CN102861919A - Plasma ultrasonic gas atomization titanium-based powder and preparation method thereof - Google Patents
Plasma ultrasonic gas atomization titanium-based powder and preparation method thereof Download PDFInfo
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- CN102861919A CN102861919A CN2012103561545A CN201210356154A CN102861919A CN 102861919 A CN102861919 A CN 102861919A CN 2012103561545 A CN2012103561545 A CN 2012103561545A CN 201210356154 A CN201210356154 A CN 201210356154A CN 102861919 A CN102861919 A CN 102861919A
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Abstract
The invention relates to plasma ultrasonic gas atomization titanium-based powder and a preparation method thereof. The preparation method includes making raw materials into bars, melting, atomization, cooling, screening and the like. The plasma ultrasonic gas atomization titanium-based powder is spherical powder with particle size lower than 75 micrometers. By using a plasma power supply to heat and melt, current and voltage of the plasma power supply are adjustable, size of each molten drop of melting titanium-based materials can be controlled in a range from 1mm to 3mm, and particle size of the titanium-based powder can be well controlled. Two Laval nozzle sets which are parallel are used as atomization nozzles, so that speed of airflow can reach 1-3mach, particle size of the titanium-based powder can be controlled lower than 75 micrometers, powder with particle size of 45 micrometers accounts for 35-55% after adjustments, and the current industry and market requirements can be fully satisfied.
Description
Technical field
Content of the present invention belongs to the powder metallurgy industry technical field, relates to a kind of process for the production of titanium based powders (spherical powder) and products thereof.
Background technology
The method of this area production titanium based powders (spherical powder) has three kinds at present, that is: rotary electrode method, induction gas atomization and explosive forming method.Because more existing defectives separately, adopt powder-product that these methods produce all can not satisfy the demand in current industry and market aspect a lot.
1, rotary electrode method: the method movable sealing problem in producing titanium based powders process is difficult to solve, because titanium base bar will be with 20000 rev/mins of rotations, shaft seal is worn soon, and to making air enter melting chamber, the hydrogen, oxygen content that causes powder increases and makes the powder-product difficult quality guarantee.The granularity of the powder that other the method is produced is thicker, its granularity is all greater than 75 microns, and present industrial desired particle size is 75 microns to 5 microns, greater than 20 microns less than 75 microns as require the granularity of titanium based powders at heat and other static pressuring processes, the granularity that just requires the titanium based powders in rocket assist agent application facet is less than 45 microns, therefore it can not adapt to the requirement in modern industry and market.This also is the disadvantage of the method.
2, induction gas atomization; The method atomizing valve in producing titanium based powders process is easy to be melted the molten drop obstruction and can't works, in addition the requirement of the air pressure of the method when producing, tolerance is very high, air pressure will be in 5MP～10MP scope, tolerance will have about 3 cubes of per seconds, and the link of control is also a lot, on the granularity of the powder that gas is produced 300 microns to 45 microns, but 300 microns to 75 microns just account for 90%, therefore can not satisfy the requirement in modern industry and market.
3, explosive forming method: the method requires to be necessary in the explosion chamber high negative pressure and just can carry out in producing titanium original washing powder process, vacuum to equipment has high requirement, and every stove can only produce 50kg at most, also need take out high negative pressure after finishing again, and do not possess the condition of suitability for industrialized production.Though the method on the goods granularity than on two kinds of methods much better, be 200 microns to 15 microns (wherein 200 microns to 75 microns be 65%, 75 micron to 15 microns be 35%), still can not satisfy the requirement in modern industry and market.
Summary of the invention
The object of the invention is to overcome all shortcomings that above-mentioned three kinds of prior aries exist, provide a kind of technique circuit advanced reliable, production efficiency is high, product quality is easy to control and can fully satisfy the plasma ultrasonic gas atomization titanium based powders of modern industry and market demands preparation method, simultaneously the present invention is also double to provide a kind of product---plasma ultrasonic gas atomization titanium based powders of being produced by the method preparation.
The preparation method of the plasma ultrasonic gas atomization titanium based powders that provides for achieving the above object comprises following technical process:
Raw material system rod: select the titanium sponge that is greater than or equal to GB TA2 grade or pure titanium material to make the pole material of diameter of phi=16～20 millimeter;
Fusing: the pole material that makes is put into the spray chamber that is filled with argon gas, be that 15～25 kilowatts, voltage are 5～60 volts plasma power supply heat fused with power, after Indoor Temperature rose to above the titanium melting temperature, it was 1～3 millimeter liquid titanium that raw material is melted for the molten drop diameter;
Atomizing: by two groups and be 1～1.3MPa to the convergent-divergent channel nozzle ejection pressure that arranges, air velocity is that 1～3 Mach inert blowing gas hits liquid titanium, makes the liquid titanium granulating of scattering;
Cooling, screening: granular liquid titanium dripped to insert in the argon filling medium tank it is solidified to be cooled to room temperature, to obtain the titanium based powders, recycling bolting titanium based powders is sieved out granularity less than 75 microns spherical powder, is product.
