting off the supply of the powder carried gas, the auxiliary gas and the working gas. According to the method for producing the metal molybdenum spherical fine powder or superfine powder, the degree of sphericity of the molybdenum powder is improved, the integral process can be performed in a continuous and closed mode, the design is reasonable, the equipment is simple, the control is easy, the response speed is high, the production efficiency is high, and the method is suitable for mass production.
Description
Technical field
The invention belongs to field of powder metallurgy, be specifically related to a kind of method preparing metal molybdenum ball-shaped micro powder or superfine powder.
Background technology
The spherical powder of refractory metal molybdenum is widely used at field tools such as thermal spraying, injection moulding, powder metallurgy and welding due to excellent mobility and high apparent density.Use porous molybdenum framework material prepared by spherical molybdenum powder, its hole link, can ensure that the infiltration channels open of molybdenum skeleton, prepare the molybdenum-copper material of even tissue, the molybdenum copper contact material structure using spherical molybdenum powder to prepare is uniform, and ablation degree is basically identical, can prevent from producing local transition ablation because material structure is uneven or puncturing, improve the performance of molybdenum-copper contact, improve its life-span.Spherical molybdenum powder is big because of its good fluidity, apparent density, the coating that spraying obtains evenly, fine and close and there is good wearability.Because of good fluidity, the Song Bi great of spherical molybdenum powder, in powder metallurgy molybdenum product produces, pressed compact shrinks uniformly when sintering, and shrinkage factor is little, can realize good size Control, it is thus achieved that the following process of preferable sintered body material, beneficially sintered blank.It addition, spherical molybdenum powder is applied to nearly forming technology, molybdenum shaped piece can be prepared, improve the utilization rate of raw material, significantly reduce processing cost.
At present, the spheronization process of molybdenum powder mainly has spray granulation, atomization, rotary electrode method etc..The spherical molybdenum powder rough of spray granulation production, poor fluidity, pine ratio are low, additionally, organic binder bond is introduced during preparation spraying slip, easily material is formed the pollution of the elements such as C, O, introduce organic binder bond, need the linking of the techniques such as follow-up binder removal, sintering, extend technological process, improve production cost；Water atomization technique is prepared spherical powder and is easily formed metal-oxide, and gas atomization is easily formed inside disjunctor granule and granule and has pore, and these uses follow-up to powder are all disadvantageous；Spherical powder is prepared with rotary electrode method, because the restriction of electrode rotating speed, powder size prepared by rotation electrode technique is thicker, generally higher than 100 mesh, and bulky grain metal dust is difficult to melt during the follow-up use of powder, easily " half-cooked ", finally affecting the performance of goods, and atomization plant and plasma apparatus are invested huge, yield is relatively low, causing product cost to remain high, impact is promoted.
Summary of the invention
For defect or deficiency present in above-mentioned prior art, it is an object of the invention to, it is provided that a kind of method preparing metal molybdenum ball-shaped micro powder or superfine powder.The present invention adopts the following technical scheme that
A kind of method preparing metal molybdenum ball-shaped micro powder or superfine powder, specifically includes following steps:
1) preparation facilities is carried out gas displacement so that it is interior original gas is completely exhausted out；
2) in heating cylinder, working gas and auxiliary gas are sent into through working gas entrance and auxiliary gas entry；Working gas, auxiliary gas all use hydrogen；
3) opening electrical system makes the induction coil on heating cylinder be energized, and is internally formed gradient temperature field at heating cylinder；
4) it is passed through recirculated water to one-level powder body collecting tank, adds molybdenum oxide powder body to packing auger simultaneously, open the first motor and drive packing auger to run；Being passed through powder body from trachea and carry gas, powder body carries gas and uses hydrogen；Powder body carries gas and carries the molybdenum oxide powder body exported by packing auger, successively through powder body uniforming device and powder feeding gas tube, it is transported in heating cylinder, molybdenum oxide powder body reacts at heating cylinder, obtains spherical molybdenum micropowder or superfine powder and is collected successively by one-level powder body collecting tank and second patent flour body collecting tank；
5) preparing task amount when completing, first close the first motor to stop conveying molybdenum oxide powder, be then shut off the electrical system that the induction coil with heating cylinder is connected, final cutting powder body carries gas, auxiliary gas and the supply of working gas.
