WO2010106716A1 - 粉体の分級方法 - Google Patents
粉体の分級方法 Download PDFInfo
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- WO2010106716A1 WO2010106716A1 PCT/JP2009/071140 JP2009071140W WO2010106716A1 WO 2010106716 A1 WO2010106716 A1 WO 2010106716A1 JP 2009071140 W JP2009071140 W JP 2009071140W WO 2010106716 A1 WO2010106716 A1 WO 2010106716A1
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- powder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/086—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by the winding course of the gas stream
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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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
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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
Definitions
- the present invention relates to a powder classification method for effectively classifying a powder having a particle size distribution at a desired classification point (particle size).
- a classification method is known in which a fluid auxiliary such as alcohol is added in advance when powder such as glassy blast furnace slag is classified into fine powder and coarse powder (for example, see Patent Document 1).
- a fluid auxiliary such as alcohol
- the particles are adsorbed and aggregated to form aggregated particles having a large particle size. It is prevented from being formed and the classification efficiency is prevented from being lowered.
- an extremely small nickel fine powder having an average particle size of 1 ⁇ m or less is used as an internal electrode of a multilayer ceramic capacitor.
- the average particle diameter is extremely small but also the width of the particle size distribution is extremely narrow, that is, a more uniform fine powder is required.
- the raw material powder adheres to each part in the classifier and the raw material inlet and the high-pressure gas outlet are blocked, resulting in deterioration of the classification performance and long operation time. It was difficult.
- An object of the present invention is to provide a powder classification method capable of classifying powder with high accuracy.
- the powder classification method of the present invention is a powder classification method using a fluid classifier, wherein a mixing step of mixing a powder made of nickel and an auxiliary agent made of an organic solvent having a flash point of 80 ° C. or higher; A charging step of charging the powder mixed in the mixing step into the fluid classifier, a heating step of heating a gas, and a supplying step of supplying the gas heated in the heating step to the fluid classifier And the fluid classifier includes a classification step of classifying the powder based on a particle size.
- the powder classification method of the present invention is a powder classification method using a fluid classifier, wherein a mixing step of mixing a powder made of nickel and an auxiliary agent made of water is mixed in the mixing step.
- the heating step of heating the gas In the charging step of charging the powder into the fluid classifier, the heating step of heating the gas, the supplying step of supplying the gas heated in the heating step to the fluid classifier, and the fluid classifier And a classification step of classifying the powder based on particle size.
- the powder classification method of the present invention it is possible to classify the powder with high accuracy using water or an organic solvent having a high flash point as an auxiliary agent.
- FIG. 1 is a schematic configuration diagram showing the configuration of a fluid classifier used by the powder classification method according to this embodiment.
- the classifier 2 includes a classifier (fluid classifier) 4 that classifies powders that are input as a raw material by a swirling airflow generated inside, and a feeder 6 that inputs the powders to the classifier 4.
- a blower 8 that supplies high-pressure gas to the classifier 4 and a first heater 10 that heats the supplied high-pressure gas to a predetermined temperature are provided.
- the classifier 2 also includes an intake blower 12 that sucks and collects fine powder separated to a desired classification point or less together with the gas in the classifier 4, and the air sucked by the negative pressure generated in the classifier 4. It has the 2nd heater 14 which heats (normal-pressure gas), and the collection
- the classifier 4 having a substantially conical shape is installed so that the apex of the cone faces downward, and a centrifuge chamber 20 (see FIG. 2), which will be described in detail later, is formed in the upper part of the classifier 4. ing.
- a centrifuge chamber 20 see FIG. 2
- the atmospheric air as the atmospheric gas existing outside the classifier 4 and the high-pressure gas from the blower 8 are supplied, and the powder to be classified is fed from the feeder 6. .
- the feeder 6 has a screw (not shown) inside, and by rotating the screw, the powder contained inside can be quantitatively sent out.
- the delivered powder is introduced into the classifier 4 from an inlet 26 (see FIG. 2) provided on the upper surface of the classifier 4.
