CN108907215A - A kind of preparation method of 30Cr metal powder - Google Patents
A kind of preparation method of 30Cr metal powder Download PDFInfo
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- CN108907215A CN108907215A CN201810893787.7A CN201810893787A CN108907215A CN 108907215 A CN108907215 A CN 108907215A CN 201810893787 A CN201810893787 A CN 201810893787A CN 108907215 A CN108907215 A CN 108907215A
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- electrode bar
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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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Abstract
The invention discloses a kind of preparation methods of 30Cr metal powder, are related to the preparation field of metal powder.To solve the preparation of existing 30Cr metal powder there are production technology complexity, powder is easy to oxidize and the not high problem of sphericity.This method includes：30Cr electrode bar will be processed into using the 30Cr bar of process for vacuum induction smelting preparation, the diameter of the 30Cr electrode bar is between 10~180mm, and for length between 200~1000mm, roundness deviation is less than 0.05mm, straightness deviation is less than 0.01mm/m, and roughness is less than 1.6 μm；The first end of the 30Cr electrode bar is protruded into spray chamber, the second end of the 30Cr electrode bar is connect with high speed rotation driving device；The 30Cr electrode bar, with the rotation of 5000~150000r/min speed, is arranged in the indoor plasma torch of atomization and heats to the second end of the high-speed rotating 30Cr electrode bar, form 30Cr metal powder under high speed rotation driving device drive.
Description
Technical field
The present invention relates to the preparation fields of metal powder, more particularly relate to a kind of preparation method of 30Cr metal powder.
Background technique
The metal component of 30Cr metal powder preparation has high mechanical strength and harden ability, and 30Cr metal powder has been at present
It is widely used in the powder such as hot isostatic pressing, metal injection moulding, laser near-net-shape technology, the forming of electron beams/laser selective melting
Last metallurgical technology field.These fields require 30Cr powdered steel to have high sphericity, low oxygen content, low impurity content and granularity
The features such as being evenly distributed.
There is production technology complexity in existing powder process such as physical method, chemical method, powder is easy to oxidize and ball
The problems such as shape degree is not high.
Summary of the invention
The embodiment of the present invention provides a kind of preparation method of 30Cr metal powder, to solve existing 30Cr metal powder
Preparation is there are production technology complexity, and powder is easy to oxidize and the not high problem of sphericity.
The embodiment of the present invention provides a kind of preparation method of 30Cr metal powder, including：
30Cr electrode bar will be processed into using the 30Cr bar of process for vacuum induction smelting preparation, the 30Cr electrode bar
Diameter is between 10~180mm, and for length between 200~1000mm, roundness deviation is less than 0.05mm, and straightness deviation is small
In 0.01mm/m, roughness is less than 1.6 μm；
The first end of the 30Cr electrode bar is protruded into spray chamber, the second end and high speed rotation of the 30Cr electrode bar
Driving device connection；
The 30Cr electrode bar is under high speed rotation driving device drive, with the rotation of 5000~150000r/min speed
Turn, the indoor plasma torch of atomization is set, the second end of the high-speed rotating 30Cr electrode bar is heated, formed
30Cr metal powder.
Further, the 30Cr electrode bar is under high speed rotation driving device drive, with 5000~150000r/
Before the rotation of min speed, further include：
The spray chamber is vacuumized, so that the vacuum degree of the spray chamber reaches 5 × 10-3Pa；
When the vacuum degree of the spray chamber reaches 5 × 10-3After Pa, it is straight into the spray chamber to be filled with inert protective gas
Extremely the pressure of the spray chamber is between 0.04~0.08Mpa.
Further, after the formation 30Cr metal powder, further include：
The 30Cr powder of formation is sieved and encapsulated in inert protective atmosphere.
Further, the heating power of the plasma torch is directly proportional to the diameter of the 30Cr electrode bar, wherein institute
The heating power of plasma torch is stated between 20~500kW.
Further, the high speed rotation driving device is high-speed motor；Or
The high speed rotation driving device is multi roll drive mechanism.
Further, the plasma torch is non-diverting camber plasma torch；Or
The plasma torch is transfer camber plasma torch.
