CN110014158A - A kind of method that aerosolization prepares spherical chromium powder - Google Patents
A kind of method that aerosolization prepares spherical chromium powder Download PDFInfo
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- CN110014158A CN110014158A CN201910322947.7A CN201910322947A CN110014158A CN 110014158 A CN110014158 A CN 110014158A CN 201910322947 A CN201910322947 A CN 201910322947A CN 110014158 A CN110014158 A CN 110014158A
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- chromium
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- aerosolization
- chromium powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y70/00—Materials specially adapted for additive manufacturing
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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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention discloses a kind of methods that aerosolization prepares spherical chromium powder, belong to powder metallurgical technology.Specific method step includes: 1) chromium powder preparation, and chromium block is carried out cryogrinding and is crushed powder processed, temperature is controlled at -50~10 DEG C；2) it suppresses, chromium powder is packed into gum cover and is shaken, is suppressed after reversed pier material, pressure is 150MPa~300MPa, dwell time 5min-15min；3) it is sintered, the chromium stick suppressed is packed into vacuum sintering furnace and be sintered, sintering maximum temperature control is at 1000 DEG C~1200 DEG C, 30~480min of soaking time, vacuum degree < 100pa；4) chromium stick after sintering is packed into EIGA (aerosolization of rotation electrode induction melting vacuum) and carries out powder processed, 10~40Kw of heating power by aerosolization EIGA.The advantages of spherical shape chromium powder prepared by the present invention, is with high purity, gas content is low, good sphericity, and the distribution of chromium powder particle size range is wide.
Description
Technical field
The present invention relates to a kind of methods that aerosolization prepares spherical chromium powder, belong to powder metallurgical technology.
Background technique
In recent years, with the continuous development of 3D printing technique, field of powder metallurgy is had been to be concerned by more and more people.Metal
Chromium due to good chemical stability, high temperature resistant property and it is corrosion-resistant the features such as, be often applied to metallurgy, chemical industry, plating, pharmacy
Etc. industries.Currently, the chromium powder that conventional powder-making technique is produced is generally irregular shape, to cause chromium powder poor fluidity
And its disadvantages such as pulverulent product consistency is low.In order to improve the mobility of powder, a kind of spherical chromium powder is prepared to study.
The method for producing spherical chromium powder both at home and abroad at present has radio frequency plasma method, and radio frequency plasma has energy density
The advantages that high, heating intensity is greatly, the volume of plasma torch is big, processing material technology is simple.The irregular chromium powder of stock material shapes
Particle is sprayed into plasmatorch by carrying gas by feeding gun, is heated rapidly and is melted, and the very high drop of sphericity is formed,
And quick solidification in a very short period of time, so that spherical chromium powder is formed, but plasma method prepares chromium powder good sphericity, but gas
Body content is difficult to control, the method higher cost, since feeding method limitation can not prepare fine powder of the partial size less than 45 μm.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of method that aerosolization prepares spherical chromium powder.
The technical solution of the present invention is as follows: a kind of method that aerosolization prepares spherical chromium powder, specific method step include:
S1: chromium powder preparation: chromium block is subjected to grinding and is crushed, chromium powder is made；
S2: compacting: chromium powder is packed into gum cover and carries out vibration and reversed pier material, is then pressed into chromium stick；
S3: sintering: the chromium stick suppressed is packed into vacuum sintering furnace and is sintered；
S4: aerosolization EIGA: chromium stick after sintering being packed into EIGA and carries out powder processed.
Further, in the step S1, before being ground to chromium block, removal surface flaw-piece, oxidation film and nitrogen film.
Further, step S1 specific steps are as follows:
1) at a temperature of -50 DEG C~10 DEG C of water coolings, chromium block is mechanically pulverized using hydraulic boulder crusher, is broken into it
Particle；
2) 1) particle made of is carried out low temperature shock and ground by the black brittleness for utilizing chromium in the case where temperature is -50~10 DEG C
Mill, the low temperature shock grinding is to utilize nanometer Al2O3With ZrO2The vibration mill tube that the high tenacity ceramic material being mixed to prepare is made
What body lining and abrasive body carried out, manufactured chromium powder grain shape rule.
Further, compacting described in step S2 uses cold isopressing method, and pressure is 150MPa~300MPa, when pressure maintaining
Between be 5min~15min, when boosting, feed powder internal gas can be discharged, reduce the stomata of chromium stick；When pressure maintaining, it can increase
Particle deformation, to improve the density of powder green compact, the chromium stick idiosome intensity of formation is big, density is high and uniform.
Further, in the step S3, the control of the maximum temperature of the sintering is at 1000 DEG C~1200 DEG C, soaking time
30~480min, vacuum degree < 100pa.
