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Graphite/metal powder in core-shell structure and its preparing method

A metal core-shell structure technology, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve problems such as corrosion, difficulty in obtaining uniformly dispersed core/shell structure powder, complex process, etc.

Inactive Publication Date: 2007-06-27
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw material price of sol-gel method is relatively expensive, and the production cycle is long; the electroless plating method has pollution problems, the process is complex and difficult to control; the electrodeposition method requires rolling electrolysis equipment, and it is difficult to obtain uniformly dispersed core / shell structure powder; The hydrothermal method has high requirements on equipment and severe corrosion
Although these methods can prepare graphite / metal core / shell structure powders, they are difficult to apply in industrial production due to the above shortcomings.

Method used

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  • Graphite/metal powder in core-shell structure and its preparing method
  • Graphite/metal powder in core-shell structure and its preparing method
  • Graphite/metal powder in core-shell structure and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Graphite / iron core / shell structure powder material with core / shell mass ratio of 1:1

[0040] Prepare 1.786L ferric sulfate solution A with a concentration of 0.5M and ammonium bicarbonate solution B with a concentration of 1.0M, and 10L suspension mother liquor C. The graphite particle content in the suspension mother liquor C is 5g / L, and the polyethylene glycol content is 2mL / L . Pass A and B into C under mechanical stirring at the same time to form a mixed solution D, adjust the flow rate of A to 1mL / L, adjust the flow rate of B to control the pH value at 6.5, and the preparation process involves the reactions of formulas (1) and (3).

[0041] After feeding, the mixed solution D was subjected to solid-liquid separation and repeated washing, and then the obtained filter cake was dried at 60° C. for 12 hours to obtain graphite / iron core / shell precursor powder.

[0042] Precursor powder in N 2 / H 2 Reduction in mixed gas at 800°C for 2 hours, H 2 The flo...

Embodiment 2

[0043] Example 2: Graphite / cobalt core / shell structure powder material with a core / shell mass ratio of 1:0.5

[0044] Prepare 3.178L of 0.2M cobalt nitrate solution A and 0.4M ammonium bicarbonate solution B, and 5L suspension mother solution C respectively, with graphite particle content of 15g / L and polypropylene alcohol content of 5mL / L. Pass A and B simultaneously into C under mechanical stirring to mix solution D, adjust the flow rate of A to 2.5mL / L, adjust the flow rate of B to control the pH value at 8.0, and the preparation process involves the reaction of formula (4).

[0045] After feeding, the mixed solution D was subjected to solid-liquid separation and repeated washing, and then the obtained filter cake was dried at 80° C. for 10 h to obtain a graphite / cobalt core / shell precursor powder.

[0046] Precursor powder in N 2 / H 2 Reduction in mixed gas at 600°C for 2 hours, H 2 The flow rate is 40mL / min, N 2 The flow rate is 160mL / min, and graphite / cobalt core / she...

Embodiment 3

[0047] Embodiment three: the graphite / nickel core / shell structure powder material with a core / shell mass ratio of 1:0.2

[0048] Prepare 4.310L concentration of 0.1M nickel sulfate solution A and 0.2M ammonium bicarbonate solution B, and 5L suspension mother liquor C respectively, the content of graphite particles is 25g / L, and the content of polyethylene glycol is 7.5mL / L. Pass A and B simultaneously into C under mechanical stirring to mix solution D, adjust the flow rate of A to 10mL / L, adjust the flow rate of B to control the pH value at 9.0, and the preparation process involves the reaction of formula (6).

[0049] After feeding, the mixed solution D was subjected to solid-liquid separation and repeated washing, and then the obtained filter cake was dried at 60° C. for 12 hours to obtain graphite / iron-nickel core / shell precursor powder.

[0050] Precursor powder in N 2 / H 2 Reduction in mixed gas at 500°C for 1 hour, H 2 The flow rate is 20mL / min, N 2 The flow rate is ...

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Abstract

The present invention relates to inorganic material, and is especially graphite / metal powder in core-shell structure and its preparation process. The graphite / metal powder in special core-shell structure has graphite as the kernel and metal Fe, Co, Ni or their alloy as the shell. It is prepared through a non-homogeneous precipitation-hot reduction process, in which graphite / metal core-shell structure precursor powder is first prepared through non-homogeneous precipitation and then hot reduced to obtain graphite / metal core-shell structure powder. The present invention has low production cost and high production efficiency.

Description

technical field [0001] The present invention relates to the technical field of inorganic material preparation, especially graphite / iron, graphite / cobalt, graphite / nickel, graphite / iron-nickel, graphite / iron-cobalt, graphite / cobalt-nickel and graphite / iron-cobalt-nickel-core / shell structure powder The material and its preparation method, that is, the above-mentioned graphite / metal-core / shell structure powder material is prepared by a heterogeneous precipitation-thermal reduction method. Background technique [0002] With the progress of society and the development of science and technology, people have higher and higher requirements on the performance of materials, and the miniaturization and compounding of materials have become the trend and trend of new material development. The core / shell structure powder material is a material with a special structure, which can have both the properties of the shell and the core, and may also produce physical and chemical properties diffe...

Claims

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Application Information

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IPC IPC(8): C09C3/06C09C1/46
Inventor 沈湘黔陈栋景茂祥周建新李东红
Owner JIANGSU UNIV
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