A method for preparation of nanoparticles using nano-sanding machines
The solid phase preparation is roughly divided into two methods, chemical method and mechanical method. In the process of preparation by chemical method, there must be a chemical reaction associated with it, and a new substance is formed from the beginning to form the powder, the more important method is the thermal decomposition method.
1. Thermal Decomposition method
Thermal differentiation of the material is solid phase, after differentiation of the policy products for the solid phase, the rest for the gas phase of this type of material prepared mainly with oxalic acid salt, its differentiation temperature is low, most of the gas occurred is CO2 and water vapor. Oxalic acid and a variety of metals can form oxalic acid salts, and these organic acids are easy to purify and obtain. The oxalic acid salts of some metals and their differentiation temperature are shown in table 6-4.
2. Mechanical method
The grinding method belongs to one of the mechanical methods, the basic principle can be detailed in the fourth chapter, but the preparation of nanometer particles by grinding method is different from the general grinding.
Because the fineness of grinding is greatly added, the phenomenon of mechanical force chemistry is more prominent. As a result, the particles obtained by grinding are not the same as the original material structure, will not be pure substances, often nano-intermetallic compounds.
A common method for the preparation of nanoparticles isNano Sand Grinder, it is a large number of more economical methods for the preparation of nanocrystalline powder, many scientific studies indicate that pure metal, terminal solid solute and intermetallic compounds can be made into nano-sand mill nanoparticles, particle scale depends on the ball grinding conditions and material composition. Because the granularity of the prepared product is very fine, so the diameter of the grinding medium is also very small, such as the use of 1mm media grinding ball, can occur l-2um ultra-fine particles, with rotary grinding can be prepared with a particle size of 0.2-1um Al2O3 ultrafine particles. Also such as TI-10%CU (atomic ratio) after the nano-sand mill alloying composition of 6-8nm particles, because Cu in the grain boundary segregation, hindering the growth of particles, so that the nano-grain is very stable.
Nano-sanding Machine according to its processing properties, nano-sanding machine grinding In addition to the precision mechanical finishing processing, but also can be used in roughing. such as some plate, disk-shaped porous parts of the anti-burr processing, some powder die castings before use, the appearance of the elimination of flying edges and dents, such as coarse flat processing, some non-conductive magnetic workpieces (such as cemented carbide, stainless steel and some non-ferrous metal parts, etc.), because the grinder electromagnetic suction cup can not be sucked, The Nano-sanding mill is used to grind the large size of the blank to the residual processing as well as some rough repair work and so on.
In addition to ball mill and nano-sanding machine, there are other grinding machines can also be used for the preparation of ultrafine particles, such as colloidal grinding, airflow grinding and so on.