A kind of growth method of red aluminum oxide gem single crystal

Abstract

The invention discloses a method for growing a red alumina gemstone single crystal. Firstly, aluminum oxide and a chromogenic agent, chromium oxide or chromium carbonate, are pre-melted into a uniformly mixed billet, and then the billet is put into a crucible in a growth chamber. Argon is used as a protective gas. According to the physical and chemical properties of chromium oxide or chromium carbonate, the atmosphere of the growth chamber and the specific voltage drop rate are determined. After the basic process of the Kyropoulos method, red alumina gemstone crystals are finally obtained. The method of the invention can avoid the volatilization of the chromogen chromium oxide or chromium carbonate, effectively reduce the loss of the chromogen and the pollution to the growth cavity, improve the quality of the red alumina gemstone single crystal, and reduce the production cost.

Description

technical field [0001] The invention relates to a single crystal growth method, in particular to a red alumina gemstone single crystal growth method. Background technique [0002] In the prior art, there are many methods for growing single crystals of red alumina gemstones, such as flame method, hydrothermal method, kyropoulos method, etc. Among them, the flame method is currently the most commonly used method for growing alumina gemstones, but due to the temperature of the method The gradient is very large, which is not suitable for growing large-sized gemstone crystals, and there is a lot of thermal stress in the gemstone crystals grown by this method, which is easy to cause crystal cracking in the later stage of growth; gemstone crystals grown by hydrothermal method are currently artificial The quality of gem crystals is the best, but the shortcomings of this method are also obvious. This method grows slowly and is not suitable for large-scale industrial production method...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, there are many methods for growing single crystals of red alumina gemstones, such as flame method, hydrothermal method, kyropoulos method, etc. Among them, the flame method is currently the most commonly used method for growing alumina gemstones, but due to the temperature of the method The gradient is very large, which is not suitable for growing large-sized gemstone crystals, and there is a lot of thermal stress in the gemstone crystals grown by this method, which is easy to cause crystal cracking in the later stage of growth; gemstone crystals grown by hydrothermal method are currently artificial The quality of gem crystals is the best, but the shortcomings of this method are also obvious. This method grows slowly and is not suitable for large-scale industrial production methods; the Kyroplasty method can grow large-sized alumina gem single crystals, and the grown crystals have a large diameter. The quality is good, and it is a relatively mature method for growing large-sized alumina gemstone single crystals at present. However, no matter which method is used, when growing red alumina gemstone single crystals, alumina and chromogen are put into the growth furnace furnace respectively. The chromogen is volatilized during the melting process, and the chromogen cannot be effectively and reasonably utilized, causing certain pollution to the growth chamber in the growth furnace, seriously affecting the quality of the red alumina gemstone single crystal, and increasing the production cost