CN116213739A - Method for improving fine powder rate of titanium alloy ball powder in electrode induction gas atomization and application thereof - Google Patents

Method for improving fine powder rate of titanium alloy ball powder in electrode induction gas atomization and application thereof Download PDF

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CN116213739A
CN116213739A CN202310118847.9A CN202310118847A CN116213739A CN 116213739 A CN116213739 A CN 116213739A CN 202310118847 A CN202310118847 A CN 202310118847A CN 116213739 A CN116213739 A CN 116213739A
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titanium alloy
powder
hydrogen
rate
ppm
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张政
林文雄
叶辉
梁永琪
翁文
林紫雄
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Fujian Institute of Research on the Structure of Matter of CAS
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Fujian Institute of Research on the Structure of Matter of CAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/06—Metallic powder characterised by the shape of the particles
    • B22F1/065—Spherical particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0848—Melting process before atomisation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Abstract

The invention belongs to the technical field of metal ball powder preparation, and particularly relates to a method for improving the fine powder rate of titanium alloy ball powder in electrode induction gas atomization and application thereof, wherein the method comprises the following steps: A. preparing a molten titanium alloy having a hydrogen content of 300ppm to 10000 ppm; B. atomizing and pulverizing the molten titanium alloy with the hydrogen content of 300-10000 ppm to obtain titanium alloy ball powder. The invention can obtain powder with the grain diameter smaller than 53 mu m, the powder yield is up to 80 percent and is higher than 30 percent of the prior art, and the process cost is reduced while the fine powder rate is improved.

Description

Method for improving fine powder rate of titanium alloy ball powder in electrode induction gas atomization and application thereof
Technical Field
The invention belongs to the technical field of metal ball powder preparation, and particularly relates to a method for improving the fine powder rate of titanium alloy ball powder in electrode induction gas atomization and application thereof, in particular to the field of titanium alloy ball powder preparation in additive manufacturing and powder metallurgy industries.
Background
The titanium alloy has the advantages of high specific strength, good corrosion resistance, good biocompatibility and the like, and has wide application in the fields of aviation, aerospace, ships, chemical industry, biomedical treatment and the like. The titanium alloy processed by the traditional machining manufacturing process has the problems of high processing difficulty, low material utilization rate and the like, so that the processing cost is high, and the prepared titanium alloy is expensive and difficult to use in a large range.
The 3D printing (additive manufacturing) technology is applied to titanium alloy processing, the problem of high processing difficulty of the traditional machine can be effectively avoided, meanwhile, the 3D printing technology is combined with topological design, the designed data model is used for sintering titanium alloy ball powder layer by using a high-energy heating device to manufacture a component with an expected shape, the weight of the structure can be reduced, the utilization rate of materials is further improved, the manufacturing cost of titanium alloy parts is greatly reduced, and the titanium alloy products are promoted to be applied to the fields of aerospace, biomedical and the like in a wider range.
The electrode induction gas atomization method (EIGA) is the most widely used titanium alloy ball powder production method at present, and has the advantages of low production cost and high production efficiency compared with other process methods such as an inert gas atomization method, an ultrasonic atomization method and the like. However, 3D printing can only use titanium alloy ball powder with the particle size of less than 53 microns, and the qualification rate of the titanium alloy ball powder prepared by an electrode induction gas atomization method is only about 30%, so that the price of the titanium alloy ball powder is higher, and the 3D printing cost of the titanium alloy is higher.
The technical principle of the electrode induction gas atomization method (EIGA) is as follows: the high-speed high-pressure argon gas flow is adopted to impact the titanium alloy melt, the high-speed air flow can overcome the surface tension of the titanium alloy melt, the melt liquid drops are atomized to form fine metal liquid drops, and the fine metal liquid drops are cooled and solidified under the action of the apparent tension to form spherical powder. The existing additive manufacturing technology only can use titanium alloy spherical powder with the particle size below 53 microns, and the particle size of the titanium alloy spherical powder prepared by an electrode induction gas atomization method is less than about 30% of the total powder, so that the price of the titanium alloy spherical powder is higher, and the 3D printing cost of the titanium alloy is further increased.
The key to improving the fine powder rate in the EIGA atomization process is to provide high enough gas kinetic energy to overcome the surface tension of the melt and atomize the metal melt stream to form fine droplets, but the cost of improving the gas kinetic energy is high, and at present, the high-power smelting is mainly used for improving the temperature of the melt, reducing the surface tension of the melt or improving the flow stability of the melt by improving the nozzle structure to improve the fine powder rate.
