Exploring the processing flow of sapphire mirror

The current watch uses a sapphire mirror to remove aluminum oxide and other impurities such as titanium oxide. The synthetic sapphire is not much different from the natural crystal. The aluminum oxide is made of pure alumina under high temperature conditions. Into the original synthetic sapphire, after several processes, it is finally cut into discs by diamond tools, and then polished to become the mirror of the watch. Because of the high cost and high cost of processing tools, the cost of making sapphire crystals is relatively high. The technique of synthetic sapphire was invented in the 19th century, and has been applied to watches in the 1960s. Today's top watch brands generally use sapphire as a mirror. The synthetic sapphire processing procedure is as follows:
1. First, the raw materials will be decomposed into clean crystal components at a high temperature of 1200 °C. 2. After decomposing, a bucket of pure white and flawless crystal raw materials.
3. Continue to burn the crystal strips required at 2050 °C. 4. Uncut whole piece of crystal.
5. The crystal strips after firing must be manually screened again. Each piece is clean and flawless through the screened crystal strips.
6. A piece of crystal glass to be finished after cutting the crystal strip with a diamond tool. 7. After cutting, the grinder will be used to start grinding the surface at a low speed. This work must be carried out more than 4 times to achieve a bright and transparent mirror effect.
8. Finally, send it to the clean room and then optically process it, and apply special optical media to both sides of the mirror at a high temperature of 280 °C.
Whether it's natural sapphire or synthetic sapphire, the hardness is up to Mohs 9 - there is no harder thing in nature except diamonds. Note that what is said here is not in nature, not that it is not on earth. Some artificial silicon-carbon compounds can also reach hardness 9 and can also scratch sapphire. Many construction and decoration materials also use silicon-carbon compounds, such as artificial stone, etc., so if friction occurs in these places, it is possible to leave scratches on the sapphire crystal.

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