CN104028769A - Manufacturing method of high-green-strength atomized copper powder - Google Patents
Manufacturing method of high-green-strength atomized copper powder Download PDFInfo
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Abstract
The invention discloses a manufacturing method of high-green-strength atomized copper powder. The manufacturing method includes steps of smelting, specifically, placing solid-state pure-copper materials into a smelter and smelting to obtain liquid-state copper, and oxygenating during smelting; atomizing, ejecting atomized copper powder by a closed type V-shaped nozzle under the condition of high pressure when the liquid-state copper flows out of the smelter; drying, to be specifically, drying the copper powder subjected to atomization; reduction, reducing the dried copper powder by reducing gas; after-treatment, more specifically, coarsely crushing the reduced copper powder by a hammer mill, then finely crushing by a turbo type mill, finally screening by an ultrasonic screening machine with copper granularity of 150-600 meshes to obtain high-green-strength atomized copper powder. The manufacturing method of the high-green-strength atomized copper powder can manufacture copper powder in various and complicated shape, green strength of the copper powder is effectively improved, and loose-packed density of the copper powder is reduced.
Description
Technical field
The invention belongs to metal powder material, field of powder metallurgy, relate in particular to a kind of green strength higher than 15MPa, apparent density is lower than 2.0g/cm
3atomized copper powder and preparation method thereof.
Background technology
In present powder metallurgy industry, copper powder is a kind of widely used powder, is especially widely used in the industries such as oiliness bearing, product of carbon brush, friction material, electrical material.
Commercial its apparent density of water atomization copper powder is generally 2.5g/cm3-3.5g/cm3 at present, several enterprises can produce the low-apparent-density copper powder of 2.0g/cm3-2.5g/cm3, but the very low 5MPa that is generally no more than of the green strength of water atomization copper powder can only make small scale and add in part metallurgic product.
It is electrolyte that electrolytic copper powder adopts copper sulphate, by regulating current density to obtain copper powder from negative electrode, its advantage is that apparent density is low, be generally 1.0g/cm3-2.5g/cm3, green strength is high, is generally 10-15MPa, is widely used in Powder Metallurgy Industry, on specialities, green strength is still inadequate.Its shortcoming is that production technology adopts sulfuric acid solution, and periphery ecological environment is caused to severe contamination, and western developed country is just gradually reducing the production of electrolytic copper powder.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of high green atomized copper powder.
Object of the present invention can be achieved through the following technical solutions:
A preparation method for high green atomized copper powder, described method specifically comprises the following steps:
(1) melting processing: solid pure copper raw material is placed in to melt in furnace and obtains liquid copper, carry out oxygenation processing in fusion process;
(2) atomization processing: when liquid copper flows out smelting furnace, use closed type V-shaped nozzle ejection atomized copper powder under condition of high voltage;
(3) dry processing: the copper powder that atomization processing obtains to step (2) is dried;
(4) reduction is processed: utilize reducing gas to reduce to dry copper powder after treatment, the temperature that reduction is processed is 600-800 DEG C;
(5) post-processed: copper powder after treatment reduction is carried out to coarse crushing with beater grinder, carry out in small, broken bits with turbine type crushing machine again, speed 200-500rpm in small, broken bits, finally sieve with ultrasonic screening machine, sieving final copper powder granularity is 150-600 order, obtains the atomized copper powder of high green.
In described step (1), oxygenation processing is that oxygen is joined in smelting furnace, and the oxygen mass percentage content of the molten copper liquid after oxygenation is 8-15%.
In described step (1), temperature of smelting furnace is 1300-1500 DEG C.
In described step (1), temperature of smelting furnace is 1350-1450 DEG C.
Described step (2) mesohigh condition is: pressure is 20-35MPa, and preferably pressure is 28-32MPa.
In described step (3), be dried into centrifuge dewatering under normal temperature dry with vacuum heating treatment in one or both, described vacuum heating treatment condition is: vacuum 0.06MPa, 120 DEG C of temperature, rotating speed 5-7rpm.
In described step (4), reducing gas is hydrogen or is the mist of 25% nitrogen and 75% hydrogen.
The temperature that in described step (4), reduction is processed is preferably 650-700 DEG C.
Described step (5) needs to carry out titration anti-oxidant treatment with BTA in process in small, broken bits, and BTA consumption is the 0.001%-0.01% of copper powder weight.
BTA Chinese is BTA, can optionally measure silver, copper, zinc; In photograph industry, can be used as antifoggant, inhibitor; In antirust oil (fat) series products, be used for the vapour phase inhibitor of copper and copper alloy, lube oil additive; At circular water treating system, be also as corrosion inhibiter, such as motor vehicle antifreeze fluid etc.Also can with multiple antisludging agent, Biocidal algae-killing agent is used in conjunction with; At biological field, can be used as plant growth regulator.
