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Ultrasonic spray-forming method

A technology of ultrasonic spraying and spray deposition, which is applied in the field of ultrasonic spray forming, which can solve the problems of difficult atomizer processing and loose deposition structure, etc., and achieve the effect of rapid solidification structure characteristics, uniform microstructure, and fine grains

Inactive Publication Date: 2013-05-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processing of the atomizer is difficult, and due to overemphasis on cooling efficiency, the deposition structure is loose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] Embodiment: Take the Al-2.2Mg-9.8Zn-2.4Cu (mass fraction, %) alloy to make a cylindrical billet as an example to illustrate the specific implementation method:

[0024] (1) First evacuate the spray chamber to 5Pa, and then backfill it with argon to 90kPa;

[0025] (2) Keep the superheat of the alloy solution at 100°C, the molten metal flows to the surface of the arc-shaped tool head through a backflow tube with an inner diameter of 5mm, start the ultrasonic atomizer, adjust to the ultrasonic frequency 25kHz, and the atomization power is 200w. Under the action of ultrasonic vibration, it is atomized into metal droplets;

[0026] (3) Adjust the acceleration gas pressure to 0.3Mpa, the nozzle gas temperature is 10°C, the gas flow is doped with SiC powder, the powder flow rate is 50g per minute, and the flight distance is controlled to 600mm, so that the solid phase fraction of the atomized droplets before deposition is about 60 %~70%;

[0027] (4) Semi-solid metal drople...

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PUM

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Abstract

The invention relates to an ultrasonic spray-forming method, which is technically characterized in that: a novel molten metal atomization and deposition manner is provided according to the fundamental principle that molten metal flow is atomized into fine grains by spray-forming; and the fundamental principle of the manner is that: the molten metal flows on the surface of a tool head which vibrates at ultrasonic frequency to form a thin liquid layer; surface tension waves are surged under the action of ultrasonic vibration; liquid drops depart from wave crests when the amplitude of a vibrating surface reaches a certain value; the liquid drops rapidly hit a deposition plate or a collector and are fast solidified under the drive of high-speed inert gas; and metal blanks with required shapescan be manufactured through controlling the position and the angle of a receiver by using different shapes of collectors. The crystal grain of a microstructure of the manufactured blanks is finer.

Description

technical field [0001] The invention relates to an ultrasonic spray forming method, a method for preparing alloys and metal matrix composite parts thereof by spray forming technology, in particular to a metal atomization deposition method. Background technique [0002] Spray forming is a unique rapid solidification process. The process is to atomize molten metal into liquid particles of 10-200 microns, and then driven by high-speed airflow, the tiny particles are directly sprayed on the cooler corresponding receiver, such as Deposit discs or mold cavities to form corresponding products. Compared with the casting process, the formed high-quality material has a fine, equiaxed and homogeneous microstructure without segregation; compared with the rapid solidification powder metallurgy process, the spray-formed blank has low oxygen content and superior comprehensive mechanical properties. The forming process is less, the production cost is low, and the production efficiency is h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/115
Inventor 张贤杰王俊彪李玉军司朝润潘艾刚曹小宝
Owner NORTHWESTERN POLYTECHNICAL UNIV
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