The patent literature of Guo is quick, liu Changsheng, chenyuan and the like discloses the influence of literature power on the characteristics of TC4 alloy powder for preparing the 3D printing by EIGA, and the application number is 202210679586.3 discloses a titanium alloy for improving the fine powder collecting ratio of inert gas atomized powder for electrode induction smelting and a preparation method of the atomized powder, wherein the high-frequency induction smelting power is improved, the temperature of molten metal liquid flow is improved, the temperature of the molten metal material can be improved according to the relation between the surface tension and the temperature of the metal material, the surface tension of the molten metal material can be reduced, and the low molten metal surface Zhang Ligeng is easy to be atomized to form fine powder under the same high-pressure air flow impact force. However, although the surface tension of the melt of the titanium alloy material can be reduced to a certain extent by increasing the temperature, the effect on pure metal titanium is not great, and the loss of low-melting-point components in the alloy is serious due to the fact that the temperature of the molten state is too high for the titanium alloy, so that the components of the alloy are abnormal.
Xie Bo et al published literature EIGA atomization method for preparing TC for laser 3D printing 4 In the research of alloy powder technology, the kinetic energy of the air flow is increased by increasing the air flow pressure of impact high pressure, so that the surface tension of the metal melt is overcome, the atomization effect is improved, and the research of the Pan Steel group research institute shows that the fine powder rate can be improved by increasing the air flow pressure of impact; however, due to the limitation of the process, the impact kinetic energy is limited to increase, and meanwhile, the excessive air flow and the melt exchange heat, so that the melt is cooled and solidified too quickly to be easily producedThe ellipsoidal formation and the like reduce the performance and quality of the powder, and excessively high air flow rate can increase the loss of high-purity high-pressure argon and increase the process cost.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for improving the fine powder rate of titanium alloy ball powder in electrode induction gas atomization, which combines a titanium heat hydrogen treatment process with an EIGA method, reduces the surface tension and viscosity of molten titanium alloy by utilizing the weak bond effect of hydrogen, and is easier to be scattered into fine metal liquid drops to solidify to form fine ball powder under high-pressure airflow erosion.
In a first aspect, the invention provides a method for improving the fine powder rate of titanium alloy ball powder in electrode induction gas atomization, which comprises the following steps:
A. preparing a molten titanium alloy having a hydrogen content of 300ppm to 10000 ppm;
B. atomizing and pulverizing the molten titanium alloy with the hydrogen content of 300-10000 ppm to obtain titanium alloy ball powder.
According to an embodiment of the present invention, the hydrogen content in the molten titanium alloy is 1000ppm to 8000ppm, preferably 2000ppm to 5000ppm, for example 1000ppm, 1500ppm, 2000ppm, 2500ppm, 3000ppm, 4000ppm, 5000ppm, 6000ppm or 7000ppm.
According to an embodiment of the invention, step a comprises the steps of: the titanium alloy raw material is subjected to high-temperature hydrogen treatment and then melted or the titanium alloy raw material is melted and then subjected to liquid hydrogen treatment.
According to an embodiment of the present invention, the high temperature hydrogen treatment of the titanium alloy raw material comprises the steps of:
a. placing the titanium alloy raw material into a tubular hydrogen treatment furnace, vacuumizing and heating to 400-800 ℃, and charging high-purity hydrogen until the hydrogen partial pressure in the furnace is 5-60 KPa;
b. preserving heat for 5-24h, and cooling to room temperature to obtain the titanium alloy material with the hydrogen content of 300-10000 ppm.
According to an embodiment of the invention, step a is preceded by the steps of: the surface of the titanium alloy raw material is cleaned, preferably using an organic solvent.
According to an embodiment of the invention, the organic solvent comprises at least one of methanol, ethanol, acetone, for example acetone.
According to an embodiment of the invention, the heating to 400-800 ℃ in step a comprises: heating to 400-800 ℃ at a heating rate of 5-15 ℃/min.
According to an embodiment of the invention, the heating temperature is 500-600 ℃.
According to an embodiment of the invention, the aeration is stopped when the partial pressure of hydrogen in the furnace is 10-30 KPa.
