Method of preparing nano powderusing liquid nitrogen low temperature ball mill

Abstract

A process for preparing the nanoparticles with high thermal stability by low-temp ball grinding in liquefied nitrogen features that the micron-class Ni powder and Al powder are ground by stainless steel balls at -110- -160 deg.C for 1-15 hr to obtain their nanoparticles while generate nano-class NOx which can increase the thermal stability of said nanoparticles.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, and in particular provides a method for preparing high thermal stability nanometer powder by liquid nitrogen low-temperature ball milling. It is widely used in the preparation of various nano powder materials. Background technique [0002] The research and application of bulk nanostructure materials is an important direction for the development of nanomaterials, and plays a decisive role in the further development and application of the entire nanomaterial science and technology. Although laboratory research has proved that the performance of nanostructured materials is far superior to that of traditional coarse-grained materials, the transformation of laboratory research results to engineering applications has lagged behind. One of the main obstacles is that there is no breakthrough in the preparation and forming technology of bulk nanomaterials, that is, it is relatively...

AI Technical Summary

Problems solved by technology

However, there are some problems and deficiencies in the use of these technologies, which have become a major obstacle to the practical application of new nanomaterials.

These problems include: (1) The serious problem involved in most preparation techniques is the extremely low productivity

Such low production efficiency leads to extremely high production costs, which seriously limits the feasibility of its application as a nanostructure material; (2) most preparation methods can only synthesize one kind of metal or ceramic nanopowder at a time, but cannot prepare two One or more uniformly mixed nanoparticles limit the application range of nanostructured materials; (3) most preparation techniques require expensive large-scale equipment (such as high-energy lasers or plasma generators, etc.), resulting in high manufacturing costs, which are not conducive to Large-scale industrial application of nanostructured materials; (4) When vapor depositing nanoparticles, it is difficult to accurately control the size and size distribution of the particles, and a wide particle size distribution often occurs, and large particles with a size several times the average particle size appear , which is not conducive to obtaining a uniform nanocrystalline structure, which will cause fluctuations in material properties; (5) Some processes need to use expensive raw materials when synthesizing ceramic powders and may produce harmful gas emissions, which is not conducive to environmental protection

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