CN103386492A - Preparation method for superfine spherical stainless steel powder - Google Patents
Preparation method for superfine spherical stainless steel powder Download PDFInfo
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- CN103386492A CN103386492A CN201310304846XA CN201310304846A CN103386492A CN 103386492 A CN103386492 A CN 103386492A CN 201310304846X A CN201310304846X A CN 201310304846XA CN 201310304846 A CN201310304846 A CN 201310304846A CN 103386492 A CN103386492 A CN 103386492A
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Abstract
The invention relates to a stainless steel powder preparation method for metal powder injection molding, in particular to a method for preparing superfine spherical stainless steel powder by plasma spherifying. Stable argon plasmas are constructed, and plasma parameters are adjusted, so that a water-atomized irregular stainless steel powder raw material is heated, and is separated to obtain the superfine spherical stainless steel powder after being cooled and cured, and compared with the original water-atomized irregular stainless steel powder raw material, spherified stainless steel powder has higher flowability, tap density and purity. According to the method, the problems of poor flowability, low apparent density, low operational performance and the like caused by irregular shapes such as a flake shape, a strip shape and a branch shape in the conventional water-atomized stainless steel powder are solved, the quality of the stainless steel powder and the performance of a stainless steel product are improved, the added value and the market competitiveness of the water-atomized stainless steel powder are improved, and the method is low in cost.
Description
Technical field
The invention belongs to the preparation method of the powder of stainless steel that a kind of metal powder injection molding uses, be specifically related to a kind of preparation method of minute spherical powder of stainless steel.
Background technology
The Novel powder metallurgy near-net-shape technology that current international field of powder metallurgy is with fastest developing speed, the most with potential applications, be described as the most popular current parts technology of preparing.Along with the development of modern PM technique, sintered metal product is just towards high strength, high density, high accuracy, complex-shaped future development, and stainless steel products is more and more, and the ratio that accounts for is increasing.
In metal powder injection molded, the tap density of metal dust is larger, and the content of the binding agent that uses in process of production is lower, and during sintering, change in size is less, performance is better, in process, the intensity of shaping base is large, and whole production technology quality is easy to control.Higher except the tap density requirement of metal dust, other metal dust performance indications, have higher requirement as the aspects such as stability of oxygen content in power, powder size, size distribution and different batches product.
The gentle atomization of tradition water atomization is to prepare the method that powder of stainless steel extensively adopts, but all there are very big-difference in powder of stainless steel quality, performance and the cost etc. of its preparation, be mainly reflected in the following aspects: (1) water atomization pulverization has certain advantage at fineness of powder and cost, but it is irregularly shaped that the gained powder is substantially, greatly affects the development of performance and the metal powder injection molding industry of follow-up stainless steel products.(2) gas-atomized powder has certain advantage at oxygen content in power and powder sphericity, but the powder overall particle size of formulating is partially thick, cost is high, technical difficulty is large, has greatly limited aerosolization powder of stainless steel applying on the metal powder injection molding industry.
Summary of the invention
Problem for above-mentioned existence, the object of the invention is to utilize fineness of powder and the cost advantage of water atomization pulverization, the method of irregular powder of stainless steel by plasma spheroidization that make water fogging, make the minute spherical powder of stainless steel that is applicable to metal powder injection molding.Its technology path is advanced reliable, and process equipment is simple, and continuity is strong, and production cost is low, and good product performance is suitable for suitability for industrialized production.
The invention provides a kind of with low cost, method for preparing the minute spherical stainless steel powder that the nodularization rate is high.
The technical solution adopted for the present invention to solve the technical problems is: the preparation method of minute spherical powder of stainless steel comprises the following steps:
1) set up the argon plasma torch of stable operation;
2) utilize and to carry the gas high-temperature region heating that irregular powder of stainless steel injects argon plasma torch core that makes water fogging;
3) will heat the rear powder of stainless steel particle drop cooling curing that forms and form the spherical stainless steel powder;
4) gas is detached, collect the spherical stainless steel powder;
It is characterized in that: the argon plasma torch of said foundation operation, comprise and set up the argon plasma torch, the pressure of the main working gas argon gas that need this moment is 0.5MPa-0.8MPa, and the pressure of back work gas hydrogen is 0.5MPa-0.8MPa, and the power that loads on induction coil is 20kW-50kW; The pressure of the main working gas argon gas during described argon plasma torch stable operation is 0.5MPa-0.6MPa, and the pressure of back work gas hydrogen is 0.5MPa-0.6MPa, the absolute value 110mm mercury column of system negative pressure-230mm mercury column; The particle size range of the irregular stainless steel powder of water atomization that adds step 2) is 2-30 μ m, the pressure that carries gas is 0.6MPa-0.8MPa, the flow that carries gas is 400-800L/h, and the irregular stainless steel powder feed rate of water atomization is 35g/min-55g/min.
