CN110605401B - Preparation method of titanium-aluminum alloy powder - Google Patents
Preparation method of titanium-aluminum alloy powder Download PDFInfo
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- CN110605401B CN110605401B CN201910952110.0A CN201910952110A CN110605401B CN 110605401 B CN110605401 B CN 110605401B CN 201910952110 A CN201910952110 A CN 201910952110A CN 110605401 B CN110605401 B CN 110605401B
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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
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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
- 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
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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
- B22F2009/0848—Melting process before atomisation
Abstract
The invention discloses a preparation method of titanium-aluminum alloy powder, and relates to the technical field of powder preparation. The method comprises the steps of firstly, conveying prepared mixed powder in a melting furnace in vacuum, heating and melting the mixed powder under the protection of gas, and then preparing the metal solution into titanium-aluminum alloy powder by adopting an atomization method under the protection of inert gas, so that impurities are prevented from entering the titanium-aluminum alloy powder in the treatment process, the purity of the titanium-aluminum alloy powder is improved, the process is simple, the cost is low, and the industrialization is easy to realize.
Description
Technical Field
The invention relates to the technical field of powder preparation, in particular to a preparation method of titanium-aluminum alloy powder.
Background
The titanium-aluminum-based intermetallic compound has low density due to good high-temperature mechanical property and high-temperature oxidation resistance, and has wide application prospects in various fields of aerospace, automobile industry, biomedical industry, energy industry and the like. However, the poor plasticity of the titanium-aluminum alloy at room temperature restricts the application of the traditional material processing methods such as forging, turning and the like in the aspect of titanium-aluminum alloy. The powder metallurgy technology provides a good solution for the application bottleneck of the titanium-aluminum alloy, and effectively avoids the problem of difficult plastic processing of the titanium-aluminum-based alloy. The preparation of high-quality titanium-aluminum alloy powder is the basis of the development of powder metallurgy technology. In recent years, with the rapid development of technologies such as powder injection molding, gel casting, metal rapid prototyping, 3D printing, thermal spraying, and the like, the demand for the performance of titanium-aluminum alloy powder is increasing, and particularly the demand for the purity thereof is increasing.
At present, the conventional titanium-aluminum powder is mainly prepared by a mechanical crushing method and an atomization method. Because the titanium-aluminum alloy powder prepared by the mechanical crushing method has higher oxygen content, the use ratio of the titanium-aluminum alloy powder is in a descending trend. The atomization method is further classified into an inert gas atomization method and a centrifugal atomization method. The centrifugal atomization method is mostly used for preparing titanium-aluminum alloy powder by a rotary electrode atomization method. However, although the powder prepared by the centrifugal atomization method has high purity, the powder is too coarse, the fine powder rate is too low, and the centrifugal atomization method is not easy to use in subsequent processing. Conventional titanium aluminum powder preparation is dominated by inert gas atomization. In the existing gas atomization method, impurities are easy to be doped in the treatment process, and the high purity of the titanium-aluminum alloy powder cannot be ensured, so that the requirement of various industries on the high purity of the titanium-aluminum alloy powder cannot be met.
Disclosure of Invention
The invention aims to provide a preparation method of titanium-aluminum alloy powder, so as to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of titanium-aluminum alloy powder comprises the following steps:
step one, uniformly mixing Ti powder and an Al source in proportion to obtain mixed powder;
step two, the mixed powder is conveyed in vacuum and is filled into a melting furnace;
step three, heating and melting the mixed powder under the protection of gas to obtain molten metal solution;
and step four, preparing the molten metal solution into titanium-aluminum alloy powder by adopting a continuous inert gas atomization process.
Preferably, in the first step, the atomic percentage of aluminum in the mixed powder is 43 to 50 percent, and the balance is Ti.
Preferably, in the first step, the Al source is selected from large-particle-size aluminum powder, aluminum strips, aluminum foil or aluminum scraps.
Preferably, in the third step, chlorine gas or fluorine gas is continuously introduced during the heating and melting process, and the flow rate of the gas flow is 80-500 ml/min.
Preferably, in the fourth step, when the molten metal flows below the fine nozzle, inert gas rotating at a high speed is blown in, and the continuous molten metal fine flow is crushed by using the inert gas as an atomizing medium, so as to obtain titanium-aluminum alloy powder with the diameter of 50-100 μm.
Preferably, in the fourth step, the pressure of the inert gas is 2.0-5.0 MPa, and the flow rate is 160-220 Ls－1。
Preferably, the inert gas is argon.
