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A kind of high sphericity nanostructure stainless steel powder and preparation method thereof

A nanostructure, high sphericity technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor coating performance, high porosity, and difficulty in nanostructured powders. The effect of good sphericity and fluidity, small particle size distribution and high bond strength

Active Publication Date: 2022-07-08
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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  • A kind of high sphericity nanostructure stainless steel powder and preparation method thereof
  • A kind of high sphericity nanostructure stainless steel powder and preparation method thereof
  • A kind of high sphericity nanostructure 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) The stainless steel powder and the process control agent (industrial alcohol) are added to the ball mill according to the content of industrial alcohol which is 1 / 2 of the volume of the ball mill, and the diameter is 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 rotational speed of 1400 RPM for 1 h, and ground to nano-scale to obtain a slurry of powder A;

[0044] (2) the slurry of powder A is sprayed and granulated in the spray drying system, the spray drying system is a closed-loop high-speed centrifugal spray dryer, and the parameters of the spray drying system are: the inlet temperature is 150 ℃, and the outlet temperature is 60 ℃. ℃, the rotation speed of the atomizer is 12000RPM, and the nano-agglomeration powder with a certain sphericity is obtained, and the nano-agglomerat...

Embodiment 2

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

[0052] (1) The stainless steel powder and the process control agent (deionized water) are added to the ball mill according to the content of industrial alcohol which is 2 / 3 of the volume of the ball mill, and the diameter of the addition is 3.0 according to the ratio of the ball to material ratio of 10:1. The zirconia grinding balls of mm in size were ground in a protective argon atmosphere at a certain rotation speed of 1200 RPM for 3 hours, and ground to nano-scale to obtain a slurry of powder A;

[0053] (2) the slurry of powder A is carried out spray granulation in the spray drying system, the spray drying system is a closed-loop high-speed centrifugal spray dryer, and the parameters of the spray drying system are: the temperature of entering the tower is 200 ° C, and the temperature of leaving the tower is 90 °C. ℃, the rotation speed of the atomizer is 15000RPM, and the nano-agglomeratio...

Embodiment 3

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

[0059] (1) The stainless steel powder and the process control agent (industrial alcohol) are added to the ball mill according to the content of industrial alcohol which is 3 / 4 of the volume of the ball mill, and the diameter is 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 rotation speed of 1300RPM for 2 hours, and ground to sub-micron level to obtain a slurry of powder A;

[0060] (2) the slurry of powder A is carried out spray granulation in the spray drying system, the spray drying system is a closed-loop high-speed centrifugal spray dryer, and the parameters of the spray drying system are: 180 ℃ of inlet temperature, and 80 ℃ of outlet temperature ℃, the rotation speed of the atomizer is 14000RPM, the nano-agglomeration powder with a certain sphericity is obtained, and the nano-agglom...

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Abstract

The invention discloses a preparation method of high-sphericity nano-structure stainless steel powder. The invention adopts spray granulation to obtain larger composite particles formed by agglomeration of nano stainless steel powder, and then uses a plasma spheroidization process to obtain nano-structured stainless steel powder. Structure, smooth and dense surface, high sphericity stainless steel powder. Through the combination of spray granulation and plasma spheroidization, the obtained stainless steel has extremely high sphericity, and is smooth and dense, which meets the requirements of 3D printing equipment for powder properties. The method of the invention is simple in operation, high in production efficiency, capable of mass production, has no pollution to the environment, and is an efficient and feasible powder preparation method.

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] Nobel laureate Feyneman predicted as early as the 1960s: If we control the microscopic arrangement of objects, we can make objects obtain a large number of extraordinary properties, and we can see earth-shaking changes in the properties of materials. These 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 exhibit different effects from general materials, mainly including surface effects, volume effects and quantum size. effect. The research of nanomaterials is a hot spot in material science research, and nanotechnology is recognized as one of the most promising scientific research fields in the 21st cen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/04B22F1/054B82Y30/00B82Y40/00
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
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