CN114054764A - Spray pipe atomizer for gas atomization powder preparation - Google Patents
Spray pipe atomizer for gas atomization powder preparation Download PDFInfo
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- CN114054764A CN114054764A CN202111404411.3A CN202111404411A CN114054764A CN 114054764 A CN114054764 A CN 114054764A CN 202111404411 A CN202111404411 A CN 202111404411A CN 114054764 A CN114054764 A CN 114054764A
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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
- B22F2009/0832—Handling of atomising fluid, e.g. heating, cooling, cleaning, recirculating
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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
- B22F2009/088—Fluid nozzles, e.g. angle, distance
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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
- B22F2009/0884—Spiral fluid
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- 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 discloses a spray pipe atomizer for gas atomization powder preparation, which comprises a base and a flow guide pipe arranged at the center of the base and used for flowing out of a metal liquid column, wherein a gas storage chamber is arranged in the base and surrounds the flow guide pipe, a gas inlet pipeline is connected in the gas storage chamber, a plurality of atomization spray pipes are arranged at the outlet of the lower end of the gas storage chamber, and the pipe orifices of the plurality of atomization spray pipes are downward and spirally and uniformly distributed around the flowing out metal liquid column. The nozzle atomizer for gas atomization powder preparation provided by the invention has the advantages that the nozzles of the plurality of atomization nozzles are uniformly distributed around the flowing metal liquid column in a spiral shape downwards, and the blocking effect of atomization gas with different heights on splashed metal droplets is utilized, so that the metal droplets are effectively prevented from being adhered or blocked due to backflow or back spraying, the adhesion of atomized metal powder is reduced, the smooth gas atomization powder preparation process is ensured, and the sphericity and yield of atomized metal powder are improved.
Description
Technical Field
The invention belongs to the technical field of powder metallurgy, and particularly relates to a spray pipe atomizer for gas atomization powder preparation.
Background
With the rapid development of additive manufacturing technology and injection molding technology, high-quality spherical titanium alloy powder with high sphericity, good fluidity, and low impurity content has become an important basic raw material for net molding manufacturing process represented by 3D printing technology, and 3D printed products and injection molded products thereof are favored in the fields of aviation, aerospace, electronics, automotive industry, biomedical implants, and the like. In order to improve the quality of the powder and improve the performance of the product, higher requirements are put forward on the preparation of high-quality spherical titanium alloy powder. At present, the preparation of spherical titanium alloy powder for additive manufacturing and injection molding mainly focuses on two technologies, namely VIGA (gas atomization powder preparation) and PREP (plasma rotating electrode powder preparation). Aiming at the problems that the PREP powder preparation is easy to be disintegrated at high rotating speed, bars are difficult to process and the like of brittle materials such as TiAl, TiSi2 and the like, the powder preparation technology is greatly limited. On the contrary, the VIGA-CC (water-cooled copper crucible melting gas atomization powder preparation) technology has no requirement on the shape of the material because the technology is cold wall crucible melting, and has more advantages for preparing spherical powder from brittle materials.
The process and apparatus for preparing spherical titanium alloy powder by VIGA technology have been described in detail in patent nos. ZL201210520110.1, ZL201410687649.5, and ZL 201710752593.0. However, titanium alloys have a high melting point and a high melt viscosity, which have been used to limit the yield of fine powders produced by gas atomization. The fine powder yield reaches the bottleneck through the optimization and adjustment of smelting process parameters and atomization process parameters. The existing ring hole type and ring seam type atomizers have the problems of metal liquid backflow and back spray along with the fluctuation of an airflow field in an atomizing chamber in the atomizing process, so that molten metal liquid is easy to adhere to an atomizing gas outlet until the molten metal liquid is blocked, the atomizers are damaged, and the atomizing powder making process is stopped. Therefore, development of new-structured atomizers is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a spray pipe atomizer for gas atomization powder preparation aiming at the defects of the prior art. This spray tube atomizer for gas atomization powder process all downwards and be heliciform evenly distributed around the metal liquid column that flows through the mouth of pipe with a plurality of atomizing spray tube, utilizes the not block effect of high atomizing gas to the metal liquid drop that splashes, has effectively prevented that metal liquid drop backward flow or back spray form adhesion or jam, has reduced atomizing metal powder's adhesion simultaneously, has guaranteed going on smoothly of gas atomization powder process, has improved atomizing metal powder's sphericity and yield.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a gas atomization is spray tube atomizer for powder process, its characterized in that, includes the base and sets up the honeycomb duct that supplies the metal liquid column to flow in base center department, the base is inside to be provided with gaseous storage chamber around the honeycomb duct, be connected with the admission line in the gaseous storage chamber, the lower extreme exit of gaseous storage chamber is provided with a plurality of atomizing spray tube, and the mouth of pipe of a plurality of atomizing spray tube is all downward to be heliciform evenly distributed around the metal liquid column that flows.
