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High-sphericity-degree nano-structure stainless steel powder and preparation method thereof

A nanostructure, high sphericity technology, applied in the direction of improving energy efficiency, metal processing equipment, process efficiency, etc., can solve the problems of nanostructure powder difficulty, poor coating performance, reduced powder performance, etc., to achieve smooth and dense surface , Excellent performance, wide application effect

Active Publication Date: 2019-11-05
GUANGDONG ZHENGDE MATERIAL SURFACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common powder preparation methods include gas atomization, spray drying, etc. Although these two methods can produce powders with a certain degree of sphericity and fluidity, their own defects limit the application of powders. The method of gas atomization It is difficult to prepare nanostructured powder. During the preparation process, the oxygen content of the powder tends to increase and reduce the performance of the powder. However, the surface of the powder prepared by spray drying is loose and the porosity is large, which makes the performance of the prepared coating poor.

Method used

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  • High-sphericity-degree nano-structure stainless steel powder and preparation method thereof
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  • High-sphericity-degree nano-structure stainless steel powder and preparation method thereof

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Effect test

Embodiment 1

[0042] Preparation steps of high sphericity nanostructured stainless steel powder:

[0043] (1) Add stainless steel powder and process control agent (industrial alcohol) into the ball mill according to the content of industrial alcohol that is 1 / 2 of the volume of the ball mill tank, and at the same time, add the diameter of 3.0mm according to the ratio of ball to material ratio of 10:1 The zirconia grinding balls were ground in a protective argon atmosphere at a certain speed of 1400RPM for 1h, and ground to the nanometer level to obtain a slurry of powder A;

[0044] (2) The slurry of powder A is sprayed and granulated in a spray drying system. The spray drying system is a closed cycle high-speed centrifugal spray dryer. The parameters of the spray drying system are: the inlet temperature is 150°C, and the outlet temperature is 60°C. ℃, atomizer rotation speed is 12000RPM, to obtain nano-agglomerated powder with a certain degree of sphericity, and obtain 75-100um nano-agglom...

Embodiment 2

[0051] Preparation steps of high sphericity nanostructured stainless steel powder:

[0052] (1) Add stainless steel powder and process control agent (deionized water) into the ball mill according to the industrial alcohol content of 2 / 3 of the volume of the ball mill tank, and at the same time add the ball to material ratio of 10:1 with a diameter of 3.0 mm of zirconia grinding balls, grind for 3 hours at a certain speed of 1200RPM in a protective argon atmosphere, and grind to the nanometer level to obtain a slurry of powder A;

[0053] (2) The slurry of powder A is sprayed and granulated in a spray drying system. The spray drying system is a closed cycle high-speed centrifugal spray dryer. The parameters of the spray drying system are: the inlet temperature is 200°C, and the outlet temperature is 90°C. ℃, atomizer rotation speed is 15000RPM, to obtain a certain spherical degree of nano-agglomerated powder, through sieving to obtain 75 ~ 100um nano-agglomerated powder B;

[...

Embodiment 3

[0058] Preparation steps of high sphericity nanostructured stainless steel powder:

[0059] (1) Add stainless steel powder and process control agent (industrial alcohol) into the ball mill according to the content of industrial alcohol content of 3 / 4 of the volume of the ball mill tank, and at the same time, add the diameter of 3.0mm according to the ratio of ball to material ratio of 10:1 The zirconia grinding balls were ground in a protective nitrogen atmosphere at a certain speed of 1300RPM for 2h, ground to submicron level, and the slurry of powder A was obtained;

[0060] (2) The slurry of powder A is sprayed and granulated in a spray drying system. The spray drying system is a closed cycle high-speed centrifugal spray dryer. The parameters of the spray drying system are: the inlet temperature is 180°C, and the outlet temperature is 80°C. ℃, atomizer rotation speed is 14000RPM, to obtain a certain spherical degree of nano-agglomerated powder, through sieving to obtain 75 ...

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Abstract

The invention discloses a preparation method of high-sphericity-degree nano-structure stainless steel powder. According to the preparation method, a spray granulation manner is used for obtaining large composite particles formed by agglomerating nano stainless steel powder, and then a plasma spheroidization process is used for obtaining the high-sphericity-degree nano-structure stainless steel powder with the smooth and compact surface. Through the technology combining spray granulation and plasma spheroidization, prepared stainless steel has the very high sphericity degree and is smooth and compact, and the requirement of 3D printing equipment for the powder performance is met. The method is simple in operation, high in production efficiency, capable of achieving high-volume production and free of pollution to the environment; and the powder preparation method is efficient and feasible.

Description

technical field [0001] The invention relates to the technical field of metal alloy powder preparation, in particular to a high-sphericity nanostructure stainless steel powder and a preparation method thereof. Background technique [0002] The Nobel laureate Feyneman predicted in the 1960s that if we control the microscopic arrangement of the object, we can make the object obtain a large number of extraordinary properties, and we can see that the performance of the material will undergo earth-shaking changes. Such materials are nanomaterials. Nanomaterials generally refer to ultrafine materials with a grain size of 1-100nm. When the grain size of the material is refined to nanometers, nanomaterials show different effects from general materials, mainly including surface effects, volume effects and quantum size. effect. The study of nanomaterials is a hotspot in material science research, and nanotechnology is recognized as one of the most promising scientific research fields...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F1/00
CPCB22F9/04B22F2009/043B22F1/065B22F1/14B22F1/148Y02P10/25
Inventor 曾德长邹永鸣吴姚莎邱兆国邱金勇
Owner GUANGDONG ZHENGDE MATERIAL SURFACE TECH