Beneficial effect of the present invention: the present invention carries out oxygenation processing in the time of melting, the sliminess of raising copper melt, increases surface tension, more easily forms irregular powder while making its atomization; The present invention adopts high-pressure atomization, forms fine particle powder, is easy to sintering groupization in the time of reduction; The present invention reduces under 600-800 DEG C of high temperature, is easy to form sintering groupization, and powder shape is more complicated.
Compared to prior art, copper powder preparation method of the present invention can make complex-shaped changeable copper powder, effectively improves the green strength of copper powder, reduces the apparent density of copper powder.
Brief description of the drawings
Fig. 1 is the structural form of the copper powder for preparing of embodiment 1 under electron microscope.
Fig. 2 is the configuration of surface of copper particle in the copper powder for preparing of embodiment 1.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1
A preparation method for high green atomized copper powder, specifically comprises the following steps:
1, melting processing: solid pure copper raw material is placed in to melt in furnace and obtains liquid copper, temperature of smelting furnace is 1350 DEG C, in fusion process, carry out oxygenation processing, oxygenation processing is that oxygen is joined in smelting furnace, the oxygen mass percentage content that makes the molten copper liquid after oxygenation is 15%, and oxygenation processing can be that the molten metal copper in smelting furnace is blown to pure oxygen.
2, atomization processing: when liquid copper flows out smelting furnace, use closed type V-shaped nozzle ejection atomized copper powder under the condition of high voltage that is 30PMa at pressure.
3, dry processing: the copper powder that step 2 atomization processing is obtained is dried, this drying condition is that under normal temperature, centrifuge dewatering is dry, the general knowledge that this drying condition is these those skilled in the art, does not have materially affect to the present embodiment.
4, reduction is processed: utilize reducing gas to reduce to dry copper powder after treatment, reducing gas is the mist of 25% nitrogen and 75% hydrogen, and the temperature that reduction is processed is 650 DEG C.
5, post-processed: after first reduction being processed with beater grinder, copper powder carries out coarse crushing, then carries out in small, broken bitsly with turbine type crushing machine, and speed in small, broken bits is 200rpm.In process in small, broken bits, carry out titration anti-oxidant treatment with BTA, BTA consumption is 0.001% of copper powder weight, and with the screening of ultrasonic screening machine, final copper powder granularity is 150-600 order, obtains green strength higher than 15MPa, and apparent density is lower than 2.0g/cm
3finished product copper powder.
Known as depicted in figs. 1 and 2, the present invention carries out oxygenation processing in the time of melting, improves the sliminess of copper melt, increases surface tension, more easily forms irregular powder while making its atomization; Adopt high-pressure atomization, form fine particle powder, be easy to sintering groupization in the time of reduction; Under 650 DEG C of high temperature, reduce, be easy to form sintering groupization, powder shape is more complicated.
Compared to prior art, copper powder preparation method of the present invention can make complex-shaped changeable copper powder, effectively improves the green strength of copper powder, reduces the apparent density of copper powder.
Embodiment 2
A preparation method for high green atomized copper powder, specifically comprises the following steps:
1, melting processing: solid pure copper raw material is placed in to melt in furnace and obtains liquid copper, temperature of smelting furnace is 1450 DEG C, in fusion process, carry out oxygenation processing, oxygenation processing is that oxygen is joined in smelting furnace, the oxygen mass percentage content that makes the molten copper liquid after oxygenation is 8%, and oxygenation processing can be that the molten metal copper in smelting furnace is blown to pure oxygen.
2, atomization processing: when liquid copper flows out smelting furnace, use closed type V-shaped nozzle ejection atomized copper powder under the condition of high voltage that is 29PMa at pressure.
3, dry processing: the copper powder that step 2 atomization processing is obtained is dried, described being dried as vacuum heating treatment, vacuum heating treatment condition is: vacuum 0.06MPa, 120 DEG C of temperature, rotating speed 5-7rpm.
4, reduction is processed: utilize reducing gas to reduce to dry copper powder after treatment, reducing gas is hydrogen, and the temperature that reduction is processed is 750 DEG C.
5, post-processed: after reduction being processed with beater grinder, copper powder carries out coarse crushing, then carries out in small, broken bitsly with turbine type crushing machine, and speed in small, broken bits is 500rpm.In process in small, broken bits, carry out titration anti-oxidant treatment with BTA, BTA consumption is 0.01% of copper powder weight, and with the screening of ultrasonic screening machine, final copper powder granularity is 150-600 order, obtains green strength higher than 15MPa, and apparent density is lower than 2.0g/cm
3finished product copper powder.
