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Preparation method of nano copper powder

A technology of nano copper powder and copper oxide powder, which is applied in nanotechnology, metal processing equipment, transportation and packaging, etc., can solve the problems of lack of nano copper powder, difficulty in preparing nano copper powder with uniform particle size, etc. Low content and uniform particle size

Inactive Publication Date: 2017-02-22
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the solution is alkaline, Cu 2+ and Cu + The corresponding hydroxide precipitation must be generated, so the prepared copper powder must contain Cu 2 O; when the solution is acidic, due to the H in the solution + It has the characteristics of inhibiting the nucleation of copper powder and promoting the growth of copper powder, so it is difficult to prepare nano-copper powder with uniform particle size
[0004] It can be seen that although there are many preparation methods for copper powder, there is still no practical method to prepare nano-copper powder with uniform particle size and low oxygen content, and a new preparation method has been developed to obtain nano-copper with better performance. Powder, has positive practical significance and good application prospects

Method used

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  • Preparation method of nano copper powder
  • Preparation method of nano copper powder

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Experimental program
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Embodiment 1

[0021] The preparation of nano-copper powder should be carried out according to the following steps: Accurately weigh 1.00kg of copper oxide powder (CuO) and 1.41kg of calcium oxide powder (CaO) according to the molar ratio of 1:2, and dry-mill in a planetary ball mill for 4h, evenly After mixing, they were placed in a tubular atmosphere furnace and calcined at 950 °C for 3 h under an oxygen atmosphere to obtain calcium cuprate (Ca 2 CuO 3 ) powder; the calcium cuprate powder was heated to 350 °C for 120 min in a hydrogen flow of 1.5 L / min and reduced for 120 min, and then the reduced product was washed four times with a dilute hydrochloric acid solution (10%) containing polyvinylpyrrolidone (PVP), and then used The reduction product was washed three times with absolute ethanol, and the product was dried to obtain nano-copper powder.

Embodiment 2

[0023] To prepare nano-copper powder, the following steps should be followed: Accurately weigh 1.00 kg of copper oxide powder (CuO) and 1.76 kg of calcium oxide powder (CaO) according to the molar ratio of 1:2.5, and dry-mill them in a planetary ball mill for 4 hours. After mixing, put it in a tube atmosphere furnace, and calcined at 950 °C for 3 hours in the atmosphere to obtain calcium cuprate (Ca 2 CuO 3 ) powder; the calcium cuprate powder was heated to 400°C for 120 min in a hydrogen flow of 1.5 L / min and reduced for 120 min, and then the reduced product was washed four times with dilute hydrochloric acid solution (10%) containing polyvinylpyrrolidone (PVP), and then used The reduction product was washed three times with absolute ethanol, and the product was dried to obtain nano-copper powder.

Embodiment 3

[0025] To prepare nano-copper powder, the following steps should be followed: Accurately weigh 1.00kg of copper oxide powder (CuO) and 1.76kg of calcium oxide powder (CaO) according to the molar ratio of 1:2.5, and dry-mill them in a planetary ball mill for 4 hours to evenly After mixing, place it in a tubular atmosphere furnace and calcinate at 1050°C for 3 hours under an argon atmosphere to obtain calcium cuprate (Ca 2 CuO 3 ) powder; the calcium cuprate powder was heated to 450°C for 90 min in a hydrogen flow of 2 L / min and reduced for 90 min, and then the reduced product was washed four times with a dilute hydrochloric acid solution (20%) containing polyethylene glycol (PEG), and then The reduction product was washed three times with absolute ethanol, and the product was dried to obtain nanometer copper powder.

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Abstract

The invention discloses a preparation method of nano copper powder. Copper oxide and calcium oxide powder are made into calcium cuprate powder by mechanical mixing and calcination technologies, then the calcium cuprate powder is reduced in a hydrogen atmosphere, then cleaning with a dilute hydrochloric acid solution is carried out, and the nano copper powder is obtained. The preparation method is simple in technology, the used raw materials are low-cost and are easy to obtain, no special equipment is required in a mixing stage, a calcination stage or a reduction stage, and rapid continuous mass production can be realized. The prepared nano copper powder is uniform in particle size, good in dispersity and low in oxygen content, and the mean particle size of primary particles is around 20 nanometers.

Description

technical field [0001] The invention relates to the preparation of metal functional materials, in particular provides a preparation method of nanometer copper powder, which belongs to the field of metal powder preparation. Background technique [0002] Nano-copper powder has many characteristics such as small particle size, large specific surface area, large number of surface active centers, low resistivity, quantum size effect and macroscopic quantum tunneling effect. Wide application prospects. With the depletion of precious metal resources and the continuous decline in the price of electronic components, it has become a major trend in the development of electronic components to replace precious metals such as silver with copper and other low-priced metals as conductive and thermally conductive materials. It is possible for the material to replace precious metal powder such as ultrafine silver powder in the preparation of electronic paste. [0003] At present, there are ...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F1/00B82Y40/00
CPCB82Y40/00B22F9/22B22F1/054
Inventor 唐建成赵玉超叶楠
Owner NANCHANG UNIV
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