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Method for characterizing second phase of ferromagnetic alloy powder

An alloy powder, ferromagnetic technology, applied in the field of metal material and its structure characterization, can solve the problems of inability to characterize alloy powder by transmission electron microscope, inability to perform TEM/HRTEM characterization of equipment, damage, etc.

Active Publication Date: 2018-11-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The particle size of the powder prepared by the powder metallurgy method is above the micron scale, and it is impossible to directly characterize the alloy powder by transmission electron microscopy
Especially the ferromagnetic alloy powder samples cause serious pollution and damage to the electron microscope equipment, making it impossible to carry out convenient, fast and non-destructive TEM / HRTEM characterization
[0004] So far, for the morphology, size and structure characterization of the second phase of ferromagnetic alloy powder, there are no public reports at home and abroad that separate the second phase from the alloy powder for separate characterization

Method used

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  • Method for characterizing second phase of ferromagnetic alloy powder
  • Method for characterizing second phase of ferromagnetic alloy powder
  • Method for characterizing second phase of ferromagnetic alloy powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1: Characterization of the second phase of 14YWT alloy powder

[0069] Step 1: Put ferromagnetic alloy powder (14YWT alloy powder, particle size less than 150 μm) and nickel foam into a beaker filled with absolute ethanol for ultrasonic dispersion for 3 minutes to obtain nickel foam filled with ferromagnetic alloy powder as an electrolytic anode .

[0070] Step 2: Use nickel foam filled with alloy powder as the anode (the pore size of the pores in the foam nickel is less than or equal to 200 μm), and the stainless steel cylinder as the cathode, and put it into the electrolyte to electrolyze the electrolytic anode to separate the second phase from the iron matrix , using a magnet for magnetic separation to obtain an electrolyte solution containing the second phase. The electrolyte used is: 2% tetramethylammonium chloride, 15% acetylacetone, 3% glycerol, and the balance is absolute ethanol. The electrolysis method is: constant voltage electrolysis at room tempera...

Embodiment 2

[0078] Embodiment 2: Fe-14Cr-3W-0.4Ti-0.5Y 2 o 3 (wt.%) Second Phase Characterization of Alloy Powders

[0079] Step 1: Ferromagnetic alloy powder (Fe-14Cr-3W-0.4Ti-0.5Y 2 o 3 (wt.%) alloy powder, the particle size is less than 150 μm), and foamed nickel are placed in a beaker filled with absolute ethanol and ultrasonically dispersed for 5 minutes to obtain foamed nickel filled with ferromagnetic alloy powder, which is an electrolytic anode.

[0080] Step 2: Use nickel foam filled with alloy powder as the anode (the pore size of the pores in the foam nickel is less than or equal to 200 μm), and the stainless steel cylinder as the cathode, and put it into the electrolyte to electrolyze the electrolytic anode to separate the second phase from the iron matrix , using a magnet for magnetic separation to obtain an electrolyte solution containing the second phase. The electrolyte used is: 2% tetramethylammonium chloride, 3% cetyltrimethylammonium chloride, 15% acetylacetone, 5% ...

Embodiment 3

[0087] Embodiment 3: Fe-14Cr-3W-0.4Ti-5Y 2 o3 (wt.%) Second Phase Characterization of Alloy Powders

[0088] Step 1: Ferromagnetic alloy powder (Fe-14Cr-3W-0.4Ti-5Y 2 o 3 (wt.%) alloy powder, the particle size is less than 150 μm), and foamed nickel are put together into a beaker filled with absolute ethanol for ultrasonic dispersion for 3 minutes to obtain foamed nickel filled with ferromagnetic alloy powder, which is an electrolytic anode.

[0089] Step 2: Use nickel foam filled with alloy powder as the anode (the pore size of the pores in the foam nickel is less than or equal to 200 μm), and the stainless steel cylinder as the cathode, and put it into the electrolyte to electrolyze the electrolytic anode to separate the second phase from the iron matrix , using a magnet for magnetic separation to obtain an electrolyte solution containing the second phase. The electrolyte used is: 2% tetramethylammonium chloride, 15% acetylacetone, 3% glycerol, and the balance is absolute...

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Abstract

The invention discloses a method for characterizing a second phase of ferromagnetic alloy powder. The method comprises the following steps: with foamed nickel or nickel mesh filled with ferromagneticpowder as an anode, separating the second phase of the ferromagnetic alloy powder from a powder matrix through electrolysis to obtain an electrolyte containing the second phase; then, performing magnetic separation, diluting by using absolute ethanol and performing ultrasonic dispersion, then dripping onto an ultra-thin carbon supporting membrane and drying to prepare a TEM detection sample; then,performing structural observation and characterization by using a TEM. By the method, the morphology, the structure, the size and other characteristics of the second phase smaller than 0.5[mu]n, especially the second phase with the size being smaller than 50nm, in the ferromagnetic alloy powder can be characterized; the second phase obtained through separation retains the original structure; themethod is simple and high in efficiency; an electrolysis condition is easy to obtain; the repeatability is strong; the method can applied to analysis and characterization of the second phases of various powdery materials.

Description

technical field [0001] The invention relates to a second phase characterization method of ferromagnetic alloy powder, which belongs to the field of metal materials and structure characterization. Background technique [0002] As a raw material for preparing high-performance alloys, alloy powder plays a decisive role in the microstructure and properties of powder-formed samples. Among them, the microstructure of alloy powder, especially the morphology, size and structure of the second phase in alloy powder, is the main parameter to measure the excellent performance of alloy powder. At present, the characterization of the microstructure of alloy powders mainly uses optical microscopes and scanning electron microscopes for low-magnification observations, and the nanoscale second phases cannot be observed by the above two methods. [0003] In order to further characterize the submicron and nanometer-sized second phases in the alloy powder, it is necessary to use transmission el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2202
CPCG01N23/2202
Inventor 刘祖铭李全黄伯云吕学谦彭凯赵凡魏冰
Owner CENT SOUTH UNIV
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