Double-layer gas atomizing nozzle suitable for field of metal powder preparation

Abstract

The invention relates to a double-layer gas atomizing nozzle suitable for the field of metal powder preparation. The double-layer gas atomizing nozzle mainly comprises a straight air inlet, an upper atomizing nozzle, a liquid guiding pipe and a lower atomizing nozzle; during the atomization process of the metal powder, the upper nozzle and the lower nozzle are used for atomizing the molten metal flowing out of the liquid guide pipe at the same time, the lower-layer nozzle provides high-speed jet flow for melt-liquid atomization, the upper-layer nozzle is used for preventing backflow generatedby atomization of the lower-layer nozzle, and providing an appropriate outlet suction negative pressure for the outlet of the diversion pipe. The double-layer gas atomizing nozzle solves the problem of obstruction of metal melt flow in a traditional restricted nozzle reflux area and has the characteristics of being simple in structure, convenient to adjust and high in reliability.

Description

technical field [0001] The invention relates to the technical field of metal powder preparation, in particular to the technical field of gas atomization to prepare metal powder. Background technique [0002] Metal powder is an important basic industrial raw material, widely used in high-tech fields such as automobile, metallurgy, national defense, electronics, chemical industry, medicine and biology, environmental protection, home appliances, aerospace, nuclear industry, etc. Among them, the preparation of fine metal powder and its subsequent deep processing technology have attracted more and more attention from developed countries in the world with the rapid development of high technology in the world. [0003] Compared with other powder making methods, the atomization method has high productivity and relatively simple equipment. It is one of the main metal powder preparation methods. The powder produced by the atomization method has accounted for about 50% of the total pow...

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Problems solved by technology

[0006] Due to the compact structure of the tightly coupled nozzle, there is a strong backflow phenomenon. The backflow atomized medium causes part of the molten metal to move upward and reversely. Between the gas outlet of the atomization nozzle, it affects the flow shape of the metal liquid flow and the jet field at the nozzle outlet. Changes in the atomization state will lead to a significant increase in the particle size of the metal powder prepared by atomization, which seriously affects the atomization process and the product quality of the atomized metal powder.

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