- the powder accommodated in the feeder 6 is previously mixed with the adjuvant mentioned later for details.
- the blower 8 compresses the atmosphere to generate high-pressure gas, and supplies the high-pressure gas into the classifier 4 through the first heater 10.
- the first heater 10 has a pipe through which high-pressure gas passes, and heating means made of a filament, an erotic fin, or the like is installed in the pipe.
- the heating means heats the high-pressure gas passing through the pipe to a predetermined temperature and removes moisture contained in the high-pressure gas.
- another dehydrating means for removing moisture contained in the high-pressure gas may be separately provided between the blower 8 and the classifier 4, or a filter for removing dust or the like may be appropriately provided.
- the suction blower 12 collects the fine powder separated by the classifier 4 by sucking together with the gas present in the classifier 4 from a suction port 32 (see FIG. 2) provided at the center of the upper surface of the classifier 4. .
- a filter such as a bag filter may be appropriately provided between the suction port 32 and the suction blower 12.
- the classification device 2 since the classification device 2 according to this embodiment includes the second heater 14 that heats the sucked normal pressure gas, the temperature of the swirling airflow in the centrifugal separation chamber 20 is heated to a predetermined temperature. be able to. Similar to the first heater 10, the second heater 14 has a pipe through which atmospheric gas passes, and heating means such as a filament and an erotic fin is installed in the pipe.
- the collection container 16 is installed at the lowermost part of the classifier 4 and collects the coarse powder that has fallen along the slope of the conical portion of the classifier 4 after being centrifuged in the centrifuge chamber 20.
- FIG. 2 is a longitudinal sectional view of a plane including the central axis of the classifier 4
- FIG. 3 is a transverse sectional view at the position of the centrifuge chamber 20 by a plane perpendicular to the central axis.
- an inlet 26 and an ejection nozzle 30 that are not originally shown in FIG. They are indicated by virtual lines and dotted lines, respectively. Further, only two ejection nozzles 30 are shown for explanation.
- an upper disk-shaped member 22 having a flat disk shape and a lower disk-shaped member 24 having a hollow disk shape are maintained at a predetermined interval in the upper part of the classifier 4.
- the cylindrical centrifuge chamber 20 is formed between the two disk-shaped members.
- an input port 26 through which the powder input from the above-described feeder 6 passes is formed above the centrifugal separation chamber 20, an input port 26 through which the powder input from the above-described feeder 6 passes is formed.
- a plurality of guide vanes 40 are arranged at equal intervals on the outer periphery of the centrifuge chamber 20, and below the centrifuge chamber 20, on the outer peripheral wall of the lower disk-shaped member 24.
- a reclassification zone 28 is formed along which the powder that has been centrifuged and then descended from the centrifuge chamber 20 is again sprayed into the centrifuge chamber 20.
- an ejection nozzle 30 that ejects the high-pressure gas supplied from the blower 8 is arranged so that the ejection direction is substantially the same as the tangential direction of the outer peripheral wall.
- the ejection nozzle 30 ejects a high-pressure gas to disperse the powder introduced from the insertion port 26 and supplies the gas into the centrifuge chamber 20 as an auxiliary. Further, fine powder existing in the reclassification zone 28 is sprayed back into the centrifugal separation chamber 20.
- six ejection nozzles 30 are arranged on the outer peripheral wall of the reclassification zone 28. However, this is an example, and the arrangement position and number of the ejection nozzles 30 have a degree of freedom. is there.
- an inlet 32 for sucking and collecting fine powder separated from coarse powder by centrifugation.
- the centrifugally separated coarse powder descends from the reclassification zone 28 on the slope of the conical portion of the classifier 4 and is discharged from the discharge port 34 provided at the lowermost part of the classifier 4 to be collected in the above-described collection container 16. Housed inside.
- a guide vane 40 that can form a swirling airflow in the centrifuge chamber 20 and adjust the swirling speed of the swirling airflow is disposed on the outer periphery of the centrifuge chamber 20. Yes.
