Manufacturing method of micrometer and nanometer composite spherical metal powder of core-shell structure

A core-shell structure, composite metal technology, applied in the field of core-shell structure micro- and nano-composite metal spherical powder manufacturing, can solve the problems of inconsistent cooling history of metal particles, difficult to control temperature and cooling rate, wide particle size distribution, etc. The effect of clear principle, high sphericity and low manufacturing cost

Active Publication Date: 2015-05-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the core-shell structure composite metal prepared by the above patent also has some problems: 1) There are specific restrictions on the series of composite metal materials, which require the composite metal to dissolve at high temperature in the liquid phase, and there is phase separation into two immiscible phases during the cooling process. Liquid phase

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  • Manufacturing method of micrometer and nanometer composite spherical metal powder of core-shell structure
  • Manufacturing method of micrometer and nanometer composite spherical metal powder of core-shell structure
  • Manufacturing method of micrometer and nanometer composite spherical metal powder of core-shell structure

Examples

Experimental program
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Example Embodiment

[0035] Example 1

[0036] Preparation of core-shell structured iron / copper composite metal micron spherical powder. Using metal oxides as raw materials, weigh the copper oxide and ferric oxide powders according to the atomic percentage of the required copper ferrite components (Cu:Fe=1:2), mix them uniformly, and press them, then annealing at 800℃6 After hours, mechanical grinding is homogenized and then pressed into tablets, annealed at 800°C for 3 hours to obtain uniform copper ferrite. Take 2 grams of copper ferrite flakes, mechanically crush it to a powder with a size of about 20 microns, and mix the copper ferrite powder with graphite powder with a size of about 400nm in a ratio of 1:1 by mass, mechanically stirring, and mixing again. .

[0037] Put the mixed powder of the above-mentioned mixed copper ferrite iron powder / graphite powder into an alumina crucible, put the crucible into the heating zone of the annealing furnace, and evacuate to 6×10 -3 Pa, pass in 0.01Mpa of hy...

Example Embodiment

[0039] Example 2

[0040] Preparation of core-shell structured iron / copper composite metal micron spherical powder.

[0041] Using metal salt as raw material, weigh copper acetate and ferric chloride according to the required atomic percentage of copper and iron (Cu:Fe=1:1), dissolve in deionized water, and continue to stir. During the stirring process, an excessive amount of potassium hydroxide solution was gradually added dropwise, and the mixed solution of copper acetate and ferric chloride gradually became turbid and reacted to form copper and iron hydroxide precipitates. The precipitate is filtered, washed with a large amount of deionized water to remove other ions and impurities, and then dried. The dried iron hydroxide and copper hydroxide are precipitated and ground into fine powder, and mixed with 400nm graphite powder uniformly.

[0042] The mixed powder of iron hydroxide, copper hydroxide, and graphite was put into an alumina crucible, and the operation was performed acc...

Example Embodiment

[0043] Example 3

[0044] Preparation of core-shell structured iron / silver composite metal micron spherical powder.

[0045] Using silver acetate and ferric nitrate as raw materials, ferric nitrate and silver acetate are weighed according to the atomic percentage of iron and silver (Fe:Ag=2:1), heated and stirred in deionized water to prepare a mixture of silver acetate and ferric nitrate Solution. During the stirring process, an excessive amount of potassium hydroxide solution was gradually added dropwise to react to produce iron and silver precipitated powder. The precipitate is filtered, washed with a large amount of deionized water to remove other ions and impurities, and then dried. The dried iron hydroxide and silver oxide precipitates are ground into fine powder, and mixed with 400nm graphite powder uniformly.

[0046] The mixed powder of the above-mentioned mixed iron hydroxide and silver oxide powder / graphite powder is put into an alumina crucible. Put the crucible into ...

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Abstract

The invention provides a manufacturing method of micrometer and nanometer composite spherical metal powder of a core-shell structure. The manufacturing method comprises the steps that 1, a composite metal powder precursor is prepared; 2, the prepared composite metal powder precursor is evenly mixed with carbon material powder or ceramic material powder; 3, one or more kinds of metal in the composite metal precursor is molten through high-temperature treatment, after solidification, composite metal spheres of a core-shell structure are formed, wherein the temperature of high-temperature treatment at least reaches the melting temperature of one kind of metal in the composite metal precursor, and particularly the temperature is 400-1000 DEG C higher than the melting point of the kind of metal; 4, the carbon material powder or the ceramic material powder are removed, so that the micrometer and nanometer composite spherical metal powder of the core-shell structure is formed. The size of the composite metal powder precursor is smaller than 10 mm, and the optimal size of the composite metal powder precursor ranges from 50 nm to 1 mm. The degree of sphericity of composite metal spheres of the core-shell structure is high, and the composite metal spheres of the core-shell structure can be widely applied to powder metallurgy and conductive slurry.

Description

technical field [0001] The invention relates to a wide range of applications in the fields of powder metallurgy, conductive paste, hard alloy, magnetic material, sensing, optics, catalysis and the like. Background technique [0002] Core-shell metal particles are composite particles composed of two or more metals with different properties, generally consisting of a central core and an outer shell. Compared with single metal particles, core-shell metal particles have unique structural characteristics. It integrates the properties of the two materials inside and outside, and complements each other's deficiencies. It is an important research direction in recent years that shape determines properties. Because the structure and composition of core-shell composite particles can be designed and tailored, they have many unique physical and chemical properties, such as optical, electrical, magnetic, mechanical, and catalytic, which are different from those of single-component particl...

Claims

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Application Information

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IPC IPC(8): B22F1/02B82Y40/00B82Y30/00
CPCB22F9/06B82Y30/00
Inventor 唐少龙黄海富雷成龙程振之都有为
Owner NANJING UNIV
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