CA3113748C - Rotary disc structure special for drop-by-drop centrifugal atomization method - Google Patents
Rotary disc structure special for drop-by-drop centrifugal atomization method Download PDFInfo
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- CA3113748C CA3113748C CA3113748A CA3113748A CA3113748C CA 3113748 C CA3113748 C CA 3113748C CA 3113748 A CA3113748 A CA 3113748A CA 3113748 A CA3113748 A CA 3113748A CA 3113748 C CA3113748 C CA 3113748C
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- atomization
- drop
- plane
- turnplate
- receiving portion
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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
- B22F9/10—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 using centrifugal force
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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
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Abstract
A rotary disc structure special for a drop-by-drop centrifugal atomization method, comprising: a base body, the base body being a main body structure of which the longitudinal section formed by a receiving part (1) at the upper part and a support part (2) at the lower part is similar to a "T shape", and the upper surface of the receiving part (1) being provided with a circular groove having a specific radius and coaxial with the center of the receiving part (1); an atomization plane (3) of a disc structure, the disc matching the circular groove and being in interference fit with the circular groove, and the atomization plane (3) being made of a material having a wetting angle with an atomization melt of less than 90°; a vent hole (4) provided in the receiving part (1) and the support part (2) in a through manner, the upper end surface of the vent hole (4) contacting the lower end surface of the atomization plane (3), and the lower end of the vent hole (4) being communicated with the outside. A split rotary disc structure is used, a material having good wettability with an atomization melt is used as an atomization plane of the rotary disc, and a material having poor thermal conductivity is used as a base body of the rotary disc, so that metal liquid drops can be well received in an atomization and pulverization process, and full spreading atomization of the liquid drops is facilitated.
Description
Rotary disc structure special for drop-by-drop centrifugal atomization method Technical Field The present disclosure belongs to the technical field for preparing ultrafine spherical particles, specifically relates to a turnplate structure special for drop-by-drop centrifugal atomization method.
Background The receiving device of traditional centrifugal atomization mainly uses integrated turnplate structure, and the material used for turnplate usually has poor wettability with atomized alloy. At this time, the adhesion between the molten alloy and the surface of the turnplate is small, which leads to a very limited kinetic energy for the turnplate to conduct the molten liquid film. When the temperature and the rotate speed of the melt are too high, the melt is easy to sideslip, seriously affecting the atomization efficiency.
In view of the poor atomization effect in traditional centrifugal atomization due to the unsuitable structure of the turnplate, it is necessary to design a turnplate structure to solve the above problems.
Summary of the Invention According to the above-mentioned technical problems of poor atomization effect due to the turnplate structure, the present disclosure provides a turnplate structure special for drop-by-drop centrifugal atomization method. The present disclosure mainly adopts a split-type turnplate structure, the atomization plane and the base respectively select different materials, using the material with better wettability to the atomized melt as the atomization plane of the turnplate and using the material with poor thermal conductivity as the base of the turnplate. An air hole is arranged between the lower end face of the atomization plane and the support portion of the turnplate, which can better accept metal droplets in the atomized powder making process, and is conducive to droplets fully spreading and atomizing.
The technical solution adopted by the present disclosure is as follows:
A turnplate structure special for drop-by-drop centrifugal atomization method, including:
A base with structure of a "T-shaped" longitudinal section constituted of an upper receiving portion and a lower support portion. The upper surface of the receiving portion is Date Recue/Date Received 2021-03-22
Background The receiving device of traditional centrifugal atomization mainly uses integrated turnplate structure, and the material used for turnplate usually has poor wettability with atomized alloy. At this time, the adhesion between the molten alloy and the surface of the turnplate is small, which leads to a very limited kinetic energy for the turnplate to conduct the molten liquid film. When the temperature and the rotate speed of the melt are too high, the melt is easy to sideslip, seriously affecting the atomization efficiency.
In view of the poor atomization effect in traditional centrifugal atomization due to the unsuitable structure of the turnplate, it is necessary to design a turnplate structure to solve the above problems.
Summary of the Invention According to the above-mentioned technical problems of poor atomization effect due to the turnplate structure, the present disclosure provides a turnplate structure special for drop-by-drop centrifugal atomization method. The present disclosure mainly adopts a split-type turnplate structure, the atomization plane and the base respectively select different materials, using the material with better wettability to the atomized melt as the atomization plane of the turnplate and using the material with poor thermal conductivity as the base of the turnplate. An air hole is arranged between the lower end face of the atomization plane and the support portion of the turnplate, which can better accept metal droplets in the atomized powder making process, and is conducive to droplets fully spreading and atomizing.