The embodiment of the present invention provides a kind of preparation method of 30Cr metal powder, including：Vacuum induction melting skill will be used
The 30Cr bar of art preparation is processed into 30Cr electrode bar, and between 10~180mm, length is situated between the diameter of the 30Cr electrode bar
Between 200~1000mm, roundness deviation is less than 0.05mm, and straightness deviation is less than 0.01mm/m, and roughness is less than 1.6 μm；
The first end of the 30Cr electrode bar is protruded into spray chamber, the second end and high speed rotation driving device of the 30Cr electrode bar
Connection；The 30Cr electrode bar is rotated under high speed rotation driving device drive with 5000~150000r/min speed,
The indoor plasma torch of atomization is arranged in heat the second end of the high-speed rotating 30Cr electrode bar, forms 30Cr
Metal powder.Sphericity >=90% for the 30Cr powder that this method is prepared by plasma rotating electrode atomization powder-making technique, tool
Have the advantages that good fluidity and compressibility are good；The partial size of the 30Cr powder prepared by this method concentrates on 10~200 μm, can lead to
Toning turn over speed realizes different particle size interval distributions；The oxygen increment of the 30Cr powder of preparation is low, impurity content is low；Using the skill
The 30Cr powder of art preparation has the advantages that large specific surface area, sintering character are good.Meanwhile this method has with short production cycle, cost
Low, free of contamination advantage.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of preparation method flow diagram of 30Cr metal powder provided in an embodiment of the present invention；
Fig. 2 is 30Cr powder morphology figure provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is a kind of preparation method flow diagram for 30Cr metal powder that the embodiment of the present invention mentions, as shown in Figure 1,
This method mainly includes the following steps that：
Step 101,30Cr electrode bar, the 30Cr will be processed into using the 30Cr bar of process for vacuum induction smelting preparation
The diameter of electrode bar is between 10~180mm, and for length between 200~1000mm, roundness deviation is less than 0.05mm, straight line
It spends deviation and is less than 0.01mm/m, roughness is less than 1.6 μm；
Step 102, the first end of the 30Cr electrode bar is protruded into spray chamber, the second end of the 30Cr electrode bar with
The connection of high speed rotation driving device；
Step 103, the 30Cr electrode bar is under high speed rotation driving device drive, with 5000~150000r/
The indoor plasma torch of atomization is arranged in the second end of the high-speed rotating 30Cr electrode bar in the rotation of min speed
Heating forms 30Cr metal powder.
In a step 101, it before 30Cr bar is processed into 30Cr electrode bar, needs first to prepare 30Cr bar.In reality
In the application of border, 30Cr bar is the ingredient composition according to 30Cr, and the ingredient composition of 30Cr is used process for vacuum induction smelting system
For at 30Cr bar.In embodiments of the present invention, the specific method for preparing 30Cr bar to process for vacuum induction smelting does not limit
It is fixed.
Further, the 30Cr bar prepared is subjected to fine Vehicle Processing, forms 30Cr electrode bar, implemented in the present invention
In example, the diameter of 30Cr electrode bar is between 10~180mm, and between 200~1000mm, roundness deviation is less than length
0.05mm, straightness deviation are less than 0.01mm/m, and roughness is less than 1.6 μm.
In a step 102, the first end of 30Cr electrode bar is protruded into spray chamber, by the second end of 30Cr electrode bar and height
Fast rotation drive device connection.It should be noted that the first end when 30Cr electrode bar protrudes into spray chamber, 30Cr electrode bar
It after second end is connect with high speed rotation driving device, needs to carry out vacuum pumping to spray chamber, when the indoor vacuum of atomization
Degree reaches 5 × 10-3After Pa, inert protective gas is being filled with into spray chamber, until the pressure of spray chamber reach 0.04~
Between 0.08Mpa.
It should be noted that high speed rotation driving device can be through the direct band of high-speed motor in the embodiment of the present invention
Dynamic bar high-speed rotation, is also possible to the multi roll drive mechanism by frictional wheel drive principle.In embodiments of the present invention, right
The concrete type of high speed rotation driving device is without limitation.
In step 103, it after the vacuum degree of spray chamber and pressure all reach requirement, can star and 30Cr motor stick
The high speed rotating unit of connection, 30Cr electrode bar drive 30Cr electrode bar to carry out high speed rotation under high speed rotating unit drive.
In embodiments of the present invention, since the first end of 30Cr electrode bar is extend into spray chamber, when 30Cr electrode bar is in high speed rotation
Under device drives, 30Cr electrode bar carries out high speed rotation in spray chamber, correspondingly, also starting setting be atomized it is indoor it is equal from
Sub- torch, plasma torch are heated to the indoor motor plane rod end of atomization is protruded into, and motor plane rod end melted by heat forms liquid
Film, the high-speed rotating centrifugal force of electrode bar throw away liquid film to form drop, and drop cools down rapidly in inert atmosphere in spray chamber
Solidification, forms spherical powder under surface tension effects.
