CN115213419A - Silver powder manufacturing method - Google Patents
Silver powder manufacturing method Download PDFInfo
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- CN115213419A CN115213419A CN202210816288.4A CN202210816288A CN115213419A CN 115213419 A CN115213419 A CN 115213419A CN 202210816288 A CN202210816288 A CN 202210816288A CN 115213419 A CN115213419 A CN 115213419A
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- temperature
- atomizing
- chamber
- silver powder
- silver
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 238000000889 atomisation Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 41
- 229910052709 silver Inorganic materials 0.000 claims abstract description 35
- 239000004332 silver Substances 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 239000011261 inert gas Substances 0.000 claims abstract description 16
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- 239000000758 substrate Substances 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 24
- 238000004321 preservation Methods 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000010926 purge Methods 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 20
- 239000002245 particle Substances 0.000 abstract description 13
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 description 13
- 239000002184 metal Substances 0.000 description 13
- 238000009529 body temperature measurement Methods 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 238000000465 moulding Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009689 gas atomisation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000012798 spherical particle Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- B22F1/06—Metallic powder characterised by the shape of the particles
- B22F1/065—Spherical particles
-
- 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
- B22F2009/0844—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 in controlled atmosphere
-
- 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
- B22F2009/086—Cooling after atomisation
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Nanotechnology (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
The invention provides a silver powder manufacturing method, which comprises the following steps: s1, putting a pure silver substrate into a smelting furnace for heating and melting to obtain silver melt; s2, preheating the atomization chamber, and detecting the temperature in the atomization chamber in real time to enable the temperature in the atomization chamber to reach a preset temperature; s3, controlling the silver melt to be poured into the tundish and uniformly flowing out of the atomization chamber; s4, introducing high-pressure inert gas, spraying the inert gas from an atomizing nozzle, and atomizing the dropped silver melt; and S5, cooling and collecting powder after atomization is finished. In the process of the silver powder manufacturing method, the environmental temperature in the atomizing chamber is increased in advance, so that the cooling time of the liquid drops is prolonged, the spheroidizing time of the liquid drops is further prolonged, the silver powder particles obtained after final cooling have better sphericity (roundness), and the product quality of the silver powder particles is improved.
Description
Technical Field
The invention relates to the technical field of metal powder manufacturing, in particular to a silver powder manufacturing method.
Background
The silver ornament is a popular traditional ornament for people in the southwest region of China, and as time progresses, the process of the silver ornament introduces more advanced manufacturing processes on the basis of the traditional process, wherein one of the manufacturing processes is a metal powder forming method.
At present, a metal powder molding method is mainly applied to the field of machine manufacturing, and therefore, an alloy powder material is used as a raw material for metal powder molding in the field of machine manufacturing in general. The alloy powder is obtained by atomizing an alloy melt, for example, in the gas atomization method, in the process of dropping the alloy melt from a crucible, impact atomization is carried out on dropped alloy droplets through inert gas, and the atomized small-particle droplets are cooled in the dropping process and are spheroidized to form the alloy powder with round particles.
Because the metal powder molding has the advantage of being capable of rapidly molding complex structures and realizing the advantage of complex structures which cannot be achieved by some traditional processes, the process of the silver ornament also starts to introduce the metal powder molding method. However, after the introduction of the existing metal powder forming method, which may be based on the difference of material properties, the roundness of the particles in the metal powder manufacturing process by pure silver does not always reach the required standard, and the aluminum or other alloys do not have the problem.
Therefore, when the metal powder forming method applied to the field of machine manufacturing is applied to forming of the silver ornaments, certain problems still exist in the silver metal powder manufacturing process, and the raw material standard required by forming cannot be met.
Disclosure of Invention
The invention aims to provide a silver powder manufacturing method for improving the roundness of silver powder particles.
In order to solve the above technical problems, the present invention provides a method for manufacturing silver powder, comprising the steps of:
s1, putting a pure silver substrate into a smelting furnace for heating and melting to obtain silver melt;
s2, preheating the atomization chamber, and detecting the temperature in the atomization chamber in real time to enable the temperature in the atomization chamber to reach a preset temperature;
s3, controlling the silver melt to be poured into the tundish and uniformly flowing out of the atomizing chamber;
s4, introducing high-pressure inert gas, spraying the inert gas from an atomizing nozzle, and atomizing the dropped silver melt;
and S5, cooling and collecting powder after atomization is finished.
Preferably, the process of step S2 includes:
s21, introducing heat preservation gas with the temperature higher than the preset temperature into the atomizing chamber;
and S22, detecting the temperature in the atomizing chamber in real time until the preset temperature is reached.
Preferably, in the step S21, the temperature of the inert gas is the same as or similar to the temperature of the heat preservation gas introduced into the atomization chamber.