The technical solution adopted by the present disclosure is as follows:
A turnplate structure special for drop-by-drop centrifugal atomization method, including:
A base with structure of a "T-shaped" longitudinal section constituted of an upper receiving portion and a lower support portion. The upper surface of the receiving portion is Date Recue/Date Received 2021-03-22
2 provided with a circular groove with a certain radius which is coaxial with the center of the receiving portion. The base is made of a material with a thermal conductivity less than 20 W/m/ K;
An atomization plane with disc structure, matches in interference fitting with the circular groove. The atomization plane is made of a material with a wetting angle less than 900 to an atomized melt; and An air hole arranged passing through the receiving portion and the support portion. The upper end face of the air hole is in contract with the lower end face of the atomization plane, and the lower end of the air hole is communicated with the outside.
Preferably, the height of the base is 10 mm to 20 mm. The height of the support portion should not be too high, which should be less than the height of the receiving portion.
Further, the upper end face of the atomization plane is protruded from the upper end face of the receiving portion, and the protrusion ranges from 0.1 mm to 0.5 mm. The protrusion height should be satisfied, the dispersed metal droplets directly fly into the cavity without contacting the base.
Further, a diameter range of the receiving portion ranges from 10 to 100 mm, and the diameter of the circular groove ranges from 5 mm to 90 mm.
Further, a rotate speed of the turnplate ranges from 10000 rpm to 50000 rpm.
Further, the base is made of zirconia ceramic, silica glass or stainless steel, or other materials with a thermal conductivity less than 20 W/m/k.
Further, the upper end face of the air hole is smaller than or equal to the lower end face of the atomization plane. The purpose of setting the air hole is to pump the gas in the gap of the turnplate more cleanly during vacuuming, making the turnplate safer when rotating at a high speed. Therefore, the larger contact area between the upper end face of the air hole and the lower end face of the atomization plane, the better the higher stability of the atomization plane during vacuumizing.
Further, the atomization plane is also provided with a concentric circular groove.
Compared with the prior art, the present disclosure has the following advantages:
1. The present disclosure adopts the material with a thermal conductivity less than 20W/m/k as the base, which can effectively reduce the heat transferred to the high-speed Date Recue/Date Received 2021-03-22
An atomization plane with disc structure, matches in interference fitting with the circular groove. The atomization plane is made of a material with a wetting angle less than 900 to an atomized melt; and An air hole arranged passing through the receiving portion and the support portion. The upper end face of the air hole is in contract with the lower end face of the atomization plane, and the lower end of the air hole is communicated with the outside.
Preferably, the height of the base is 10 mm to 20 mm. The height of the support portion should not be too high, which should be less than the height of the receiving portion.
Further, the upper end face of the atomization plane is protruded from the upper end face of the receiving portion, and the protrusion ranges from 0.1 mm to 0.5 mm. The protrusion height should be satisfied, the dispersed metal droplets directly fly into the cavity without contacting the base.
Further, a diameter range of the receiving portion ranges from 10 to 100 mm, and the diameter of the circular groove ranges from 5 mm to 90 mm.
Further, a rotate speed of the turnplate ranges from 10000 rpm to 50000 rpm.
Further, the base is made of zirconia ceramic, silica glass or stainless steel, or other materials with a thermal conductivity less than 20 W/m/k.
Further, the upper end face of the air hole is smaller than or equal to the lower end face of the atomization plane. The purpose of setting the air hole is to pump the gas in the gap of the turnplate more cleanly during vacuuming, making the turnplate safer when rotating at a high speed. Therefore, the larger contact area between the upper end face of the air hole and the lower end face of the atomization plane, the better the higher stability of the atomization plane during vacuumizing.
Further, the atomization plane is also provided with a concentric circular groove.
Compared with the prior art, the present disclosure has the following advantages:
1. The present disclosure adopts the material with a thermal conductivity less than 20W/m/k as the base, which can effectively reduce the heat transferred to the high-speed Date Recue/Date Received 2021-03-22
3 motor by the turnplate, and prevent from affecting the normal operation of the high-speed motor.
2. The present disclosure adopts the material with good wettability (wetting angle less than 90 ,) to the atomized melt material as the atomization plane, which is conducive to the spreading of the droplets on the atomization plane, thereby making the metal droplets full atomized.
3. The atomization plane and the inner wall of the base in the present disclosure are fixed by interference fitting, so as to ensure that the atomization plane will not fly out when the turnplate rotates at a high speed, ensuring the safety.
2. The present disclosure adopts the material with good wettability (wetting angle less than 90 ,) to the atomized melt material as the atomization plane, which is conducive to the spreading of the droplets on the atomization plane, thereby making the metal droplets full atomized.
3. The atomization plane and the inner wall of the base in the present disclosure are fixed by interference fitting, so as to ensure that the atomization plane will not fly out when the turnplate rotates at a high speed, ensuring the safety.
4. When the atomization plane is installed on the turnplate in the present disclosure, the pores will exist between the atomization plane and the base. When the cavity is pumped to high vacuum, there will be a great pressure difference at both ends of the atomization plane, which will affect the stability of the atomization plane.
Therefore, an air hole is set between the receiving portion and the support portion of the turnplate base to communicate the lower end face of the atomization plane with the outside, so as to keep the pressure consistent at both ends of the atomization plane, thereby further ensuring the stability and safety of the turnplate during high-speed centrifugal atomization.
