Method for preparing aluminum nano-powder

Abstract

The invention provides a method for preparing aluminum nanometer powder and pertains to the technical field of nanometer material preparation. When the existing method is adopted for preparing aluminum nanometer powder, impurity can be introduced easily, the period is long, and the uniformity of size distribution of the product is bad. The steps of the method provided by the invention are as follows: 1) the raw material of aluminum bar casting is put in an evaporation chamber of direct current hydrogen arc evaporation equipment, the evaporation chamber and a collection chamber are vacuumized to less than 10<-2>Pa, the mixed gas of H2 and He with the pressure ratio of 1:2-3.5 is charged, and a cooling water circulation system is opened; 2) the striking current of the direct current hydrogen arc evaporation equipment is set as 150-200A, continual material supply of the raw material of aluminum bar casting is carried out at the speed of 30-50g / h, and the aluminum nanometer powder is generated in the evaporation chamber; 3) the aluminum nanometer powder is transmitted to the collection chamber under the action of a high-energy fan and collected in a hold-up vessel, and the hold-up vessel is stored in a glove box of inert gases protection. The aluminum nanometer powder prepared by the method has high purity, the particle diameter is smaller and the distribution is even.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, and in particular relates to a method for preparing aluminum nanometer powder with uniform particle size distribution. Background technique [0002] Aluminum and aluminum alloys have low density, high plasticity, and excellent electrical conductivity, thermal conductivity, and corrosion resistance. Therefore, they are not only widely used in military industry, agriculture, light industry, and transportation, but also widely used as building structural materials, family life, etc. Utensils and sporting goods. In addition, aluminum is often used as an additive to effectively improve the mechanical properties or functional properties of materials. However, for aluminum nanomaterials, especially aluminum nanopowders, because of their strong chemical activity, the requirements for preparation equipment conditions and technical routes are very harsh. At present, the preparation...

AI Technical Summary

Problems solved by technology

At present, the preparation methods of pure aluminum nanopowder mainly include mechanical ball milling method, inert gas evaporation-condensation method, electrolytic deposition method, etc. Certain limitations, such as: the mechanical ball milling method often requires tens to hundreds of hours of high-energy ball milling, the average particle size of the prepared powder particles is generally large, the size distribution of the powder particles is wide, and the dispersion and uniformity are poor. And it is easy to introduce impurities such as C, Cr, O, etc.; the inert gas evaporation-condensation method has a strong selectivity to the metal material system, and the powder yield when preparing aluminum nanopowder is very low, which is difficult to meet the actual needs; the electrolytic deposition method is relatively successful. Applied to the preparation of thin film materials, but it is difficult to achieve controllable particle size and uniform particle size distribution when preparing nanopowder materials

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