Further, described step 1) concrete operations: utilize air pump to form negative pressure in evacuation in preparation facilities makes it, be then passed through hydrogen from trachea, auxiliary gas entry and working gas entrance simultaneously and realize gas displacement.
Further, described step 2) in, the flow of described working gas is 6～9m3/h；The flow of described auxiliary gas is 2～3m3/h。
Further, described step 3) in, the high-tension electricity that described induction coil loads is 6kV～9kV, and electrical system input power is 20～100kW.
Further, described step 4) in, the particle diameter of described molybdenum oxide powder body is 50～200 μm, and it is 1.0～3kg/h that molybdenum oxide powder adds speed.
Further, described step 4) in, it is 0.3～1.5m that described powder body carries gas flow3/h。
Further, described step 4) in, described in the particle size range of the spherical molybdenum micropowder that obtains or superfine powder be 0.1～100 μm.
Further, described preparation facilities includes powder body uniforming device, trachea, packing auger, feed bin, the first motor, one-level powder body collecting tank, powder feeding gas tube, insulated end cover, heating cylinder, heating cylinder support, second patent flour body collecting tank, air pump and the second motor, wherein:
Described first motor connects packing auger provides driving force for it；Feed bin connects the feed end of packing auger, and packing auger connects heating cylinder by powder feeding gas tube；Installing powder body uniforming device between described packing auger and powder feeding gas tube, this powder body uniforming device is with two tracheas；Powder body uniforming device uses the cylinder that a caliber is bigger than the powder feeding pipe caliber of packing auger；
On the outer wall of described heating cylinder, uniform winding has the induction coil being connected with electrical system；The upper end of heating cylinder is removably provided with insulated end cover；Described powder feeding gas tube enters insulated end cover and extends to the middle part of heating cylinder and i.e. enter the top of gradient temperature field；Heating cylinder outside suit heating cylinder support, and be arranged on above one-level powder body collecting tank by heating cylinder support；Heating cylinder lower end connects with one-level powder body collecting tank；
The outlet of one-level powder body collecting tank is connected by the entrance of connecting tube with second patent flour body collecting tank, and connecting tube is inclined upwardly along powder particles direction certain angle；The exit of second patent flour body collecting tank is provided with Waste gas outlet, and this outlet connects the air pump with the second motor.
Further, described insulated end cover includes upper cover and lower cover two parts；Wherein, described upper cover is for having discoid projection in the middle part of circle and its, and protruding bottom is cylindrical cavity, and protruding center is provided with central through hole；Described lower cover is one with the disk of mesopore, and is provided with a cylinder below lower cover；This barrel bore is the most identical with the internal diameter of the internal diameter of lower cover, upper cover；Upper cover forms a working gas transport tube after fastening with lower cover between the two；Being arranged with two working gas entrances on the sustained height of the sidewall of upper cover, these two working gas entrances be starting point, the inwall along above-mentioned working gas transport tube is provided with two parallel helical grooves as working gas transfer passage；Two auxiliary gas entries it are arranged with on the sustained height of the sidewall of lower cover the latter half；The lower end of described cylinder and the central spot of heating cylinder are in sustained height；A toroidal cavity is formed between outer wall and the heating cylinder inwall of cylinder；This toroidal cavity enables to be entered by auxiliary gas entry the auxiliary gas of heating cylinder and forms gas curtain on heating cylinder inwall, in case metal powder sticks on the inwall of heating cylinder.
Further, described one-level powder body collecting tank is a cylinder, its sidewall is double-layer stainless steel structure, cavity in uniform thickness is formed between this double-decker, this cavity is connected with the coolant outlet of the cooling water inlet on the sidewall of one-level powder body collecting tank lower end and its opposite side wall upper end, and this cavity is for being passed through recirculated water to the high temperature powder rapid condensation nodularization in one-level powder body collecting tank.
