Supersonic gas atomization spraying disc for metal powder preparation

Abstract

The invention relates to a supersonic gas atomization spraying disc for metal powder preparation. The supersonic gas atomization spraying disc for metal powder preparation comprises a spraying disc upper lip and a spraying disc lower lip. An annular cooling water cavity is formed inside the spraying disc upper lip. A center hole which penetrates through the thickness of the spraying disc upper lipis formed in the center of the spraying disc upper lip and used for allowing a flow guide nozzle to be placed. A gas inlet pipeline which is used for being connected with an external gas source is arranged on the spraying disc lower lip. An annular gas cavity can be formed after the spraying disc lower lip and the spraying disc upper lip are assembled, and a nozzle which is of a semi-Laval structure is formed in an outlet of the annular gas cavity after the spraying disc upper lip and the spraying disc lower lip are assembled. According to the supersonic gas atomization spraying disc for metal powder preparation, the thermal deformation of the spraying disc is reduced by circulating cooling water, the sealing performance of the whole spraying disc structure is protected, and the service life of the spraying disc is prolonged. The spraying disc upper lip and the spraying disc lower lip are assembled to form the nozzle which is of the circular seam type semi-Laval structure, and the width of the throat portion of the nozzle is adjustable. According to the supersonic gas atomization spraying disc for metal powder preparation, a technological adjustment window is wide, the gas consumption is low, the gas flow inside the spraying disc is uniform, and the fine powder yield can be substantially improved.

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 disk used 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 also determines the product quality. Cost, an important prerequisite for ensuring the quality and performance of industrial products. [0003] Nowadays, gas atomization technology has become one of the important methods for large-scale preparation of high-quality metal powder. When gas atomization is used to prepare metal powder, the high-speed airflow impacts the metal liquid flow, breaking it into fine met...

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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