The tap density of the irregular powder of stainless steel of water atomization is 3.5-3.8 g/cm
3, oxygen content 2000-2500ppm.
The tap density of spherical stainless steel powder is 4.7 g/cm
3Above, oxygen content 1800-2100ppm.
Description of drawings
Fig. 1 is the process chart for preparing the minute spherical powder of stainless steel.
Fig. 2 is Electronic Speculum figure before powder of stainless steel 316L nodularization.
Fig. 3 is Electronic Speculum figure after powder of stainless steel 316L nodularization.
The specific embodiment
Below in conjunction with accompanying drawing and enforcement, the present invention is described in further detail, and non-limiting its scope.
A kind of preparation method of minute spherical powder of stainless steel, flow process as shown in Figure 1, carry out in the steps below successively:
1. set up the argon plasma torch of stable operation: to plasma reactor input 0.5MPa, 0.6MPa or 0.8MPa, continue main working gas argon gas stream, back work gas hydrogen input pressure is 0.5MPa, 0.6 MPa or 0.8MPa, induction coil is loaded on certain power, power can be 20 kW, 30 kW or 50 kW, igniter discharge simultaneously, coil inductively coupled and the igniter corona of high-voltage line triggers, and makes argon gas ionization produce the argon plasma torch.Make this moment in whole plasma reactor and keep negative pressure state, can guarantee plasma torch stable operation.
2. utilize nitrogen to make water fogging core high-temperature region heating that irregular powder of stainless steel (former powder) injects the argon plasma torch.Finish with gas powder stream " flying away from " plasma torch heat time heating time, and the duration is only 140 milliseconds ~ 170 milliseconds.Powder of stainless steel is admitted to the core high-temperature region of plasma torch, absorbs a large amount of heats, and particle surface starts fusing, when the 50%(of particle weight at least) while being melted,, due to capillary effect, form the very high minute spherical powder of stainless steel of sphericity.
3. the irregular powder of stainless steel particle of the water atomization after heating and melting drop cooling curing is formed the minute spherical powder of stainless steel.Under radiation, convection current, conduction and four kinds of heating machining functions of chemistry, heated rapidly and melted.When particles fuse is calculated by weight to 50%(at least) time, the particle of melting forms the very high drop of sphericity under capillary effect, and in high thermograde (10
-6K/m) under rapidly cooling, enter the heat-exchanging chamber quenching and solidify, thereby form spherical particle.This nodularization process is suitable as long as technological parameter arranges, and can reach 100% the nodularization rate that is close to.
4. gas is detached, collect the minute spherical powder of stainless steel.After the nodularization process is completed, gas is detached, processes discharging, the nodularization powder enters the collection storage tank, and automatic gauge is collected.
Most important in whole spheronization process is to regulate and arrange the argon plasma parameter.The tiny difference of material powder characteristic, such as the granularity of powder granule is different, its technological parameter has very large difference.Protective gas nitrogen is to escape to the diffusion of plasma torch edge low-temperature space for the constraint powder, so the particle diameter of powder is less, needs to carry larger protective gas nitrogen amount.
