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Preparation, characteristics and application of silicon powder

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Update time : 2021-07-09 10:30:06
Silicon Powder, also called micro-Silicon fume, scientific name "Silicon fume", is made by a special trapping device to collect and process the smoke and dust escaping with waste gas during the process of smelting industrial silicon and ferrosilicon at high temperature in an industrial electric furnace. In the escaping smoke and dust, the content of SiO2 accounts for about 90% of the total smoke and dust, the particle size is very small, and the average particle size is almost nanometer level, so it is called Silicon fume.
Performance and use of silicon powder
Silicon powder is finely processed by crushing, purifying, grinding, grading, and other processes using silicon dioxide (SiO2), also known as quartz. It has high purity, white color, and reasonable particle size distribution. It has unique properties and a wide range of uses.
1.Silicon powder performance
(1) Silicon powder has good insulation: due to the high purity of silicon powder, low impurity content, stable performance, and excellent electrical insulation performance, the cured product has good insulation performance and arc resistance.
(2) Silicon powder can reduce the exothermic peak temperature of the curing reaction of epoxy resin, reduce the linear expansion coefficient and shrinkage rate of the cured product, thereby eliminating the internal stress of the cured product and preventing cracking.
(3) Silicon powder has corrosion resistance: Silicon powder is not easy to react with other substances and does not chemically react with most acids and alkalis. Its particles uniformly cover the surface of the object and have strong corrosion resistance.
(4) The gradation of silicon powder particles is reasonable, which can reduce and eliminate precipitation and delamination during use; it can increase the tensile and compressive strength of the cured product, increase the wear resistance, and increase the thermal conductivity of the cured product. Increase flame retardant performance.
(5) Silicon powder treated with silane coupling agent has good wettability to various resins, good adsorption performance, easy to mix, and no agglomeration.
(6) Silicon powder is used as a filler and added to the organic resin, which not only improves the performance of the cured product but also reduces the product cost.
Preparation of silicon powder
There are many methods for preparing silicon powder using silicon blocks as raw materials. Among them, the effect is better and the application is the Raymond method, the roller method, the disc grinding method, and the punching and spinning method. The equipment used is the Raymond method, roller mill, disc mill (also called a vertical mill), and punching and spinning method. In terms of the principle of milling, the first three are extrusion crushing, and the latter are impact crushing. In terms of their structure, they are very different, each with its own characteristics, and each has its own advantages and disadvantages.
TRUNNANO (aka. Luoyang Tongrun Nano Technology Co. Ltd.) is a trusted global chemical material supplier & manufacturer with over 12 years’ experience in providing super high-quality chemicals and Nanomaterials. The silicon powder produced by our company has high purity, fine particle size and impurity content. Please contact us if necessary.
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