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Yuan Lei Xiaknowledge | The difference between different kinds of silicon powder

Release time:

2024-04-24 14:09

Yuan Lei Xiaknowledge | The difference between different kinds of silicon powder

    According to different classification standards, silicon powder is divided into different types, such as according to the use and purity can be divided into ordinary silicon powder, electrical grade silicon powder, electronic grade silicon powder, semiconductor grade silicon powder, etc., according to the crystallization characteristics can be divided into crystalline silicon powder, molten silicon powder, etc. According to the particle morphology, it can be divided into angular silicon powder and spherical silicon powder.

    Let's take a look at the difference between crystalline silica powder, molten silica powder and spherical silica powder.

Crystalline silica powder

The process is simple and the cost is low

    The main raw material of crystalline silicon powder is selected high-quality quartz ore, which is processed by grinding, precision classification and impurity removal processes, which can improve the linear expansion coefficient, electrical properties and other physical properties of downstream products such as copper clad plate. Its advantage is that it starts early, the process is mature and simple, the production hardware requirements are low and the price is relatively cheap, and the performance of various aspects of the copper-clad plate has no small improvement. The main disadvantage is that the improvement of the resin system is not as good as that of spherical silicon powder, which is manifested in that the dispersion, settlement resistance and impact resistance are lower than that of spherical silicon powder, and the coefficient of thermal expansion is higher than that of spherical silicon powder.

Molten silica powder

The cost of better performance is in the middle

    The main raw material of fused silicon powder is selected quartz with high quality crystal structure, which is refined by acid leaching, washing, air drying, high temperature melting, crushing, manual sorting, magnetic separation, ultra-fine crushing, grading and other processes. Compared with crystalline silicon powder, molten silicon powder has the advantages of lower density, hardness, dielectric constant, thermal expansion coefficient, etc., which is especially prominent in the application of high-frequency copper clad plate, which can be used in smart phones, tablet computers, network communication and other industries. Its main disadvantages are high melting temperature and complex process during the preparation process. Although the permittivity is improved, it is still higher than that of crystalline silicon powder, and its production cost is higher than that of crystalline silicon powder.

Spherical silica powder

Good performance and high cost

    Spherical silicon powder refers to the particle individual is spherical, a kind of high strength, high hardness, inert spherical particles, is through high temperature the irregular shape of the selected angular silicon powder particles instant melting to spheroidize under the action of surface tension, after cooling, grading, mixing and other processes into silicon powder. The spherical silicon powder has good fluidity, high filling amount in the resin, low internal stress after making the sheet, dimensional stability, low thermal expansion coefficient, and higher packing density and more uniform stress distribution, so it can increase the fluidity in the filler and reduce viscosity.

    In addition, the spherical silicon powder has a larger specific surface area than the angular silicon powder, which can significantly reduce the linear expansion coefficient of copper clad and epoxy plastic seals, improve the reliability of electronic products, and reduce the wear and tear of equipment and molds during the manufacture of related products. The main disadvantage is that the preparation process is complex and the cost is high.

Silica powder,peculiarity,Molten silica powder,Spherical silica powder

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