Embodiment 1: the average grain diameter of the irregular powder of stainless steel 316L of raw water atomization is 9.8 μ m, and before nodularization, oxygen content in power is 2300ppm, and the powder tap density is 3.53g/cm
3, in the nodularization process, the input power of argon plasma is 30kW, the system negative pressure keeps the 130mm mercury column.Plasma master working gas argon gas and assist gas Hydrogen Vapor Pressure are 0.5MPa.The pressure that carries gas nitrogen is 0.6MPa, the flow that carries gas is 600L/h, and the irregular stainless steel powder feed rate of water atomization is 40g/min, and after nodularization, the average grain diameter of powder is 10.3 μ m, oxygen content in power is 2230ppm, and the powder tap density is 4.76 g/cm
3
Embodiment 2: the average grain diameter of the irregular powder of stainless steel 316L of raw water atomization is 11 μ m, and before nodularization, oxygen content in power is 2450ppm, and the powder tap density is 3.68 g/cm
3, in the nodularization process, the input power of argon plasma is 35kW, the system negative pressure keeps the 180mm mercury column.Plasma master working gas argon gas and assist gas Hydrogen Vapor Pressure are 0.6MPa.The pressure that carries gas nitrogen is 0.75MPa, the flow that carries gas is 700L/h, and the irregular stainless steel powder feed rate of water atomization is 35g/min, and after nodularization, the average grain diameter of powder is 11.6 μ m, oxygen content in power is 2430ppm, and the powder tap density is 4.83 g/cm
3
Above demonstration and described basic principle of the present invention and principal character and advantage of the present invention.The technology of the industry should be understood; the present invention is not subjected to the present of above-described embodiment; that describes in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (3)
1. the preparation method of a minute spherical powder of stainless steel is characterized in that the method comprises the following steps:
1) set up the argon plasma torch of stable operation;
2) utilize and to carry the gas high-temperature region heating that irregular powder of stainless steel injects argon plasma torch core that makes water fogging;
3) will heat the rear powder of stainless steel particle drop cooling curing that forms and form the spherical stainless steel powder;
4) gas is detached, collect the spherical stainless steel powder;
The argon plasma torch of described foundation operation, comprise and set up the argon plasma torch, the pressure of the main working gas argon gas that need this moment is 0.5MPa-0.8MPa, and the pressure of back work gas hydrogen is 0.5MPa-0.8MPa, and the power that loads on induction coil is 20kW-50kW; The pressure of the main working gas argon gas during described argon plasma torch stable operation is 0.5MPa-0.6MPa, and the pressure of back work gas hydrogen is 0.5MPa-0.6MPa, the absolute value 110mm mercury column of system negative pressure-230mm mercury column; The particle size range of the irregular stainless steel powder of water atomization that adds step 2) is 2-30 μ m, the pressure that carries gas is 0.6MPa-0.8MPa, the flow that carries gas is 400-800L/h, and the irregular stainless steel powder feed rate of water atomization is 35g/min-55g/min.
2. the preparation method of a kind of minute spherical powder of stainless steel according to claim 1, it is characterized in that: the tap density of the irregular powder of stainless steel of water atomization is 3.5-3.8 g/cm
3, oxygen content 2000-2500ppm.
3. the preparation method of a kind of minute spherical powder of stainless steel according to claim 1, it is characterized in that: the tap density of spherical stainless steel powder is 4.7 g/cm
3Above, oxygen content 1800-2100ppm.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104227006A (en) * | 2014-08-26 | 2014-12-24 | 苏州智研新材料科技有限公司 | Method for preparing fine spherical stainless steel powder |
| CN105522161A (en) * | 2015-12-25 | 2016-04-27 | 中国科学院重庆绿色智能技术研究院 | Rapid large-scale preparing method for small-grain-size spherical powder for 3D printing |
| CN106141169A (en) * | 2016-08-16 | 2016-11-23 | 盐城市科瑞达科技咨询服务有限公司 | A kind of metal powder material for 3D printing and preparation method thereof |
| CN106319373A (en) * | 2016-08-16 | 2017-01-11 | 盐城市科瑞达科技咨询服务有限公司 | Micro spherical ferritic stainless steel powder and preparation method thereof |