According to one aspect of the present invention, there is provided a turnplate for drop-by-drop centrifugal atomization, comprising: a base with a "T-shaped"
longitudinal section comprised of an upper receiving portion and a lower support portion;
wherein an upper surface of the receiving portion is provided with a base circular groove with a radius coaxial with a center of the upper receiving portion; and wherein the base is made of a material with a theimal conductivity less than 20 W/m/ K; an atomization plane with disc structure, matching in interference fitting with the base circular groove;
wherein the atomization plane is made of a material with a wetting angle less than 90 to an atomized melt; wherein the atomization plane is provided with an atomization plane circular groove;
an air hole arranged passing through the upper receiving portion and the lower support portion; wherein an upper end face of the air hole is in contact with a lower end face of the atomization plane, and a lower end of the air hole is in communication with the outside;
and wherein an induction heating coil is arranged around the turnplate.
Date Recue/Date Received 2022-06-10 3a Therefore, the application of the technical solutions of the present disclosure can effectively improve the efficiency and quality of atomized powder making.
Based on the above reasons, the present disclosure can be widely used in the field of one-by-one droplets centrifugal atomization.
BRIEF DESCRIPTION OF THE DRAWINGS
To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show some embodiments of the present disclosure, and a person of ordinary skill in the art may still derive other accompanying drawings from these accompanying drawings without creative efforts.
Fig. 1 is a structural schematic diagram I of the present disclosure.
Date Recue/Date Received 2022-06-10 Fig. 2 is a structural schematic diagram II of the present disclosure.
Fig. 3 is a structural schematic diagram of the present disclosure applied to the device for preparing ultrafine spherical metal powder with a low melting point by atomization method.
Fig. 4 is a picture of the fibrous splitting surface obtained by using the turnplate of the present disclosure in the powder making process.
Fig. 5 is a scanning electron microscope image of spherical metal powder prepared by a device for preparing ultrafine spherical metal powder with a low melting point by atomization method; wherein, the turnplate adopts the structure of the turnplate of the present disclosure.
Fig. 6 is a structural schematic diagram of the turnplate provided with a concentric circular groove.
Wherein, in the figures: 1. receiving portion; 2. support portion; 3.
atomization plane; 4.
air hole; 5. ring-shaped resistance heater; 6. washer with small holes; 7.
cavity; 8. turnplate; 9.
motor; 10. metal power; 11. collection tray; 12. housing; 13. induction heating coil; 14.
droplet; 15. cavity intake-tube; 16. diffusion pump; 17. mechanical pump; 18.
cavity exhaust value; 19. crucible cavity; 20. crucible intake-tube; 21. piezoelectric ceramic; 22.
transmission rod; 23. melt; 24. crucible; 25. concentric circular groove.
DESCRIPTION OF THE EMBODIMENTS
It should be noted that, in the case of no conflicts, the embodiments and the features in the embodiments of the present disclosure can be combined mutually. The present disclosure will be described in detail below with reference to the accompanying drawings and the embodiments.
To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely some rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, and in no way serves as any limitation on the present Date Recue/Date Received 2021-03-22 disclosure and its application or use. Based on the embodiments of the present disclosure, all the other embodiments obtained by those of ordinary skill in the art without inventive effort are within the protection scope of the present disclosure.
It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments of the present disclosure. As used herein, unless indicated obviously in the context, a singular form is intended to include a plural form. Furthermore, it should be further understood that the terms "include" and/or "comprise" used in this specification specify the presence of features, steps, operations, devices, components and/or of combinations thereof.
Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure. In addition, it should be clear that, for ease of description, sizes of the various components shown in the accompanying drawings are not drawn according to actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be considered as a part of the authorization specification. In all the examples shown and discussed herein, any specific value should be interpreted as merely being exemplary rather than limiting.
Therefore, other examples of the exemplary embodiment may have different values. It should be noted that similar reference signs and letters represent similar items in the accompanying drawings below. Therefore, once an item is defined in one accompanying drawing, the item does not need to be further discussed in a subsequent accompanying drawing.
In the description of the present disclosure, it should be noted that orientations or position relationships indicated by orientation terms "front, rear, upper, lower, left, and right", "transverse, vertical, perpendicular, and horizontal", "top and bottom", and the like are usually based on orientations or position relationships shown in the accompanying drawings, and these terms are only used to facilitate description of the present disclosure and simplification of the description. In the absence of description to the contrary, these orientation twits do not indicate or imply that the apparatus or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present disclosure:
orientation words "inner and outer" refer to the inside and outside relative to the contour of Date Recue/Date Received 2021-03-22 each component.
For ease of description, spatially relative temis such as "on", "over", "on the upper surface", and "above" can be used here to describe a spatial positional relationship between one device or feature and another device or feature shown in the figures. It should be understood that the spatially relative terms are intended to include different orientations in use or operation other than the orientation of the device described in the figure. For example, if the device in the figure is inverted, the device described as "above another device or structure" or "on another device or structure" is then be positioned as being "below another device or structure" or "beneath a device or structure". Therefore, the exemplary term "above" can include both orientations "above" and "below". The device can also be positioned in other different ways (rotating 90 degrees or in another orientation), and the spatially relative description used herein is explained accordingly.