Compared with the conventional method, induction field is acted on heating cylinder by the present invention, and make to be cooled with circulating water by heating cylinder, the temperature field that cylinder is heated and then produces therein, with hydrogen as working gas, auxiliary gas and powder carry gas, molybdenum oxide material powder is sent into inner barrel, molybdenum oxide powder body is under the effect of gradient temperature field, moment cracks, gasification is micropowder, and be molybdenum powder granule by hydrogen reducing, molybdenum powder granule continues to shrink under gradient temperature field action, and obtain spherical molybdenum micropowder or superfine powder through rapid condensation nodularization, its particle size range is 0.1～100 μm.The method overcome the deficiency of current spherical molybdenum powder preparation method, simplify production procedure, it is achieved one-step method produces spherical molybdenum powder, reduces production cost, promote for spherical molybdenum powder and established solid foundation.
Accompanying drawing explanation
The generalized section of the preparation facilities that the method that Fig. 1 is the present invention is used.
Fig. 2 is the structural representation of insulated end cover.Wherein, Fig. 2 (a) is the overall structure schematic diagram of insulation lid；Fig. 2 (b) is the schematic diagram of upper cover；Fig. 2 (c) is the schematic diagram of lower cover.
Fig. 3 is the schematic diagram of working gas entrance in insulated end cover.
Fig. 4 is raw material molybdenum oxide electromicroscopic photograph.
Fig. 5 is the molybdenum powder obtained after spheroidising.
Each labelling title in figure: 1, powder body uniforming device, 2, trachea, 3, packing auger, 4, feed bin, 5, first motor, 6, cooling water inlet, 7, one-level powder body collecting tank, 8, gradient temperature field, 9, auxiliary gas, 10, working gas, 11, powder feeding gas tube, 12, working gas entrance, 13, insulated end cover, 14, auxiliary gas entry, 15, heating cylinder, 16, heating cylinder support, 17, coolant outlet, 18, connecting tube, 19, second patent flour body collecting tank, 20, air pump, 21, Waste gas outlet, 22, second motor, 23, metal filtration post, 24, upper cover, 25, lower cover, 26, protruding, 27, central through hole, 28, working gas transfer passage, 29, cylinder, 30, powder body carries gas.
Below in conjunction with the drawings and specific embodiments, the present invention is further explained.
Detailed description of the invention
As it is shown in figure 1, in the method for the preparation metal molybdenum ball-shaped micro powder of the present invention or superfine powder, the preparation facilities structure used is as follows:
Including powder body uniforming device 1, trachea 2, packing auger 3, feed bin the 4, first motor 5, one-level powder body collecting tank 7, powder feeding gas tube 11, insulated end cover 13, heating cylinder 15, heating cylinder support 16, second patent flour body collecting tank 19, air pump 20 and the second motor 22, wherein:
First motor 5 connects packing auger 3 provides driving force for it；Feed bin 4 connects the feed end of packing auger 3, and packing auger 3 connects heating cylinder 15 by powder feeding gas tube 11.
On the outer wall of heating cylinder 15, uniform winding has the induction coil being connected with electrical system, and for making after powered up, heating cylinder 15 is internal produces the gradient temperature field 8 that a temperature changes in gradient to induction coil；The upper end of heating cylinder 15 is removably provided with insulated end cover 13；Heating cylinder 15 outside suit heating cylinder support 16, and be arranged on above one-level powder body collecting tank 7 by heating cylinder support 16；Heating cylinder 15 lower end connects with one-level powder body collecting tank 7.
Seeing Fig. 2 a, insulated end cover 13 includes upper cover 24 and lower cover 25 two parts.Wherein, as shown in Figure 2 b, upper cover 24 is for having discoid protruding 26 in the middle part of circle and its, the bottom of protruding 26 is cylindrical cavity, and the center of protruding 26 is provided with central through hole 27；As shown in Figure 2 c, lower cover 25 is one with the disk of mesopore, and is provided with a cylinder 29 below lower cover 25；This cylinder 29 internal diameter is the most identical with the internal diameter of the internal diameter of lower cover 25, upper cover 24；Upper cover 24 forms a working gas transport tube after fastening with lower cover 25 between the two；Being arranged with two working gas entrances 12 on the sustained height of the sidewall of upper cover 24, these two working gas entrances 12 be starting point, the inwall along above-mentioned working gas transport tube is provided with two parallel helical grooves as working gas transfer passage 28；Working gas transfer passage 28 is for working gas 10 of jetting in heating cylinder 15 in powder body preparation process, form spiral helicine gas distribution field, constraint material powder is in the holdup time of gradient temperature field 8, powder body is made to absorb the heat content that temperature field is maximum, realize thermodynamics reduction and the micro-variations of pattern of powder body, finally give spherical molybdenum micropowder or superfine powder.Two auxiliary gas entries 14 it are arranged with on the sustained height of the sidewall of lower cover 25 the latter half.
