Device and method for defending planet in atomizing chamber

Abstract

The invention relates to the field of powder metallurgy, and discloses a planet defending device and method for an atomizing chamber. The planet defending device for the atomizing chamber comprises an arc-shaped baffle, the arc-shaped baffle comprises an arc-shaped fixing base and a baffle body, the arc-shaped baffle body is fixed to the side wall of the atomizing chamber through the arc-shaped fixing base, the arc-shaped fixing base comprises an outer contact face and an inner blocking face, and an acute angle is formed between the outer contact face and the side wall of the atomizing chamber in the direction of the inner blocking face. The position of the outer contact surface in the horizontal direction does not exceed the position of the feed port of the atomizing chamber; the baffle is in smooth connection with the arc-shaped fixing base, the acute angle formed by the baffle and the side wall of the atomizing chamber in the direction of the inner blocking face is smaller than the acute angle formed by the outer contact face and the side wall of the atomizing chamber in the direction of the inner blocking face, the free end of the baffle is an inclined face, and the inclined face inclines towards the direction of the inner blocking face in the vertical direction. Cooled and solidified fine powder particles are prevented from colliding with liquid particles or semi-liquid particles on the lower middle portion of the atomization area, and the forming degree of a satellite ball is reduced.

Description

Technical Field

[0001] The invention relates to the field of powder metallurgy, and in particular to a device and method for preventing satellites in an atomizing chamber. Background Art

[0002] Inert gas atomization is a technology used to prepare metal powders. Under the action of high-pressure inert gas, high-temperature molten metal or alloy droplets are dispersed into fine droplets. The droplets solidify into powder particles during the cooling process, and can be collected and post-processed by a collection device. Since inert gas does not easily react chemically with metals, it can effectively prevent metals from oxidizing at high temperatures or reacting with other impurities. Inert gas atomization has the advantages of high purity, good sphericity, controllable particle size, and high production efficiency. It is suitable for the production of ultrafine powders such as metal 3D printing, powder metallurgy, and cold spraying, and is widely used in aerospace, medical, and automotive manufacturing industries.

[0003] Despite this, the inert gas atomization method also faces many technical challenges, such as high equipment cost, high energy consumption, difficult process control, and environmental pollution. At the same time, as the powder particle size continues to decrease, especially nano-powders, the surface of powders with larger particles and not completely solidified will collide and bond to form "satellite balls" to varying degrees, which will affect the fluidity and loose density of the powder and affect its performance. For aerosolization, how to prevent the fine powder carried in the backflow zone from adsorbing and bonding with the large-particle powder that has not been completely solidified on the upper part, reduce the degree of "satellite ball" formation and improve powder performance has become a problem that needs to be solved urgently. Summary of the invention

[0004] The present invention aims to provide a device and method for preventing satellite balls in an atomization chamber, so as to prevent the fine powder particles that have been cooled and solidified from colliding with the liquid particles or semi-liquid particles in the middle and lower part of the atomization zone, reduce the degree of "satellite ball" formation, and improve the powder performance and powder sphericity.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A device for preventing satellites from entering an atomizing chamber comprises an arc-shaped baffle, the arc-shaped baffle comprises an arc-shaped fixing seat and a baffle, the arc-shaped baffle is fixed on the side wall of the atomizing chamber through the arc-shaped fixing seat, the arc-shaped fixing seat comprises an outer contact surface and an inner baffle, the outer contact surface forms an acute angle with the side wall of the atomizing chamber along the direction of the inner baffle, and the position of the outer contact surface in the horizontal direction does not exceed the position of the feed port of the atomizing chamber; the inner baffle is an arc-shaped angle, the baffle is smoothly connected to the arc-shaped fixing seat, the acute angle formed by the baffle and the side wall of the atomizing chamber along the direction of the inner baffle is smaller than the acute angle formed by the outer contact surface and the side wall of the atomizing chamber along the direction of the inner baffle, and the free end of the baffle is an inclined surface, and the inclined surface is inclined toward the inner baffle in the vertical direction.

[0007] The principle and advantages of this scheme are as follows: in actual application, an arc-shaped baffle is fixed on the side wall of the atomizing chamber, and the position of the external contact surface in the horizontal direction does not exceed the position of the atomizing chamber feed port. In the process of transporting the metal or alloy raw material heated to a molten state in the smelting furnace from the atomizing chamber feed port to the atomizing chamber through the nozzle, the contact between the raw material and the external contact surface can be reduced, and the accumulation of the external contact surface can be reduced; the inert gas is sprayed onto the molten metal droplets, stretching them into a liquid film and breaking them into fine metal droplets. The fine metal droplets are rapidly solidified into powder particles under the cooling effect of the inert gas, and the external contact surface is cooled by the inert gas. The contact surface forms an acute angle with the side wall of the atomization chamber along the direction of the inner stop surface, the acute angle formed by the baffle plate and the side wall of the atomization chamber along the direction of the inner stop surface is smaller than the acute angle formed by the outer contact surface and the side wall of the atomization chamber along the direction of the inner stop surface, and the free end of the baffle plate is an inclined surface to reduce the accumulation of powder on the surface of the arc-shaped baffle plate; under the influence of high-pressure inert gas, the arc-shaped angle of the inner stop surface can reduce the impact force of the reflow zone, and the arc-shaped baffle plate can shorten the height of the reflow zone in the atomization chamber, blocking the collision of the fine powder particles that have been cooled and solidified with the liquid particles or semi-liquid particles in the middle and lower part of the atomization zone, thereby avoiding the formation of "satellite balls".