According to an embodiment of the present invention, the high temperature hydrogen treatment remelting of a titanium alloy raw material includes the steps of: and (3) putting the titanium alloy material with the hydrogen content of 300 ppm-10000 ppm into an air atomization device for melting.
As one example, melting the titanium alloy material includes the steps of: the titanium alloy material is placed into a clamping piece of an aerosolization device for clamping, a conical area at the bottom of the titanium alloy material is positioned in an induction coil, the cavity of the aerosolization device is vacuumized, high-purity argon is introduced into a smelting area and an atomization area, the smelting power is increased to 30-80 kw, and the temperature is raised until the titanium alloy material is melted.
According to an embodiment of the invention, said step B comprises the steps of: inert gas is sprayed into the molten titanium alloy with the hydrogen content of 300ppm to 10000ppm through an atomizer nozzle, and atomization powder preparation is carried out, so that atomized powder is obtained.
According to an embodiment of the present invention, the angle at which the nozzle ejects the gas is 5 ° to 80 °.
According to an embodiment of the present invention, the gas flow rate ejected from the nozzle is 5 to 35Nm 3 /min。
According to an embodiment of the invention, step B is followed by the further step of: collecting atomized powder.
In a second aspect, the present invention also provides a titanium alloy atomized powder prepared by the above method, where the particle size distribution of the titanium alloy atomized powder is 5-150 microns, and the powder yield of the powder with the particle size less than 53 microns is higher than 30%, preferably the powder yield of the powder with the particle size less than 53 microns is higher than 40%, for example, any point value or any value in any range of values formed by any point values in 35%, 40%, 45%, 50%, 55%, 60%, 68%, 70%, 74%, 80%.
In a third aspect, the invention also provides an application of the titanium alloy atomized powder in 3D printing, for example, in 3D printing for preparing aviation, aerospace, marine, chemical or biomedical devices.
In a fourth aspect, the present invention also provides a method for processing titanium alloy by using the additive manufacturing method, comprising the following steps: and forming the titanium alloy device by 3D printing of the titanium alloy atomized powder.
According to an embodiment of the invention, before processing the titanium alloy, the method further comprises the following steps: and (3) sieving the titanium alloy atomized powder to obtain powder with the particle size smaller than 53 microns.
Advantageous effects
1. The invention surprisingly discovers that titanium alloy bars with the hydrogen content of 300ppm to 10000ppm are melted to obtain titanium alloy liquid drops with higher hydrogen content; or firstly melting the titanium alloy bar, then carrying out liquid hydrogen placement to obtain titanium alloy liquid drops with higher hydrogen content, then carrying out atomization, greatly reducing the surface tension and viscosity of the titanium alloy with high hydrogen content in a molten state, and reducing the viscosity of molten metal liquid flow is favorable for forming finer liquid flow and is favorable for more fully atomizing and forming fine liquid drops by high-pressure air flow impact in an atomization area; the surface tension of the liquid flow is reduced, so that the high-pressure air flow in an atomization area is dispersed and atomized into finer liquid drops, atomized powder with lower fine powder rate is obtained, and the powder yield of the powder with the particle size smaller than 53 mu m obtained after the high-pressure air flow atomization is 80 percent and is higher than 30 percent of that of the existing process; the invention improves the fine powder rate and reduces the process cost.
2. According to the invention, the titanium alloy liquid drops with higher hydrogen content react with oxygen mixed in inert gas at a high temperature state, so that the action of oxygen increasing amount of powder can be reduced, the oxygen contained in atomized gas can be removed by hydrogen contained in melt in the process of smelting the titanium alloy bar with 300-10000 ppm hydrogen content, the oxygen increment of powder is reduced to be within 100ppm, and the oxygen increment of smelting in a pure argon atmosphere is obviously reduced compared with 200ppm oxygen increment, so that the quality of powder is improved.
Drawings
FIG. 1 is a schematic diagram of an aerosolization apparatus according to an embodiment of the present invention;
FIG. 2 is an electron microscopic view of the titanium alloy ball powder prepared in example 1 of the present invention;
FIG. 3 is a graph showing the relationship between the hydrogen content of the prefabricated titanium alloy rod and the oxygen content of the prepared spherical powder in example 1 of the present invention.
Detailed Description
The preparation method of the present invention will be described in further detail with reference to specific examples. It is to be understood that the following examples are illustrative only and are not to be construed as limiting the scope of the invention. All techniques implemented based on the above description of the invention are intended to be included within the scope of the invention.