In addition, it should be noted that using terms such as "first" and "second"
to define components is only for the convenience of distinguishing the corresponding components.
Unless otherwise stated, the foregoing words have no special meaning and therefore cannot be understood as a limitation on the protection scope of the present disclosure.
As Fig. 1 shown, a turnplate structure special for drop-by-drop centrifugal atomization method, includes:
A base with structure of a "T-shaped" longitudinal section constituted of an upper receiving portion 1 and a lower support portion 2. The upper surface of the receiving portion 1 is provided with a circular groove with a certain radius which is coaxial with the center of the receiving portion. The base is made of a material with a thermal conductivity less than 20 W/m/ K, such as zirconia ceramic, silica glass or stainless steel. Preferably, the height of the base ranges from 10 mm to 20 mm. The height of the support portion 2 should not be too high, which should be less than the height of the receiving portion 1. The diameter of the receiving portion ranges from 10 to 100mm, and the diameter of the circular groove ranges from 5 mm to 90 mm. The rotate speed of the turnplate ranges from 10000 rpm to 50000 rpm.
If the diameter of the receiving portion is 100 mm, the rotate speed can reach 10000 rpm driven by the motor.
An atomization plane 3 with disc structure, matches in interference fitting with the circular groove. The atomization plane is made of a material with a wetting angle less than 90 to an atomized melt. For example, when preparing Sn-Pb alloy, stainless steel is selected Date Recue/Date Received 2021-03-22 as the material of the base of the turnplate and copper sheet is selected as the material of the atomization plane. The upper end face of the atomization plane 3 is protruded from the upper end face of the receiving portion 1, and the protrusion ranges from 0.1mm to 0.5 mm. The protrusion height should be satisfied the dispersed metal droplets directly fly into the cavity without contacting the base. A concentric circular groove can also be arranged on the atomization plane 3, as shown in Fig. 6.
An air hole 4 arranged passing through the receiving portion 1 and the support portion 2.
The upper end face of the air hole 4 is in contract with the lower end face of the atomization plane 3, and the lower end of the air hole 4 is communicated with the outside.
The upper end face of the air hole 4 is smaller than or equal to the lower end face of the atomization plane 3. The purpose of setting the air hole 4 is to pump the gas in the gap of the turnplate more cleanly during vacuuming, making the turnplate safer when rotating at a high speed. Therefore, the larger contact area between the upper end face of the air hole 4 and the lower end face of the atomization plane 3, the better the higher stability of the atomization plane during vacuumizing.
As shown in Fig. 2, in the actual processing process, if the diameter of the receiving portion of the turnplate is 20 mm, a drill bit of 45 is usually used for processing the air hole 4, so there will be a processing convex angle as shown in the figure.
Embodiment 1 As shown in Fig. 3, the turnplate structure of the present disclosure is applied to the low melting point pressure bar pulsated orifice ejection device to prepare SN63PB37 alloy metal powder.
The experimental device includes a housing 12, a crucible 24 arranged in the housing 12 and a powder collection area. The powder collection area is arranged at the bottom of the housing 12, and the crucible 24 is arranged above the powder collection area.
The crucible 24 is provide with a transmission rod 22 which is connected to a piezoelectric ceramic 21 arranged outside the housing 12. A lower end of the transmission rod 22 is faced towards a center hole at the bottom portion of the crucible 24, and a washer 6 with small holes is fixed at the bottom portion of the center hole. The crucible cavity 19 contains metal melt. The Date Recue/Date Received 2021-03-22 housing 12 is also provided with a crucible intake-tube pipe 20 extending into the crucible 24.
The side wall of the housing 12 is provided with a mechanical pump 16 and a diffusion pump 17 which are communicated to the crucible 24. The housing 12 is also provided with a cavity intake-tube pipe 15 and a cavity exhaust value 18 for air intake and exhaust of the cavity 7. A
thermocouple is arranged inside the crucible 24, and a ring-shaped resistance heater 5 is arranged outside the crucible 24.
The powder collection area includes a collection tray 11 arranged at the bottom of the housing, a turnplate 8 arranged above the collection tray 11 and connected with a motor 9 for atomizing metal droplets 14, and an induction heating coil 13 arranged around the turnplate 8.
