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Multi-stage free-style gas atomization spray disc with gas self-circulation function

A self-circulation and gas atomization technology, applied in the field of powder metallurgy, can solve the problems of increasing production cost, increasing gas consumption, increasing the burden on the rear fan of the atomizing system, and achieving the effect of gas balance

Active Publication Date: 2019-04-26
SHANGHAI RES INST OF MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the traditional free gas atomization technology, the pressure difference between the melting chamber and the atomization chamber is usually used, that is, the pressure of the melting chamber is higher than that of the atomization chamber to reduce the back spray and splash during the atomization process, so as to ensure the smoothness of the atomization process. If it is carried out smoothly, this kind of solution will not only increase the burden on the rear fan of the atomization system, but also increase the consumption of gas and increase the production cost

Method used

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  • Multi-stage free-style gas atomization spray disc with gas self-circulation function
  • Multi-stage free-style gas atomization spray disc with gas self-circulation function
  • Multi-stage free-style gas atomization spray disc with gas self-circulation function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A multi-stage free-style gas atomization spray disc with gas self-circulation function, such as figure 1 As shown, it includes the auxiliary nozzle, the main nozzle and the circulating gas guide 5, the middle of the auxiliary nozzle is the melt channel, the surrounding of the auxiliary nozzle is the auxiliary nozzle air chamber 3, the middle of the circulating gas guide 5 is the melt channel, and the main The middle of the nozzle is a melt channel, the main nozzle is surrounded by the main nozzle air chamber 11, the auxiliary nozzle is connected to the upper end of the circulating gas guide 5, the lower end of the circulating gas guide 5 is connected to the main nozzle, the melt channel of the auxiliary nozzle, the circulation The melt channel of the gas guide 5 and the melt channel of the main nozzle are connected up and down, and a circulation guide channel 8 is formed between the circulating gas guide 5 and the main nozzle, and the circulation guide channel 8 is conne...

Embodiment 2

[0051] The multi-stage free-style gas atomization spray disc in Example 1 was used for gas atomization.

[0052] Use the nozzle of the present invention on the smelting equipment without crucible induction electrode to prepare TC4 titanium alloy powder. The diameter range of the raw material rod used is 40-50 mm, and the mass median particle diameter of the prepared powder is D 50 For: 45μm≤D 50 ≤70μm. The atomizing gas pressure of the auxiliary nozzle is 0.38MPa, the atomizing air pressure of the main nozzle is 3.8MPa, and no splash occurs during the atomization process. Typical characteristics of its powder see figure 2 , its powder particle size test report see image 3 .

Embodiment 3

[0054] The difference from Example 2 is that the atomizing gas pressure of the auxiliary nozzle is adjusted to 0.4MPa, and the atomizing pressure of the main nozzle is 4.0MPa. At this time, the particle size of the metal powder prepared is D 50 45.5μm, particle size report see Figure 4 .

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Abstract

The invention relates to a multilevel free-type gas atomization spraying tray with the gas self-circulation function. The multilevel free-type gas atomization spraying tray comprises an auxiliary nozzle, a main nozzle and a recycling gas flow guide part. The auxiliary nozzle is connected with the upper end of the recycling gas flow guide part, and the lower end of the recycling gas flow guide partis connected with the main nozzle. A melt channel of the auxiliary nozzle, a melt channel of the recycling gas flow guide part and a melt channel of the main nozzle communicate with one another up and down. A recycling flow guide channel is formed between the recycling gas flow guide part and the main nozzle. The recycling flow guide channel communicates with the melt channel of the main nozzle,and when the main nozzle is installed on a partition plate between a smelting chamber and an atomizing chamber, the recycling flow guide channel can communicate with the atomizing chamber. Compared with the prior art, auxiliary nozzle airflow is used for draining molten steel and further lowering negative pressure of a main nozzle atomization area, main nozzle jacket holes and the recycling gas flow guide part are used for achieving atomizing gas self-circulation, and therefore gas balancing of the main nozzle atomization area is realized, and stable and smooth execution of the atomizing process is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to an atomization spray disk, in particular to a multi-stage free gas atomization spray disk with gas self-circulation function. Background technique [0002] The metal powder prepared by gas atomization has many advantages such as high sphericity, good fluidity and low oxygen content. After years of development and improvement, gas atomization pulverization technology has developed into the main method of producing high-performance metal and alloy powder, and has become an important means to support and promote the research and development of new materials. Its basic principle is to use high-speed airflow to crush liquid metal into small liquid droplets and finally solidify into powder. The core of gas atomization technology is to control the process of gas on the metal liquid, so that the kinetic energy of high-speed airflow can be converted into metal powder to the greate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08B33Y70/00
Inventor 吴文恒卢林张亮龙倩蕾吴凯琦王涛
Owner SHANGHAI RES INST OF MATERIALS CO LTD
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