- 16 guide vanes 40 are arranged.
- the guide vane 40 is pivotally supported between the upper disk-shaped member 22 and the lower disk-shaped member 24 by a rotating shaft 40a, and is not illustrated by a pin 40b.
- the guide vanes 40 can be simultaneously rotated by a predetermined angle by rotating the rotating plate.
- the flow rate of the atmospheric gas passing through the interval in the direction of the white arrow shown in FIG. As a result, the flow velocity of the swirling airflow in the centrifugal separation chamber 20 can be changed.
- the classification performance (specifically, the classification point) of the classifier 4 according to this embodiment can be changed.
- the normal pressure gas that passes through the gaps between the guide vanes 40 is a normal pressure gas that has been heated to a predetermined temperature by the second heater 14 in advance.
- the powder to be classified and the liquid auxiliary are mixed (step S10).
- the type of the auxiliary agent to be used may be appropriately selected according to the type of powder to be classified, but the classification target is nickel powder as in the powder classification method according to this embodiment.
- an organic solvent having a flash point of 80 ° C. or higher, such as diethylene glycol (flash point 124 ° C.) as an example of water or glycols as an auxiliary agent.
- the additive addition amount and the mixing method may be appropriately selected according to the type of powder.
- a predetermined amount is added to the powder to be classified.
- mixing is performed using a mixer.
- a part of the auxiliary agent added to the powder evaporates during and after mixing with the powder. Therefore, the auxiliary powder is included in the mixed powder when the mixed powder is put into the feeder 6 of the classifier 2
- the amount of auxiliary added is less than the amount of auxiliary added at the start of mixing.
- HI-X (Nisshin Engineering Co., Ltd.) is used for the mixer.
- the suction of the gas is started by the suction blower 12 (step S12). Since the gas in the centrifuge chamber 20 is sucked from the suction port 32 provided in the upper center of the centrifuge chamber 20, the air pressure at the center of the centrifuge chamber 20 becomes relatively low. Due to the negative pressure generated in the centrifuge chamber 20 in this way, atmospheric air, which is a normal pressure gas, is sucked from between the guide vanes 40 arranged along the outer periphery of the centrifuge chamber 20. (Step S16). Note that the normal pressure gas sucked into the centrifugal separation chamber 20 is heated in advance to a predetermined temperature by passing through a pipe provided in the second heater 14 (step S14).
- the normal pressure gas is sucked from between the guide vanes 40, thereby forming a swirling airflow having a flow velocity determined according to the rotation angle of the guide vanes 40.
- the normal pressure gas to be sucked is heated so that the temperature of the swirling airflow in the centrifugal separation chamber 20 is about 110 ° C.
- step S18 supply of high-pressure gas to the inside of the centrifugal separation chamber 20 of the classifier 4 is started using the blower 8.
- the high-pressure gas injected from the blower 8 is heated to a predetermined temperature by the first heater 10 (step S18).
- the first heater 10 heats the high-pressure gas so that the temperature of the swirling airflow in the centrifugal separation chamber 20 is about 110 ° C., similarly to the second heater 14.
- the high-pressure gas heated to a predetermined temperature is ejected from a plurality of ejection nozzles 30 provided on the outer peripheral wall of the centrifugal separation chamber 20, and is supplied into the centrifugal separation chamber 20 (step S20).
- the mixed powder sent quantitatively from the feeder 6 is charged.
- the centrifuge chamber 20 is charged through the mouth 26 (step S22).
- the mixed powder introduced from the inlet 26 moves around the outer periphery of the centrifuge chamber 20 at high speed. It collides with a swirling swirling airflow and is dispersed rapidly. At this time, dispersion of the powder is promoted by rapid vaporization of the auxiliary agent mixed between the fine particles of the powder.