Unless otherwise indicated, the starting materials and reagents used in the following examples were either commercially available or may be prepared by known methods.
The electrode induction gas atomization in the following embodiment of the invention is carried out in a gas atomization device shown in fig. 1, and the gas atomization device comprises a clamping piece, an induction area and an atomization area which are sequentially arranged from top to bottom, wherein the inductor is provided with a coil, the atomization area is provided with a nozzle, the atomization angle of the nozzle is 5-80 degrees, the clamping piece is used for clamping a titanium alloy bar, the conical area of the clamped titanium alloy bar is positioned in the induction coil, and liquid drops heated by the induction coil enter an atomization bin and are atomized by air flow sprayed by the nozzle to form spherical atomized powder.
Example 1
S101, cleaning a preset titanium alloy bar material by using acetone to remove greasy dirt on the surface of a sample, placing the sample into a hydrogen-placing heating furnace, and vacuumizing to 10 -3 Pa, heating to 650 ℃ at a heating rate of 10 ℃/min, respectively charging high-purity argon and high-purity hydrogen until the hydrogen partial pressure in the furnace is 60KPa, stopping charging, preserving heat for 10h, and cooling to room temperature to obtain the titanium alloy bar with the hydrogen content of 5000 ppm.
S102, clamping and fixing the titanium alloy bar with the hydrogen content of 5000ppm prepared in the step S101 by using an air atomization device shown in fig. 1, wherein a conical area at the bottom of the titanium alloy bar is positioned in an induction coil, and vacuumizing the cavity of the air atomization device.
And S103, introducing high-purity argon into the smelting area and the atomizing area, and improving the smelting power to 60kw.
S104, when the molten titanium alloy falls, introducing high-purity argon into an atomizer nozzle, and enabling the airflow velocity to be 20Nm 3 Atomizing and pulverizing under the condition of/min to obtain the required spherical atomized powder.
Referring to FIG. 2, the spherical atomized powder prepared in this example had a particle size distribution of 5 to 150. Mu.m, and a particle size of less than 53. Mu.m, at 80%.
Example 2
S201, cleaning a preset titanium alloy bar by using acetone to remove greasy dirt on the surface of a sample, placing the sample into a hydrogen-placing heating furnace, and vacuumizing to 10 degrees -3 Pa, heating to 650 ℃ at a heating rate of 10 ℃/min, respectively charging high-purity argon and high-purity hydrogen until the hydrogen partial pressure in the furnace is 50KPa, stopping charging, preserving heat for 10h, and cooling to room temperature to obtain the titanium alloy bar with the hydrogen content of 3000 ppm.
S202, clamping and fixing the titanium alloy bar, wherein a conical area at the bottom of the titanium alloy bar is positioned in the induction coil, and vacuumizing the cavity of the gas atomization device.
And S203, introducing high-purity argon into the smelting area and the atomizing area, and improving the smelting power to 60kw.
S204, when the molten titanium alloy falls, introducing high-purity argon into an atomizer nozzle, and enabling the airflow velocity to be 20Nm 3 Atomizing and pulverizing under the condition of/min to obtain the required spherical atomized powder.
S205, collecting spherical atomized powder through a cyclone separation system.
The spherical atomized powder prepared in the embodiment has the particle size distribution of 5-150 microns and the content of less than 53 microns of 74%.
Example 3
S301, cleaning the preset titanium alloy bar material by using acetone to remove greasy dirt on the surface of a sample, putting the sample into a hydrogen treatment heating furnace,vacuumizing to 10 -3 Pa, heating to 600 ℃ at a heating rate of 10 ℃/min, respectively charging high-purity argon and high-purity hydrogen until the hydrogen partial pressure in the furnace is 40KPa, stopping charging, preserving heat for 10h, and cooling to room temperature to obtain the titanium alloy bar with the hydrogen content of 1500 ppm.
S302, clamping and fixing a preset hydrogen titanium alloy bar, wherein a conical area at the bottom of the titanium alloy bar is positioned in the induction coil, and vacuumizing the cavity of the gas atomization device.
S303, introducing high-purity argon into the smelting area and the atomizing area, and improving the smelting power to 60kw.
S304, when the molten titanium alloy metal falls, introducing high-purity argon into an atomizer nozzle, and enabling the airflow velocity to be 20Nm 3 Atomizing and pulverizing under the condition of/min to obtain the required spherical atomized powder.