In the implementation, the preparation method of plasma ultrasonic gas atomization titanium based powders of the present invention can adopt following technical process to carry out: (1), raw material system rod: the pole material of the titanium sponge raw material of GB TA2 grade being made diameter of phi=20 millimeter; (2), fusing: the pole material that makes is put into the spray chamber that is filled with argon gas, be that 25 kilowatts, voltage are 5～60 volts plasma power supply heat fused with power, after Indoor Temperature rose to above the titanium melting temperature, it was 1 millimeter liquid titanium that raw material is melted for the molten drop diameter; (3), atomizing: by two groups and be 1～1.3MPa to the convergent-divergent channel nozzle ejection pressure that arranges, air velocity is that the inert blowing gas of mach one hits liquid titanium, makes the liquid titanium granulating of scattering; (4), cooling, screening: granular liquid titanium dripped to insert in the argon filling medium tank it is solidified to be cooled to room temperature, to obtain the titanium based powders, recycling bolting titanium based powders is sieved out granularity less than 75 microns powder, is product.
In the implementation, the preparation method of plasma ultrasonic gas atomization titanium based powders of the present invention also can adopt following technical process to carry out: (1), raw material system rod: the pole material of the titanium sponge raw material of GB TA2 grade being made diameter of phi=20 millimeter; (2), fusing: the pole material that makes is put into the spray chamber that is filled with argon gas, be that 20 kilowatts, voltage are 5～60 volts plasma power supply heat fused with power, after Indoor Temperature rose to above the titanium melting temperature, it was 2 millimeters liquid titanium that raw material is melted for the molten drop diameter; (3), atomizing: by two groups and be 1～1.3MPa to the convergent-divergent channel nozzle ejection pressure that arranges, air velocity is that 1.5 Mach inert blowing gas hits liquid titanium, makes the liquid titanium granulating of scattering; (4), cooling, screening: granular liquid titanium dripped to insert in the argon filling medium tank it is solidified to be cooled to room temperature, to obtain the titanium based powders, recycling bolting titanium based powders is sieved out granularity less than 75 microns powder, is product.
In the implementation, the preparation method of plasma ultrasonic gas atomization titanium based powders of the present invention also can adopt following technical process to carry out: (1), raw material system rod: the pole material of the titanium sponge raw material of GB TA2 grade being made diameter of phi=20 millimeter; (2), fusing: the pole material that makes is put into the spray chamber that is filled with argon gas, be that 15 kilowatts, voltage are 5～60 volts plasma power supply heat fused with power, after Indoor Temperature rose to above the titanium melting temperature, it was 3 millimeters liquid titanium that raw material is melted for the molten drop diameter; (3), atomizing: by two groups and be 1～1.3MPa to the convergent-divergent channel nozzle ejection pressure that arranges, air velocity is that 3 Mach inert blowing gas hits liquid titanium, makes the liquid titanium granulating of scattering; (4), cooling, screening: granular liquid titanium dripped to insert in the argon filling medium tank it is solidified to be cooled to room temperature, to obtain the titanium based powders, recycling bolting titanium based powders is sieved out granularity less than 75 microns powder, is product.
A kind of granularity less than 75 microns spherical titanium based powders according to the standby plasma ultrasonic gas atomization titanium based powders of above-mentioned each side legal system.
In technical process of the present invention, fusing---the adjustment of arbitrary step all can obtain being close to identical product (adjust isoionic power and can make droplet size controlled, adjust air velocity and also can obtain same result) in two steps that atomize.