- the powder dispersed in units of fine particles in this way is swirled several times in the centrifuge chamber 20 without adhering to the surfaces of the upper disc-like member 22 and the lower disc-like member 24 constituting the centrifuge chamber 20. Then, classification is performed based on the particle size of the powder (step S24).
- fine powder having a particle size equal to or smaller than a desired classification point is collected in the central portion of the centrifugal separation chamber 20, and the respective centers of the upper disk-shaped member 22 and the lower disk-shaped member 24.
- the gas is sucked from the suction port 32 together with the gas sucked by the suction blower 12 (step S26).
- the coarse powder having a particle size exceeding the classification point is concentrated on the outer periphery of the centrifugal separation chamber 20 by the centrifugal action in the centrifugal separation chamber 20 and then descends from the reclassification zone 28 to the conical portion of the classifier 4. Then, it is discharged from the discharge port 34 and accommodated in the collection container 16.
- the high-temperature swirling airflow swirling in the centrifuge chamber 20 and the powder effectively dispersed by the effect of the auxiliary agent are centrifuged without adhering to the surfaces of the components constituting the centrifuge chamber 20. It turns in the separation chamber 20 and is efficiently classified into fine powder below the desired classification point and the remaining coarse powder. In addition, since all the added adjuvants are vaporized, they are not contained in the recovered powder.
- the gas supplied is heated so that the whirling airflow in the classifier 4 is about 110 ° C., but the temperature of the whirling air in the classifier 4 is limited to about 110 ° C.
- the temperature may be any temperature at which the auxiliary agent is vaporized in the centrifuge chamber 20.
- water or glycols are used as auxiliary agents, but ketones may be used as auxiliary agents.
- FIG. 5 is a flowchart for explaining a powder classification method according to the second embodiment.
- the powder to be classified and the auxiliary are mixed while heating (step S30).
- the type of the auxiliary agent to be used may be appropriately selected according to the type of powder to be classified, but the classification target is nickel powder as in the powder classification method according to this embodiment.
- an organic solvent having a flash point of 80 ° C. or higher such as water or glycols such as diethylene glycol (flash point 124 ° C.) as an auxiliary agent.
- heating is performed to about 75 ° C., but the heating temperature may be appropriately selected depending on the combination of the powder and the auxiliary agent.
- steps S32 to S40 are performed. Since these processes are the same as the processes shown in steps S12 to S20 of the flowchart of FIG. 4, description thereof will be omitted.
- the mixed powder sent quantitatively from the feeder 6 is thrown into the centrifuge chamber 20 from the inlet 26 (step S42). At this time, since it is heated in step S30, the mixed powder is put into the centrifuge chamber 20 at a predetermined temperature.
- the processes shown in steps S44 and S46 are performed. Since these processes are the same as the processes shown in steps S24 and S26 of the flowchart of FIG.
- the normal pressure gas sucked so that the temperature of the swirling airflow becomes about 110 ° C. in step S34 is heated by the second heater 14, and the step is performed.
- the high-pressure gas is heated by the first heater 10 so that the temperature of the swirling airflow is about 110 ° C.
- the powder classification method according to the present embodiment will be described more specifically using examples.
- the amount of gas sucked by the suction blower 12 shown in FIG. 1 is 0.5 m 3 / min, and the pressure of the high-pressure gas generated by the blower 8 is 0.5 MPa.
- the powder to be classified is a powder composed of a fine powder of nickel (medium diameter 0.73 ⁇ m, ratio of 19.5 ⁇ m or less, 79.5 vol%, maximum particle diameter 3.3 ⁇ m).
- a powder obtained by adding water or an organic solvent as an auxiliary agent to a fine nickel powder and mixing it is used.
- the input of the powder to the classifier was set to 500 g / hour.
- the temperature in the classifier is set to 110 ° C. Note that the temperature in the classifier is obtained by measuring the temperature of the gas immediately after being sucked from the suction port in the classifier by the suction blower of the classifier.