The central spot of the lower end of cylinder 29 and heating cylinder 15 is in sustained height；A toroidal cavity is formed between outer wall and heating cylinder 15 inwall of cylinder 29；This toroidal cavity enables to be entered by auxiliary gas entry 14 the auxiliary gas 9 of heating cylinder 15 and forms gas curtain on heating cylinder 15 inwall, in case metal powder sticks on the inwall of heating cylinder 15；
Powder feeding gas tube 11 is entered insulated end cover 13 by the central through hole 27 of upper cover 24 and extends to the middle part of heating cylinder 15 and i.e. enter the top of gradient temperature field 8；
The powder body mix homogeneously of the pulsed flow in order to packing auger 3 is sent here, realize powder body and be transported to heating cylinder 15 inside with uniform flow, being provided with powder body uniforming device 1 between packing auger 3 and powder feeding gas tube 11, this powder body uniforming device 1 is with two tracheas 2；Trachea 2 carries gas 30 for being passed through powder body in powder body uniforming device 1, and powder body carries gas 30 and uses hydrogen, and it is applied not only to carry powder body, and for the powder body being entered powder body uniforming device 1 by packing auger 3 is blown out disperse state；Powder body uniforming device 1 uses the cylinder that a caliber is bigger than the powder feeding pipe caliber of packing auger 3.
One-level powder body collecting tank 7 is a cylinder, its sidewall is double-layer stainless steel structure, cavity in uniform thickness is formed between this double-decker, this cavity is connected with the coolant outlet 17 of the cooling water inlet 6 on the sidewall of one-level powder body collecting tank 7 lower end and its opposite side wall upper end, and this cavity is for being passed through recirculated water to the high temperature powder rapid condensation nodularization in one-level powder body collecting tank 7.In second patent flour body collecting tank, 19 use filter cylinder, are provided with metal filtration post 23 in it, identical with existing product.
The outlet of one-level powder body collecting tank 7 is connected by the entrance of connecting tube 18 with second patent flour body collecting tank 19, and connecting tube 18 certain angle that is inclined upwardly along powder particles direction can return to one-level powder body collecting tank along connecting tube 18 in order to drain into the larger particles powder of connecting tube 8 at one-level powder body collecting tank 7 due to self gravitation；In the present invention, this angle is more than 30 °；The exit of second patent flour body collecting tank 19 is provided with Waste gas outlet 21, and this outlet connects the air pump 20 with the second motor 22, is discharged by Waste gas outlet 21 after being extracted out by the gas in second patent flour body collecting tank 19.
The spherical molybdenum powder of the large-size of heating cylinder 15 output completes to collect in one-level powder body collecting tank 7, relatively fine molybdenum powder granule with air-flow through connecting tube 18 to second patent flour body collecting tank 19, adhere to metal filtration post 23, increase along with adhesive capacity, landing and realize collecting bottom second patent flour body collecting tank 19, waste gas is discharged through Waste gas outlet 21.
The material of insulated end cover 13 is silicon nitride or similar insulant；The material of heating cylinder 15 is chromio, nickel-bass alloy material or similar material；The material of heating cylinder support 16 is pottery.
