Hot-arc evaporation multi-cavity nano powder preparation device

A multi-cavity, nano-powder technology, which is applied in the field of thermal arc evaporation multi-chamber nano-powder preparation devices, can solve the problems of insufficient continuity, low production efficiency, and high operating time requirements, so as to reduce the time of vacuuming and avoid The effect of large-scale shutdown and avoidance of mutual contamination

Pending Publication Date: 2019-05-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0005] At present, in the single-chamber powder preparation equipment and process, most of the time is spent on vacuuming and vacuum maintenance during the cycle of vacuum extraction, powder generation and processing, and vacuum maintenance. It takes 3-4 hours for the equipment to be vacuumed, and the time for powder preparation is less than 0.5 hours. The time for vacuum extraction and vacuum maintenance accounts for 50%-70%, while the actual powder production time is 15-20%. In other words, the production efficiency is low. At the same time, due to the vacuum extraction and vacuum maintenance and repeated repetition of this process, a large amount of energy will be consumed, which will greatly increase the cost.
[0006] 2. Low purity and cross-contamination
[0007] For the single-chamber powder preparation equipment and process, after the nano-powder preparation of one material is prepared, if the powder of other materials is prepared, there will be powder residues in copper crucibles, equipment connections and other places that cannot be removed, resulting in When preparing the next powder, there is at least two kinds of mutual contamination between the powders, thereby reducing the purity of the nano-powders
[0008] 3. Unable to realize continuous production in the true sense
[0009] The current single-chamber powder preparation equipment and process are limited by the size of the anode material, and there will be insufficient continuity in the continuous feeding and supply process of the material
At the same time, since the powder collection process requires repeated vacuuming and vacuuming processes, the operation time is relatively high. This method cannot achieve continuous production on the premise of ensuring product quality in large-scale industrial production. In the near future phase out

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The hot arc evaporation multi-chamber nano-powder preparation device is equipped with at least two main chamber powder generating units;

[0046] Each main chamber powder generating unit is connected to the vacuum main pipeline 13 through respective vacuum branch pipelines 14, and the vacuum main pipeline is connected to the vacuum pump system 17;

[0047] Each main chamber powder generating unit is connected to the exhaust main pipe 2 through respective exhaust branch pipes 4, and each main chamber powder generating unit is respectively connected to the air intake main pipe 3 through respective air inlet branch pipes 7;

[0048] Each main chamber powder generating unit is connected to the arc power supply and the control system 1 through its own heat arc control signal line and its own feeding control signal line;

[0049] The main chamber powder generating unit includes a main chamber 9 and a heat arc device 6, the top of the main chamber is provided with a heat arc d...

Embodiment 2

[0063] Utilize the device described in embodiment 1 to realize the continuous production method of heat arc evaporation multi-cavity metal nanopowder, comprising the following steps:

[0064] (1) Place the target: Install a single metal or metal alloy target with the same composition or different composition on the anode holder of each independent cavity as the anode, and use a metal with a melting point higher than 3000°C as the cathode, and the metal is tungsten, platinum or molybdenum;

[0065] (2) Vacuuming: Close the hatches of each independent cavity, open the vacuum valves of each independent cavity, and vacuumize all the cavities until the vacuum degree is not higher than 10 -4 Pa, close the vacuum valves of each independent cavity;

[0066] (3) Arcing: Open the intake valves of each independent cavity, introduce 0.2-0.3 atmospheric pressure hydrogen as the working gas, and introduce 50-180V DC voltage between the cathode and the anode, and the anode starts to melt an...

Embodiment 3

[0073] Using the device described in Example 1 to realize the continuous production method of thermal arc evaporation multi-cavity carbon nano powder is the same as in Example 2, the difference is:

[0074] In the step (1), the anode target material is a mixture of different types of carbon and a catalyst, the carbon material is graphite, carbon black or activated carbon, the catalyst is a transition metal or yttrium oxide, and when the catalyst is a transition metal, the carbon nanotube obtained is Multi-walled carbon nanotubes, when the catalyst is yttrium oxide, the obtained carbon nanotubes are single-walled carbon nanotubes, and the atomic ratio of carbon atoms to metal atoms in the carbon material and catalyst mixture is 80-100;

[0075] When preparing carbon nanotubes and carbon nanospheres in the step (3) or step (7), the DC voltage passed in is 50-180V; the DC voltage passed in when preparing nano-graphite is 40-60V, and the discharge current is 90V. -120A;

[0076] ...

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Abstract

The invention relates to the technical field of nano powder preparation, in particular to a hot-arc evaporation multi-cavity nano powder preparation device. The hot-arc evaporation multi-cavity nano powder preparation device is provided with two or more main chamber powder generating units; all the main chamber powder generating units are connected to an arc power supply and a control system through hot-arc control signal lines and feeding control signal lines of the main chamber powder generating units correspondingly; the main chamber powder generating units comprise main chambers and hot-arc devices; the hot-arc devices are arranged at the tops of the main chambers, and collecting chambers are formed in the bottoms of the main chambers; the hot-arc devices comprise cathodes arranged atthe tops of the main chambers and extending into the main chambers, and cathode control devices controlling the cathodes to move in the three directions; and anodes are arranged under the cathodes ina directly facing mode, automatic feeding devices are arranged at the rear ends of the anodes to control feeding of the anodes, and cooling water devices are arranged at the front ends of the anodes to cool the anodes. The production efficiency is improved greatly, and the cost is lowered; and simultaneous preparation and continuous production of various powder with different components are achieved, mutual pollution during powder preparation is avoided, and the purity of the powder is improved.

Description

technical field [0001] The invention relates to the technical field of nano powder preparation, in particular to a heat arc evaporation multi-cavity nano powder preparation device. Background technique [0002] DC arc plasma is an effective heat source for preparing nanoparticles, especially "core / shell" metal (alloy) nanocomposite particles, carbon-related materials and ceramic nanomaterials. At present, this method has initially achieved mass production, such as Chinese patent application: A multi-source direct current arc automatic nano-powder production system and method (201410189518.4), but for large-scale industrial production, there are still many technical problems, mainly in how to achieve high efficiency, low cost, high purity, no Pollution and continuous preparation of nanopowders. [0003] Existing nanopowder preparation equipment is mainly aimed at the generation, grading, trapping and processing of nanopowder in a single chamber, that is, a single generation ...

Claims

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Application Information

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IPC IPC(8): B22F9/14B22F9/12
Inventor 黄昊黄子岸吴爱民
Owner DALIAN UNIV OF TECH
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