Embodiment 3
A preparation method for high green atomized copper powder, specifically comprises the following steps:
1, melting processing: solid pure copper raw material is placed in to melt in furnace and obtains liquid copper, temperature of smelting furnace is 1400 DEG C, in fusion process, carry out oxygenation processing, oxygenation processing is that oxygen is joined in smelting furnace, the oxygen mass percentage content that makes the molten copper liquid after oxygenation is 10%, and oxygenation processing can be that the molten metal copper in smelting furnace is blown to pure oxygen.
2, atomization processing: when liquid copper flows out smelting furnace, use closed type V-shaped nozzle ejection atomized copper powder under the condition of high voltage that is 32PMa at pressure.
3, dry processing: the copper powder that step 2 atomization processing is obtained is dried, described being dried comprises that centrifuge dewatering is dry, vacuum heating treatment, vacuum heating treatment condition is: vacuum 0.06MPa, 120 DEG C of temperature, rotating speed 7rpm.These two kinds of modes can be carried out separately also can be in conjunction with carrying out.
4, reduction is processed: utilize reducing gas to reduce to dry copper powder after treatment, reducing gas is hydrogen, and the temperature that reduction is processed is 700 DEG C.
5, post-processed: carry out coarse crushing with beater grinder, then carry out with turbine type crushing machine in small, broken bits, speed 500rpm in small, broken bits.In process in small, broken bits, carry out titration anti-oxidant treatment with BTA, BTA consumption is 0.001%-0.01%.With the screening of ultrasonic screening machine, final copper powder granularity is 150-600 order, obtains green strength higher than 15MPa, and apparent density is lower than 2.0g/cm
3finished product copper powder.
Embodiment 4
A preparation method for high green atomized copper powder, specifically comprises the following steps:
1, melting processing: solid pure copper raw material is placed in to melt in furnace and obtains liquid copper, temperature of smelting furnace is 1300 DEG C, in fusion process, carry out oxygenation processing, oxygenation processing is that oxygen is joined in smelting furnace, the oxygen mass percentage content that makes the molten copper liquid after oxygenation is 12%, and oxygenation processing can be that the molten metal copper in smelting furnace is blown to pure oxygen.
2, atomization processing: when liquid copper flows out smelting furnace, use closed type V-shaped nozzle ejection atomized copper powder under the condition of high voltage that is 20PMa at pressure.
3, dry processing: the copper powder that step 2 atomization processing is obtained is dried, and is dried as vacuum heating treatment, and described vacuum heating treatment condition is: vacuum 0.06MPa, 120 DEG C of temperature, rotating speed 5-7rpm.
4, reduction is processed: utilize reducing gas to reduce to dry copper powder after treatment, reducing gas is the mist of 25% nitrogen and 75% hydrogen, and the temperature that reduction is processed is 800 DEG C.
5, post-processed: after first reduction being processed with beater grinder, copper powder carries out coarse crushing, then carries out in small, broken bitsly with turbine type crushing machine, and speed in small, broken bits is 200rpm.In process in small, broken bits, carry out titration anti-oxidant treatment with BTA, BTA consumption is 0.001% of copper powder weight, and with the screening of ultrasonic screening machine, final copper powder granularity is 150-600 order, obtains green strength higher than 15MPa, and apparent density is lower than 2.0g/cm
3finished product copper powder.
The above, be only most preferred embodiment of the present invention, not the present invention done to any pro forma restriction.Any those of ordinary skill in the art, are not departing from technical solution of the present invention scope situation, utilize the method content of above-mentioned announcement to make many possible variations and modification to technical solution of the present invention, all belong to the scope of claims protection.
Claims (9)
1. a preparation method for high green atomized copper powder, is characterized in that, described method specifically comprises the following steps:
(1) melting processing: solid pure copper raw material is placed in to melt in furnace and obtains liquid copper, carry out oxygenation processing in fusion process;
(2) atomization processing: when liquid copper flows out smelting furnace, use closed type V-shaped nozzle ejection atomized copper powder under condition of high voltage;
(3) dry processing: the copper powder that atomization processing obtains to step (2) is dried;
(4) reduction is processed: utilize reducing gas to reduce to dry copper powder after treatment, the temperature that reduction is processed is 600-800 DEG C;
(5) post-processed: copper powder after treatment reduction is carried out to coarse crushing with beater grinder, carry out in small, broken bits with turbine type crushing machine again, speed 200-500rpm in small, broken bits, finally sieve with ultrasonic screening machine, sieving final copper powder granularity is 150-600 order, obtains the atomized copper powder of high green.