Compare with existing similar technology, the present invention has adopted plasma power supply heat fused mode, the electric current of plasma power supply, voltage is adjustable, utilize it to be able to be controlled in 1 millimeter to the 3 millimeters scope size dimension of titanium base material molten drop when melting adjustable continuously, thereby the granularity that reaches the titanium based powders has goodish control, simultaneously using two groups and to the convergent-divergent channel that arranges aspect the atomizing valve, so that air velocity reaches the velocity of sound or the velocity of sound above (1～3 Mach), thereby the granularity that makes the titanium based powders is controlled in 75 microns, 45 microns powder can account for 35%～55% after adjusting, it is the highest level (5000 yuans of per kilograms of present 45 microns titanium based powders international market prices so also can bring abundant economic benefit and social benefit) of present titanium based powders.Simultaneously the present invention can follow according to difference and require to adjust droplet size and adjust the requirement that air velocity reaches different indexs, and on supply gas pressure, only need 1MP to 1.3MP, gas flow is about 3 cubes of per minutes, thoroughly changed all shortcomings that original three kinds of methods exist, thereby made the titanium based powders reach the demand in present industry and market fully.
The specific embodiment
Below with reference to embodiment content of the present invention is described further, but practical application form of the present invention is not limited in following embodiment.
Embodiment 1
The titanium sponge raw material of GB TA2 grade is made the pole material of diameter of phi=20 millimeter; The pole material being put into the spray chamber that is filled with argon gas, is that 25 kilowatts, voltage are 5～60 volts plasma power supply heat fused with power, and after Indoor Temperature rose to above the titanium melting temperature, it was 1 millimeter liquid titanium that raw material is melted for the molten drop diameter; By two groups and be that (10kg～13kg), air velocity are that the inert blowing gas of mach one hits liquid titanium to 1～1.3MPa to the convergent-divergent channel nozzle ejection pressure that arranges; make the liquid titanium granulating of scattering; granular liquid titanium dripped to insert in the argon filling medium tank it is solidified to be cooled to room temperature; obtain the titanium based powders; recycling bolting titanium based powders; the gained powder size is: the powder less than 75 microns reaches 100%, and wherein the powder below 45 microns accounts for 55%.
Embodiment 2
The titanium sponge raw material of GB TA2 grade is made the pole material of diameter of phi=20 millimeter; The pole material being put into the spray chamber that is filled with argon gas, is that 20 kilowatts, voltage are 5～60 volts plasma power supply heat fused with power, and after Indoor Temperature rose to above the titanium melting temperature, it was 2 millimeters liquid titanium that raw material is melted for the molten drop diameter; By two groups and be that 1～1.3MPa, air velocity are that 1.5 Mach inert blowing gas hits liquid titanium to the convergent-divergent channel nozzle ejection pressure that arranges; make the liquid titanium granulating of scattering; granular liquid titanium dripped to insert in the argon filling medium tank it is solidified to be cooled to room temperature; obtain the titanium based powders; recycling bolting titanium based powders; the granularity of gained titanium based powders is: the powder less than 75 microns reaches 100%, and wherein the powder below 45 microns accounts for 45%.
Embodiment 3
The titanium sponge raw material of GB TA2 grade is made the pole material of diameter of phi=20 millimeter; The pole material being put into the spray chamber that is filled with argon gas, is that 15 kilowatts, voltage are 5～60 volts plasma power supply heat fused with power, and after Indoor Temperature rose to above the titanium melting temperature, it was 3 millimeters liquid titanium that raw material is melted for the molten drop diameter; By two groups and be that 1～1.3MPa, air velocity are that 3 Mach inert blowing gas hits liquid titanium to the convergent-divergent channel nozzle ejection pressure that arranges; make the liquid titanium granulating of scattering; granular liquid titanium dripped to insert in the argon filling medium tank it is solidified to be cooled to room temperature; obtain the titanium based powders; recycling bolting titanium based powders; the granularity of gained titanium based powders is: the powder less than 75 microns reaches 100%, and wherein the powder below 45 microns accounts for 35%.
Claims (5)
1. the preparation method of a plasma ultrasonic gas atomization titanium based powders is characterized in that comprising following technical process:
Raw material system rod: select the titanium sponge that is greater than or equal to GB TA2 grade or pure titanium material to make the pole material of diameter of phi=16～20 millimeter;
Fusing: the pole material that makes is put into the spray chamber that is filled with argon gas, be that 15～25 kilowatts, voltage are 5～60 volts plasma power supply heat fused with power, after Indoor Temperature rose to above the titanium melting temperature, it was 1～3 millimeter liquid titanium that raw material is melted for the molten drop diameter;
Atomizing: by two groups and be 1～1.3MPa to the convergent-divergent channel nozzle ejection pressure that arranges, air velocity is that 1～3 Mach inert blowing gas hits liquid titanium, makes the liquid titanium granulating of scattering;
Cooling, screening: granular liquid titanium dripped to insert in the argon filling medium tank it is solidified to be cooled to room temperature, to obtain the titanium based powders, recycling bolting titanium based powders is sieved out granularity less than 75 microns spherical powder, is product.
