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Laminar crystallized copper powder and preparation method thereof

A technology of flake crystal and copper powder, which is applied in the field of flake crystal copper powder and its preparation, can solve the problems of non-compliance with environmental protection requirements and poor repeatability, and achieve the effect of smooth surface, simple preparation process and environmental friendliness

Inactive Publication Date: 2007-05-16
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 and well-developed, but the repeatability of this method is poor, and the proportion of flaky particles in the powder strongly depends on the quality of the reaction starting material cuprous oxide. The hydrazine hydrate is used as the reaction raw material, which does not meet the requirements of environmental protection

Method used

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  • Laminar crystallized copper powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 0.25 g of gum arabic in 70 ml of deionized water, add 3.6 g of cuprous bromide, stir and disperse evenly, heat up to 50°C, and then add 1.0 ml of 28% ammonia water. Dissolve 4.8g of ascorbic acid in 30ml of water and heat to 50°C. This reducing solution was added to the above cuprous bromide dispersion. After reacting for 0.5 hours, an aqueous ammonia solution (3 ml of ammonia water mixed with 17 ml of deionized water) was added dropwise. After reacting for 3 hours, the copper powder was centrifuged, washed repeatedly with deionized water and then with ethanol, and finally vacuum-dried at 40°C. Observation of the prepared copper powder with a scanning electron microscope, the results are shown in Figure 1. It can be seen that most of the copper powder is flake-like particles, in the shape of triangular or hexagonal flakes, with a diameter distribution of 1-5 μm and a thickness of 0.1 μm. ~0.2μm, particle aspect ratio between 10~30.

Embodiment 2

[0025] Dissolve 0.25 g of gum arabic in 70 ml of deionized water, add 3.6 g of cuprous bromide, stir and disperse evenly, heat up to 50°C, and then add 2.0 ml of 28% ammonia water. Dissolve 4.8g of ascorbic acid in 30ml of water and heat to 50°C. This reducing solution was added to the above cuprous bromide dispersion. After reacting for 0.5 hours, an aqueous ammonia solution (2 ml of ammonia water mixed with 18 ml of deionized water) was added dropwise. After reacting for 3 hours, the copper powder was centrifuged, washed repeatedly with deionized water and then with ethanol, and finally vacuum-dried at 40°C. Observation of the prepared copper powder by scanning electron microscope shows that most of the copper powder is flaky particles in the shape of triangular or hexagonal flakes with a diameter distribution of 0.5-2.5 μm and a very thin thickness.

Embodiment 3

[0027] Dissolve 0.25 g of gum arabic in 70 ml of deionized water, add 3.6 g of cuprous bromide, stir to disperse evenly, and heat up to 50°C. Dissolve 4.8g of ascorbic acid in 30ml of water, heat to 50°C, and add this reducing solution to the above cuprous bromide dispersion. After reacting for 0.5 hours, an aqueous ammonia solution (4 ml of ammonia water mixed with 16 ml of deionized water) was added dropwise. After reacting for 3 hours, the copper powder was centrifuged, washed repeatedly with deionized water and then with ethanol, and finally vacuum-dried at 40°C. Observing the prepared copper powder with a scanning electron microscope, it can be seen that most of the copper powder is flaky particles, and the particle size is polarized, with a small amount of large particles, with a diameter distribution of 2.0-3.5 μm and a thickness of 0.2-0.5; The particle diameter is 0.5-1.0 μm.

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Abstract

The invention relates to a sheet crystal copper powder, wherein its production comprises (1), adding disperser and ammonia I into reactant copper bromide suspension, to be mixed with reducer solution, and reacted at 40-70Deg. C; after 0.5h, adding ammonia II, reacting for 1-4h; the obtained copper powder is well grown crystal powder, with flat surface and sheet shape, whose diameter is 0.5-10mcirometer, thickness is 0.1-0.8micrometer and the length-width ratio of particle is 5-30.

Description

technical field [0001] The invention relates to copper powder and a preparation method thereof, in particular to a well-developed flaky crystal copper powder and a preparation method thereof. Background technique [0002] Flake 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 electronics manufacturing industry. The preparation of flake copper powder is the most commonly used ball milling method, that is, spherical powder is used as raw material, and the spherical copper powder is crushed by a pulverizer such as a ball mill or a sand mill to make it plastically deformed into a flat shape. This method has simple equipment and low cost, but impurities are easily brought in during the ball milling process, and the obtained copper powder is scaly or flat, with wide particle size and thickness distribution and uneven ...

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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