The preparation metal molybdenum ball-shaped micro powder of the present invention or the method for superfine powder, specifically include following steps:
1) said apparatus is carried out gas displacement so that it is interior original gas is completely exhausted out；Specifically utilize air pump 20 to form negative pressure in evacuation in device makes it, be then passed through the hydrogen of a period of time from trachea 2, auxiliary gas entry and working gas entrance simultaneously and realize gas displacement；Then guarantee that device inside is hydrogen atmosphere, to avoid raw material molybdenum powder and air contact by detonation test；
2) sending into working gas and auxiliary gas in heating cylinder 15 through working gas entrance 12 and auxiliary gas entry 14, the flow of working gas is 6～9m3/ h, the flow of auxiliary gas is 2～3m3/h；Working gas and auxiliary gas all use hydrogen；
3) opening electrical system makes induction coil be energized, and is internally formed gradient temperature field 8 at heating cylinder 15, and the high-tension electricity that induction coil loads is 6kV～9kV, and electrical system input power is 20～100kW；The temperature of above-mentioned gradient temperature field is 1500～2000 DEG C；
4) it is passed through recirculated water to one-level powder body collecting tank 7, add molybdenum oxide powder body to packing auger 3 simultaneously, opening the first motor 5 drives packing auger 3 to run, and the particle diameter of the molybdenum oxide powder body of addition is 50～200 μm, and it is 1.0～3kg/h that molybdenum oxide powder adds speed controlling；Being passed through powder body from trachea 2 and carry gas 30, powder body carries gas 30 and uses hydrogen, and its flow is 0.3～1.5m3/h；Powder body carries gas 30 for carrying the molybdenum oxide powder body of the lamellar exported by packing auger 3 and irregular polyhedrons, successively through powder body uniforming device 1, powder feeding gas tube 11, and the gradient temperature field 8 being transported in heating cylinder 15；
Molybdenum oxide powder body is under the effect of gradient temperature field 8, moment cracking, gasification are micropowder, and be molybdenum powder granule by hydrogen reducing, molybdenum powder granule continues to shrink under gradient temperature field 8 acts on, and obtain rapid condensation nodularization through one-level powder body collecting tank 7 and obtain spherical molybdenum micropowder or superfine powder, its particle size range is 0.1～100 μm, wherein, the spherical molybdenum powder of large-size completes to collect at one-level powder body collecting tank 7, and relatively fine molybdenum powder granule is collected in arriving second patent flour body collecting tank 19 with air-flow.
5) preparing task amount when completing, first close the first motor 5 to stop conveying molybdenum oxide powder, be then shut off the electrical system being connected with the induction coil of heating cylinder 15, final cutting powder carries gas 30, auxiliary gas 9 and the supply of working gas 10.
The following is several embodiments of the present invention, it should be noted that these embodiments are only used to clearly illustrate the present invention, the scope of the present invention is not limited to following example.
Embodiment 1:
Particle mean size 50 μm of raw material oxidation molybdenum powder, carries out spheroidising, and technique is as follows: working gas, auxiliary gas, powder body carry gas and be hydrogen, and their flow is followed successively by 6m3/h、2m3/h、0.3m3/ h, powder feed rate 1.0kg/h；Heating cylinder temperature is 1500 DEG C, nodularization input power 20kW of device.Final products obtained therefrom molybdenum powder Oxygen potential is 98%, and the molybdenum powder particle size range collected in one-level powder body collecting tank is 20～35 μm, and the molybdenum powder particle size range collected in second patent flour body collecting tank is 0.1～20 μm.Being detected raw material molybdenum oxide, spherical molybdenum powder by ASTMB212-99 standard, apparent density is from 1.0g/cm3Bring up to 3.9g/cm3, flow velocity rises to 21s/50g from 50s/50g.
Embodiment 2:
Raw material molybdenum oxide particle mean size 79 μm, carries out spheroidising, and technique is as follows: working gas, auxiliary gas, powder body carry gas and be hydrogen, and their flow is followed successively by 7.5m3/h、2.3m3/h、0.5m3/ h, powder feed rate 1.5kg/h；Heating cylinder temperature is 1750 DEG C, the nodularization output 50kW of device.Final products obtained therefrom molybdenum powder Oxygen potential is 91%, and the molybdenum powder particle size range collected in one-level powder body collecting tank is 25～50 μm, and the molybdenum powder particle size range collected in second patent flour body collecting tank is 0.1～25 μm.Being detected raw material molybdenum oxide, spherical molybdenum powder by ASTMB212-99 standard, apparent density is from 1.08g/cm3Bring up to 4.2g/cm3, flow velocity rises to 19s/50g from 46s/50g.