Preferably, the insulating gas is also an inert gas.
Preferably, in the step S21, the heat preservation gas is introduced into the atomization chamber
Preferably, the process of step S2 includes:
s21a, heating the wall surface of the atomizing chamber;
s22a, detecting the temperature inside the atomizing chamber in real time until the preset temperature is reached;
and S23a, continuously heating the wall surface of the atomizing chamber and keeping the temperature in the atomizing chamber.
Preferably, in the step S21a, when the wall surface of the atomization chamber is heated, air in the atomization chamber is circulated.
Preferably, the step S4 further includes:
s41, monitoring the temperature in the atomization chamber in real time in the atomization process, and if the real-time temperature is not in a preset range, regulating and controlling the temperature in the atomization chamber to keep the temperature in the preset range.
Preferably, before the cooling, the step S5 further includes:
and S50, reducing the pressure of the atomizing gas, and stopping introducing the atomizing gas after continuously purging for a period of time.
Preferably, in the step S3, the remaining silver melt in the tundish is less than 2cm deep.
Preferably, the process of step S2 further includes:
and S23, continuously introducing heat preservation gas to keep the temperature in the atomization chamber at a preset temperature.
Compared with the prior art, in the process of the silver powder manufacturing method, the cooling time of the liquid drops is prolonged by pre-increasing the environmental temperature in the atomizing chamber, so that the spheroidization time of the liquid drops is longer, the silver powder particles obtained after final cooling have better sphericity (roundness), and the product quality of the silver powder particles is improved.
Drawings
FIG. 1 is a schematic flow chart of a silver powder manufacturing method provided by the present invention.
Detailed Description
The following examples, which are given in conjunction with the drawings, further illustrate the embodiments of the silver powder production method of the present invention.
The embodiment of the invention provides a silver powder manufacturing method, which uses pure silver as a base material, obtains the silver powder with spherical particles through heating and atomization, and can be used in the forming process of pure silver commodities such as silver ornaments and artworks, in particular to the process of forming the silver powder by laser sintering.
Fig. 1 is a flow chart of a silver powder manufacturing method according to an embodiment of the present invention, the method including the steps of:
s1, putting the pure silver substrate into a smelting furnace for heating and melting to obtain silver melt.
Specifically, in the step, the silver substrate is firstly cut into the size meeting the requirement according to the size requirement, and then is added into a smelting furnace (namely a smelting crucible), and the material is loaded in a mode that the bottom is compact and the upper part is loose, so that the bridging phenomenon can be avoided. After the blowing is accomplished, open the smelting power, make the silver-colored base material in the smelting furnace melt, at the melting in-process, reciprocal tilting smelting furnace makes the material slowly sink in the melting in-process, improves melting efficiency, if the bridging phenomenon appears, then need increase the tilting angle of smelting furnace to avoid the smelting furnace local overheat. And after the silver substrate is completely melted (the molten pool is calm and stops bubbling), continuously heating to ensure that the molten liquid reaches the pouring temperature.
In the process of melting the silver base material, the temperature of the molten liquid in the smelting furnace needs to be continuously detected, and various detection methods can be combined, such as thermocouple temperature measurement, infrared temperature measurement, mechanical temperature measurement and the like. Smelt the liquation of crucible and can adopt infrared temperature measurement and mechanical temperature measurement to combine together to ensure the accuracy of temperature measurement, at first descend the temperature measurement pole to liquation upper portion through mechanical mode, stay a period and preheat, preheat a period after, fall 0 with the mains power of smelting furnace, insert again and carry out the temperature measurement in the liquation, meanwhile, aim at the liquation with infrared temperature measurement module and carry out the temperature measurement, can obtain two numerical values like this, through the temperature of two numerical value accurate judgement liquations. And after the temperature measurement is finished, the power supply power of the smelting furnace is recovered to keep continuously heating the molten liquid.
S2, preheating the atomization chamber, and detecting the temperature in the atomization chamber in real time to enable the temperature in the atomization chamber to reach a preset temperature.
In the step, the purpose of preheating the atomization chamber is mainly to improve the ambient temperature in the atomization chamber, so that the spheroidization time of the silver liquid drops is increased in the subsequent atomization process, the spheroidization process of the silver liquid drops is realized in enough time, and the silver powder particles with better sphericity (roundness) are obtained.
As a specific embodiment, the process of preheating the atomization chamber comprises:
s21, introducing heat preservation gas with the temperature higher than the preset temperature into the atomizing chamber;
and S22, detecting the temperature in the atomization chamber in real time until the preset temperature is reached.