[0008] Preferably, as an improvement, the arc-shaped baffle is made of 316 stainless steel.

[0009] Technical effect: 316 stainless steel has strong corrosion resistance, high hardness and high strength, and the arc-shaped baffle is not easy to deform or corrode.

[0010] Preferably, as an improvement, the acute angle formed between the outer contact surface and the side wall of the atomization chamber along the inner blocking surface direction is smaller than the sliding friction angle of 40° to 44°.

[0011] Technical effect: It makes it easier for individual powders to slide down without forming accumulation, thus preventing the problem of powder residue after atomization.

[0012] Preferably, as an improvement, the arc angle of the inner stop surface is 150° to 160°.

[0013] Technical effect: It is convenient to correspond to the flow direction of gas reflux in the cavity.

[0014] Preferably, as an improvement, the acute angle formed by the baffle plate and the side wall of the atomization chamber along the inner baffle direction is 30° to 36°.

[0015] Technical effect: smaller than the sliding angle, and can increase the aperture at the baffle, effectively ensuring the normal size of the air flow.

[0016] Preferably, as an improvement, the length of the baffle is 1m to 1.2m, and the inner diameter of the baffle is 1.2m to 1.5m.

[0017] Technical effect: The diffusion cone area is larger than the injection area, which prevents the airflow from hitting the wall to form a new backflow, ensures the normal air flow, the normal discharge of the airflow, and prevents the pressurization of the cavity on the partition.

[0018] Preferably, as an improvement, the arc-shaped baffle is fixed to the side wall of the atomization chamber at a height of 1 meter from the ground.

[0019] Technical effect: The powder below the barrier zone has solidified and will not form a "satellite ball" even if a collision occurs.

[0020] A method for preventing satellites from being generated in an atomizing chamber, comprising:

[0021] S1, prepare raw materials;

[0022] S2, heating and melting the raw materials in a heating device;

[0023] S3, spraying the molten metal into the atomization chamber through the nozzle, and simultaneously spraying inert gas to impact the molten metal droplets to break them into fine particles;

[0024] S4, cooling and solidifying to form metal powder particles;

[0025] S5, the arc-shaped baffle blocks the fine metal powder particles that have been cooled and solidified from colliding with the liquid particles or semi-liquid particles in the middle and lower part of the atomization zone;

[0026] S6, collecting the powder for post-processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic diagram of the structure of a device for preventing satellites from entering atomizing chamber. DETAILED DESCRIPTION

[0028] The following is further described in detail through specific implementation methods:

[0029] The reference numerals in the drawings of the specification include: an arc-shaped fixing seat 1 , an outer contact surface 11 , an inner blocking surface 12 , and a baffle 2 .

[0030] The embodiment is basically as shown in the attached Figure 1 As shown:

[0031] A device for preventing satellites in an atomizing chamber includes an arc-shaped baffle. In this embodiment, the speed of conveying molten metal is 10 kg / s, and the atomization length is determined by the parameters of the atomizer, which is between 0-1.5 cm and 0-4.5 cm below the atomizer; the high-speed airflow is a conical air ring, and the center normal is perpendicular to the ground. Considering that the arc-shaped baffle is continuously impacted in the reflow zone, the material of the arc-shaped baffle is 316 stainless steel, which is convenient for improving the corrosion resistance of the arc-shaped baffle, and the arc-shaped baffle is not easy to deform.

[0032] The arc-shaped baffle comprises an arc-shaped fixing seat 1 and a baffle 2. The arc-shaped baffle is fixed on the side wall of the atomization chamber through the arc-shaped fixing seat 1. The arc-shaped fixing seat 1 is conical, which is convenient for increasing the fixed contact surface, thereby improving stability. The arc-shaped baffle is fixed on the side wall of the atomization chamber at a height of 1 meter from the ground. The powder below the barrier area has been solidified and will not form a "satellite ball" even if a collision occurs.

[0033] The arc-shaped fixing seat 1 includes an outer contact surface 11 and an inner stop surface 12. The outer contact surface 11 forms an acute angle with the side wall of the atomization chamber along the direction of the inner stop surface 12, and the angle is smaller than the sliding friction angle of 40° to 44°, so that individual powders can slide down smoothly without forming accumulation, thereby preventing the problem of powder residue after atomization.

