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Metal powder preparation method and device based on direct resistance heating non-contact smelting

A technology of metal powder and preparation equipment, which is applied in the field of gas atomization, can solve the problems of unable to stably control the flow rate of molten metal and cannot meet the needs of industrial production, and achieve convenient real-time measurement and monitoring, reduce heating burden, and improve feeding efficiency. Effect

Inactive Publication Date: 2017-04-05
CHINA JIUYUAN HI TECH EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Self-suspension smelting technology (for example, the technology disclosed in Wei Jianjun's dissertation "Preparation of Metal and Alloy Nanoparticles and Their Structural Properties by Self-suspension Directional Flow Method") can always keep the molten metal in a non-contact state, but it cannot stably control the melting The flow rate of molten metal cannot meet the needs of industrial production

Method used

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  • Metal powder preparation method and device based on direct resistance heating non-contact smelting
  • Metal powder preparation method and device based on direct resistance heating non-contact smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for preparing metal powder based on direct resistance heating non-contact smelting, comprising the following steps:

[0053] Step 1: Make one end of the metal rod pass through the electrified graphite area at a constant speed.

[0054] Step 2: the metal rod is heated and melted in the electrified graphite region.

[0055] Step 3: The molten metal continuously forms metal droplets or streams under the action of gravity.

[0056] Step 4: The metal liquid droplet or liquid flow continuously drops into the gas atomization area.

[0057] Step 5: The high-pressure and high-speed inert gas impacts and disperses the metal droplets or liquid flow in the gas atomization area.

[0058] Step 6: The metal droplet or liquid flow is broken up by impact and then cooled to form metal powder.

[0059] All the above steps are usually carried out under vacuum conditions, because usually metals can chemically react with certain components in the air, and the components change. ...

Embodiment 2

[0064] A metal powder preparation device based on direct resistance heating non-contact melting, such as figure 1 shown, including:

[0065] A vacuum chamber 1, the vacuum chamber 1 is provided with an air extraction port and an outlet of the metal rod 3, and the air extraction port is connected to a vacuum extraction device;

[0066] A pair of rollers 2 arranged in the vacuum chamber 1, the axes of the two rollers 2 are parallel, the rotation directions of the two rollers 2 are opposite, and the rotation surface between the two rollers 2 The gap matches the diameter of the metal rod 3; the gap between the rotating surfaces of the two rollers 2 communicates with the outlet of the metal rod 3;

[0067] Both ends are provided with open graphite tubes 4, one end of the graphite tube 4 is connected to the outlet of the metal rod 3, and the other end is connected to the gas atomization nozzle 6 and the powder collector 8 in sequence;

[0068] A graphite tube 5 is arranged outside...

Embodiment 3

[0075] A metal powder preparation device based on direct resistance heating non-contact melting, such as figure 2 shown, including:

[0076] The vacuum chamber 1 is provided with an air suction port and an outlet of the metal rod 3, and the air suction port is connected with a vacuum suction device.

[0077] The vacuum chamber 1 is provided with a feed guide sleeve 10, a discharge guide sleeve 11 and a pair of rollers 2. The axes of the two rollers 2 are parallel, the rotation directions of the two rollers 2 are opposite, and the rotation surfaces of the two rollers 2 The gap between them matches the diameter of the metal rod 3; the axes of the feed guide sleeve 10, the discharge guide sleeve 11 and the quartz glass tube 12 are collinear; The gap between the material guide sleeve 10, the two rollers 2, the discharge guide sleeve 11 and the outlet of the metal rod 3.

[0078] A quartz glass tube 12 with a coil 13 wound outside, one end of the quartz glass tube 12 is connecte...

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Abstract

The invention relates to a metal powder preparation method and device based on DC (Direct Current) resistance heating non-contact smelting. The metal powder preparation method comprises the following steps: enabling one end of a metal rod to pass through an electrified graphite area at a uniform speed; heating to melt the metal rod in the electrified graphite area; continuously forming metal liquid drops from molten metal under the action of the gravity; continuously dripping the metal liquid drops to a gas atomization area; impinging and scattering the metal liquid drops by high-pressure and high-speed inertial gas in the gas atomization area, and cooling to form metal powder. The metal powder preparation device comprises a vacuum cavity, a pair of idler wheels and a graphite pipe, wherein the two idler wheels are parallel in the axial direction, the rotation directions of the idler wheels are opposite, and a gap between rotating surfaces of the two idler wheels is matched with the diameter of the metal rod; the gap between the rotating surfaces of the two idler wheels is communicated with a metal rod outlet; one end of the graphite pipe is connected with the metal rod outlet, and the other end of the graphite pipe is sequentially connected with a gas atomization nozzle and a powder collector. According to the metal powder preparation method and device, the flow velocity of molten metal liquid can be stably controlled, and the industrial production demands can be met.

Description

technical field [0001] The invention relates to the technical field of gas atomization, in particular to a metal powder preparation method and device based on direct resistance heating non-contact melting. Background technique [0002] The powder prepared by gas atomization technology has fine particle size, high sphericity and low oxygen content. It is currently an important method to produce high-performance spherical metal powder. [0003] The production principle of gas atomization technology is to use high-pressure gas to atomize high-temperature molten metal into fine metal powder. [0004] Usually, the gas atomization powder making device adopts the method of crucible melting, that is, the metal is melted in the crucible first, and then the molten metal is poured into the diversion device, and the molten metal flowing out from the diversion hole is rapidly melted under the action of high-pressure and high-speed airflow. Disperse to form fine powder. It is feasible f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08
Inventor 龚伟志赵午云孙伟孙静
Owner CHINA JIUYUAN HI TECH EQUIP