2. the preparation method of high green atomized copper powder according to claim 1, is characterized in that, in described step (1), oxygenation processing is that oxygen is joined in smelting furnace, and the oxygen mass percentage content of the molten copper liquid after oxygenation is 8-15%.
3. the preparation method of high green atomized copper powder according to claim 1, is characterized in that, in described step (1), temperature of smelting furnace is 1300-1500 DEG C.
4. the preparation method of high green atomized copper powder according to claim 3, is characterized in that, in described step (1), temperature of smelting furnace is 1350-1450 DEG C.
5. the preparation method of high green atomized copper powder according to claim 1, is characterized in that, described step (2) mesohigh condition is: pressure is 20-35MPa, and preferably pressure is 28-32MPa.
6. the preparation method of high green atomized copper powder according to claim 1, it is characterized in that, in described step (3), be dried into centrifuge dewatering under normal temperature dry with vacuum heating treatment in one or both, described vacuum heating treatment condition is: vacuum 0.06MPa, 120 DEG C of temperature, rotating speed 5-7rpm.
7. the preparation method of high green atomized copper powder according to claim 1, is characterized in that, in described step (4), reducing gas is hydrogen or is the mist of 25% nitrogen and 75% hydrogen.
8. the preparation method of high green atomized copper powder according to claim 1, is characterized in that, the temperature that in described step (4), reduction is processed is preferably 650-700 DEG C.
9. the preparation method of high green atomized copper powder according to claim 1, is characterized in that, described step (5) is carried out titration anti-oxidant treatment with BTA in process in small, broken bits, and BTA consumption is the 0.001%-0.01% of copper powder weight.
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Cited By (7)
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| CN104493155A (en) * | 2014-12-12 | 2015-04-08 | 铜陵国传电子材料科技有限公司 | Manufacturing method of CuSn10 alloy bronze powder |
| CN110216293A (en) * | 2019-07-01 | 2019-09-10 | 铜陵国传电子材料科技有限公司 | A kind of production technology of high desnity metal injection moulding copper powder |
| CN110394457A (en) * | 2019-07-04 | 2019-11-01 | 铜陵鑫佳粉体新材料科技有限公司 | A kind of preparation method of high-performance thermal conductivity copper powder |
| CN111496263A (en) * | 2020-04-27 | 2020-08-07 | 江苏萌达新材料科技有限公司 | Method for reducing iron-cobalt-copper alloy powder bulk ratio |
| CN113894286A (en) * | 2021-04-15 | 2022-01-07 | 芜湖松合新材料科技有限公司 | Preparation method of high-quality copper powder |
| CN113976896A (en) * | 2021-11-15 | 2022-01-28 | 河南黄河旋风股份有限公司 | Method for preparing copper-tin alloy powder by diffusion |
| CN116079061A (en) * | 2022-11-24 | 2023-05-09 | 华亿轴承科技（江苏）有限公司 | Copper powder processing method for high-speed stable production |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104493155A (en) * | 2014-12-12 | 2015-04-08 | 铜陵国传电子材料科技有限公司 | Manufacturing method of CuSn10 alloy bronze powder |
| CN110216293A (en) * | 2019-07-01 | 2019-09-10 | 铜陵国传电子材料科技有限公司 | A kind of production technology of high desnity metal injection moulding copper powder |
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| CN110394457A (en) * | 2019-07-04 | 2019-11-01 | 铜陵鑫佳粉体新材料科技有限公司 | A kind of preparation method of high-performance thermal conductivity copper powder |
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| CN111496263A (en) * | 2020-04-27 | 2020-08-07 | 江苏萌达新材料科技有限公司 | Method for reducing iron-cobalt-copper alloy powder bulk ratio |
| CN113894286A (en) * | 2021-04-15 | 2022-01-07 | 芜湖松合新材料科技有限公司 | Preparation method of high-quality copper powder |
| CN113894286B (en) * | 2021-04-15 | 2023-06-23 | 芜湖松合新材料科技有限公司 | Preparation method of high-quality copper powder |
| CN113976896A (en) * | 2021-11-15 | 2022-01-28 | 河南黄河旋风股份有限公司 | Method for preparing copper-tin alloy powder by diffusion |
| CN116079061A (en) * | 2022-11-24 | 2023-05-09 | 华亿轴承科技（江苏）有限公司 | Copper powder processing method for high-speed stable production |
| CN116079061B (en) * | 2022-11-24 | 2024-02-02 | 华亿轴承科技（江苏）有限公司 | Copper powder processing method |
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Application publication date: 20140910 |