Atomizer and application thereof

Abstract

The invention discloses an atomizer, which is composed of a guide tube, a metal jacket, a nozzle, a heating element, a ceramic sealing ring, etc. There is a gap between the guide tube and the metal jacket, and a heating element is installed in the gap. The surface is equipped with a metal reflective film or a sprayed reflective coating. The metal jacket tapers from top to bottom at one end close to the 1 / 3~1 / 2 of the lower end outlet to form an outer cone, and the lower end is connected with the diversion The tube is flush, and the gap between the outer cone of the metal jacket and the outlet at the lower end of the draft tube is sealed with a ceramic sealing ring. The atomizer of the invention can effectively prevent metal and alloy clogging and solve the purpose of clogging. The atomizer of the invention is suitable for metal or alloy atomized melt diversion, and has the advantages of simple structure, convenient installation, improved production efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of producing ultrafine powder by gas atomized molten liquid, and more specifically relates to an atomizer and its application in the preparation process of metal or alloy ultrafine powder. Background technique [0002] The gas atomization method is widely used in the preparation of metal and alloy powders. The principle of powder production is to impact the molten metal with a high-speed airflow, break the liquid metal into small droplets, and rapidly cool and solidify into powder during the subsequent flight. . Gas atomized powder has the advantages of high sphericity and controllable powder particle size, and has become the main direction for the preparation of high-performance metal and special alloy powders. [0003] The atomizer nozzle is the core of gas atomization technology. The nozzle controls the action process of the gas flow on the metal liquid flow, so that the kinetic energy of the gas flow is...

AI Technical Summary

Problems solved by technology

The second is that the metal droplets splash back during the atomization process, that is, the atomized droplets fly in the direction of the airflow atomization nozzle, and the splashed metal droplets adhere to the lower end of the airflow atomization nozzle, and continue to solidify and accumulate , which eventually leads to blockage of the guide tube on the center hole of the airflow atomization nozzle and interrupts the atomization process

However, the following problems of this atomizer are worth discussing. First, the diversion tube has the ability of conducting electricity and high temperature resistance, and the first electrode and the second electrode are both high temperature resistant electrodes. High, and the diversion tube is often deformed when it is electrified, which will affect the atomization effect. The electrode material needs to prevent the reaction with the metal melt and high temperature resistance; The composite electrode is placed inside the draft tube, and it is difficult to introduce an external power source, and there are also difficulties in operability; thirdly, the design of the composite electrode in the draft tube is difficult to control the particle size of the particles obtained during the atomization process. This is because when the melt is ejected from the outlet of the draft tube, it presents a hollow melt with a large circumference, and it is difficult to control the particle size of the powder; fourth, any collision between the draft tube and the composite electrode , are likely to cause damage to the diversion tube, and even lead to the occurrence of short circuits

Fifth, this kind of atomizer is difficult to disassemble. In case of electrode breakage and metal or alloy blockage, the entire atomizer can only be removed, and the blocked metal or alloy is melted by external heating, and the electrode is taken out , After replacing the electrode, fix the atomizer again, so that the workload of each disassembly is very large, which reduces the production efficiency

Therefore, the design and implementation of the atomizer structure is difficult

[0007] In short, how to solve the problem of the blockage of the atomizer without affecting the production efficiency is a difficult problem

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