Gas atomization device and method for secondary atomization and accelerated cooling

An accelerated cooling and secondary atomization technology, which is applied in the field of secondary atomization and accelerated cooling gas atomization devices, can solve the problems of reduced powder yield, increased oxygen content, and long-time cooling of powder, achieving Improve the yield of fine powder, improve the powder output rate, and avoid the effect of powder accumulation

Active Publication Date: 2020-09-29
ZHONGTIAN SHANGCAI ADDITIVE MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon directly causes the powder to be cooled for a long time, so that the oxygen content increases, the total powder yield decreases, and the "crust" needs to be cleaned regularly, which seriously affects product quality and production efficiency.

Method used

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  • Gas atomization device and method for secondary atomization and accelerated cooling
  • Gas atomization device and method for secondary atomization and accelerated cooling
  • Gas atomization device and method for secondary atomization and accelerated cooling

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The Ni-Cr-W-B powder for laser cladding is prepared by using the patent application of the present invention. The specific process is: use 220kg Ni-Cr-W-B alloy bar as the raw material, vacuumize to 5Pa, and use the contact thermocouple thermometer to measure the temperature of the molten steel Fill the equipment with argon gas to 101kPa at 1750±20°C, turn on the back-end fan, wait for the fan to reach a stable suction condition, open the back-end exhaust valve, and start pouring atomization when the system pressure is 95kPa, atomization The pressure is 5MPa. After stable atomization in the primary atomization area, open the gas hand valve of the annular pipeline for secondary atomization and accelerated cooling.

[0030] Preferably, the high-pressure hose adopts DN25 pipe with a pressure resistance of 24MPa, and the hose is wrapped with fire-resistant cotton. The gas pressure of the secondary atomization pipeline is 1MPa, and the flow rate is 10m 3 / min.

[0031] Pr...

Embodiment 2

[0034] The Ni-Cr-Mo-W powder for laser cladding is prepared by using the patent application of the present invention. The specific process is: use 213kg of Ni-Cr-Mo-W alloy rod as raw material, vacuumize to 5Pa, and use a contact thermocouple thermometer When the temperature of molten steel is measured to be 1730±20°C, fill the equipment with argon to 101kPa, turn on the back-end fan, wait for the fan to reach a stable suction condition, open the back-end exhaust valve, and start pouring when the system pressure is 95kPa Atomization, the atomization pressure is 4.5MPa. After stable atomization in the primary atomization area, open the gas hand valve of the annular pipeline for secondary atomization and accelerated cooling.

[0035] Preferably, the high-pressure hose adopts DN25 pipe with a pressure resistance of 24MPa, and the hose is wrapped with fire-resistant cotton. The gas pressure of the secondary atomization pipeline is 0.8MPa, and the flow rate is 8m3 / min.

[0036] ...

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Abstract

The invention discloses a gas atomization device and method for secondary atomization and accelerated cooling. The device is fixedly arranged on the furnace wall of an atomization chamber and comprises an upper support, a lower support, a nozzle, a high-pressure hose and a pipeline flange; the upper support and the lower support are fixed to the inner side of the furnace wall up and down respectively, and a plurality of screw holes are distributed on each of the upper support and the lower support; a nozzle outer sleeve is fixedly arranged between the upper support and the lower support, the nozzle outer sleeve is connected with the upper support and the lower support through adjusting bolts, the bottom of the nozzle is fixedly arranged in the nozzle outer sleeve, a hollow cavity is formedin the nozzle, the high-pressure hose penetrates through the nozzle outer sleeve to be in communication with the bottom of the nozzle, and the other end of the high-pressure hose penetrates through the furnace wall to be in communication with the pipeline flange; and the pipeline flange is fastened and sealed with a furnace wall flange on the outer side of the furnace wall through fixing bolts. The gas atomization device has the advantages that secondary atomization is carried out on liquid drops which are not sufficiently atomized for the first time, so that the yield of fine powder is increased, and the oxygen content of the powder is reduced.

Description

technical field [0001] The invention relates to the field of preparing metal powder by vacuum atomization, in particular to a gas atomization device and method for secondary atomization and accelerated cooling. Background technique [0002] Nowadays, with the demand of industrialization development, additive manufacturing technology has developed rapidly due to its short research and development cycle, no new consumables, and the ability to manufacture complex parts and many other advantages. In particular, metal 3D printing technology has become the focus of international scholars' research. The raw material for metal 3D printing is metal powder with a certain particle size, which requires pure chemical composition, low oxygen content, high sphericity, good fluidity and bulk density to meet certain requirements. Due to the late start of my country's 3D printing technology, despite the strong support of the government, a large number of institutions that develop metal 3D pri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08
CPCB22F9/082B22F2009/088B22F2009/0876Y02P10/25
Inventor 陈洋吴文恒顾孙望卢林张亮缪旭日郭韶山车鹏张天原
Owner ZHONGTIAN SHANGCAI ADDITIVE MFG CO LTD
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