Further, the aerosolization EIGA in step S3 is by heated by electrodes, and chromium stick is fused into chrome liquor, and chrome liquor is from nozzle
In it is continuous vertical toward flowing down, chrome liquor atomization is broken into a large amount of tiny drops by high pressure argon gas air-flow by close-coupled nozzle, carefully
Small drop is awing frozen into spherical chromium powder particle, the particle good sphericity of formation, and the particle size range of chromium powder is wide, purity
Height, good fluidity；Wherein, heating power is 10~40Kw.
Further, in step S3, it is 600~800m/s, the gas and molten metal that high pressure argon gas air-flow, which sprays rate,
Flow-rate ratio be 5~25:1.
The beneficial effects of the present invention are:, using the black brittleness of chromium, temperature is controlled at -50~10 DEG C, low when preparing chromium powder
Temperature grinding, can be improved grinding efficiency, save the time；Chromium stick, manufactured chromium stick idiosome intensity are suppressed using cold isopressing method
Greatly, density is high and uniform；Gas-atomized powder, close coupling spray in rotation electrode induction aerosolization smelting furnace by sintered chromium stick
Chrome liquor atomization is broken into a large amount of tiny drops by high pressure argon gas air-flow by mouth, and tiny drop is awing frozen into spherical shape
Chromium powder particle, the particle good sphericity of formation, particle size range is wide, and purity is high, good fluidity, gas content controls well, be not required to through
Calcining and the processing of other middle process are crossed, production cost is reduced, shortens the production cycle, continuous-stable is operated, improves life
Produce efficiency.
Detailed description of the invention
Fig. 1 is spherical chromium powder 50X metallographic structure prepared by the present invention；
Fig. 2 is spherical chromium powder 200X metallographic structure prepared by the present invention.
Specific embodiment
Embodiment 1
Chromium block surface flaw-piece, oxidation film and nitrogen film are first removed, at a temperature of -50 DEG C of water coolings, using hydraulic boulder crusher to chromium
Block is mechanically pulverized, it is made to be broken into particle；By particle at -50 DEG C, vibro-grinding is carried out, chromium powder is made, chromium powder is filled
Entering in gum cover and is shaken, suppressed after reversed pier material, pressure 150MPa, dwell time 5min is pressed into chromium stick,
The chromium stick suppressed is packed into vacuum sintering furnace and is sintered, sintering maximum temperature control is 1000 DEG C, soaking time
Sintered chromium stick loading EIGA is carried out powder processed, heating power 10Kw by 30min, vacuum degree < 100pa；The spherical chromium prepared
Powder Particle Size is distributed in 35-45 μm.
Embodiment 2
Chromium block surface flaw-piece, oxidation film and nitrogen film are first removed, at a temperature of water cooling, chromium block is carried out using hydraulic boulder crusher
It is mechanically pulverized, it is made to be broken into particle；By particle at 10 DEG C, vibro-grinding is carried out, chromium powder is made, chromium powder is packed into gum cover
And shaken, suppressed after reversed pier material, pressure 300MPa, dwell time 20min is pressed into chromium stick, will suppress
Good chromium stick is packed into vacuum sintering furnace and is sintered, and sintering maximum temperature control is 1200 DEG C, soaking time 480min, vacuum
Sintered chromium stick loading EIGA is carried out powder processed, heating power 40Kw by degree < 100pa；The spherical chromium powder size distribution prepared
At 15-25 μm.
Embodiment 3
Chromium block surface flaw-piece, oxidation film and nitrogen film are first removed, at a temperature of water cooling, chromium block is carried out using hydraulic boulder crusher
It is mechanically pulverized, it is made to be broken into particle；By particle at -20 DEG C, vibro-grinding is carried out, chromium powder is made, chromium powder is packed into gum cover
It is interior and shaken, suppressed after reversed pier material, pressure 225MPa, dwell time 12.5min, it is pressed into chromium stick, it will
The chromium stick suppressed is packed into vacuum sintering furnace and is sintered, and sintering maximum temperature control is 1100 DEG C, soaking time 240min,
Sintered chromium stick loading EIGA is carried out powder processed, heating power 25Kw by vacuum degree < 100pa；The spherical chromium powder granularity prepared
It is distributed in 25-35 μm.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify to technical solution documented by previous embodiment or equivalent replacement of some of the technical features；And
These are modified or replaceed, the spirit and model of technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (7)
1. a kind of method that aerosolization prepares spherical chromium powder, which is characterized in that specific method step includes:
S1: chromium powder preparation: chromium block is subjected to grinding and is crushed, chromium powder is made；
S2: compacting: chromium powder is packed into gum cover and carries out vibration and reversed pier material, is then pressed into chromium stick；
S3: sintering: the chromium stick suppressed is packed into vacuum sintering furnace and is sintered；
S4: aerosolization EIGA: chromium stick after sintering being packed into EIGA and carries out powder processed.