Embodiment 3:
Raw material molybdenum oxide particle mean size 100 μm, carries out spheroidising, and technique is as follows: working gas, auxiliary gas, powder body carry gas and be hydrogen, and their flow is followed successively by 8m3/h、2.5m3/h、0.8m3/ h, powder feed rate 2kg/h；Heating cylinder temperature is 1850 DEG C, the nodularization output 50kW of device.Final products obtained therefrom molybdenum powder Oxygen potential is 93%, and the molybdenum powder particle size range collected in one-level powder body collecting tank is 25～50 μm, and the molybdenum powder particle size range collected in second patent flour body collecting tank is 0.1～25 μm.Being detected raw material molybdenum oxide, spherical molybdenum powder by ASTMB212-99 standard, apparent density is from 1.1g/cm3Bring up to 5.1g/cm3, flow velocity rises to 16s/50g from 41s/50g.
Embodiment 4:
Raw material molybdenum oxide particle mean size 156 μm, carries out spheroidising, and technique is as follows: working gas, auxiliary gas, powder body carry gas and be hydrogen, and their flow is followed successively by 8.5m3/h、2.8m3/h、1.2m3/ h, powder feed rate 2.5kg/h；Heating cylinder temperature is 1950 DEG C, nodularization input power 85kW of device.Final products obtained therefrom molybdenum powder Oxygen potential is 93%, and the molybdenum powder particle size range collected in one-level powder body collecting tank is 25～100 μm, and the molybdenum powder particle size range collected in second patent flour body collecting tank is 0.1～25 μm.Being detected raw material molybdenum oxide, spherical molybdenum powder by ASTMB212-99 standard, apparent density is from 0.9g/cm3Bring up to 4.5g/cm3, flow velocity rises to 18s/50g from 45s/50g.
Embodiment 5:
Raw material molybdenum oxide particle mean size 200 μm, carries out spheroidising, and technique is as follows: working gas, auxiliary gas, powder body carry gas and be hydrogen, and their flow is followed successively by 9m3/h、3m3/h、1.5m3/ h, powder feed rate 3kg/h；Heating cylinder temperature is 2000 DEG C, nodularization input power 100kW of device.Final products obtained therefrom molybdenum powder Oxygen potential is 95%, and the molybdenum powder particle size range collected in one-level powder body collecting tank is 25～120 μm, and the molybdenum powder particle size range collected in second patent flour body collecting tank is 0.1～25 μm.Being detected raw material molybdenum oxide, spherical molybdenum powder by ASTMB212-99 standard, apparent density is from 0.8g/cm3Bring up to 3.5g/cm3, flow velocity rises to 24s/50g from 52s/50g.
Fig. 2 is raw material molybdenum oxide electromicroscopic photograph, it can be seen that raw material molybdenum oxide is irregular particle agglomeration block, and rough surface.Fig. 3 is the molybdenum powder obtained after spheroidising, and as can be seen from the figure molybdenum powder is all able to nodularization, because absorb heat in temperature field inconsistent, and gained spherical molybdenum powder granule consistency difference.
Claims (9)
1. the method preparing metal molybdenum ball-shaped micro powder or superfine powder, it is characterised in that specifically include
Following steps:
1) preparation facilities is carried out gas displacement so that it is interior original gas is completely exhausted out；
2) through working gas entrance (12) and auxiliary gas entry (14) in heating cylinder (15)
Send into working gas (10) and auxiliary gas (9)；Working gas (10) and auxiliary gas (9) are equal
Use hydrogen；
3) opening electrical system makes the induction coil on heating cylinder (15) be energized, in heating cylinder (15)
It is internally formed gradient temperature field (8)；
The high-tension electricity loaded on described induction coil is 6KV～9KV, and electrical system input power is
20～100KW；The temperature of described gradient temperature field is 1500～2000 DEG C；
4) it is passed through recirculated water to one-level powder body collecting tank (7), adds to packing auger (3) simultaneously
Molybdenum oxide powder body, opens the first motor (5) and drives packing auger (3) to run；From trachea (2)
Being passed through powder body and carry gas (30), powder body carries gas (30) and uses hydrogen；Powder body carries gas (30)
Carry the molybdenum oxide powder body exported by packing auger (3), successively through powder body uniforming device (1)
With powder feeding gas tube (11), being transported in heating cylinder (15), molybdenum oxide powder body is in heating cylinder (15)
Reaction, obtains spherical molybdenum micropowder or superfine powder by one-level powder body collecting tank (7) and second patent flour body collecting tank
(19) collect successively；
5) prepare task amount when completing, first close the first motor (5) to stop conveying molybdenum oxide powder,
It is then shut off the electrical system being connected with the induction coil of heating cylinder (15), final cutting powder body
Carry gas, auxiliary gas and the supply of working gas.
