Lead: You may not be particularly familiar with high purity graphite craft. In our life, it is basically not our special attention, and few people know it. High purity graphite belongs to high-purity metals and related semiconductors, and graphite will be used in production. In order to further improve the purity of metal materials and semiconductors and reduce the quantity of other materials, high purity graphite with high carbon content and low impurities must be required to meet the requirements. Next, Bian Xiao will promote some production technologies from high purity graphite.

Raw materials control the content of impurities

When producing high purity graphite, manufacturers should strictly control the impurity content in high purity graphite at the beginning of raw material selection. Raw materials with low ash content are the objects of choice, and attention should be paid to the increase of impurities when processing in high purity graphite. This will lay a good foundation for the output of high purity graphite in the later period.

Adopt high temperature to remove impurities.

As mentioned just now, the method of controlling impurities at high temperature can be used to control the increase of impurity content. Under high temperature treatment, the oxides of many impurities in high purity graphite will be continuously evaporated and decomposed. If the temperature is higher, many impurity objects in high purity graphite will be eliminated. Relatively speaking, the purity of high purity graphite has been improved. When manufacturers are producing ordinary high purity graphite, it is hard to imagine that the high temperature of the furnace core is actually 2300 degrees, and the impurity content at this time is about 0. 1% to 0.3%. If the temperature of the furnace core is increased to 2500 to 3000 degrees, the impurities in high purity graphite will be reduced a lot.

Improving current density to extract high purity graphite.

When the temperature in high-purity graphite reaches 3000 degrees, some impurities cannot be removed. The graphite company adopts a new method to extract high-purity graphite by lowering the furnace core temperature and directly increasing the current density. This reduces the output of graphite furnace core, but with the increase of current, the power consumption also increases.

Finally, the high-purity graphite is purified.

In the final purification process, a necessary procedure is to introduce purification gases, such as some freon and chlorine, so that the solid impurities in high purity graphite can be rapidly decomposed. In order to avoid the reverse diffusion of impurities, some nitrogen can be added to remove the residual gas more cleanly.

Summary: The above is the knowledge about production technology in high purity graphite summarized by Bian Xiao, and the process is more rigorous and complicated. I hope interested friends can learn more about it. If you like Bian Xiao's articles, just collect them.