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Sheet crystal cupper powder and liquid phase chemical preparation process thereof

A technology of flaky crystal and copper powder, which is applied in the field of thin flaky crystalline copper powder and its liquid phase chemical preparation, can solve the problems of low proportion of flaky particles and poor thixotropy of slurry, etc., and achieve metal strength and smooth surface , The effect of simple preparation process

Inactive Publication Date: 2006-06-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The flaky copper powder prepared by this method has a smooth surface, but the proportion of flaky particles in the powder is not high, contains a large proportion of spherical particles, the particle size distribution is very wide, and the aspect ratio (average long diameter / average thickness) is small , that is, the copper powder is very thick, and when the thick copper powder is processed into a slurry, the thixotropy of the slurry has significantly deteriorated characteristics

Method used

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  • Sheet crystal cupper powder and liquid phase chemical preparation process thereof
  • Sheet crystal cupper powder and liquid phase chemical preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 0.57 g of glycine and 1.64 g of tetradecyltrimethylammonium bromide in 50 ml of water, add 3.67 g of cuprous oxide, stir evenly, and raise the temperature to 65°C. Dissolve 6.3 g of citric acid and 1.26 g of potassium hydroxide in 11 ml of deionized water to form a buffer solution, add 4.1 ml of 80% hydrazine hydrate solution to the buffer solution, and mix well. The hydrazine hydrate reducing solution was added dropwise into the cuprous oxide dispersion for reaction. After 3 hours of reaction, the copper powder was centrifuged, washed repeatedly with deionized water and then with ethanol, and finally vacuum-dried at 60°C. The obtained copper powder is bright pink and shows obvious metallic luster. The scanning electron microscope observed its appearance as figure 1 As shown, most of the particles are in the shape of triangular, pentagonal and hexagonal flakes, the particle diameter is 1.5-6.5 μm, the width is 0.2-0.4 μm, and the particle aspect ratio is betwe...

Embodiment 2

[0022] Glycine 0.76g and cetyltrimethylammonium bromide 1.78g were dissolved in 50ml of water, and cuprous oxide 3.65g was added to disperse evenly, and the temperature was raised to 55°C. 4 ml of 80% hydrazine hydrate was added to 10 ml of deionized water, and the resulting hydrazine solution was adjusted to pH 8.5 with 1M citric acid / water solution. The reducing solution was added dropwise into the cuprous oxide dispersion at a rate of 0.2 ml / min for reaction. After reacting for 2 hours, the copper powder was centrifuged, washed repeatedly with deionized water and then with ethanol, and finally vacuum-dried at 60°C. The obtained copper powder is bright pink and shows obvious metallic luster. The scanning electron microscope observed its appearance as figure 2 As shown, it can be seen that triangular, pentagonal and flake-shaped particles account for the vast majority, and a small number of polyhedral or spherical particles are mixed. The flake-like particles have a diame...

Embodiment 3

[0024] Glycine 0.91g and dodecyltrimethylammonium chloride 2.64g were dissolved in 50ml of water, 7.10g of cuprous oxide was added to disperse evenly, and the temperature was raised to 60°C. Mix 10ml of 80% hydrazine hydrate with 20ml of 1M citric acid / water solution. Add the reducing solution dropwise into the cuprous oxide dispersion to react for 3 hours. The obtained copper powder is bright pink and shows obvious metallic luster. Observing its morphology with a scanning electron microscope, it can be seen that the diameter of flake particles is 4.0-15 μm, the width is 0.6-1.4 μm, and the aspect ratio of particles is between 6-18.

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Abstract

A liquid-phase chemic method for preparing the flaky-crystal cupper powder from cuprous oxide powder, amino acetic acid or amino propionic acid as promoter and ammonium hexadecane trimethylbromide as disperser through dissolving promoter and disperser in deionized water, adding cuprous oxide powder, stirring, regulating the pH value of reducer (hydrazine) solution, adding it to the dispersed cuprous oxide solution, reaction, separation, washing and drying.

Description

technical field [0001] The invention relates to a preparation method of copper powder, specifically a well-developed flaky crystalline copper powder and a liquid-phase chemical preparation method thereof. Background technique [0002] Copper powder is an important electronic material, which has been used to configure various conductive coatings, conductive adhesives and conductive pastes, and has a wide range of applications in the communication and electronics manufacturing industry. The morphology of copper powder as a conductive filler has a great influence on the conductivity of the conductive material and the properties of the configured conductive paste. For flake copper powder, the accumulation between the particles is not only point contact, but also surface contact. This accumulation method makes the thermal resistance and electrical resistance relatively low, and has excellent thermal and electrical conductivity in a specific directi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 符小艺凌志远
Owner SOUTH CHINA UNIV OF TECH
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