2. the preparation method of plasma ultrasonic gas atomization titanium based powders according to claim 1 is characterized in that comprising following technical process:
Raw material system rod: the pole material of the titanium sponge raw material of GB TA2 grade being made diameter of phi=20 millimeter;
Fusing: the pole material that makes is put into the spray chamber that is filled with argon gas, is that 25 kilowatts, voltage are 5～60 volts plasma power supply heat fused with power, and after Indoor Temperature rose to above the titanium melting temperature, it was 1 millimeter liquid titanium that raw material is melted for the molten drop diameter;
Atomizing: by two groups and be 1～1.3MPa to the convergent-divergent channel nozzle ejection pressure that arranges, air velocity is that the inert blowing gas of mach one hits liquid titanium, makes the liquid titanium granulating of scattering;
Cooling, screening: granular liquid titanium dripped to insert in the argon filling medium tank it is solidified to be cooled to room temperature, to obtain the titanium based powders, recycling bolting titanium based powders is sieved out granularity less than 75 microns powder, is product.
3. the preparation method of plasma ultrasonic gas atomization titanium based powders according to claim 1 is characterized in that comprising following technical process:
Raw material system rod: the pole material of the titanium sponge raw material of GB TA2 grade being made diameter of phi=20 millimeter;
Fusing: the pole material that makes is put into the spray chamber that is filled with argon gas, is that 20 kilowatts, voltage are 5～60 volts plasma power supply heat fused with power, and after Indoor Temperature rose to above the titanium melting temperature, it was 2 millimeters liquid titanium that raw material is melted for the molten drop diameter;
Atomizing: by two groups and be 1～1.3MPa to the convergent-divergent channel nozzle ejection pressure that arranges, air velocity is that 1.5 Mach inert blowing gas hits liquid titanium, makes the liquid titanium granulating of scattering;
Cooling, screening: granular liquid titanium dripped to insert in the argon filling medium tank it is solidified to be cooled to room temperature, to obtain the titanium based powders, recycling bolting titanium based powders is sieved out granularity less than 75 microns powder, is product.
4. the preparation method of plasma ultrasonic gas atomization titanium based powders according to claim 1 is characterized in that comprising following technical process:
Raw material system rod: the pole material of the titanium sponge raw material of GB TA2 grade being made diameter of phi=20 millimeter;
Fusing: the pole material that makes is put into the spray chamber that is filled with argon gas, is that 15 kilowatts, voltage are 5～60 volts plasma power supply heat fused with power, and after Indoor Temperature rose to above the titanium melting temperature, it was 3 millimeters liquid titanium that raw material is melted for the molten drop diameter;
Atomizing: by two groups and be 1～1.3MPa to the convergent-divergent channel nozzle ejection pressure that arranges, air velocity is that 3 Mach inert blowing gas hits liquid titanium, makes the liquid titanium granulating of scattering;
Cooling, screening: granular liquid titanium dripped to insert in the argon filling medium tank it is solidified to be cooled to room temperature, to obtain the titanium based powders, recycling bolting titanium based powders is sieved out granularity less than 75 microns powder, is product.
5. according to claim 1 and 2 or the plasma ultrasonic gas atomization titanium based powders of 3 or 4 described methods preparation, it is characterized in that said titanium based powders is a kind of granularity less than 75 microns spherical titanium based powders.
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| CN103273070A (en) * | 2013-06-03 | 2013-09-04 | 南京雷瑞新材料科技有限公司 | Adjustable ultra-fine atomizing nozzle for titanium and titanium alloy melt |
| CN103433499A (en) * | 2013-08-27 | 2013-12-11 | 湖南航天工业总公司 | Ultrasonic atomization preparation device and method for spherical metal powder |
| CN104308168A (en) * | 2014-09-28 | 2015-01-28 | 陕西维克德科技开发有限公司 | Preparation method of fine particle size and low oxygen spherical titanium and titanium alloy powder |
| CN107052354A (en) * | 2017-06-13 | 2017-08-18 | 河北工业大学 | A kind of device and method for preparing high sphericity 3D printing refractory metal powder |
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| CN107052354A (en) * | 2017-06-13 | 2017-08-18 | 河北工业大学 | A kind of device and method for preparing high sphericity 3D printing refractory metal powder |
| CN107052354B (en) * | 2017-06-13 | 2019-04-12 | 河北工业大学 | A kind of device and method preparing high sphericity 3D printing refractory metal powder |
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