A supersonic gas atomizing spray disc for metal powder preparation

Abstract

The invention relates to a supersonic gas atomization spray disc for metal powder preparation, which comprises an upper lip of the spray disc and a lower lip of the spray disc, an annular cooling water cavity is arranged inside the upper lip of the spray disc, and a center of the upper lip of the spray disc has a through-hole The central hole of the thickness of the upper lip of the spray disc is used to place the guide nozzle. The lower lip of the spray disc is provided with an air intake pipe for connecting with an external air source. After the lower lip of the spray disc and the upper lip of the spray disc are assembled, an annular gas can be formed. After the upper lip of the spray disc and the lower lip of the spray disc are assembled, a nozzle with a semi-Laval structure is formed at the outlet of the annular air cavity. The invention reduces the thermal deformation of the spray disc by circulating cooling water, protects the sealing performance of the overall structure of the spray disc, and increases the service life of the spray disc. The upper lip of the spray disc and the lower lip of the spray disc are assembled to form a nozzle with a circular slot semi-Laval structure, and the width of the nozzle throat is adjustable. The process of the invention has wide adjustment window, low air consumption, uniform air flow inside the spray disc, and can greatly increase the yield of fine powder.

Description

technical field [0001] The invention relates to the technical field of metal powder preparation by gas atomization, in particular to a supersonic gas atomization spray disc for metal powder preparation. Background technique [0002] With the rapid iterative upgrading and rapid development of science and technology, spherical metal powder with fine particle size has gradually become the core raw material of many industrial products, and high-quality metal powder is the key factor to ensure the realization of product design ideas and core technology applications, and it is also the key factor that determines the product. Cost, an important prerequisite for ensuring the quality and performance of industrial products. [0003] Today, gas atomization technology has become one of the important methods for large-scale production of high-quality metal powders. When the metal powder is prepared by gas atomization, the high-speed airflow impacts the metal liquid flow, breaking it int...

AI Technical Summary

Problems solved by technology

[0005] Traditional supersonic gas atomization nozzles are generally of full Laval structure, requiring high assembly precision. If the gas atomization nozzle adopts the upper and lower lip split structure design, the assembly deviation at the nozzle will seriously affect the flow state of the airflow in the nozzle , causing the airflow velocity to be much lower than the expected velocity of the nozzle structure design; if the one-piece structure design strictly constrained by the Laval structure is adopted, the adjustment range of the gas atomization process will be limited, and the process adaptability of metal powder preparation will be reduced

In addition, when the restricted or tightly coupled structure is used for assembly, the tundish system and the flow guide device will transfer heat to the gas atomization spray plate, and the continuous thermal shock will cause obvious thermal deformation of the spray plate, reducing the air flow rate. The service life of the atomizing spray disc will greatly increase the production cost and seriously reduce the production efficiency

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