S305, collecting spherical atomized powder through a cyclone separation system.
The spherical atomized powder prepared in the embodiment has the particle size distribution of 5-150 microns and the content of less than 53 microns of 68%.
Example 4
S401, cleaning a preset titanium alloy bar by using acetone to remove greasy dirt on the surface of a sample, placing the sample into a hydrogen-placing heating furnace, and vacuumizing to 10 degrees -3 Pa, heating to 500 ℃ at a heating rate of 10 ℃/min, respectively charging high-purity argon and high-purity hydrogen until the hydrogen partial pressure in the furnace is 30KPa, stopping charging, preserving heat for 10h, and cooling to room temperature to obtain the titanium alloy bar with the hydrogen content of 300 ppm.
S402, clamping and fixing a preset hydrogen titanium alloy bar, wherein a conical area at the bottom of the titanium alloy bar is positioned in the induction coil, and vacuumizing the cavity of the gas atomization device.
S403, introducing high-purity argon into the smelting area and the atomizing area, and improving the smelting power to 60kw.
S404, when the molten titanium alloy falls, introducing high-purity argon into an atomizer nozzle, and enabling the airflow velocity to be 20Nm 3 Atomizing and pulverizing under the condition of/min to obtain the required spherical atomized powder.
S405, collecting spherical atomized powder through a cyclone separation system.
The spherical atomized powder prepared in the embodiment has the particle size distribution of 5-150 microns and the content of less than 53 microns of 35%.
Comparative example 1
This comparative example directly uses a bar stock of non-hydrogen titanium alloy as the titanium alloy bar material, and the preparation procedure is the same as in examples S102-S104.
The spherical atomized powder prepared in the comparative example has the particle size distribution of 5-250 microns and the content of less than 53 microns of 28%.
Comparative example 2
This comparative example was conducted in the same manner as in example 1 except that the hydrogen content in the titanium alloy bar was 150 ppm.
The spherical atomized powder prepared in the comparative example has the particle size distribution of 5-250 microns and the content of less than 53 microns of 30%.
Comparative example 3
This comparative example was conducted in the same manner as in example 1 except that the hydrogen content in the titanium alloy bar was 1000 ppm.
The spherical atomized powder prepared in the comparative example has the particle size distribution of 5-150 microns and the content of less than 53 microns of 40%.
According to the invention, hydrogen is placed on a titanium alloy bar to obtain a titanium alloy bar with the hydrogen content controlled at 300-10000 ppm, high-purity argon is introduced into a high-frequency induction smelting area of EIGA equipment, the titanium alloy bar is heated and melted under the action of an electromagnetic field to form molten liquid flow which falls into an atomization area, the molten liquid flow entering the atomization area is broken under high-speed impact of high-pressure air flow, so that the molten liquid flow is atomized into fine metal liquid drops, the liquid drops are changed into spherical particles under surface tension in the air, the spherical particles are rapidly cooled and solidified into metal powder in the atomization area, the metal powder is collected through a cyclone separation system, and residual hydrogen in the powder can be synchronously removed in a vacuum heat treatment process after additive manufacturing and forming. The surface tension of the liquid flow is reduced, so that the high-pressure air flow in an atomization area is dispersed and atomized into finer liquid drops, the fine powder rate is improved, and the process cost is reduced.
In addition, the hydrogen placing process of the titanium alloy bar can also be adopted, or the hydrogen is introduced into the molten titanium alloy and is diffused into the titanium alloy material, so that the same effect of the hydrogen placing process can be achieved; wherein the hydrogen gas can be introduced into the molten titanium alloy. Argon-hydrogen mixture is introduced into the smelting area in the EIGA atomization process to achieve the liquid hydrogen placing effect of the titanium alloy, and the effect of the surface tension and viscosity of the titanium alloy melt can be achieved, so that the positive effect of improving the fine powder rate is achieved, and the above embodiments are described and will not be repeated.
The foregoing description of the specific embodiments of the present invention has been presented by way of example. However, the scope of the present invention is not limited to the above exemplary embodiments. Any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention should be included in the scope of protection of the claims of the present invention.

Claims (10)

1. A method for improving the fine powder rate of titanium alloy ball powder in electrode induction gas atomization, which is characterized by comprising the following steps:
A. preparing a molten titanium alloy having a hydrogen content of 300ppm to 10000 ppm;
B. atomizing and pulverizing the molten titanium alloy with the hydrogen content of 300-10000 ppm to obtain titanium alloy ball powder.