2. the method that a kind of aerosolization as described in claim 1 prepares spherical chromium powder, which is characterized in that in the step S1,
Before being ground to chromium block, removal surface flaw-piece, oxidation film and nitrogen film.
3. the method that a kind of aerosolization as described in claim 1 prepares spherical chromium powder, which is characterized in that step S1 specific steps
Are as follows:
1) at a temperature of -50 DEG C~10 DEG C of water coolings, chromium block is mechanically pulverized using hydraulic boulder crusher, is broken into it
Grain；
2) black brittleness for utilizing chromium carries out low temperature shock grinding, the low temperature shock grinding in the case where temperature is -50~10 DEG C
It is to utilize nanometer Al2O3With ZrO2The vibromill Shell Lining and abrasive body that the high tenacity ceramic material being mixed to prepare is made carry out
's.
4. the method that a kind of aerosolization as described in claim 1 prepares spherical chromium powder, which is characterized in that pressed described in step S2
System uses cold isopressing method, and pressure is 150MPa~300MPa, and the dwell time is 5min~15min.
5. the method that a kind of aerosolization as described in claim 1 prepares spherical chromium powder, which is characterized in that pressed described in step S2
System uses cold isopressing method, and pressure is 150MPa~300MPa.
6. the method that a kind of aerosolization as described in claim 1 prepares spherical chromium powder, which is characterized in that in the step S3,
The maximum temperature of the sintering is controlled at 1000 DEG C~1200 DEG C, 30~480min of soaking time, vacuum degree < 100pa.
7. the method that a kind of aerosolization as described in claim 1 prepares spherical chromium powder, which is characterized in that the aerosol in step S3
Change EIGA by heated by electrodes, chromium stick is fused into chrome liquor, chrome liquor is continuous vertical toward flowing down from nozzle, and close-coupled nozzle passes through
Chrome liquor atomization is broken into a large amount of tiny drops by high pressure argon gas air-flow, and tiny drop is awing frozen into spherical chromium powder
Grain, wherein heating power is 10~40Kw.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111922351A (en) * | 2020-09-23 | 2020-11-13 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of high-purity low-oxygen metal chromium powder |
| CN111922350A (en) * | 2020-09-22 | 2020-11-13 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of low-hydrochloric-acid-insoluble metal chromium powder |
| CN112719279A (en) * | 2021-04-01 | 2021-04-30 | 陕西斯瑞新材料股份有限公司 | Preparation method of CuCrZr alloy powder for 3D printing |
| CN112828296A (en) * | 2020-12-30 | 2021-05-25 | 中航迈特粉冶科技(固安)有限公司 | Preparation method of chromium powder |
| CN114713832A (en) * | 2022-04-26 | 2022-07-08 | 哈尔滨工业大学 | High-hardness wear-resistant spherical titanium-based composite powder and preparation method thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111922350A (en) * | 2020-09-22 | 2020-11-13 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of low-hydrochloric-acid-insoluble metal chromium powder |
| CN111922350B (en) * | 2020-09-22 | 2021-01-01 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of low-hydrochloric-acid-insoluble metal chromium powder |
| CN111922351A (en) * | 2020-09-23 | 2020-11-13 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of high-purity low-oxygen metal chromium powder |
| CN111922351B (en) * | 2020-09-23 | 2021-01-01 | 西安斯瑞先进铜合金科技有限公司 | Preparation method of high-purity low-oxygen metal chromium powder |
| CN112828296A (en) * | 2020-12-30 | 2021-05-25 | 中航迈特粉冶科技(固安)有限公司 | Preparation method of chromium powder |
| CN112719279A (en) * | 2021-04-01 | 2021-04-30 | 陕西斯瑞新材料股份有限公司 | Preparation method of CuCrZr alloy powder for 3D printing |
| CN112719279B (en) * | 2021-04-01 | 2021-06-29 | 陕西斯瑞新材料股份有限公司 | Preparation method of CuCrZr alloy powder for 3D printing |
| CN114713832A (en) * | 2022-04-26 | 2022-07-08 | 哈尔滨工业大学 | High-hardness wear-resistant spherical titanium-based composite powder and preparation method thereof |
| CN114713832B (en) * | 2022-04-26 | 2024-05-03 | 哈尔滨工业大学 | High-hardness wear-resistant spherical titanium-based composite powder and preparation method thereof |
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