- the auxiliary agent added to the powder as described above partially evaporates during and after mixing with the powder. Therefore, in the present embodiment, the amount of the auxiliary added when mixing with the powder is “addition amount”, and the auxiliary contained in the mixed powder when the mixed powder is put into the feeder 6 of the classifier 2. Is expressed as “adsorption amount”.
- Example 1 In Example 1, water was used as an auxiliary agent, and water was added in an amount of 3% to 5% with respect to the nickel powder. Moreover, mixing of nickel powder and water was performed at 20 ° C. and 75 ° C. Table 2 shows the relationship between the amount of added water (mass ratio) in the mixed powder, product yield, and product quality. The product quality is data on nickel collected from the suction port 32 shown in step S26 of the flowchart of FIG. 4 and step S46 of the flowchart of FIG. In addition, as a comparative example, an experiment was also performed on a sample that was not subjected to pretreatment for adding an auxiliary agent to nickel powder.
- the product yield of nickel can be increased by using water as an auxiliary agent, and the product quality can be further improved by mixing the nickel powder and water while heating.
- Example 2 diethylene glycol was used as an example of an organic solvent having a flash point of 80 ° C. or more as an auxiliary agent, and diethylene glycol was added in a mass ratio of 4% to 5% with respect to the nickel powder. Moreover, mixing of nickel powder and diethylene glycol was performed at 20 ° C and 75 ° C. Table 2 shows the relationship between the addition amount (mass ratio) of diethylene glycol in the mixed powder, product yield, and product quality. The product quality is data on nickel collected from the suction port 32 shown in step S26 of the flowchart of FIG. 4 and step S46 of the flowchart of FIG. Moreover, the comparative example about what does not pre-process like Example 1 is also shown.
- the product yield of nickel can be increased by using diethylene glycol as an auxiliary agent, and the product quality can be further improved by mixing the nickel powder and water while heating.
- the powder made of nickel which is a classification target
- water or an auxiliary agent made of an organic solvent having a flash point of 80 ° C. or higher After mixing, the mixture is put into the centrifuge chamber in the fluid classifier and a high-speed high-speed swirling air flow is formed in the centrifuge chamber by the heated gas, so that the powder having a particle size of 1 ⁇ m or less is efficiently classified. Can do.
- the powder made of nickel to be classified is mixed with water or an auxiliary agent made of an organic solvent having a flash point of 80 ° C. or higher while heating, the viscosity of the auxiliary agent is lowered by heating, and the powder and The auxiliary agent is uniformly dispersed, and the product quality is further improved.