It should be noted that in practical applications, the heating power for being atomized indoor plasma torch is arranged in, with 30Cr
The diameter of electrode bar is directly proportional, i.e. the diameter of 30Cr electrode bar is bigger, and the heating power of plasma torch is higher, of the invention real
It applies in example, the heating power of plasma torch is between 20~500kW.
In embodiments of the present invention, plasma torch can be non-diverting camber plasma torch, be also possible to electrode bar
Expect the transfer camber plasma torch as consumable anode.In embodiments of the present invention, not to the concrete type of plasma torch
It limits.
Further, after forming 30Cr metal powder, the 30Cr powder in inert protective atmosphere to formation is needed
It is sieved and is encapsulated.
In order to the clearer preparation method for introducing 30Cr metal powder provided in an embodiment of the present invention, individually below
The preparation method of 30Cr metal powder is introduced with 1~embodiment of embodiment 3.
Embodiment 1
Step 201, by the ingredient composition of 30Cr, 30Cr bar is smelted into using process for vacuum induction smelting.
Step 202, the 30Cr of melting being subjected to finishing processing into electrode bar, the diameter of the electrode bar after processing is 10mm,
Length is 200mm, and roundness deviation is less than 0.05mm, and straightness deviation is less than 0.01mm/m, and roughness is less than 1.6 μm.
Step 203, electrode bar one end is installed in high speed rotation driving device, the other end is extend into spray chamber
Portion.
Step 204,5 × 10 are evacuated to spray chamber by vacuum system-3Then Pa fills inertia protection gas to spray chamber
Body is to positive pressure 0.04Mpa.
Step 205, start high speed rotation driving device, electrode bar is driven to revolve with 10000~150000r/min high speed
Turn；
Step 206, starting is mounted on the indoor plasma torch of atomization, to protrude into the indoor electrode bar end face of atomization into
Row heating.Corresponding plasma torch heating power 20kW.Bar end face melted by heat forms liquid film, electrode bar high speed rotation
Centrifugal force liquid film is thrown away to form drop, drop rapid cooled and solidified in inert atmosphere in spray chamber is made in surface tension
With lower formation spherical powder.
Step 207, the 30Cr powder of preparation is sieved and is encapsulated in inert protective atmosphere.
Embodiment 2
Plasma rotating electrode atomization technology prepares 30Cr powder, includes the following steps：
Step 301, by the ingredient composition of 30Cr, 30Cr bar is smelted into using process for vacuum induction smelting.
Step 302, the 30Cr stick of melting is subjected to finishing processing into electrode bar, the diameter of the electrode bar after processing is
180mm, length 1000mm, roundness deviation are less than 0.05mm, and straightness deviation is less than 0.01mm/m, and roughness is less than 1.6 μm.
Step 303, electrode bar one end is installed in high speed rotation driving device, the other end is extend into spray chamber
Portion.
Step 304,5 × 10 are evacuated to spray chamber by vacuum system-3Then Pa fills inertia protection gas to spray chamber
Body is to positive pressure 0.08Mpa.
Step 305, start high speed rotation driving device, drive electrode bar with 5000~30000r/min high speed rotation；
Step 306, starting is mounted on the indoor plasma torch of atomization, to protrude into the indoor electrode bar end face of atomization into
Row heating.Corresponding plasma torch heating power 500kW.Bar end face melted by heat forms liquid film, and electrode bar high speed is revolved
The centrifugal force turned throws away liquid film to form drop, drop rapid cooled and solidified in inert atmosphere in spray chamber, in surface tension
Spherical powder is formed under effect.
Step 307, the 30Cr powder of preparation is sieved and is encapsulated in inert protective atmosphere.
Embodiment 3
Plasma rotating electrode atomization technology prepares 30Cr powder, includes the following steps：
Step 401, by the ingredient composition of 30Cr, 30Cr bar is smelted into using process for vacuum induction smelting.
Step 402, the 30Cr stick of melting is subjected to finishing processing into electrode bar, the diameter of the electrode bar after processing is
150mm, length 600mm, roundness deviation are less than 0.05mm, and straightness deviation is less than 0.01mm/m, and roughness is less than 1.6 μm.
Step 403, electrode bar one end is installed in high speed rotation driving device, the other end is extend into spray chamber
Portion.