Preferably, the hydrogen content in the molten titanium alloy is 1000ppm to 8000ppm.
2. The method for increasing the fine powder rate of titanium alloy balls in electrode induced aerosolization according to claim 1, wherein step a comprises the steps of: the titanium alloy raw material is subjected to high-temperature hydrogen treatment and then melted or the titanium alloy raw material is melted and then subjected to liquid hydrogen treatment.
3. The method for improving the fine powder rate of titanium alloy ball powder in electrode induction gas atomization according to claim 2, wherein the high-temperature hydrogen treatment of the titanium alloy raw material comprises the following steps:
a. placing the titanium alloy raw material into a tubular hydrogen treatment furnace, vacuumizing and heating to 400-800 ℃, and charging high-purity hydrogen until the hydrogen partial pressure in the furnace is 5-60 KPa;
b. preserving heat for 5-24h, and cooling to room temperature to obtain the titanium alloy material with the hydrogen content of 300-10000 ppm.
4. A method for increasing the fines fraction of titanium alloy spheres in electrode-induced aerosolization according to claim 3, wherein step a is preceded by the steps of: and cleaning the surface of the titanium alloy raw material.
Preferably, the heating to 400-800 ℃ in step a comprises: heating to 400-800 ℃ at a heating rate of 5-15 ℃/min.
Preferably, the aeration is stopped when the partial pressure of hydrogen in the furnace is 10-30 KPa.
5. The method for increasing the fine powder rate of titanium alloy balls in electrode induction gas atomization according to claim 3, wherein the high-temperature hydrogen treatment and remelting of the titanium alloy raw material comprises the following steps: and (3) putting the titanium alloy material with the hydrogen content of 300 ppm-10000 ppm into an air atomization device for melting.
Preferably, melting the titanium alloy material comprises the steps of: the titanium alloy material is placed into a clamping piece of an aerosolization device for clamping, a conical area at the bottom of the titanium alloy material is positioned in an induction coil, the cavity of the aerosolization device is vacuumized, high-purity argon is introduced into a smelting area and an atomization area, the smelting power is increased to 30-80 kw, and the temperature is raised until the titanium alloy material is melted.
6. The method for increasing the fine powder rate of titanium alloy balls in electrode induction gas atomization according to claim 2, wherein the liquid hydrogen-placing treatment is performed after the titanium alloy raw material is melted, comprising the steps of: and melting the titanium alloy raw material, and introducing mixed gas of inert gas and hydrogen into the molten titanium alloy liquid drops to obtain the molten titanium alloy with the hydrogen content of 300 ppm-10000 ppm.
Preferably, in the mixed gas of the inert gas and the hydrogen, the volume ratio of the hydrogen to the inert gas is in the range of 0.1-5%.
7. The method for increasing the fine powder rate of titanium alloy balls in electrode induced gas atomization according to any one of claims 1-6, wherein the step B comprises the steps of: inert gas is sprayed into the molten titanium alloy with the hydrogen content of 300ppm to 10000ppm through an atomizer nozzle, and atomization powder preparation is carried out, so that atomized powder is obtained.
Preferably, the angle of the gas sprayed by the nozzle is 5-80 degrees.
Preferably, the flow rate of the gas sprayed from the nozzle is 5-35 Nm 3 /min。
8. A titanium alloy atomized powder prepared by the method of any one of claims 1-7, wherein the titanium alloy atomized powder has a particle size distribution of 5-150 μm and a powder fraction of less than 53 μm of greater than 30%.
Preferably, the powder rate of the titanium alloy atomized powder with the particle size smaller than 53 microns is higher than 40%.
9. Use of the titanium alloy atomized powder prepared by the method of any one of claims 1-7 or the titanium alloy atomized powder of claim 8 in 3D printing, for example for 3D printing to prepare aviation, aerospace, marine, chemical or biomedical devices.
10. A method of processing a titanium alloy using additive manufacturing, comprising the steps of: forming a titanium alloy device by 3D printing the titanium alloy atomized powder prepared by the method of any one of claims 1-7 or the titanium alloy atomized powder of claim 8.
CN202310118847.9A 2023-02-15 2023-02-15 Method for improving fine powder rate of titanium alloy ball powder in electrode induction gas atomization and application thereof Pending CN116213739A (en)

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