The melt material used in the experiment is Sn63Pb37 alloy, the material of the atomization plane 3 is fine copper, and the material of the base is stainless steel. Through the experiment with this structure, as shown in Fig. 4, the fibrous splitting of the metal liquid is realized, and the radial metal liquid lines can be observed on the atomization plane. The obtained metal powder has fine particle size, narrow particle size distribution, high sphericity, satellite droplet free and hollow droplet free, good flowability and spreadability, and has very high fine powder yield (as shown in Fig. 5) Another structure of the application, the atomization plane 3 is provided with a concentric circular groove 25 matching the washer 6. When the washer 6 is provided with a plurality of small holes, during the falling process of the droplets formed by passing the plurality of small holes, the droplets will not aggregate under the action of electric filed, but fall into the concentric circular groove at the center of the turnplate and gradually spread over the groove. Due to the centrifugal force is small at this time, the droplets will not disperse immediately, but will spread in a circular on the turnplate. When the droplets spread in a certain range and the centrifugal force is large enough, the spread metal will disperse on the turnplate in a fiber line shape to the edge of the turnplate under the action of centrifugal force, and finally split into tiny droplets to fly out. The tiny droplets solidify without a container in the falling process to form metal powder and fall into the collection tray.
At last, it should be stated that the above various embodiments are only used to illustrate the technical solutions of the present invention without limitation; and despite reference to the aforementioned embodiments to make a detailed description of the present invention, Date Recue/Date Received 2021-03-22 those of ordinary skilled in the art should understand: the described technical solutions in above various embodiments may be modified or the part of or all technical features may be equivalently substituted; while these modifications or substitutions do not make the essence of their corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.
Date Recue/Date Received 2021-03-22
Therefore, an air hole is set between the receiving portion and the support portion of the turnplate base to communicate the lower end face of the atomization plane with the outside, so as to keep the pressure consistent at both ends of the atomization plane, thereby further ensuring the stability and safety of the turnplate during high-speed centrifugal atomization.
According to one aspect of the present invention, there is provided a turnplate for drop-by-drop centrifugal atomization, comprising: a base with a "T-shaped"
longitudinal section comprised of an upper receiving portion and a lower support portion;
wherein an upper surface of the receiving portion is provided with a base circular groove with a radius coaxial with a center of the upper receiving portion; and wherein the base is made of a material with a theimal conductivity less than 20 W/m/ K; an atomization plane with disc structure, matching in interference fitting with the base circular groove;
wherein the atomization plane is made of a material with a wetting angle less than 90 to an atomized melt; wherein the atomization plane is provided with an atomization plane circular groove;
an air hole arranged passing through the upper receiving portion and the lower support portion; wherein an upper end face of the air hole is in contact with a lower end face of the atomization plane, and a lower end of the air hole is in communication with the outside;
and wherein an induction heating coil is arranged around the turnplate.
Date Recue/Date Received 2022-06-10 3a Therefore, the application of the technical solutions of the present disclosure can effectively improve the efficiency and quality of atomized powder making.
Based on the above reasons, the present disclosure can be widely used in the field of one-by-one droplets centrifugal atomization.
BRIEF DESCRIPTION OF THE DRAWINGS
To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly describes the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show some embodiments of the present disclosure, and a person of ordinary skill in the art may still derive other accompanying drawings from these accompanying drawings without creative efforts.
Fig. 1 is a structural schematic diagram I of the present disclosure.
Date Recue/Date Received 2022-06-10 Fig. 2 is a structural schematic diagram II of the present disclosure.
Fig. 3 is a structural schematic diagram of the present disclosure applied to the device for preparing ultrafine spherical metal powder with a low melting point by atomization method.
Fig. 4 is a picture of the fibrous splitting surface obtained by using the turnplate of the present disclosure in the powder making process.
Fig. 5 is a scanning electron microscope image of spherical metal powder prepared by a device for preparing ultrafine spherical metal powder with a low melting point by atomization method; wherein, the turnplate adopts the structure of the turnplate of the present disclosure.
Fig. 6 is a structural schematic diagram of the turnplate provided with a concentric circular groove.
Wherein, in the figures: 1. receiving portion; 2. support portion; 3.
atomization plane; 4.
air hole; 5. ring-shaped resistance heater; 6. washer with small holes; 7.
cavity; 8. turnplate; 9.
motor; 10. metal power; 11. collection tray; 12. housing; 13. induction heating coil; 14.
droplet; 15. cavity intake-tube; 16. diffusion pump; 17. mechanical pump; 18.
cavity exhaust value; 19. crucible cavity; 20. crucible intake-tube; 21. piezoelectric ceramic; 22.
transmission rod; 23. melt; 24. crucible; 25. concentric circular groove.
DESCRIPTION OF THE EMBODIMENTS
It should be noted that, in the case of no conflicts, the embodiments and the features in the embodiments of the present disclosure can be combined mutually. The present disclosure will be described in detail below with reference to the accompanying drawings and the embodiments.
To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely some rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, and in no way serves as any limitation on the present Date Recue/Date Received 2021-03-22 disclosure and its application or use. Based on the embodiments of the present disclosure, all the other embodiments obtained by those of ordinary skill in the art without inventive effort are within the protection scope of the present disclosure.
It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments of the present disclosure. As used herein, unless indicated obviously in the context, a singular form is intended to include a plural form. Furthermore, it should be further understood that the terms "include" and/or "comprise" used in this specification specify the presence of features, steps, operations, devices, components and/or of combinations thereof.
Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure. In addition, it should be clear that, for ease of description, sizes of the various components shown in the accompanying drawings are not drawn according to actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be considered as a part of the authorization specification. In all the examples shown and discussed herein, any specific value should be interpreted as merely being exemplary rather than limiting.
Therefore, other examples of the exemplary embodiment may have different values. It should be noted that similar reference signs and letters represent similar items in the accompanying drawings below. Therefore, once an item is defined in one accompanying drawing, the item does not need to be further discussed in a subsequent accompanying drawing.
In the description of the present disclosure, it should be noted that orientations or position relationships indicated by orientation terms "front, rear, upper, lower, left, and right", "transverse, vertical, perpendicular, and horizontal", "top and bottom", and the like are usually based on orientations or position relationships shown in the accompanying drawings, and these terms are only used to facilitate description of the present disclosure and simplification of the description. In the absence of description to the contrary, these orientation twits do not indicate or imply that the apparatus or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present disclosure:
orientation words "inner and outer" refer to the inside and outside relative to the contour of Date Recue/Date Received 2021-03-22 each component.
For ease of description, spatially relative temis such as "on", "over", "on the upper surface", and "above" can be used here to describe a spatial positional relationship between one device or feature and another device or feature shown in the figures. It should be understood that the spatially relative terms are intended to include different orientations in use or operation other than the orientation of the device described in the figure. For example, if the device in the figure is inverted, the device described as "above another device or structure" or "on another device or structure" is then be positioned as being "below another device or structure" or "beneath a device or structure". Therefore, the exemplary term "above" can include both orientations "above" and "below". The device can also be positioned in other different ways (rotating 90 degrees or in another orientation), and the spatially relative description used herein is explained accordingly.
In addition, it should be noted that using terms such as "first" and "second"
to define components is only for the convenience of distinguishing the corresponding components.
Unless otherwise stated, the foregoing words have no special meaning and therefore cannot be understood as a limitation on the protection scope of the present disclosure.
As Fig. 1 shown, a turnplate structure special for drop-by-drop centrifugal atomization method, includes:
A base with structure of a "T-shaped" longitudinal section constituted of an upper receiving portion 1 and a lower support portion 2. The upper surface of the receiving portion 1 is provided with a circular groove with a certain radius which is coaxial with the center of the receiving portion. The base is made of a material with a thermal conductivity less than 20 W/m/ K, such as zirconia ceramic, silica glass or stainless steel. Preferably, the height of the base ranges from 10 mm to 20 mm. The height of the support portion 2 should not be too high, which should be less than the height of the receiving portion 1. The diameter of the receiving portion ranges from 10 to 100mm, and the diameter of the circular groove ranges from 5 mm to 90 mm. The rotate speed of the turnplate ranges from 10000 rpm to 50000 rpm.
If the diameter of the receiving portion is 100 mm, the rotate speed can reach 10000 rpm driven by the motor.
An atomization plane 3 with disc structure, matches in interference fitting with the circular groove. The atomization plane is made of a material with a wetting angle less than 90 to an atomized melt. For example, when preparing Sn-Pb alloy, stainless steel is selected Date Recue/Date Received 2021-03-22 as the material of the base of the turnplate and copper sheet is selected as the material of the atomization plane. The upper end face of the atomization plane 3 is protruded from the upper end face of the receiving portion 1, and the protrusion ranges from 0.1mm to 0.5 mm. The protrusion height should be satisfied the dispersed metal droplets directly fly into the cavity without contacting the base. A concentric circular groove can also be arranged on the atomization plane 3, as shown in Fig. 6.
An air hole 4 arranged passing through the receiving portion 1 and the support portion 2.
The upper end face of the air hole 4 is in contract with the lower end face of the atomization plane 3, and the lower end of the air hole 4 is communicated with the outside.
The upper end face of the air hole 4 is smaller than or equal to the lower end face of the atomization plane 3. The purpose of setting the air hole 4 is to pump the gas in the gap of the turnplate more cleanly during vacuuming, making the turnplate safer when rotating at a high speed. Therefore, the larger contact area between the upper end face of the air hole 4 and the lower end face of the atomization plane 3, the better the higher stability of the atomization plane during vacuumizing.
As shown in Fig. 2, in the actual processing process, if the diameter of the receiving portion of the turnplate is 20 mm, a drill bit of 45 is usually used for processing the air hole 4, so there will be a processing convex angle as shown in the figure.
Embodiment 1 As shown in Fig. 3, the turnplate structure of the present disclosure is applied to the low melting point pressure bar pulsated orifice ejection device to prepare SN63PB37 alloy metal powder.
The experimental device includes a housing 12, a crucible 24 arranged in the housing 12 and a powder collection area. The powder collection area is arranged at the bottom of the housing 12, and the crucible 24 is arranged above the powder collection area.
