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The main purpose and performance of spherical silica fume

wallpapers Industry 2021-03-23
Why spheroidize?
First of all, the surface of the ball has good fluidity, which is uniformly mixed with the resin to form a film. The amount of resin added is small, and the fluidity is the best. The filling amount of the powder can reach the highest, and the weight ratio can reach 90.5%. Therefore, spheroidization means silicon micropowder With the increase of the filling rate, the higher the filling rate of silicon micropowder, the smaller the thermal expansion coefficient and the lower the thermal conductivity, and the closer to the thermal expansion coefficient of monocrystalline silicon, the better the performance of electronic components produced therefrom. Secondly, the spheroidized molding compound has the least stress concentration and the highest strength. When the stress concentration of the angular powder is 1, the stress of the spherical powder is only 0.6. Therefore, when the spherical powder molding compound encapsulates the integrated circuit chip, the yield rate High, and it is not easy to produce mechanical damage during transportation, installation and use. Third, the friction coefficient of spherical powder is small, and the wear on the mold is small, so that the service life of the mold is long, the cost is reduced, and the economic benefit is improved.
How to produce spherical silica fume?
Spherical silicon powder is mainly used in the packaging of large-scale and very large-scale integrated circuits. According to the degree of integration (the number of standard components per integrated circuit), it is determined whether or not spherical silicon powder is used.
Generally, integrated circuits are engraved on monocrystalline silicon wafers by photolithography, and then connected to the connecting leads and tube corners, and then packaged with epoxy molding compound. The closer the thermal expansion rate of the molding compound is to that of monocrystalline silicon, the better the thermal stability of the integrated circuit. As long as the purity of spherical quartz powder can meet the requirements, natural crystalline quartz is the best raw material, and its production cost is the lowest, and the process route is simpler.

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