Step 404,5 × 10 are evacuated to spray chamber by vacuum system-3Then Pa fills inertia protection gas to spray chamber
Body is to positive pressure 0.05Mpa.
Step 405, start high speed rotation driving device, drive electrode bar with 8000~150000r/min high speed rotation；
Step 406, starting is mounted on the indoor plasma torch of atomization, to protrude into the indoor electrode bar end face of atomization into
Row heating.Corresponding plasma torch heating power 300kW.Bar end face melted by heat forms liquid film, and electrode bar high speed is revolved
The centrifugal force turned throws away liquid film to form drop, drop rapid cooled and solidified in inert atmosphere in spray chamber, in surface tension
Spherical powder is formed under effect.
Step 407, the 30Cr powder of preparation is sieved and is encapsulated in inert protective atmosphere.
In conclusion the embodiment of the present invention provides a kind of preparation method of 30Cr metal powder, including：Vacuum sense will be used
The 30Cr bar for answering melting technique to prepare is processed into 30Cr electrode bar, the diameter of the 30Cr electrode bar between 10~180mm it
Between, for length between 200~1000mm, roundness deviation is less than 0.05mm, and straightness deviation is less than 0.01mm/m, and roughness is small
In 1.6 μm；The first end of the 30Cr electrode bar is protruded into spray chamber, the second end and high speed rotation of the 30Cr electrode bar
Driving device connection；The 30Cr electrode bar is under high speed rotation driving device drive, with 5000~150000r/min speed
Degree rotation is arranged in the indoor plasma torch of atomization and heats to the second end of the high-speed rotating 30Cr electrode bar,
Form 30Cr metal powder.The sphericity for the 30Cr powder that this method is prepared by plasma rotating electrode atomization powder-making technique >=
90%, have the advantages that good fluidity and compressibility are good；The partial size of the 30Cr powder prepared by this method concentrates on 10~200
μm, different particle size interval distributions can be realized by adjusting revolving speed；The oxygen increment of the 30Cr powder of preparation is low, impurity content is low；
Have the advantages that large specific surface area, sintering character are good using 30Cr powder prepared by the technology.Meanwhile this method has the production cycle
Short, at low cost, free of contamination advantage.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of preparation method of 30Cr metal powder, which is characterized in that including：
30Cr electrode bar, the diameter of the 30Cr electrode bar will be processed into using the 30Cr bar of process for vacuum induction smelting preparation
Between 10~180mm, for length between 200~1000mm, roundness deviation is less than 0.05mm, and straightness deviation is less than
0.01mm/m, roughness is less than 1.6 μm；
The first end of the 30Cr electrode bar is protruded into spray chamber, the second end and high speed rotation of the 30Cr electrode bar drive
Device connection；
The 30Cr electrode bar is under high speed rotation driving device drive, with the rotation of 5000~150000r/min speed, if
It sets and the second end of the high-speed rotating 30Cr electrode bar is heated in the indoor plasma torch of atomization, form 30Cr gold
Belong to powder.
2. preparation method as described in claim 1, which is characterized in that the 30Cr electrode bar drives in the high speed rotation and fills
It sets under drive, before the rotation of 5000~150000r/min speed, further includes：
The spray chamber is vacuumized, so that the vacuum degree of the spray chamber reaches 5 × 10-3Pa；
When the vacuum degree of the spray chamber reaches 5 × 10-3After Pa, inert protective gas is filled with into the spray chamber until institute
The pressure of spray chamber is stated between 0.04~0.08Mpa.
3. preparation method as claimed in claim 2, which is characterized in that after the formation 30Cr metal powder, further include：
The 30Cr powder of formation is sieved and encapsulated in inert protective atmosphere.
4. preparation method as described in claim 1, which is characterized in that the heating power of the plasma torch and the 30Cr
The diameter of electrode bar is directly proportional, wherein the heating power of the plasma torch is between 20~500kW.
5. preparation method as described in claim 1, which is characterized in that the high speed rotation driving device is high-speed motor；Or
Person
The high speed rotation driving device is multi roll drive mechanism.
6. preparation method as described in claim 1, which is characterized in that the plasma torch is non-diverting camber plasma fire
Torch；Or
The plasma torch is transfer camber plasma torch.
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| CN201810893787.7A CN108907215A (en) | 2018-08-07 | 2018-08-07 | A kind of preparation method of 30Cr metal powder |
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| CN201810893787.7A CN108907215A (en) | 2018-08-07 | 2018-08-07 | A kind of preparation method of 30Cr metal powder |
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