The crucible 24 is provide with a transmission rod 22 which is connected to a piezoelectric ceramic 21 arranged outside the housing 12. A lower end of the transmission rod 22 is faced towards a center hole at the bottom portion of the crucible 24, and a washer 6 with small holes is fixed at the bottom portion of the center hole. The crucible cavity 19 contains metal melt. The Date Recue/Date Received 2021-03-22 housing 12 is also provided with a crucible intake-tube pipe 20 extending into the crucible 24.
The side wall of the housing 12 is provided with a mechanical pump 16 and a diffusion pump 17 which are communicated to the crucible 24. The housing 12 is also provided with a cavity intake-tube pipe 15 and a cavity exhaust value 18 for air intake and exhaust of the cavity 7. A
thermocouple is arranged inside the crucible 24, and a ring-shaped resistance heater 5 is arranged outside the crucible 24.
The powder collection area includes a collection tray 11 arranged at the bottom of the housing, a turnplate 8 arranged above the collection tray 11 and connected with a motor 9 for atomizing metal droplets 14, and an induction heating coil 13 arranged around the turnplate 8.
The melt material used in the experiment is Sn63Pb37 alloy, the material of the atomization plane 3 is fine copper, and the material of the base is stainless steel. Through the experiment with this structure, as shown in Fig. 4, the fibrous splitting of the metal liquid is realized, and the radial metal liquid lines can be observed on the atomization plane. The obtained metal powder has fine particle size, narrow particle size distribution, high sphericity, satellite droplet free and hollow droplet free, good flowability and spreadability, and has very high fine powder yield (as shown in Fig. 5) Another structure of the application, the atomization plane 3 is provided with a concentric circular groove 25 matching the washer 6. When the washer 6 is provided with a plurality of small holes, during the falling process of the droplets formed by passing the plurality of small holes, the droplets will not aggregate under the action of electric filed, but fall into the concentric circular groove at the center of the turnplate and gradually spread over the groove. Due to the centrifugal force is small at this time, the droplets will not disperse immediately, but will spread in a circular on the turnplate. When the droplets spread in a certain range and the centrifugal force is large enough, the spread metal will disperse on the turnplate in a fiber line shape to the edge of the turnplate under the action of centrifugal force, and finally split into tiny droplets to fly out. The tiny droplets solidify without a container in the falling process to form metal powder and fall into the collection tray.
At last, it should be stated that the above various embodiments are only used to illustrate the technical solutions of the present invention without limitation; and despite reference to the aforementioned embodiments to make a detailed description of the present invention, Date Recue/Date Received 2021-03-22 those of ordinary skilled in the art should understand: the described technical solutions in above various embodiments may be modified or the part of or all technical features may be equivalently substituted; while these modifications or substitutions do not make the essence of their corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.
Date Recue/Date Received 2021-03-22
Claims (6)
1. A turnplate for drop-by-drop centrifugal atomization, comprising:
a base with a "T-shaped" longitudinal section comprised of an upper receiving portion and a lower support portion; wherein an upper surface of the receiving portion is provided with a base circulax groove with a radius coaxial with a center of the upper receiving portion; and wherein the base is made of a material with a thermal conductivity less than 20 W/m/ K;
an atomization plane with disc structure, matching in interference fitting with the base circular groove; wherein the atomization plane is made of a material with a wetting angle less than 90°to an atomized melt; wherein the atomization plane is provided with an atomization plane circular groove;
an air hole arranged passing through the upper receiving portion and the lower support portion; wherein an upper end face of the air hole is in contact with a lower end face of the atomization plane, and a lower end of the air hole is in communication with the outside; and wherein an induction heating coil is arranged around the turnplate.
a base with a "T-shaped" longitudinal section comprised of an upper receiving portion and a lower support portion; wherein an upper surface of the receiving portion is provided with a base circulax groove with a radius coaxial with a center of the upper receiving portion; and wherein the base is made of a material with a thermal conductivity less than 20 W/m/ K;
an atomization plane with disc structure, matching in interference fitting with the base circular groove; wherein the atomization plane is made of a material with a wetting angle less than 90°to an atomized melt; wherein the atomization plane is provided with an atomization plane circular groove;
an air hole arranged passing through the upper receiving portion and the lower support portion; wherein an upper end face of the air hole is in contact with a lower end face of the atomization plane, and a lower end of the air hole is in communication with the outside; and wherein an induction heating coil is arranged around the turnplate.
2. The tumplate for drop-by-drop centrifugal atomization according to claim 1, wherein the upper end face of the atomization plane is protruded from the upper end face of the receiving portion, and the protrusion ranges from 0.1mm to 0.5 mm.
3. The tumplate for drop-by-drop centrifugal atomization according to claim 1, wherein a diameter of the receiving portion ranges from 10 to 100 mm, and a diameter of the base circular groove ranges from 5 mm to 90 mm.
4. The turnplate for drop-by-drop centrifugal atomization according to claim 1, wherein a rotational speed of the turnplate ranges from 10000 rpm to 50000 rpm.
5. The turnplate for drop-by-drop centrifugal atomization according to claim 1, wherein the base is made of zirconia ceramic, silica glass or stainless steel.
