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Preparation method of copper crystal whiskers

A copper whisker and copper powder technology, which is applied in the field of copper whisker preparation, can solve the problems of slow whisker growth and few copper whisker preparation methods, and achieve the effects of high repeatability, enhanced performance, or expanded performance

Inactive Publication Date: 2018-09-25
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are relatively few preparation methods for copper whiskers. The chemical solution method has been reported so far. This method requires the use of a large amount of chemical reagents, and the whiskers grow slowly.

Method used

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  • Preparation method of copper crystal whiskers
  • Preparation method of copper crystal whiskers
  • Preparation method of copper crystal whiskers

Examples

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preparation example Construction

[0032] Such as figure 1 As shown, the present embodiment provides a kind of preparation method of copper whisker, and described preparation method comprises:

[0033] Such as figure 1 As shown, first perform step 1) S11, provide a copper substrate, place the copper substrate in a sulfur source solution for a vulcanization reaction, to form copper sulfide on the surface of the copper substrate;

[0034] The copper substrate includes one of the group consisting of copper wire, copper foam, copper foil, copper plate, copper ingot and copper powder.

[0035] The sulfur source solution contains pure thiourea SC(NH 2 ) 2 One of the mixed solutions of solution and thiourea. In this embodiment, the sulfur source solution may be a pure thiourea solution.

[0036] The material of the copper substrate includes simple copper and copper alloy. For example, the copper alloy includes one of the group consisting of red copper, brass, bronze and cupronickel. Preferably, the copper substra...

Embodiment 1

[0048] The present embodiment provides a kind of method for preparing copper whisker on copper wire, specifically comprises:

[0049] 1) Put a 200-micron diameter copper wire into a 5g / L thiourea solution, pour the whole into a reaction kettle for 24 hours at 150°C and vulcanize for 24 hours; take out the copper wire after cooling down, wash it with deionized water, and then dry it.

[0050] 2) Put the dry surface-vulcanized copper wire into the heating area of ​​the quartz tube furnace, vacuumize, feed 200 sccm hydrogen to normal pressure, open the gas outlet of the cavity, and continue to feed 200 sccm hydrogen to maintain the inside of the quartz cavity Atmospheric pressure.

[0051] 3) Heat to 500°C and maintain for 4h.

[0052] 4) Keep the atmosphere unchanged, and the copper wire is covered with whiskers when it reaches room temperature, such as figure 2 As shown in a, the arrows in the figure show copper wires (thickened after vulcanization), and the small-diameter wir...

Embodiment 2

[0054] The present embodiment provides a kind of method for preparing copper whisker on copper powder, comprising:

[0055] 1) Put the copper powder with a diameter of 200 mesh into 5g / L thiourea solution, pour the whole into the reaction kettle for 24 hours at 150°C and vulcanize for 24 hours; after cooling down, take out the copper powder, filter it, wash it with deionized water, and then dry it.

[0056] 2) Put the dry copper powder vulcanized on the surface into the heating area of ​​the quartz tube furnace, evacuate, pass in 200sccm hydrogen to normal pressure, open the gas outlet of the cavity, and continue to pass in 200sccm hydrogen to maintain the inside of the quartz cavity Atmospheric pressure.

[0057] 3) Heat to 500°C and maintain for 4h.

[0058] 4) Keep the atmosphere constant, and get to room temperature to obtain copper whiskers, such as image 3 As shown in a, it can be clearly seen that many copper whiskers over 1mm are grouped together. image 3 b is the...

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Abstract

The invention provides a preparation method of copper crystal whiskers, which comprises the following steps: 1, providing a copper base material, placing the copper base material in sulfur source solution to perform a vulcanization reaction so as to form sulfide of copper on the surface of the copper base material; 2, carrying out cleaning and drying processing on the copper base material of whichthe surface is provided with the sulfide of copper; 3, placing the copper base material of which the surface is provided with the sulfide of copper in reducing atmosphere to perform a reduction reaction so that the copper crystal whiskers grow and form on the surface of the copper base material. The preparation method provided by the invention is high in repeatability, simple and easy to operate,and suitable for scale batch preparation of the copper crystal whiskers. According to the invention, a growth speed and a size of the copper crystal whiskers can be controlled by controlling a degreeof the vulcanization reaction of the copper and a degree of the reduction reaction of the copper. According to the invention, by utilizing different copper base materials, growth of the crystal whiskers on a copper wire, a copper plate, copper powder and the like can be implemented, and performance of the base material is reinforced or expanded.

Description

technical field [0001] The invention belongs to the field of preparation of copper whiskers, in particular to a preparation method of copper whiskers. Background technique [0002] Whiskers are natural or synthetic fibers that grow in the form of single crystals, and their diameters are small, mostly on the order of microns. There are few defects in the whisker, its strength is close to the theoretical value of a complete crystal, and its mechanical strength is equal to the force between adjacent atoms. The highly oriented structure of whiskers not only makes them have high strength, high modulus and high elongation, but also has electrical, optical, magnetic, dielectric and superconducting properties. The strength of whiskers is much higher than that of other chopped fibers, and it is mainly used as a reinforcement of composite materials for the manufacture of high-strength composite materials. [0003] Whiskers can be divided into two categories: organic whiskers and ino...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/02C30B1/00
CPCC30B1/00C30B29/02C30B29/62
Inventor 张燕辉于广辉陈志蓥隋妍萍
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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