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A kind of preparation technology of nano tin powder

A preparation process, nano-tin powder technology, applied in nanotechnology and other directions, can solve the problems of high temperature and pressure, difficult to meet the needs of special use occasions, not energy saving and environmental protection, and achieve uniform distribution, low equipment cost, and controllable scale. Effect

Active Publication Date: 2019-02-01
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the production process of tin powder by atomization method is simple and can be operated continuously, it requires high temperature and pressure, and requires continuous cooling water flow, which is not an energy-saving and environmentally friendly production method
Moreover, the powder prepared by this method can only reach the micron level, which is difficult to meet the needs of some special occasions.

Method used

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  • A kind of preparation technology of nano tin powder
  • A kind of preparation technology of nano tin powder
  • A kind of preparation technology of nano tin powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The gallium-based liquid alloy is selected to prepare tin-containing liquid alloy, and the mass percentages of each component are gallium: 60%, purity 99.9%; indium: 25%, purity 99.9%; tin: 15%, purity 99.9%. Choose the vacuum induction melting process, put the ingredients into the melting crucible according to the above ratio, close the hatch, turn on the vacuum pump, when the vacuum degree reaches 5*10 -3 Melting is carried out after Pa is above; the melting temperature is 1000°C, and after holding for 1 minute, turn off the melting switch, wait for the melt to cool down to around room temperature, open the furnace door, take out the crucible, and obtain a tin-containing liquid alloy.

[0048] Such as figure 1As shown, set up the experimental equipment. Use a dropper to draw an appropriate amount of 0.3 mol / L NaOH solution into the water tank, adjust the pH to 12.5-14.5, take out 10 ml of the above prepared tin-containing liquid alloy from the crucible, and drop it i...

Embodiment 2

[0050] The gallium-based liquid alloy is selected to prepare tin-containing liquid alloy, and the mass percentages of each component are gallium: 60%, purity 99.9%; indium: 25%, purity 99.9%; tin: 15%, purity 99.9%. Choose the vacuum induction melting process, put the ingredients into the melting crucible according to the above ratio, close the hatch, turn on the vacuum pump, when the vacuum degree reaches 5*10 -3 Melting is carried out after Pa is above; the melting temperature is 1000°C, and after holding for 1 minute, turn off the melting switch, wait for the melt to cool down to around room temperature, open the furnace door, take out the crucible, and obtain a tin-containing liquid alloy.

[0051] Such as figure 1 As shown, set up the experimental equipment. Use a dropper to draw an appropriate amount of 0.5 mol / L NaOH solution into the water tank, adjust the pH to 12.5-14.5, take out 10 ml of the liquid alloy containing tin prepared above from the crucible, and drop it ...

Embodiment 3

[0053] The gallium-based liquid alloy is selected to prepare tin-containing liquid alloy, and the mass percentages of each component are gallium: 60%, purity 99.9%; indium: 25%, purity 99.9%; tin: 15%, purity 99.9%. Choose the vacuum induction melting process, put the ingredients into the melting crucible according to the above ratio, close the hatch, turn on the vacuum pump, when the vacuum degree reaches 5*10 -3 Melting is carried out after Pa is above; the melting temperature is 1000°C, and after holding for 1 minute, turn off the melting switch, wait for the melt to cool down to around room temperature, open the furnace door, take out the crucible, and obtain a tin-containing liquid alloy.

[0054] Such as figure 1 As shown, set up the experimental equipment. Use a dropper to draw an appropriate amount of 0.7 mol / L NaOH solution into the water tank, adjust the pH to 12.5-14.5, take out 10 ml of the liquid alloy containing tin prepared above from the crucible, and drop it ...

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Abstract

The invention provides a preparing technology for nano tin powder. The preparing technology specifically comprises the following steps that firstly, a liquid alloy base material is taken, the vacuum induction smelting technology is adopted, and a tin-containing liquid alloy is prepared and obtained; secondly, the prepared and obtained tin-containing liquid alloy is taken and placed in an electrolyte solution, the direct current voltage is applied, and a tin-containing electrolyte solution and a liquid alloy obtained after electrolysis treatment are obtained; thirdly, the obtained liquid alloy obtained after electrolysis treatment is recycled, then a tin material is added, after the vacuum induction smelting technology is adopted for remelting, the tin-containing liquid alloy is obtained again and operated in the second step, and repeated utilization is achieved; and fourthly, the obtained tin-containing electrolyte solution is subjected to centrifugal extraction, tin powder is obtained, and after the tin powder is washed, dried and ground, the tin powder with the needed nano scale is obtained. According to the provided preparing technology for the nano tin powder, the obtained tin powder is controllable in nano scale and uniform in distribution, equipment is low in cost, the technology is simple, environment friendliness is achieved, and the preparing technology is expected to be widely popularized.

Description

technical field [0001] The technical field of material preparation of the present invention relates to a preparation process of nano tin powder. Background technique [0002] Tin powder is widely used in powder metallurgy, electric carbon products, diamond tool products, electronic materials, friction materials, spraying materials, welding materials, pharmaceutical chemicals, metallurgical analysis flux and other fields. In addition, nanoscale tin powder is also a very Potential lithium-ion battery anode materials. [0003] At present, the production of metal tin powder adopts gas atomization method, which uses high-speed air flow or water flow to directly crush liquid metal or alloy, and its powder size is generally less than 150 μm. Its basic production process is: ① metal melting, the melting temperature is 50-100 degrees Celsius higher than the melting point of the metal, while the melting point of tin powder is 231.93 degrees Celsius, and the temperature of molten tin ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/00B82Y40/00
CPCB22F9/00B82Y40/00
Inventor 金明江王孟方金学军汪玉冬
Owner SHANGHAI JIAOTONG UNIV
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