6. The tumplate for drop-by-drop centrifugal atomization according to claim 1, wherein an area of the upper end face of the air hole is smaller than or equal to an area of the lower end face of the atomization plane.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811116502.5 | 2018-09-25 | ||
| CN201811116502.5A CN109175392A (en) | 2018-09-25 | 2018-09-25 | One kind is by drop centrifugal atomization Special turntable structure |
| PCT/CN2019/107705 WO2020063627A1 (en) | 2018-09-25 | 2019-09-25 | Rotary disc structure special for drop-by-drop centrifugal atomization method |
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| Publication Number | Publication Date |
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| CA3113748A1 CA3113748A1 (en) | 2020-04-02 |
| CA3113748C true CA3113748C (en) | 2023-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CA3113748A Active CA3113748C (en) | 2018-09-25 | 2019-09-25 | Rotary disc structure special for drop-by-drop centrifugal atomization method |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN109175392A (en) |
| CA (1) | CA3113748C (en) |
| WO (1) | WO2020063627A1 (en) |
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| CN109175392A (en) * | 2018-09-25 | 2019-01-11 | 大连理工大学 | One kind is by drop centrifugal atomization Special turntable structure |
| CN114713825A (en) * | 2022-04-12 | 2022-07-08 | 江苏天工科技股份有限公司 | Efficient titanium alloy electrode preparation equipment |
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| US3646175A (en) * | 1970-09-21 | 1972-02-29 | Rmi Co | Method and apparatus for converting miscellaneous pieces of reactive metals to a usable form |
| US3963812A (en) * | 1975-01-30 | 1976-06-15 | Schlienger, Inc. | Method and apparatus for making high purity metallic powder |
| US4178335A (en) * | 1977-12-21 | 1979-12-11 | United Technologies Corporation | Method of producing solid particles of metal |
| JPS5940054B2 (en) * | 1978-08-29 | 1984-09-27 | 株式会社佐藤技術研究所 | Method for producing spherical particles of a specific size from a melt |
| CN1676249A (en) * | 2005-04-25 | 2005-10-05 | 北京科技大学 | Method and apparatus for preparing sheet-type metal pwoder by atomized drop deformation |
| JP2009062573A (en) * | 2007-09-05 | 2009-03-26 | National Institute For Materials Science | Rotary disk used for centrifugal atomization method, and centrifugal atomization method using the same |
| CN104525961A (en) * | 2015-01-28 | 2015-04-22 | 大连理工大学 | Method and device for efficiently preparing superfine spherical metal powder with high melting point |
| CN105728738B (en) * | 2016-03-21 | 2018-03-06 | 孙颖 | Electrodeless variable-speed machinery centrifugal atomization apparatus |
| CN107116226A (en) * | 2017-03-30 | 2017-09-01 | 华南理工大学 | One kind combination atomization centrifugal rotary rotating disk |
| CN107350477A (en) * | 2017-08-30 | 2017-11-17 | 湖南顶立科技有限公司 | A kind of powder preparing unit |
| CN107552803A (en) * | 2017-09-04 | 2018-01-09 | 泰州市启航石油分析仪器有限公司 | Mechanical centrifugal atomising device centrifugal pan |
| CN109047786B (en) * | 2018-09-25 | 2020-11-24 | 大连理工大学 | Device and method for efficiently preparing spherical metal powder for 3D printing in fibrous splitting mode |
| CN109093128A (en) * | 2018-09-25 | 2018-12-28 | 大连理工大学 | A kind of device and method preparing superfine low melting point globular metallic powder by drop atomization |
| CN109175392A (en) * | 2018-09-25 | 2019-01-11 | 大连理工大学 | One kind is by drop centrifugal atomization Special turntable structure |
| CN109128206B (en) * | 2018-09-25 | 2020-11-24 | 中国人民解放军陆军装甲兵学院 | Device and method for efficiently preparing superfine spherical metal powder by droplet-by-droplet centrifugal atomization method |
| CN109047785A (en) * | 2018-09-25 | 2018-12-21 | 大连理工大学 | A kind of device and method efficiently preparing low melting point globular metallic powder by drop centrifugal atomization |
| CN109014226A (en) * | 2018-09-25 | 2018-12-18 | 大连理工大学 | A kind of device and method preparing 3D printing globular metallic powder |
| CN109014227A (en) * | 2018-09-25 | 2018-12-18 | 大连理工大学 | A kind of device and method preparing superfine spherical metal powder by drop centrifugal atomization |
| CN109093127B (en) * | 2018-09-25 | 2020-11-24 | 中国人民解放军陆军装甲兵学院 | Device and method for preparing spherical metal powder based on uniform droplet one-by-one atomization method |
-
2018
- 2018-09-25 CN CN201811116502.5A patent/CN109175392A/en active Pending
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- 2019-09-25 WO PCT/CN2019/107705 patent/WO2020063627A1/en active Application Filing
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| CA3113748A1 (en) | 2020-04-02 |
| CN109175392A (en) | 2019-01-11 |
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