2. preparation metal molybdenum ball-shaped micro powder as claimed in claim 1 or the method for superfine powder, its feature
It is, described step 1) concrete operations: utilize air pump (20) that evacuation in preparation facilities is made it
Interior formation negative pressure, then from trachea (2), auxiliary gas entry (14) and working gas entrance (12)
It is passed through hydrogen simultaneously and realizes gas displacement.
3. preparation metal molybdenum ball-shaped micro powder as claimed in claim 1 or the method for superfine powder, its feature
It is, described step 2) in, the flow of described working gas (10) is 6～9M3/H；Described auxiliary
The flow helping gas (9) is 2～3M3/H。
4. preparation metal molybdenum ball-shaped micro powder as claimed in claim 1 or the method for superfine powder, its feature
It is, described step 4) in, the particle diameter of described molybdenum oxide powder body is 50～200 μMs, molybdenum oxide powder
Adding speed is 1.0～3KG/H.
5. preparation metal molybdenum ball-shaped micro powder as claimed in claim 1 or the method for superfine powder, its feature
It is, described step 4) in, it is 0.3～1.5M that described powder body carries gas (30) flow3/H。
6. preparation metal molybdenum ball-shaped micro powder as claimed in claim 1 or the method for superfine powder, its feature
Be, described step 4) in, described in the particle size range of the spherical molybdenum micropowder that obtains or superfine powder be
0.1～100 μM.
7. preparation metal molybdenum ball-shaped micro powder as claimed in claim 1 or the method for superfine powder, its feature
Being, described preparation facilities includes powder body uniforming device (1), trachea (2), packing auger
(3), feed bin (4), the first motor (5), one-level powder body collecting tank (7), powder feeding gas tube
(11), insulated end cover (13), heating cylinder (15), heating cylinder support (16), two grades
Powder body collecting tank (19), air pump (20) and the second motor (22), wherein:
Described first motor (5) connects packing auger (3) provides driving force for it；Feed bin (4)
Connecting the feed end of packing auger (3), packing auger (3) passes through powder feeding gas tube (11)
Connect heating cylinder (15)；Pacify between described packing auger (3) and powder feeding gas tube (11)
Dress powder body uniforming device (1), this powder body uniforming device (1) is with two tracheas (2)；Powder
Body uniforming device (1) uses the cylinder that a caliber is bigger than the powder feeding pipe caliber of packing auger (3)；
On the outer wall of described heating cylinder (15), uniform winding has the line of induction being connected with electrical system
Circle；The upper end of heating cylinder (15) is removably provided with insulated end cover (13)；Described powder feeding gas
Body pipe (11) enters insulated end cover (13) and extends to the middle part of heating cylinder (15) and i.e. enter ladder
The top of degree temperature field (8)；Heating cylinder (15) outside suit heating cylinder support (16), and
It is arranged on one-level powder body collecting tank (7) top by heating cylinder support (16)；Heating cylinder (15)
Lower end connects with one-level powder body collecting tank (7)；
The outlet of one-level powder body collecting tank (7) is by connecting tube (18) and second patent flour body collecting tank (19)
Entrance be connected, and connecting tube (18) is inclined upwardly along powder particles direction certain angle；Second patent flour
The exit of body collecting tank (19) is provided with Waste gas outlet (21), and this outlet connects with the
The air pump (20) of two motors (22).