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- Combined Means For Separation Of Solids (AREA)
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- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
Description
実施例1においては、助剤として水を用い、水をニッケル粉体に対して質量比で3%~5%添加した。また、ニッケル粉体と水との混合を20℃及び75℃で行った。表2に混合粉体における水の添加量(質量比)と製品収率、製品品質との関係を示す。なお、製品品質は、図4のフローチャートのステップS26及び図5のフローチャートのステップS46に示す吸入口32から回収されたニッケルについてのデータである。また、比較例として助剤をニッケル粉体に対して添加する前処理を行わないものについても実験を行った。
実施例2においては、助剤として引火点が80℃以上である有機溶媒の例としてジエチレングリコールを用い、ジエチレングリコールをニッケル粉体に対して質量比で4%~5%添加した。また、ニッケル粉体とジエチレングリコールとの混合を20℃及び75℃で行った。表2に混合粉体におけるジエチレングリコールの添加量(質量比)と製品収率、製品品質との関係を示す。なお、製品品質は、図4のフローチャートのステップS26及び図5のフローチャートのステップS46に示す吸入口32から回収されたニッケルについてのデータである。また、実施例1と同様に前処理を行わないものについての比較例も示す。
Claims (5)
- 流体分級機を用いた粉体の分級方法において、
ニッケルからなる粉体と引火点が80℃以上である有機溶媒からなる助剤とを混合する混合工程と、
前記混合工程において混合された前記粉体を前記流体分級機に投入する投入工程と、
気体を加熱する加熱工程と、
前記加熱工程において加熱された前記気体を前記流体分級機に供給する供給工程と、
前記流体分級機において、前記粉体を粒径に基づいて分級する分級工程と
を含むことを特徴とする粉体の分級方法。 - 前記助剤はグリコール類であることを特徴とする請求項1記載の粉体の分級方法。
- 前記助剤はケトン類であることを特徴とする請求項1記載の粉体の分級方法。
- 流体分級機を用いた粉体の分級方法において、
ニッケルからなる粉体と水からなる助剤とを混合する混合工程と、
前記混合工程において混合された前記粉体を前記流体分級機に投入する投入工程と、
気体を加熱する加熱工程と、
前記加熱工程において加熱された前記気体を前記流体分級機に供給する供給工程と、
前記流体分級機において、前記粉体を粒径に基づいて分級する分級工程とを含むことを特徴とする粉体の分級方法。 - 前記混合工程において前記ニッケルからなる粉体と前記助剤とを加熱しながら混合することを特徴とする請求項1乃至4の何れか一項に記載の粉体の分級方法。
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Cited By (5)
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JP2015073938A (ja) * | 2013-10-08 | 2015-04-20 | 株式会社日清製粉グループ本社 | 旋回渦流式分級機および分級方法 |
JPWO2016114234A1 (ja) * | 2015-01-16 | 2017-10-19 | 株式会社日清製粉グループ本社 | 粉体分級装置 |
CN111918724A (zh) * | 2018-03-29 | 2020-11-10 | 东邦钛株式会社 | 金属粉体的制造方法 |
WO2021210557A1 (ja) * | 2020-04-14 | 2021-10-21 | 昭栄化学工業株式会社 | 無機微粉末の製造方法 |
KR20230014073A (ko) | 2021-07-20 | 2023-01-27 | 소에이 가가쿠 고교 가부시키가이샤 | 금속 미분말 제조방법 및 금속 분말 |
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KR101838769B1 (ko) | 2011-02-28 | 2018-03-14 | 닛신 엔지니어링 가부시키가이샤 | 분체의 분쇄 방법 |
CN103691931B (zh) * | 2013-12-16 | 2015-12-02 | 宁波广博纳米新材料股份有限公司 | 水分级处理金属镍粉的抗氧化方法 |
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JP2015073938A (ja) * | 2013-10-08 | 2015-04-20 | 株式会社日清製粉グループ本社 | 旋回渦流式分級機および分級方法 |
JPWO2016114234A1 (ja) * | 2015-01-16 | 2017-10-19 | 株式会社日清製粉グループ本社 | 粉体分級装置 |
CN111918724A (zh) * | 2018-03-29 | 2020-11-10 | 东邦钛株式会社 | 金属粉体的制造方法 |
WO2021210557A1 (ja) * | 2020-04-14 | 2021-10-21 | 昭栄化学工業株式会社 | 無機微粉末の製造方法 |
KR20230002437A (ko) | 2020-04-14 | 2023-01-05 | 소에이 가가쿠 고교 가부시키가이샤 | 카르복실산 함유 니켈 분말 및 카르복실산 함유 니켈 분말의 제조방법 |
KR20230008044A (ko) | 2020-04-14 | 2023-01-13 | 소에이 가가쿠 고교 가부시키가이샤 | 무기 미분말 제조방법 |
KR20230014073A (ko) | 2021-07-20 | 2023-01-27 | 소에이 가가쿠 고교 가부시키가이샤 | 금속 미분말 제조방법 및 금속 분말 |
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JP5323174B2 (ja) | 2013-10-23 |
KR20110135856A (ko) | 2011-12-19 |
CN102325604B (zh) | 2013-12-25 |
KR101609408B1 (ko) | 2016-04-05 |
TWI471179B (zh) | 2015-02-01 |
CN102325604A (zh) | 2012-01-18 |
TW201036714A (en) | 2010-10-16 |
JPWO2010106716A1 (ja) | 2012-09-20 |
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