Foretell spray tube atomizer for gas atomization powder process, its characterized in that, the length adjustable of a plurality of atomizing spray tube.
The spray pipe atomizer for gas atomization powder preparation is characterized in that inner cavities of the plurality of atomization spray pipes are of a Laval structure.
Foretell spray tube atomizer for gas atomization powder process, characterized in that, the quantity of atomizing spray tube is 8.
The spray pipe atomizer for gas atomization powder preparation is characterized in that heating coils are arranged around the flow guide pipe inside the base.
Foretell spray tube atomizer for gas atomization powder process, its characterized in that, the admission line passes through the connecting piece and is connected with the atomizing gas source, and the last front end department that is close to the connecting piece of admission line installs airflow control valve.
The spray pipe atomizer for gas atomization powder preparation is characterized in that an atomization gas heater is arranged between the airflow control valve and the connecting piece in the air inlet pipeline.
Compared with the prior art, the invention has the following advantages:
1. the nozzle atomizer for gas atomization powder preparation provided by the invention has the advantages that the nozzles of the plurality of atomization nozzles are uniformly distributed around the flowing metal liquid column in a spiral shape downwards, and the blocking effect of atomization gas with different heights on splashed metal droplets is utilized, so that the metal droplets are effectively prevented from being adhered or blocked due to backflow or back spraying, the adhesion of atomized metal powder is reduced, the smooth gas atomization powder preparation process is ensured, and the sphericity and yield of atomized metal powder are improved.
2. The spray pipe atomizer for pulverizing powder by gas atomization of the invention realizes the sectional uniform impact crushing of the metal liquid column by uniformly distributing the pipe orifices of a plurality of atomization spray pipes around the flowing metal liquid column in a spiral shape, reduces the atomization points and improves the gas atomization efficiency.
3. According to the invention, the atomizing spray pipe with the adjustable length is adopted, the positions of the atomizing spray pipe and the metal liquid column are flexibly adjusted, and further the impact crushing distance and the impact crushing capacity between the atomizing gas sprayed in the atomizing spray pipe and the metal liquid column are controlled, so that the kinetic energy loss of the gas after the atomizing gas is sprayed is reduced, the gas atomizing efficiency is improved, the refinement of atomized metal powder is realized, and the yield of fine powder is improved.
4. According to the invention, the atomizing gas heater is arranged to heat the atomizing gas, so that the temperature of the atomizing gas is changed or increased, the impact crushing capability of the atomizing gas on the metal liquid column is further improved, and the gas atomization efficiency is improved.
5. The length of the atomization spray pipe in the spray pipe atomizer for gas atomization powder preparation is easy to adjust, so that the structure of the atomizer is optimized and improved flexibly and conveniently, the period is shortened, in addition, the atomization spray pipe is low in processing cost and easy to replace, and the production cost is reduced.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic structural view of a nozzle atomizer for pulverizing powder by gas atomization according to the present invention.
FIG. 2 is an SEM image of an atomized TC4 powder produced by a prior art orifice atomizer.
FIG. 3 is an SEM image of an atomized TC4 powder prepared by the nozzle atomizer for aerosolization of powder according to the present invention.
