Nano Copper

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The metal nano copper refers to a metal powder material in which a metallic copper elemental powder is a main component. Metal copper powder is an important raw material for powder metallurgy. It is mainly used in copper-based friction materials, electric carbon products, oil-impregnated bearings, electrical contact alloys, chip capacitors, chemical or sintered mechanical parts, etc. in aviation, automotive, defense, military, It has a wide range of applications in industries such as electronics. In general, the higher the sphericity of the metal particles, the smaller the specific surface area, and the less the number of atoms present on the surface (ie, the less active atoms), the better the oxidation resistance of the metal particles; on the other hand, the metal particles The smaller the particle size, the larger the surface area and the worse the oxidation resistance.

Generally, methods for preparing metallic copper powder and copper alloy powder include a vapor phase method, a liquid phase method, and a mechanical pulverization method. The preparation of metallic copper powder by gas phase method means that under the vacuum condition, the metal copper organic compound is decomposed to form a copper atom, and the copper atom is reaggregated into a metallic copper powder. In the process of preparing copper metal powder by gas phase method, it is easier to obtain spherical granular metal copper powder due to the surface tension, and the prepared metal copper powder has a narrow particle size distribution range, controllable particle size and oxidation resistance. The capacity is high, but due to the high requirements of the gas phase process equipment, the reaction needs to be carried out under certain vacuum conditions, so it is expensive. The liquid phase method mainly uses a reducing agent to reduce metallic copper ions to metallic copper. Although the method has a low price, the prepared metal particles have a small particle size, an uneven particle size distribution, a large specific surface area, and poor oxidation resistance. The mechanical pulverization method is to prepare the preliminary powder prepared in advance, and pulverize the large particles into small particles by a mechanical method such as ball milling. The metal powder prepared by this method has extremely regular morphology and a large particle size.

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