The invention has the beneficial effects that: according to the preparation method of the titanium-aluminum alloy powder, the prepared mixed powder is conveyed in a vacuum mode and is filled into a melting furnace, the titanium-aluminum alloy powder is heated and melted under the protection of gas, then the metal solution is made into the titanium-aluminum alloy powder by adopting an atomization method under the protection of inert gas, impurities are prevented from entering in the treatment process, the purity of the titanium-aluminum alloy powder is improved, the process is simple, the cost is low, and industrialization is easy to realize.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing titanium-aluminum alloy powder provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a method for preparing a titanium-aluminum alloy powder, which may be performed according to the following steps:
step one, uniformly mixing Ti powder and an Al source in proportion to obtain mixed powder.
Wherein, the aluminum atom percentage in the mixed powder can be 43-50%, and the rest can be Ti. The Al source can be selected from large-particle-size aluminum powder, aluminum strips, aluminum foil or aluminum scraps. In this example, the use of an Al source having a relatively large particle size can greatly reduce the oxygen content in the raw material
And step two, the mixed powder is conveyed in a vacuum mode and is filled into a melting furnace.
The melting furnace is connected with the vacuum conveying device, so that the mixed powder can be conveyed into the melting furnace in a vacuum state in the implementation process, and impurities are prevented from being doped in the raw material conveying process and entering the melting furnace. In addition, in order to ensure the pressure of the conveying device, inert gas can be introduced into the device and conveyed under the protection of the inert gas, so that backflow of mixed powder entering the melting furnace is avoided, the pressure in the device can be ensured, and impurities are prevented from being mixed.
And step three, heating and melting the mixed powder under the protection of gas to obtain molten metal solution.
Wherein, chlorine or fluorine gas can be continuously introduced in the heating and melting process, and the flow rate of the gas flow can be 80-500 ml/min. By adopting the technical scheme, impurities can be prevented from being mixed in the heating process, the oxidation phenomenon can be avoided in the adding process, and the product yield is reduced.
And step four, preparing the molten metal solution into titanium-aluminum alloy powder by adopting a continuous inert gas atomization process.
The specific implementation process can be that inert gas rotating at high speed is blown in when the molten metal flows below a fine nozzle, and the continuous molten metal fine flow is crushed by using the inert gas as an atomizing medium to obtain titanium-aluminum alloy powder with the diameter of 50-100 mu m. Moreover, the titanium-aluminum alloy powder obtained by the method is spherical particles with smooth appearance. The titanium-aluminum alloy powder with different diameters can be prepared by adjusting parameters such as the pressure flow of inert gas, the flow of metal solution, the diameter of a nozzle and the like.
In the above implementation process, the pressure of the inert gas can be 3.0-5.0 MPa, and the flow rate is 200-220 Ls－1. By adopting the technical scheme, the prepared titanium-aluminum alloy powder particles can basically meet most requirements.
In an embodiment of the present invention, the inert gas may be argon.
Detailed description of the preferred embodiment 1
Mixing Ti powder and aluminum powder according to the proportion of Ti to 46 at.% of Al to obtain mixed powder; wherein the average powder particle size of Ti powder is 20 μm, and the powder particle size of Al powder is 150 μm;
the obtained mixed powder is conveyed in vacuum and is filled into a melting furnace;
continuously introducing fluorine gas into the melting furnace at the flow rate of 100 ml/min, and heating and melting the mixed powder under the protection of the fluorine gas to obtain molten metal solution;
blowing from a nozzle at a pressure of 3.0MPa and a flow rate of 200Ls－1Argon gas rotating at high speed, which is used as an atomizing medium, breaks up a continuous stream of molten metal to obtain a titanium-aluminum alloy powder with a diameter of 80 μm and an oxygen content of 2000 ppm.
Specific example 2
Mixing Ti powder and aluminum skimmings according to the proportion of Ti to 48 at.% of Al to obtain mixed powder; wherein the powder average particle size of Ti powder is 20 μm;
the obtained mixed powder is conveyed in vacuum and is filled into a melting furnace;
continuously introducing chlorine into the melting furnace at the flow rate of 300 ml/min, and heating and melting the mixed powder under the protection of the chlorine to obtain molten metal solution;
blowing from a nozzle at a pressure of 4.0MPa and a flow rate of 210Ls－1Argon gas rotating at high speed, which is used as atomizing medium, breaks up continuous molten metal fine flow to obtain titanium-aluminum alloy powder with the diameter of 60 mu m, and the oxygen content is 1800 ppm.