Specifically, the heat-insulating gas is also an inert gas, which may be the same as the atomizing gas, or an inert gas with different properties. The amount of the heat-insulating gas is such that the pressure in the atomizing chamber reaches a micro-negative pressure state (e.g., -0.01 MPa).
The temperature in the real-time detection atomizer chamber, accessible set up the sensor in the atomizer chamber and carry out real-time detection, after reaching preset temperature, can stop letting in the gaseous or the gaseous letting in that reduces the heat preservation of letting in of heat preservation.
As another alternative embodiment, preheating the atomization chamber comprises:
s21a, heating the wall surface of the atomizing chamber;
s22a, detecting the temperature inside the atomizing chamber in real time until the preset temperature is reached;
and S23a, continuously heating the wall surface of the atomizing chamber and keeping the temperature in the atomizing chamber.
Further, in the step S21a, when the wall surface of the atomizing chamber is heated, the air in the atomizing chamber may be circulated by a circulation fan disposed in the atomizing chamber, so as to accelerate the temperature rise of the environment in the atomizing chamber and equalize the ambient temperature in the atomizing chamber.
The wall surface of the atomizing chamber can be heated by a heating device (such as a heating pipe) arranged on the wall surface of the atomizing chamber, and meanwhile, in order to ensure that the temperature of the atomizing chamber is within a preset range, the wall surface of the atomizing chamber can be subjected to heat preservation treatment, such as adding a heat preservation layer.
And S3, controlling the silver melt to be poured into the tundish and uniformly flow out of the atomizing chamber.
Specifically, the tundish is heated while the heat preservation gas is introduced or after the heat preservation gas is introduced, so that the tundish meets the requirement of the pouring temperature.
Specifically, the molten metal is controlled to be poured into the tundish in a thin liquid column, the molten metal with the height not more than 2cm is remained in the tundish, the uniform control is realized, and when the molten metal smoothly flows in a columnar shape, the gas can be opened for carrying out the atomization process.
And S4, introducing high-pressure inert gas, spraying the inert gas from the atomizing nozzle, and atomizing the dropped silver melt.
Specifically, the silver melt flows into the atomizing nozzle through the liquid guide pipe at the bottom of the tundish under the action of the gravity of the silver melt, the flowing silver melt is impacted and broken by high-pressure controllable inert gas in the atomizing nozzle, so that the silver melt is atomized into fine liquid drops, and the liquid drops fall in the atomizing furnace and are spheroidized, cooled and solidified into spherical metal powder in the falling process.
Because the temperature of the atomizing chamber is increased, the time for spheroidizing the liquid drops is prolonged if the cooling time is longer in the falling process of the liquid drops, and the sphericity of particles formed by the finally cooled liquid drops is better.
Further, the step S4 further includes:
s41, monitoring the temperature in the atomization chamber in real time in the atomization process, and if the real-time temperature is not in a preset range, regulating and controlling the temperature in the atomization chamber to keep the temperature in the preset range.
The atomizing device is influenced by atomizing gas and external environment, and the temperature of the atomizing chamber possibly fluctuates in the atomizing process, so that the temperature in the atomizing chamber can be regulated and controlled by regulating heating power, the temperature of the atomizing chamber is ensured to be always in a reasonable range, and the spheroidizing time of liquid drops is ensured.
And S5, cooling and collecting powder after atomization is finished.
After atomization, the silver powder particles are cooled at the bottom of the atomization chamber, and then the silver powder is collected through the cyclone separation system.
Further, in step S5, before cooling, the method further includes the steps of:
and S50, reducing the pressure of the atomizing gas, and stopping introducing the atomizing gas after continuously purging for a period of time.
Specifically, after atomization is finished, a smelting and tundish heat-insulating power supply is closed, the pressure of atomized gas is reduced, and purging is continued for a period of time (such as 30 seconds). This ensures the completeness of atomization and allows the local region of the atomization chamber to be cleaned.
The cooling process can be carried out according to specific requirements through a water circulation cooling mode, and if molten liquid remains in the smelting furnace, the cooling time needs to be prolonged to avoid damage to the coil.
Compared with the prior art, in the process of the silver powder manufacturing method, the cooling time of the liquid drops is prolonged by pre-increasing the environmental temperature in the atomizing chamber, so that the spheroidization time of the liquid drops is longer, the silver powder particles obtained after final cooling have better sphericity (roundness), and the product quality of the silver powder particles is improved.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (10)
1. A method for producing a silver powder, comprising the steps of:
s1, putting a pure silver substrate into a smelting furnace for heating and melting to obtain silver melt;
s2, preheating the atomization chamber, and detecting the temperature in the atomization chamber in real time to enable the temperature in the atomization chamber to reach a preset temperature;
s3, controlling the silver melt to be poured into the tundish and uniformly flowing out of the atomizing chamber;
s4, introducing high-pressure inert gas, spraying the inert gas from an atomizing nozzle, and atomizing the dropped silver melt;
and S5, cooling and collecting powder after atomization is finished.