Description of reference numerals:
1-an air inlet duct; 2, connecting pieces; 3-atomizing gas heater;
4-an airflow control valve; 5, a base; 6-heating coil;
7-gas storage chamber; 8, atomizing spray pipes; 9-metal liquid column;
10-atomizing metal powder; 11-a flow guide pipe.
Detailed Description
Example 1
The spray tube atomizer for gas atomization powder process of this embodiment includes base 5 and sets up at 5 center departments of base and supplies the honeycomb duct 11 that the metal liquid column 9 flows, 5 inside surrounding honeycomb ducts 11 of base are provided with gaseous storage chamber 7, be connected with admission line 1 in the gaseous storage chamber 7, and the lower extreme exit of gaseous storage chamber 7 is provided with a plurality of atomizing spray tube 8, and the mouth of pipe of a plurality of atomizing spray tube 8 is all downward to be heliciform evenly distributed around the metal liquid column 9 that flows.
The spray pipe atomizer for pulverizing powder by gas atomization of this embodiment is provided with the base 5, and the guide pipe 11 for the metal liquid column 9 to flow out is arranged at the center of the base 5, and the guide pipe 11 is utilized to provide a guide channel for the metal liquid column 9 formed by melting, so that the metal liquid column 9 flows out from the guide pipe 11 to a gas atomization place under the action of gravity, and a certain pressure is usually adopted to act on the metal liquid column 9 to control the flow speed of the metal liquid column 9, and the spray pipe atomizer is particularly suitable for metals with high melt viscosity, and further controls the speed of pulverizing powder by gas atomization; meanwhile, a gas storage chamber 7 is arranged in the base 5 around the guide pipe 11, the gas storage chamber 7 is connected with the gas inlet pipeline 1, and atomized gas enters the gas storage chamber 7 through the gas inlet pipeline 1 to be stored for gas atomization powder preparation and provided for atomized gas; the spray pipe atomizer for gas atomization powder manufacturing of the embodiment is provided with a plurality of atomizing spray pipes 8 at the lower end outlet of a gas storage chamber 7, the orifices of the atomizing spray pipes 8 are all downward and are uniformly distributed around an outflowing metal liquid column 9 in a spiral shape, and by arranging the atomizing spray pipes 8 with the orifices all downward, atomizing gas stored in the gas storage chamber 7 is sprayed out through the atomizing spray pipes 8, a gas atomization place is formed below the atomizing spray pipes 8 and acts on the metal liquid column 9 below the atomizing spray pipes 8 to impact and break the metal liquid column 9 at the position, as the atomizing spray pipes 8 are uniformly distributed around the outflowing metal liquid column 9 in a spiral shape, namely impact and break points of the atomizing spray pipes 8 exist in the radial direction and the height direction of the metal liquid column 9, so that the sectional uniform impact and break of the metal liquid column 9 are realized, the atomizing efficiency is improved, and the atomizing gas that 8 atomizing spray pipes 8 of eminence sprayed between adjacent can play the metal liquid drop that splashes to the broken point department of impact of 8 atomizing spray pipes of low department and block the effect, effectively prevented that metal liquid drop from flowing back or the back spray from forming adhesion or blockking up in draft tube 11 or atomizing spray pipe 8, reduced the metal liquid drop splash simultaneously and formed the adhesion on the atomizing metal powder that has formed, the smooth of gas atomization powder process is guaranteed going on, the life of spray pipe atomizer has been prolonged, the adhesion phenomenon among the atomizing metal powder has been reduced simultaneously, the sphericity and the yield of atomizing metal powder have been improved, the quality of atomizing metal powder has been improved. In addition, compared with the annular hole type atomizer in which atomization gas is not restrained from a hole injection outlet and expands and diffuses, and the defects of longer atomization area, large kinetic energy loss of the atomization gas and poor atomization effect exist in the metal liquid column at a higher position due to the impact atomization effect, under the condition that the atomization angle is not changed, the nozzle of the atomization spray pipe 8 is introduced and limited to be downwards uniformly distributed around the flowing metal liquid column 9 in a spiral shape, so that the sprayed atomization gas directly acts on the metal liquid column 9 at a short distance, the position of an atomization point is reduced, the atomization point is more concentrated, and the atomization effect is further improved.
