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However, the sapphire processing technology currently has the following problems:
Since sapphire is high in hardness and too brittle, it is very difficult to machine it. Mirror processing technology is more complex and is one of the key research topics today. At present, China's sapphire mirror processing technology has the following deficiencies in mass production:
a. The proportion of missing corners of gemstones during processing is relatively high, accounting for 5% to 8% of the total;
b. After grinding and polishing, the surface of the gemstone sheet is heavily scratched, and about 20% of the surface of the gemstone has thick and deep marks, which need to be re-polished and polished, so that some of the gemstone pieces are thin and waste, and affect the production efficiency;
c. Due to rework and scrap, the processing cost of gemstones is very high, with an average processing cost of 3.5 yuan per piece, which is not competitive in the international market.
The artificially grown sapphire single crystal has the same optical properties and mechanical properties as the natural sapphire. It has high infrared transmittance, good wear resistance, hardness second only to diamond, and good stability at high temperatures. The melting point is 2030 ° C, so it has been increasingly used as a manufacturing material for parts in high-tech fields such as solid-state lasers, infrared windows, substrate sheets for semiconductor chips, precision wear-resistant bearings, etc., and is also made to never wear. The mirror and a variety of exquisite luxury accessories.