ZhenAn Metal Silicon Powder Manufacturer introduces the use and characteristics of metal silicon powder
Metal silicon powder manufacturers introduce that metal silicon powder is mainly produced by carbon thermal lithium aluminum hydride in a heating furnace. When in use, it generally discharges molten silicon from the heating furnace and casts it into relatively large pieces, such as pouring it into a cast iron mold. Let's take a look at the detailed introduction of the use and characteristics of metal silicon powder?
ZhenAn Metal Silicon Powder Manufacturer introduces that it should be understood that a large part of the use of metal silicon powder is used in powder form. In this case, the silicon blocks or silicon particles need to be mechanically dissolved, and then they are ground into metal silicon powder with a predetermined particle size distribution and the required chemical composition. However, this method has many disadvantages. Because during the casting process, the cooling rate of the molten silicon must be relatively slow. Therefore, if the alloy components introduced into the silicon melt and the residues contained in the silicon melt are used during the casting process, the shrinkage tendency is stronger and the crystals of solid silicon will be coarser. Because of the shrinkage and coarse primary and secondary crystals, customers can obtain uneven powder products during the mechanical crushing and grinding of steel castings, which is not suitable for many applications of metal silicon powder. Therefore, we should pay more attention when using it. In addition, metal oxides, cementite, nitrogen compounds and carbonitrides will be produced during the use of metal silicon powder. Even a small amount of these substances is undesirable. During the crushing and grinding process, silicon is contaminated by iron due to the wear of the crushing and grinding machines.
When the silicon block is crushed and ground, the fracture surface of the silicon particles can be oxidized by air, causing the surface of each silicon particle in the obtained metal silicon powder to form an unwanted oxide layer. The crushing and grinding process also causes environmental pollution problems in the form of noise and dust, thereby generating internal stress. Therefore, it is necessary to provide a method for continuously converting the molten silicon flowing out of the electric furnace into metal silicon powder. As far as we know, there are many general methods for producing metal silicon powder, such as rare gas atomization, liquid atomization, fast wheel atomization, etc. But we have seen that the methods of producing metal powder are all intermittent, and a certain amount of metal materials are needed to melt and atomize, so it is economical. Because this method needs to be basic, it is possible to continuously turn the molten metal discharged from the melting furnace into silicon slag directly, and there is no available gas atomization silicon method. Although the use of metal silicon powder is very wide, the areas that should be paid attention to cannot be ignored. In short, it is particularly suitable for the production of organic chlorosilanes, and the method is to react silicon slag with methyl chloride or aromatic chlorine to form chlorochlorosilanes.
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