Further, the length of the plurality of atomizing nozzles 8 is adjustable. This embodiment is adjustable through the length that sets up a plurality of atomizing spray tube 8, in order to adjust a plurality of atomizing spray tube 8 and metal liquid column 9's position in a flexible way, change the position in gas atomization place, and then control atomizing gas of spraying in a plurality of atomizing spray tube 8 and metal liquid column 9's impact crushing distance and impact crushing ability, concretely, through shortening the length of a plurality of atomizing spray tube 8, atomizing gas and metal liquid column 9's impact crushing distance has been prolonged, the security of gas atomization process has been improved, through the length that increases a plurality of atomizing spray tube 8, atomizing gas and metal liquid column 9's impact crushing distance has been shortened, the gaseous kinetic energy loss after atomizing gas erupts from a plurality of atomizing spray tube 8 has been reduced, the gas atomization efficiency is improved, the gas atomization cycle has been shortened, be favorable to realizing refining of atomizing metal powder. Usually, the afterbody of a plurality of atomizing spray tube 8 passes through threaded connection at the opening part of gas storage cavity 7 to actual atomizing requires in time to change the atomizing spray tube 8 of different specifications, and in time the replacement after 8 consumptions of atomizing spray tube, and it is nimble convenient, reduced the gas atomization cost, improved spray atomizer's practical value.
Further, the inner cavities of the plurality of atomizing nozzles 8 are all of a laval structure. The inner cavity of a plurality of atomizing spray pipe 8 all has the laval structure in this embodiment, has effectively increased atomizing gas's spraying speed, has further improved atomizing gas to the broken ability of impact of metal liquid column 9 to obtain tiny metal liquid drop, improved atomizing metal powder's the degree of refining.
Further, the number of the atomizing nozzles 8 is 8. In actual operation, according to the size of atomizer commonly used, set up 8 evenly distributed's atomizing spray tube 8, both guaranteed gas atomization efficiency, reduced spray tube atomizer's cost again, and convenient control is adjusted.
Further, a heating coil 6 is provided around the duct 11 inside the susceptor 5. This embodiment is through setting up heating coil 6 around 5 inside honeycomb ducts 11 of base, and the metal liquid column 9 that flows out in to honeycomb duct 11 of the heat that utilizes heating coil 6 heating to produce heats and keeps warm, has effectively compensatied the calorific loss that metal liquid column 9 got into the atomizing place in-process, avoids metal liquid column 9 to take place the pre-condensation and produces solid and mix with, and then influences atomizing metal powder's appearance and particle diameter, further improves gas atomization effect, has guaranteed atomizing metal powder's quality.
Further, the air inlet pipeline 1 is connected with an atomization gas source through a connecting piece 2, and an airflow control valve 4 is installed at the front end of the air inlet pipeline 1 close to the connecting piece 2. This embodiment is through the front end department installation airflow control valve 4 that is close to connecting piece 2 on admission line 1, utilizes airflow control valve 4 to carry out control and regulation from the atomizing gas source entering admission line 1's atomizing gas flow, and then has controlled atomizing gas's among the atomizing spray tube 8 jet velocity, has adjusted atomizing gas to the broken degree of impact of metal liquid column 9, has effectively controlled atomizing metal powder's appearance and refined degree.
Further, an atomizing gas heater 3 is arranged between the gas flow control valve 4 and the connecting piece 2 in the gas inlet pipeline 1. This embodiment is through set up atomizing gas heater 3 between air inflow control valve 4 and connecting piece 2 in air inlet pipe 1, utilize atomizing gas heater 3 to heat the atomizing gas that gets into in air inlet pipe 1, change or improved atomizing gas's temperature, further improved atomizing gas to the broken ability of impact of metal liquid column 9, the gas atomization efficiency has been improved, further compensatied metal liquid column 9 simultaneously and got into the calorific loss of atomizing place in-process, the quality of atomizing metal powder has been guaranteed.
