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Why should quartz powder be spherical

wallpapers Tech 2021-01-15
Spherical quartz powder, also known as spherical silica powder, refers to an amorphous quartz powder material whose individual particles are spherical and the main component is silicon dioxide.
 
Spherical quartz powder is mainly used for copper-clad laminates and epoxy plastic packaging materials in large-scale integrated circuit packaging. It is also used in high-tech fields such as aerospace, fine chemicals and daily cosmetics.
 
Why should quartz powder be spherical?
 
(1) The surface area of the ball is the smallest, the isotropy is good, it is uniformly stirred 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, the mass ratio can reach 90.5%, so the serialization It means that the filling rate of silicon powder increases.
 
The higher the filling rate of silicon micro powder, the smaller the thermal expansion coefficient of the molding compound, and the lower the thermal conductivity, the closer the thermal expansion coefficient of monocrystalline silicon, and the better the performance of electronic components produced therefrom.
 
(2) The plastic molding compound made of spherical powder has the smallest stress concentration and the highest strength. When the stress concentration of the angular powder molding compound is 1, the stress of the spherical powder is only 0.6. Therefore, when the spherical powder plastic molding compound encapsulates the integrated circuit chip, the finished product High rate, and it is not easy to produce mechanical damage during transportation, installation and use.
 
(3) 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. Compared with the angular powder, it can double the service life of the mold. The packaging mold of the plastic compound is very expensive, and some need to be imported. This is also very important for the packaging factory to reduce costs and improve economic benefits.
 
(4) Silica powder itself has the function of strengthening epoxy resin, while spherical powder can enhance this function.

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