| CN106735268A (en) * | 2016-12-16 | 2017-05-31 | 南通金源智能技术有限公司 | Preparation method for reducing the 3D printing metal powder material of hollow powder |
| CN107199345A (en) * | 2017-05-22 | 2017-09-26 | 加拿大艾浦莱斯有限公司 | A kind of high-purity superfine spherical titanium powder, preparation method thereof and its device |
| WO2018121688A1 (en) * | 2016-12-29 | 2018-07-05 | 江民德 | 3d printing spherical powder preparation method utilizing plasma |
| CN108421984A (en) * | 2018-03-16 | 2018-08-21 | 广东正德材料表面科技有限公司 | Stainless steel powder for additive manufacturing and preparation method thereof |
| CN110405218A (en) * | 2018-04-26 | 2019-11-05 | 广东正德材料表面科技有限公司 | High-sphericity nano-structure stainless steel powder and preparation method thereof |
| CN110893468A (en) * | 2019-12-26 | 2020-03-20 | 安徽工业大学 | Method and device for preparing spherical metal powder by combined atomization |
| CN112935263A (en) * | 2021-02-07 | 2021-06-11 | 广东正德材料表面科技有限公司 | Spherical nanocrystalline stainless steel powder and preparation method thereof |
| CN114570924A (en) * | 2022-04-29 | 2022-06-03 | 矿冶科技集团有限公司 | Binder, 5-15 micron tungsten carbide powder and preparation method thereof |
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| CN102672189A (en) * | 2012-05-17 | 2012-09-19 | 赣州海盛钨钼集团有限公司 | Preparation method of spherical tungsten powder |
| CN102674353A (en) * | 2012-05-17 | 2012-09-19 | 赣州海盛钨钼集团有限公司 | Method for preparing spherical wolfram carbide powder |
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| JPH05156321A (en) * | 1991-12-05 | 1993-06-22 | Mitsubishi Steel Mfg Co Ltd | Water-atomized globular metal powder and production thereof |
| CN101391307A (en) * | 2008-11-20 | 2009-03-25 | 核工业西南物理研究院 | A method for preparing fine spherical tungsten powder |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104227006A (en) * | 2014-08-26 | 2014-12-24 | 苏州智研新材料科技有限公司 | Method for preparing fine spherical stainless steel powder |
| CN105522161A (en) * | 2015-12-25 | 2016-04-27 | 中国科学院重庆绿色智能技术研究院 | Rapid large-scale preparing method for small-grain-size spherical powder for 3D printing |
| CN105522161B (en) * | 2015-12-25 | 2021-08-10 | 中国科学院重庆绿色智能技术研究院 | Rapid large-scale preparation method of fine-particle-size spherical powder for 3D printing |
| CN106141169B (en) * | 2016-08-16 | 2018-07-20 | 盐城市科瑞达科技咨询服务有限公司 | A kind of metal powder material and preparation method thereof for 3D printing |
| CN106141169A (en) * | 2016-08-16 | 2016-11-23 | 盐城市科瑞达科技咨询服务有限公司 | A kind of metal powder material for 3D printing and preparation method thereof |
| CN106319373A (en) * | 2016-08-16 | 2017-01-11 | 盐城市科瑞达科技咨询服务有限公司 | Micro spherical ferritic stainless steel powder and preparation method thereof |
| CN108531824A (en) * | 2016-08-16 | 2018-09-14 | 刘可 | A kind of application of minute spherical ferritic stainless steel powder |
| CN106319373B (en) * | 2016-08-16 | 2018-07-17 | 盐城市科瑞达科技咨询服务有限公司 | A kind of minute spherical ferritic stainless steel powder and preparation method thereof |
| CN106735268A (en) * | 2016-12-16 | 2017-05-31 | 南通金源智能技术有限公司 | Preparation method for reducing the 3D printing metal powder material of hollow powder |
| WO2018121688A1 (en) * | 2016-12-29 | 2018-07-05 | 江民德 | 3d printing spherical powder preparation method utilizing plasma |
| CN107199345B (en) * | 2017-05-22 | 2019-09-13 | 加拿大艾浦莱斯有限公司 | A kind of high-purity superfine spherical titanium powder, preparation method thereof and its device |
| CN107199345A (en) * | 2017-05-22 | 2017-09-26 | 加拿大艾浦莱斯有限公司 | A kind of high-purity superfine spherical titanium powder, preparation method thereof and its device |
| CN108421984A (en) * | 2018-03-16 | 2018-08-21 | 广东正德材料表面科技有限公司 | Stainless steel powder for additive manufacturing and preparation method thereof |
| CN110405218A (en) * | 2018-04-26 | 2019-11-05 | 广东正德材料表面科技有限公司 | High-sphericity nano-structure stainless steel powder and preparation method thereof |
| CN110893468A (en) * | 2019-12-26 | 2020-03-20 | 安徽工业大学 | Method and device for preparing spherical metal powder by combined atomization |
| CN112935263A (en) * | 2021-02-07 | 2021-06-11 | 广东正德材料表面科技有限公司 | Spherical nanocrystalline stainless steel powder and preparation method thereof |
| CN114570924A (en) * | 2022-04-29 | 2022-06-03 | 矿冶科技集团有限公司 | Binder, 5-15 micron tungsten carbide powder and preparation method thereof |
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Application publication date: 20131113 |