[0034] The horizontal position of the outer contact surface 11 does not exceed the position of the feed port of the atomization chamber, so as to avoid the outer contact surface 11 blocking the feed port, thereby affecting the normal atomization reaction of the atomization chamber.

[0035] The inner blocking surface 12 is in an arc shape with an angle of 150° to 160°, so as to correspond to the flow direction of the gas reflux in the atomization chamber cavity.

[0036] The baffle plate 2 is smoothly connected to the arc-shaped fixing seat 1. The acute angle formed by the baffle plate 2 and the side wall of the atomization chamber along the inner stop surface 12 is smaller than the acute angle formed by the outer contact surface 11 and the side wall of the atomization chamber along the inner stop surface 12. The angle is 30° to 36°, which can increase the aperture at the baffle plate 2 and effectively ensure that the air flow rate is normal.

[0037] The free end of the baffle 2 is an inclined surface, which is inclined in the vertical direction toward the inner baffle 12; the length of the baffle 2 is 1m to 1.2m, and the inner diameter of the baffle 2 is 1.2m to 1.5m. It is larger than the diffusion cone area of ​​the injection to prevent the airflow from hitting the wall to form a new backflow, ensure the normal airflow, the normal discharge of the airflow, and prevent the pressurization of the cavity on the partition.

[0038] A method for preventing satellites from being generated in an atomizing chamber, comprising:

[0039] S1, prepare raw materials;

[0040] S2, heating and melting the raw materials in a heating device;

[0041] S3, spraying the molten metal into the atomization chamber through the nozzle, and simultaneously spraying inert gas to impact the molten metal droplets to break them into fine particles;

[0042] S4, cooling and solidifying to form metal powder particles;

[0043] S5, the arc-shaped baffle blocks the fine metal powder particles that have been cooled and solidified from colliding with the liquid particles or semi-liquid particles in the middle and lower part of the atomization zone;

[0044] S6, collecting the powder for post-processing.

[0045] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A device for preventing satellites from entering a spray chamber, characterized in that: It includes an arc-shaped baffle, which includes an arc-shaped fixing seat and a baffle, and the arc-shaped baffle is fixed on the side wall of the atomization chamber through the arc-shaped fixing seat, and the arc-shaped fixing seat includes an outer contact surface and an inner baffle surface, and the outer contact surface forms an acute angle with the side wall of the atomization chamber along the direction of the inner baffle surface, and the position of the outer contact surface in the horizontal direction does not exceed the position of the feed port of the atomization chamber; the inner baffle surface is an arc angle, and the baffle is smoothly connected to the arc-shaped fixing seat, and the acute angle formed by the baffle and the side wall of the atomization chamber along the direction of the inner baffle surface is smaller than the acute angle formed by the outer contact surface and the side wall of the atomization chamber along the direction of the inner baffle surface, and the free end of the baffle is an inclined surface, and the inclined surface is inclined toward the inner baffle surface in the vertical direction.

2. The device for preventing satellites from being emitted from an atomizing chamber according to claim 1, characterized in that: The material of the arc-shaped baffle is 316 stainless steel.

3. The device for preventing satellites from being emitted from an atomizing chamber according to claim 1, characterized in that: The acute angle formed between the outer contact surface and the side wall of the atomization chamber along the inner blocking surface direction is smaller than the sliding friction angle of 40° to 44°.

4. The device for preventing satellites from being emitted from an atomizing chamber according to claim 1, characterized in that: The arc angle of the inner blocking surface is 150° to 160°.

5. The device for preventing satellites from being emitted from an atomizing chamber according to claim 1, characterized in that: The acute angle formed by the baffle plate and the side wall of the atomization chamber along the inner baffle direction is 30° to 36°.

6. The device for preventing satellites from being emitted from an atomizing chamber according to claim 1, characterized in that: The length of the baffle is 1m to 1.2m, and the inner diameter of the baffle is 1.2m to 1.5m.

7. The device for preventing satellites from being emitted from an atomizing chamber according to claim 1, characterized in that: The arc-shaped baffle is fixed to the side wall of the atomization chamber at a height of 1 meter from the ground.

8. A method for preventing satellites from entering a spray chamber, characterized in that: include: S1, prepare raw materials; S2, heating and melting the raw materials in a heating device; S3, spraying the molten metal into the atomization chamber through the nozzle, and simultaneously spraying inert gas to impact the molten metal droplets to break them into fine particles; S4, cooling and solidifying to form metal powder particles; S5, the arc-shaped baffle blocks the fine metal powder particles that have been cooled and solidified from colliding with the liquid particles or semi-liquid particles in the middle and lower part of the atomization zone; S6, collecting the powder for post-processing.

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