Device and method for producing medium and low melting point metals and oxide nitride powder

A technology for low melting point metals and nitrides, which is applied to the field of devices for producing medium and low melting point metals and oxygen or nitride powders, can solve the problems of low production efficiency, insufficient particle size, and difficult powder quality control, and achieves high production capacity, Excellent product quality and small equipment investment

Inactive Publication Date: 2006-06-07
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0002] The powder-making technology of medium and low melting point metals or alloys currently includes methods such as electrolytic powder making, reduction powder making and spray powder making. The former two cannot produce composite powder composed of metal and carbonitride, although the latter can produce composite powder. powder, but the powder produced by spraying often has low residual oxygen content, and the particle size is not fine enough, so mechanical grinding is required. powder method can not produce nano-sized powder
For the production of fine oxides and nitride fine powders, solvent evaporation-condensation and gas-phase chemical reaction methods are commonly used at present. These methods not only have low production efficiency and low cost, but also have small production scale, low output, and difficult control of powder quality.

Method used

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  • Device and method for producing medium and low melting point metals and oxide nitride powder
  • Device and method for producing medium and low melting point metals and oxide nitride powder
  • Device and method for producing medium and low melting point metals and oxide nitride powder

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Experimental program
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Effect test

Embodiment 1

[0029] Implementation 1: Production of ultra-fine zinc powder by three-phase AC arc vaporization

[0030] use figure 1 The operation process of the shown device to produce ultra-fine zinc powder is as follows: put No. 4 zinc (about 60 kg) into the graphite crucible, heat the crucible in a well-type resistance furnace to melt the zinc, and the zinc melt is overheated to 570 ℃, and then lift the zinc crucible with a crane to transfer the zinc melt into the conical graphite container of the three-phase arc vaporization device (6), and adjust the temperature of the zinc liquid in the conical graphite zinc container to not be lower than 470 ℃ (a 5KW spiral conical electric heating tube can be used below this temperature). Start the three-phase transformer to make the voltage of the three-phase live line to the neutral line reach 115 volts, and then start the conical control valve, and the zinc liquid will be ejected from the three horizontal thin runners (20), and the impact will ...

Embodiment 2

[0032] Implementation 2: Production of ultrafine Al by three-phase AC arc vaporization 2 o 3 powder

[0033] use figure 1 The device shown produces Al 2 o 3 Powder, with No. 4 aluminum as raw material, its equipment and operation process are all identical with embodiment 1, and difference only has three points: (1) the aluminum liquid that transfers in the conical graphite container (6) from resistance melting furnace should keep Above 720°C, and below 720°C, the spiral conical auxiliary electric heater should be started to raise the temperature above this temperature; (2) The protective gas fed into the vaporizer is no longer nitrogen or argon, but industrial oxygen with a purity of 99.5% . This oxygen will oxidize the aluminum vapor formed during arc vaporization to Al 2 o 3 (3) When producing metal oxides, the sealing measures of the powder collection system do not need to be strict, and proper air leakage is also beneficial to further oxidize the unoxidized aluminum...

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Abstract

The present invention is apparatus and method for producing medium and low melting point metals and their oxide or nitride powder, and belongs to the field of interdisciplinary powder metallurgy and machine building technology. The present invention produces metal or alloy powder of melting point in 185-899 deg C in a triphase AC arc vaporizing apparatus, and the triphase AC arc vaporizing process after opening the conic valve is one process including the steps of forming reciprocating liquid flow bridge of molten metal among three electrodes, neck reducing, arcing, breaking liquid flow bridge to vaporize metal and re-forming liquid flow bridge. The present invention has the advantages of high production speed, high product quality, fine powder granularity, low power consumption, etc.

Description

Technical field: [0001] The invention relates to a device and method for producing medium and low melting point metals and oxygen or nitride powder, which belongs to the technical field of interdisciplinary powder metallurgy and mechanical manufacturing. Background technique: [0002] The powder-making technology of medium and low melting point metals or alloys currently includes methods such as electrolytic powder making, reduction powder making and spray powder making. The former two cannot produce composite powder composed of metal and carbonitride, although the latter can produce composite powder. powder, but the powder produced by spraying often has low residual oxygen content, and the particle size is not fine enough, so mechanical grinding is required. None of the powder methods can produce nano-sized powders. To produce fine oxides and nitride fine powders, solvent evaporation-condensation and gas-phase chemical reaction methods are commonly used at present. These m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/14
Inventor 王飚王宇栋张自华
Owner KUNMING UNIV OF SCI & TECH
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