The use process of the spray pipe atomizer for gas atomization powder preparation comprises the following steps: the gas inlet pipeline 1 is connected with an atomization gas source, the gas flow control valve 4 is controlled, so that atomization gas enters the gas storage chamber 7 after being heated by the atomization gas heater 3, the guide cylinder 11 is connected with a heating chamber of gas atomization equipment, a metal liquid column 9 formed by melting metal raw materials flows out through the guide cylinder 11, the atomization spray pipe 8 is opened, the atomization gas is sprayed and acts on the metal liquid column 9 to impact and break, a gas atomization place is formed, the metal liquid column 9 is converted into metal liquid drops, and atomization metal powder 10 is formed by condensation.
By adopting the annular hole type atomizer in the prior art and the spray pipe atomizer for gas atomization powder preparation, the atomized TC4 powder is prepared by taking TC4 alloy as a raw material, and the process parameters are as follows: vacuum degree less than 5.0 × 10-2Pa, smelting temperature 1680 ℃, atomization pressure 6MPa, and differential pressure between the smelting chamber and the atomization chamber of 0.2MPa, and the appearance of the corresponding atomized TC4 powder is shown in figures 2 and 3.
Fig. 2 is an SEM image of atomized TC4 powder prepared by a ring-hole atomizer in the prior art, and it can be seen from fig. 2 that the adhesion phenomenon is severe in the atomized TC4 powder prepared by the ring-hole atomizer, and most of the atomized TC4 powder adheres to form satellite powder, which has poor sphericity.
Fig. 3 is an SEM image of the atomized TC4 powder prepared by the nozzle atomizer for pulverizing by gas atomization of the present invention, and it can be seen from fig. 3 that the atomized TC4 powder prepared by the nozzle atomizer for pulverizing by gas atomization of the present invention has high sphericity, less satellite powder content, and higher fine powder content.
Comparing fig. 2 and fig. 3, the spray pipe atomizer for gas atomization powder preparation of the invention effectively prevents the metal liquid drops from being adhered or blocked by backflow or back spray, reduces the atomization point, reduces the adhesion phenomenon in the atomized metal powder, improves the sphericity of the atomized metal powder, and improves the quality and fine powder content of the atomized metal powder.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (7)
1. The utility model provides a gas atomization is spray tube atomizer for powder process, its characterized in that includes base (5) and sets up honeycomb duct (11) that supply metal liquid column (9) to flow in base (5) center department, base (5) inside is provided with gas storage chamber (7) around honeycomb duct (11), be connected with admission line (1) in gas storage chamber (7), the lower extreme exit of gas storage chamber (7) is provided with a plurality of atomizing spray tube (8), and the mouth of pipe of a plurality of atomizing spray tube (8) all is downward to be heliciform evenly distributed around the metal liquid column (9) that flows.
2. A nozzle atomizer for pulverizing by gas atomization according to claim 1, wherein said plurality of atomizing nozzles (8) are adjustable in length.
3. The nozzle atomizer of claim 1, wherein the inner cavities of the atomizing nozzles (8) have a laval structure.
4. A nozzle atomizer for pulverizing by gas atomization according to claim 1, wherein the number of atomizing nozzles (8) is 8.
5. The nozzle atomizer for pulverizing by gas atomization as claimed in claim 1, wherein the heating coil (6) is disposed around the inner flow guide tube (11) of the base (5).
6. A nozzle atomizer for pulverizing by gas atomization according to claim 1, wherein said air inlet pipe (1) is connected to an atomization gas source through a connecting piece (2), and an airflow control valve (4) is installed on the air inlet pipe (1) near the front end of the connecting piece (2).
7. A nozzle atomizer for pulverizing by gas atomization according to claim 6, wherein an atomizing gas heater (3) is disposed between the gas flow control valve (4) and the connecting member (2) in the gas inlet pipe (1).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117139635A (en) * | 2023-10-31 | 2023-12-01 | 江苏贵隆新材料科技有限公司 | Powder metallurgy is with powder process device |
| CN117259770A (en) * | 2023-11-21 | 2023-12-22 | 西安赛隆增材技术股份有限公司 | Gas control system for preparing powder based on PREP and application method thereof |
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