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; 2) The process of preparing spherical powder with metal core-shell structure, such as temperature and cooling rate are difficult to control, and the cooling history of metal particles is inconsistent; 3) The particle size distribution is wide, and it is difficult to prepare a core-shell structure with a particle size of less than 20 microns Composite Metal Powder

Method used

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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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Effect test

Embodiment 1

[0036] Preparation of core-shell structure iron / copper composite metal micron spherical powder. Using metal oxides as raw materials, weigh copper oxide and ferric oxide powder according to the atomic percentage of the required copper ferrite component (Cu:Fe=1:2), mix them uniformly and press them into tablets, anneal at 800°C for 6 Hours, then mechanically grind and homogenize, press into tablets, and anneal at 800°C for 3 hours to obtain uniform copper ferrite. Take 2 grams of copper ferrite flakes, mechanically crush them to a powder with a size of about 20 microns, mix the copper ferrite powder with graphite powder with a size of about 400nm in a mass ratio of 1:1, mechanically stir, and mix evenly again .

[0037] Put the above-mentioned mixed copper-ferrite iron powder / graphite powder mixed powder into an alumina crucible, put the crucible into the heating zone of the annealing furnace, and evacuate to 6×10 -3 Pa, introduce 0.01Mpa hydrogen and 0.03Mpa argon, heat to 8...

Embodiment 2

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

[0041]Using metal salts as raw materials, weigh copper acetate and ferric chloride according to the required atomic percentage of copper and iron (Cu:Fe=1:1), dissolve them in deionized water, and keep stirring. During the stirring process, excessive potassium hydroxide solution was gradually added dropwise, and the mixed solution of copper acetate and ferric chloride gradually became turbid, and the reaction produced copper and iron hydroxide precipitates. The precipitate was filtered, washed with plenty of deionized water to remove other ions and impurities, and dried. Grind the dried ferric hydroxide and copper hydroxide precipitates into fine powder, and mix them evenly with 400nm graphite powder.

[0042] The above-mentioned mixed powder of ferric hydroxide, copper hydroxide and graphite was put into an alumina crucible, and the steps described in Example 1 were followed. T...

Embodiment 3

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

[0045] Using silver acetate and iron nitrate as raw materials, weigh iron nitrate and silver acetate according to the atomic percentage of iron and silver (Fe:Ag=2:1), heat and stir in deionized water to prepare a mixture of silver acetate and iron nitrate solution. During the stirring process, excess potassium hydroxide solution is gradually added dropwise, and the reaction produces iron and silver precipitated powder. The precipitate was filtered, washed with plenty of deionized water to remove other ions and impurities, and dried. Grind the dried ferric hydroxide and silver oxide precipitates into fine powder, and mix them evenly with 400nm graphite powder.

[0046] Put the above-mentioned mixed powder of ferric hydroxide and silver oxide powder / graphite powder into an alumina crucible. Put the crucible into the heating zone of the annealing furnace, and evacuate to 6×10 -3...

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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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