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Magnetic separation method of paramagnetic phase and ferromagnetic phase in nano FeNi powder body

A nano-powder and magnetic separation technology, applied in the field of magnetic separation, can solve problems that have not yet been discovered, the influence of grain size, and the limitation of chemical composition.

Inactive Publication Date: 2004-02-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] After literature search, it was found that Kaloshkin et al. in "Mechanically alloyed low-nickelaustenite Fe-Ni phase: evidence of single-phase paramagnetic state" (Mechanically alloyed low-nickel austenite FeNi phase: Evidence of single-phase paramagnetic state), Journal of Non-CrystallineSolids, 287, 329 (2001) introduced that a single fcc structure paramagnetic phase FeNi nano-alloy can be obtained by heat treatment, but the heat treatment process has a great influence on the phase composition and grain size, and is affected by the chemical ingredient restrictions
No reports identical or similar to the subject of the present invention have been found in further searches

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] Embodiment 1: master alloy Fe-16Ni, the mass percentage of Ni is 16%, with inert gas (high purity Ar+H 2 ) evaporative condensation (liquid nitrogen cold trap) method to prepare Fe-12Ni (the mass percent of Ni is 12%) nanopowder (containing fcc and bcc structure), magnetic separation after ultrasonic vibration for 1 hour, x-ray results show that only part of the separation .

Embodiment 2

[0014] Embodiment 2: master alloy Fe-16Ni, the mass percent of Ni is 16%, with inert gas (high purity Ar+H 2 )) evaporative condensation (liquid nitrogen cold trap) method to prepare Fe-12Ni (the mass percentage of Ni is 12%) nanopowder (containing fcc and bcc structure), magnetic separation after ultrasonic vibration for 2 hours, x-ray results show that most Separation, that is, the main fcc powder does not contain bcc powder; while the bcc powder contains a small amount of fcc powder.

Embodiment 3

[0015] Embodiment 3: master alloy Fe-16Ni, the mass percentage of Ni is 16%, with inert gas (high purity Ar+H 2 )) evaporative condensation (liquid nitrogen cold trap) method to prepare Fe-12tNi (the mass percentage of Ni is 12%) nanopowder (containing fcc and bcc structure), the particle size distribution is between 5 and 50 nanometers, after ultrasonic vibration for 3 hours Magnetic separation, X-ray results show complete separation, and the particle size distribution of fcc powder is between 5 and 30 nanometers, and the particle size distribution of bcc powder is between 25 and 50 nanometers.

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Abstract

The magnetic separation method of ferromagnetic phase and paramagnetic phase in nano FeNi powder body includes the following steps: firstly, preparing nano FeNi alloy powder body, mother alloy is prepared FeNi alloy or is Fe and Ni elementary substance, then using ultrasonic wave to breake the agglomeration body in the dispersing agent to make powder body granules be mutually separated, then placing the dispersed granules into magnetic field, and making the granules freely move under the action of magnetic field force by using dispersing agent medium, finally respectively collecting separatedferromagnetic powder body and paramagnetic powder body so as to obtain the required nano powder body.

Description

technical field [0001] The present invention relates to a method for magnetic separation, in particular to a method for magnetic separation of ferromagnetic or paramagnetic phases from mixed nano-FeNi powders of face-centered cubic (fcc) phase and body-centered cubic (bcc) phase , belonging to the field of nanomaterial preparation. Background technique [0002] Nanoscience and nanotechnology are high-tech in the 21st century. Nanomaterials often exhibit different acoustic, magnetic, electrical, thermal, and optical properties from conventional coarse-grained materials, and thus become one of the hotspots of current research in various disciplines. FeNi alloys have excellent magnetic properties and unique mechanical properties, and have been intensively studied and widely used for a long time. In recent years, the preparation and characterization of nano-FeNi alloys have also been frequently reported. At the same time, due to the needs of theoretical research and practical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/00
Inventor 汪宏斌张骥华徐祖耀
Owner SHANGHAI JIAO TONG UNIV