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Sub-micron spherical silica powder preparation technology and its latest development

wallpapers Products 2021-03-23
With the rapid development of the global electronic information industry and the continuous improvement of 4G, 5G and other technologies, higher technical requirements have been put forward for the lightness, thinness and shortness of electronic products, the packaging performance of the chip and the carrier board for carrying the chip. The spherical silicon micropowder is also moving towards In the direction of small particle size and excellent performance, micron-sized spherical silica powder can no longer meet the existing requirements.
 
Sub-micron spherical silica powder has the advantages of small particle size, proper particle size distribution, high purity, smooth surface and no agglomeration between particles, which can make up for the shortcomings of micron spherical silica powder. At present, there are mainly the following methods for preparing sub-micron spherical silicon powder at home and abroad:
 
Gas phase method
The gas phase method uses silhalane as a raw material, and is hydrolyzed under high temperature conditions to prepare ultrafine spherical silica powder. The hydrolyzed silica molecules agglomerate with each other to form spherical particles. These particles collide and fuse to form aggregates, and these aggregates aggregate to form spherical powders.
The products prepared by this method have high content of impurities such as HCl and low pH, and cannot be used as main materials in electronic products. They can only be added in small amounts to adjust viscosity and increase strength. In addition, the raw materials are expensive, the equipment requirements are high, and the technology is more complicated. .
 
Chemical synthesis
The sub-micron spherical silicon powder prepared by chemical synthesis is usually low in density, often contains more pores, resulting in a large specific surface area, and has the disadvantages of unfriendly production process to the environment.
 
Flame method
The raw materials used in the flame method are silicon-source organics, and the safety design requirements of the feed system are stricter and the price of the raw materials is higher, which often results in higher production costs.
 
VMC method
The VMC method is currently the method for preparing actual products for sale. The sub-micron spherical silica powder prepared by using metallic silicon has the characteristics of smooth surface and high amorphous content. However, this method is currently monopolized by Japan and the United States and is strictly blocked. The raw material metal silicon used is easy to form dust deflagration, and there is a greater safety hazard in the production process.

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