8. preparation metal molybdenum ball-shaped micro powder as claimed in claim 7 or the method for superfine powder, its feature
Being, described insulated end cover (13) includes upper cover (24) and lower cover (25) two parts；Wherein,
Described upper cover (24) is for having discoid projection (26) in the middle part of circle and its, under protruding (26)
Portion is cylindrical cavity, and the center of protruding (26) is provided with central through hole (27)；Described lower cover (25)
It is one with the disk of mesopore, and lower cover (25) lower section is provided with a cylinder (29)；This cylinder (29)
Internal diameter is the most identical with the internal diameter of the internal diameter of lower cover (25), upper cover (24)；Upper cover (24) and lower cover
(25) a working gas transport tube is formed between the two after fastening；The sidewall of upper cover (24) same
Two working gas entrances (12) it are arranged with, by these two working gas entrances (12) on height
For starting point, the inwall along above-mentioned working gas transport tube is provided with two parallel helical grooves and makees
For working gas transfer passage (28)；On the sustained height of the sidewall of lower cover (25) the latter half right
Claim to be provided with two auxiliary gas entries (14)；The lower end of described cylinder (29) and heating cylinder (15)
Central spot in sustained height；Shape between outer wall and heating cylinder (15) inwall of cylinder (29)
Become a toroidal cavity；This toroidal cavity enables to be entered heating cylinder by auxiliary gas entry (14)
(15) auxiliary gas (9) forms gas curtain on heating cylinder (15) inwall, in case metal powder glues
It is connected on the inwall of heating cylinder (15).
9. preparation metal molybdenum ball-shaped micro powder as claimed in claim 7 or the method for superfine powder, its feature
Being, described one-level powder body collecting tank (7) is a cylinder, and its sidewall is double-layer stainless steel structure, should
Cavity in uniform thickness is formed, this cavity and one-level powder body collecting tank (7) lower end side between double-decker
Cooling water inlet (6) on wall is connected with the coolant outlet (17) of its opposite side wall upper end, should
Cavity is used for being passed through recirculated water to the high temperature powder rapid condensation nodularization in one-level powder body collecting tank (7).
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| CN107234237B (en) * | 2017-06-29 | 2019-11-19 | 西安欧中材料科技有限公司 | A kind of metal powder degassing method and device thereof |
| CN110919013A (en) * | 2019-12-11 | 2020-03-27 | 湖南天际智慧材料科技有限公司 | Metal powder flame spheroidizing equipment and processing technology thereof |
| CN114905046B (en) * | 2022-06-20 | 2023-03-24 | 江苏威拉里新材料科技有限公司 | 3D printing metal powder spraying processing system and using method thereof |
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| US5073193A (en) * | 1990-06-26 | 1991-12-17 | The University Of British Columbia | Method of collecting plasma synthesize ceramic powders |
| CN1194807C (en) * | 2002-01-08 | 2005-03-30 | 纪崇甲 | DC arc plasma equipment and process for preparing micron-class and nano-class powder material |
| JP3965696B2 (en) * | 2004-02-05 | 2007-08-29 | 日立金属株式会社 | Powder plasma processing apparatus and powder plasma processing method |
| CN101352759A (en) * | 2008-09-02 | 2009-01-28 | 金堆城钼业股份有限公司 | Method for preparing special type molybdenum powder |
| CN101391306B (en) * | 2008-11-20 | 2012-01-25 | 核工业西南物理研究院 | Device and method for preparing globular titanium micro-powder or ultra-micro powder |
| CN101716686B (en) * | 2010-01-05 | 2011-02-16 | 北京科技大学 | Short-flow preparation method of micro-sized spherical titanium powder |
| CN102632249B (en) * | 2012-03-29 | 2013-07-31 | 洛阳开拓者投资管理有限公司 | Method for preparing metal molybdenum powder |
| CN102601385A (en) * | 2012-04-18 | 2012-07-25 | 金堆城钼业股份有限公司 | Preparation method of molybdenum powder |
| CN103157801B (en) * | 2013-04-12 | 2015-06-10 | 金堆城钼业股份有限公司 | Equipment of restraining spheroidized molybdenum powder of direct current plasma temperature field and method |
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