Specific example 3
Mixing Ti powder and aluminum powder according to the proportion of Ti to 50 at.% of Al to obtain mixed powder; wherein the average powder particle size of Ti powder is 25 μm, and the powder particle size of Al powder is 200 μm;
the obtained mixed powder is conveyed in vacuum and is filled into a melting furnace;
continuously introducing fluorine gas into the melting furnace at the flow rate of 500 ml/min, and heating and melting the mixed powder under the protection of the fluorine gas to obtain molten metal solution;
blowing from a nozzle at a pressure of 5.0MPa and a flow rate of 220Ls－1Argon gas rotating at high speed, which is used as an atomizing medium, breaks up continuous molten metal fine flow to obtain titanium-aluminum alloy powder with the diameter of 50 mu m, and the oxygen content is 1500 ppm.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained: according to the preparation method of the titanium-aluminum alloy powder, the prepared mixed powder is conveyed in a vacuum mode and is filled into a melting furnace, the titanium-aluminum alloy powder is heated and melted under the protection of gas, then the metal solution is made into the titanium-aluminum alloy powder by adopting an atomization method under the protection of inert gas, impurities are prevented from entering in the treatment process, the purity of the titanium-aluminum alloy powder is improved, the process is simple, the cost is low, and industrialization is easy to realize.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (1)
1. The preparation method of the titanium-aluminum alloy powder is characterized by comprising the following steps:
step one, uniformly mixing Ti powder and an Al source in proportion to obtain mixed powder;
step two, the mixed powder is conveyed in vacuum and is filled into a melting furnace; meanwhile, introducing inert gas into the vacuum conveying device, and conveying the mixed powder under the protection of the inert gas;
step three, heating and melting the mixed powder under the protection of gas to obtain molten metal solution;
step four, preparing the molten metal solution into titanium-aluminum alloy powder by adopting a continuous inert gas atomization process,
in the first step, the atomic percent of aluminum in the mixed powder is 43-50%, and the balance is Ti;
in the first step, the Al source is selected from large-particle-size aluminum powder, aluminum strips, aluminum foils or aluminum scraps;
in the third step, chlorine gas or fluorine gas is continuously introduced in the heating and melting process, and the flow rate of the gas flow is 80-500 ml/min;
blowing inert gas rotating at a high speed when the molten metal flows below a fine nozzle, and crushing continuous molten metal fine flow by using the inert gas as an atomizing medium to obtain titanium-aluminum alloy powder with the diameter of 50-100 mu m;
in the fourth step, the pressure of the inert gas is 2.0-5.0 MPa, and the flow rate is 160-220 Ls－1；
The inert gas is argon.
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| CN111702181B (en) * | 2020-08-04 | 2023-04-18 | 盘星新型合金材料(常州)有限公司 | Preparation method of titanium-aluminum alloy powder, titanium-aluminum alloy powder and application |
| CN114082967A (en) * | 2020-08-06 | 2022-02-25 | 北京理工大学 | Preparation method of aluminum-titanium-based multi-component alloy powder and obtained alloy powder |
| CN115213400A (en) * | 2021-03-31 | 2022-10-21 | 泰州市新龙翔金属制品有限公司 | Production process for improving mechanical property of medical metal alloy |
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| US4762553A (en) * | 1987-04-24 | 1988-08-09 | The United States Of America As Represented By The Secretary Of The Air Force | Method for making rapidly solidified powder |
| CN1255237C (en) * | 2003-06-25 | 2006-05-10 | 中国科学院金属研究所 | Method for bulk preparing intermetallic compound nanometer powder of titanium and aluminium |
| DE102007032406B3 (en) * | 2007-07-10 | 2008-10-23 | Gkss-Forschungszentrum Geesthacht Gmbh | Process to form an alloy for e.g. gas turbine engine by combination of molten titanium and aluminum in presence of halogen-enriched gas |
| CN108213449A (en) * | 2013-07-11 | 2018-06-29 | 中国科学院福建物质结构研究所 | A kind of device for preparing matrix powder material |
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| CN107983965B (en) * | 2017-12-26 | 2020-07-03 | 宝鸡市博信金属材料有限公司 | Preparation method and equipment for high-temperature plasma gas atomization superfine spherical metal powder |
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