2. The method for producing silver powder according to claim 1, wherein the process of step S2 includes:
s21, introducing heat preservation gas with the temperature higher than the preset temperature into the atomizing chamber;
and S22, detecting the temperature in the atomizing chamber in real time until the preset temperature is reached.
3. The method for producing a silver powder according to claim 2, wherein in the step S21, the temperature of the inert gas is the same as or close to the temperature of the insulating gas introduced into the atomizing chamber.
4. The method for producing silver powder according to claim 2, wherein the insulating gas is also an inert gas.
5. The method for producing silver powder according to claim 1, wherein the process of step S2 includes:
s21a, heating the wall surface of the atomizing chamber;
s22a, detecting the temperature inside the atomizing chamber in real time until the preset temperature is reached;
and S23a, continuously heating the wall surface of the atomizing chamber and keeping the temperature in the atomizing chamber.
6. The method for producing silver powder according to claim 5, wherein in the step S21a, when the wall surface of the atomizing chamber is heated, air in the atomizing chamber is circulated.
7. The method for producing silver powder according to claim 1, wherein the step S4 further comprises:
s41, monitoring the temperature in the atomization chamber in real time in the atomization process, and if the real-time temperature is not in a preset range, regulating and controlling the temperature in the atomization chamber to keep the temperature in the preset range.
8. The method for producing silver powder according to claim 1, further comprising, before cooling in step S5, the steps of:
and S50, reducing the pressure of the atomizing gas, and stopping introducing the atomizing gas after continuously purging for a period of time.
9. The method for producing silver powder according to claim 1, wherein in step S3, the molten silver remaining in the tundish is less than 2cm deep.
10. The method for producing silver powder according to claim 2, wherein the process of step S2 further comprises:
and S23, continuously introducing heat preservation gas to keep the temperature in the atomizing chamber at a preset temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210816288.4A CN115213419A (en) | 2022-07-12 | 2022-07-12 | Silver powder manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210816288.4A CN115213419A (en) | 2022-07-12 | 2022-07-12 | Silver powder manufacturing method |
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| Publication Number | Publication Date |
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| CN115213419A true CN115213419A (en) | 2022-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210816288.4A Pending CN115213419A (en) | 2022-07-12 | 2022-07-12 | Silver powder manufacturing method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03247702A (en) * | 1990-02-23 | 1991-11-05 | Asahi Chem Ind Co Ltd | Silver-containing alloy powder and electric conductive paste using this powder |
| CN105397098A (en) * | 2015-12-07 | 2016-03-16 | 励福(江门)环保科技股份有限公司 | Preparation method of Ag powder for cold spraying |
| CN112517918A (en) * | 2020-12-02 | 2021-03-19 | 青岛云路先进材料技术股份有限公司 | Preparation method and production equipment of high-sphericity gas atomized powder |
| CN113517093A (en) * | 2021-04-22 | 2021-10-19 | 苏州海力金属粉体材料有限公司 | Preparation method of spherical silver powder conductive paste |
| CN114042925A (en) * | 2021-11-29 | 2022-02-15 | 湖南天际智慧材料科技有限公司 | Preheating device for atomization chamber |
| CN114589310A (en) * | 2022-03-11 | 2022-06-07 | 晶高优材(北京)科技有限公司 | Preparation method of micron spherical silver powder |
-
2022
- 2022-07-12 CN CN202210816288.4A patent/CN115213419A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03247702A (en) * | 1990-02-23 | 1991-11-05 | Asahi Chem Ind Co Ltd | Silver-containing alloy powder and electric conductive paste using this powder |
| CN105397098A (en) * | 2015-12-07 | 2016-03-16 | 励福(江门)环保科技股份有限公司 | Preparation method of Ag powder for cold spraying |
| CN112517918A (en) * | 2020-12-02 | 2021-03-19 | 青岛云路先进材料技术股份有限公司 | Preparation method and production equipment of high-sphericity gas atomized powder |
| CN113517093A (en) * | 2021-04-22 | 2021-10-19 | 苏州海力金属粉体材料有限公司 | Preparation method of spherical silver powder conductive paste |
| CN114042925A (en) * | 2021-11-29 | 2022-02-15 | 湖南天际智慧材料科技有限公司 | Preheating device for atomization chamber |
| CN114589310A (en) * | 2022-03-11 | 2022-06-07 | 晶高优材(北京)科技有限公司 | Preparation method of micron spherical silver powder |
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Application publication date: 20221021 |
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